Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Biased-corrected richness estimates for the Amazonian tree flora
    Steege, Hans ter; Prado, Paulo I. ; Lima, Renato A.F. de; Pos, Edwin ; Souza Coelho, Luiz de; Andrade Lima Filho, Diogenes de; Salomão, Rafael P. ; Amaral, Iêda Leão ; Almeida Matos, Francisca Dionízia de; Castilho, Carolina V. ; Phillips, Oliver L. ; Guevara, Juan Ernesto ; Jesus Veiga Carim, Marcelo de; Cárdenas López, Dairon ; Magnusson, William E. ; Wittmann, Florian ; Martins, Maria Pires ; Sabatier, Daniel ; Irume, Mariana Victória ; Silva Guimarães, José Renan da; Molino, Jean François ; Bánki, Olaf S. ; Piedade, Maria Teresa Fernandez ; Pitman, Nigel C.A. ; Ramos, José Ferreira ; Monteagudo Mendoza, Abel ; Venticinque, Eduardo Martins ; Luize, Bruno Garcia ; Núñez Vargas, Percy ; Silva, Thiago Sanna Freire ; Leão Novo, Evlyn Márcia Moraes de; Reis, Neidiane Farias Costa ; Terborgh, John ; Manzatto, Angelo Gilberto ; Casula, Katia Regina ; Honorio Coronado, Euridice N. ; Montero, Juan Carlos ; Duque, Alvaro ; Costa, Flávia R.C. ; Castaño Arboleda, Nicolás ; Schöngart, Jochen ; Zartman, Charles Eugene ; Killeen, Timothy J. ; Marimon, Beatriz S. ; Marimon-Junior, Ben Hur ; Vasquez, Rodolfo ; Mostacedo, Bonifacio ; Demarchi, Layon O. ; Feldpausch, Ted R. ; Engel, Julien ; Petronelli, Pascal ; Baraloto, Chris ; Assis, Rafael L. ; Castellanos, Hernán ; Simon, Marcelo Fragomeni ; Medeiros, Marcelo Brilhante de; Quaresma, Adriano ; Laurance, Susan G.W. ; Rincón, Lorena M. ; Andrade, Ana ; Sousa, Thaiane R. ; Camargo, José Luís ; Schietti, Juliana ; Laurance, William F. ; Queiroz, Helder Lima de; Nascimento, Henrique Eduardo Mendonça ; Lopes, Maria Aparecida ; Sousa Farias, Emanuelle de; Magalhães, José Leonardo Lima ; Brienen, Roel ; Aymard C, Gerardo A. ; Revilla, Juan David Cardenas ; Vieira, Ima Célia Guimarães ; Cintra, Bruno Barçante Ladvocat ; Stevenson, Pablo R. ; Feitosa, Yuri Oliveira ; Duivenvoorden, Joost F. ; Mogollón, Hugo F. ; Araujo-Murakami, Alejandro ; Ferreira, Leandro Valle ; Lozada, José Rafael ; Comiskey, James A. ; Toledo, José Julio de; Damasco, Gabriel ; Dávila, Nállarett ; Lopes, Aline ; García-Villacorta, Roosevelt ; Draper, Freddie ; Vicentini, Alberto ; Cornejo Valverde, Fernando ; Lloyd, Jon ; Gomes, Vitor H.F. ; Neill, David ; Alonso, Alfonso ; Dallmeier, Francisco ; Souza, Fernanda Coelho de; Maas, Paul ; Baker, Tim R. ; Andel, Tinde R. van; Noronha, Janaína Costa ; Barbosa, Edelcilio Marques ; Malhi, Yadvinder ; Tirado, Milton ; Wang, Ophelia ; Nascimento, Marcelo Trindade ; Flores, Bernardo Monteiro - \ 2020
    Scientific Reports 10 (2020)1. - ISSN 2045-2322

    Amazonian forests are extraordinarily diverse, but the estimated species richness is very much debated. Here, we apply an ensemble of parametric estimators and a novel technique that includes conspecific spatial aggregation to an extended database of forest plots with up-to-date taxonomy. We show that the species abundance distribution of Amazonia is best approximated by a logseries with aggregated individuals, where aggregation increases with rarity. By averaging several methods to estimate total richness, we confirm that over 15,000 tree species are expected to occur in Amazonia. We also show that using ten times the number of plots would result in an increase to just ~50% of those 15,000 estimated species. To get a more complete sample of all tree species, rigorous field campaigns may be needed but the number of trees in Amazonia will remain an estimate for years to come.

    Sympagic Fauna in and Under Arctic Pack Ice in the Annual Sea-Ice System of the New Arctic
    Ehrlich, Julia ; Schaafsma, Fokje L. ; Bluhm, Bodil A. ; Peeken, Ilka ; Castellani, Giulia ; Brandt, Angelika ; Flores, Hauke - \ 2020
    Frontiers in Marine Science 7 (2020). - ISSN 2296-7745 - 20 p.
    Antarctica
    A strong decline and thinning of the Arctic sea-ice cover over the past five decades has been documented. The former multiyear sea-ice system has largely changed to an annual system and with it the dynamics of sea-ice transport across the Arctic Ocean. Less sea ice is reaching the Fram Strait and more ice and ice-transported material is released in the northern Laptev Sea and the central Arctic Ocean. This trend is expected to have a decisive impact on ice associated (“sympagic”) communities. As sympagic fauna plays an important role in transmitting carbon from the ice-water interface to the pelagic and benthic food webs, it is important to monitor its community composition under the changing environmental conditions. We investigated the taxonomic composition, abundance and distribution of sea-ice meiofauna (here heterotrophs >10 μm; eight stations) and under-ice fauna (here metazoans >300 μm; fourteen stations) in Arctic 1.5 year-old pack ice north of Svalbard. Sampling was conducted during spring 2015 by sea-ice coring and trawling with a Surface and Under-Ice Trawl. We identified 42 taxa associated with the sea ice. The total abundance of sea-ice meiofauna ranged between 580 and 17,156 ind.m–2 and was dominated by Ciliophora (46%), Copepoda nauplii (29%), and Harpacticoida (20%). In contrast to earlier studies in this region, we found no Nematoda and few flatworms in our sea-ice samples. Under-ice fauna abundance ranged between 15 and 6,785 ind.m–2 and was dominated by Appendicularia (58%), caused by exceptionally high abundance at one station. Copepoda nauplii (23%), Calanus finmarchicus (9%), and Calanus glacialis (6%) were also very abundant while sympagic Amphipoda were comparatively rare (0.35%). Both sympagic communities showed regional differences in community composition and abundance between shelf and offshore stations, but only for the under-ice fauna those differences were statistically significant. Selected environmental variables moderately explained variations in abundances of both faunas. The results of this study are consistent with predictions of diversity shifts in the new Arctic.
    Long-term thermal sensitivity of Earth's tropical forests
    Sullivan, Martin J.P. ; Lewis, Simon L. ; Affum-Baffoe, Kofi ; Castilho, Carolina ; Costa, Flávia ; Sanchez, Aida Cuni ; Ewango, Corneille E.N. ; Hubau, Wannes ; Marimon, Beatriz ; Monteagudo-Mendoza, Abel ; Qie, Lan ; Sonké, Bonaventure ; Martinez, Rodolfo Vasquez ; Baker, Timothy R. ; Brienen, Roel J.W. ; Feldpausch, Ted R. ; Galbraith, David ; Gloor, Manuel ; Malhi, Yadvinder ; Aiba, Shin Ichiro ; Alexiades, Miguel N. ; Almeida, Everton C. ; Oliveira, Edmar Almeida de; Dávila, Esteban Álvarez ; Loayza, Patricia Alvarez ; Andrade, Ana ; Vieira, Simone Aparecida ; Aragão, Luiz E.O.C. ; Araujo-Murakami, Alejandro ; Arets, Eric J.M.M. ; Arroyo, Luzmila ; Ashton, Peter ; Aymard C, Gerardo ; Baccaro, Fabrício B. ; Banin, Lindsay F. ; Baraloto, Christopher ; Camargo, Plínio Barbosa ; Barlow, Jos ; Barroso, Jorcely ; Bastin, Jean François ; Batterman, Sarah A. ; Beeckman, Hans ; Begne, Serge K. ; Bennett, Amy C. ; Berenguer, Erika ; Berry, Nicholas ; Blanc, Lilian ; Boeckx, Pascal ; Bogaert, Jan ; Bonal, Damien ; Bongers, Frans ; Bradford, Matt ; Brearley, Francis Q. ; Brncic, Terry ; Brown, Foster ; Burban, Benoit ; Camargo, José Luís ; Castro, Wendeson ; Céron, Carlos ; Ribeiro, Sabina Cerruto ; Moscoso, Victor Chama ; Chave, Jerôme ; Chezeaux, Eric ; Clark, Connie J. ; Souza, Fernanda Coelho de; Collins, Murray ; Comiskey, James A. ; Valverde, Fernando Cornejo ; Medina, Massiel Corrales ; Costa, Lola da; Dančák, Martin ; Dargie, Greta C. ; Davies, Stuart ; Cardozo, Nallaret Davila ; Haulleville, Thales de; Medeiros, Marcelo Brilhante de; Aguila Pasquel, Jhon Del; Derroire, Géraldine ; Fiore, Anthony Di; Doucet, Jean Louis ; Dourdain, Aurélie ; Droissant, Vincent ; Duque, Luisa Fernanda ; Ekoungoulou, Romeo ; Elias, Fernando ; Erwin, Terry ; Esquivel-Muelbert, Adriane ; Fauset, Sophie ; Ferreira, Joice ; Llampazo, Gerardo Flores ; Foli, Ernest ; Ford, Andrew ; Gilpin, Martin ; Hall, Jefferson S. ; Hamer, Keith C. ; Hamilton, Alan C. ; Harris, David J. ; Hart, Terese B. ; Hédl, Radim ; Herault, Bruno ; Herrera, Rafael ; Higuchi, Niro ; Hladik, Annette ; Coronado, Eurídice Honorio ; Huamantupa-Chuquimaco, Isau ; Huasco, Walter Huaraca ; Jeffery, Kathryn J. ; Jimenez-Rojas, Eliana ; Kalamandeen, Michelle ; Djuikouo, Marie Noël Kamdem ; Kearsley, Elizabeth ; Umetsu, Ricardo Keichi ; Kho, Lip Khoon ; Killeen, Timothy ; Kitayama, Kanehiro ; Klitgaard, Bente ; Koch, Alexander ; Labrière, Nicolas ; Laurance, William ; Laurance, Susan ; Leal, Miguel E. ; Levesley, Aurora ; Lima, Adriano J.N. ; Lisingo, Janvier ; Lopes, Aline P. ; Lopez-Gonzalez, Gabriela ; Lovejoy, Tom ; Lovett, Jon C. ; Lowe, Richard ; Magnusson, William E. ; Malumbres-Olarte, Jagoba ; Manzatto, Ângelo Gilberto ; Marimon, Ben Hur ; Marshall, Andrew R. ; Marthews, Toby ; Almeida Reis, Simone Matias de; Maycock, Colin ; Melgaço, Karina ; Mendoza, Casimiro ; Metali, Faizah ; Mihindou, Vianet ; Milliken, William ; Mitchard, Edward T.A. ; Morandi, Paulo S. ; Mossman, Hannah L. ; Nagy, Laszlo ; Nascimento, Henrique ; Neill, David ; Nilus, Reuben ; Vargas, Percy Núñez ; Palacios, Walter ; Camacho, Nadir Pallqui ; Peacock, Julie ; Pendry, Colin ; Peñuela Mora, Maria Cristina ; Pickavance, Georgia C. ; Pipoly, John ; Pitman, Nigel ; Playfair, Maureen ; Poorter, Lourens ; Poulsen, John R. ; Poulsen, Axel Dalberg ; Preziosi, Richard ; Prieto, Adriana ; Primack, Richard B. ; Ramírez-Angulo, Hirma ; Reitsma, Jan ; Réjou-Méchain, Maxime ; Correa, Zorayda Restrepo ; Sousa, Thaiane Rodrigues de; Bayona, Lily Rodriguez ; Roopsind, Anand ; Rudas, Agustín ; Rutishauser, Ervan ; Abu Salim, Kamariah ; Salomão, Rafael P. ; Schietti, Juliana ; Sheil, Douglas ; Silva, Richarlly C. ; Espejo, Javier Silva ; Valeria, Camila Silva ; Silveira, Marcos ; Simo-Droissart, Murielle ; Simon, Marcelo Fragomeni ; Singh, James ; Soto Shareva, Yahn Carlos ; Stahl, Clement ; Stropp, Juliana ; Sukri, Rahayu ; Sunderland, Terry ; Svátek, Martin ; Swaine, Michael D. ; Swamy, Varun ; Taedoumg, Hermann ; Talbot, Joey ; Taplin, James ; Taylor, David ; Steege, Hans Ter; Terborgh, John ; Thomas, Raquel ; Thomas, Sean C. ; Torres-Lezama, Armando ; Umunay, Peter ; Gamarra, Luis Valenzuela ; Heijden, Geertje van der; Hout, Peter van der; Meer, Peter van der; Nieuwstadt, Mark van; Verbeeck, Hans ; Vernimmen, Ronald ; Vicentini, Alberto ; Vieira, Ima Célia Guimarães ; Torre, Emilio Vilanova ; Vleminckx, Jason ; Vos, Vincent ; Wang, Ophelia ; White, Lee J.T. ; Willcock, Simon ; Woods, John T. ; Wortel, Verginia ; Young, Kenneth ; Zagt, Roderick ; Zemagho, Lise ; Zuidema, Pieter A. ; Zwerts, Joeri A. ; Phillips, Oliver L. - \ 2020
    Science 368 (2020)6493. - ISSN 0036-8075 - p. 869 - 874.

    The sensitivity of tropical forest carbon to climate is a key uncertainty in predicting global climate change. Although short-term drying and warming are known to affect forests, it is unknown if such effects translate into long-term responses. Here, we analyze 590 permanent plots measured across the tropics to derive the equilibrium climate controls on forest carbon. Maximum temperature is the most important predictor of aboveground biomass (-9.1 megagrams of carbon per hectare per degree Celsius), primarily by reducing woody productivity, and has a greater impact per °C in the hottest forests (>32.2°C). Our results nevertheless reveal greater thermal resilience than observations of short-term variation imply. To realize the long-term climate adaptation potential of tropical forests requires both protecting them and stabilizing Earth's climate.

    Reproducible molecular networking of untargeted mass spectrometry data using GNPS
    Aron, Allegra T. ; Gentry, Emily C. ; McPhail, Kerry L. ; Nothias, Louis Félix ; Nothias-Esposito, Mélissa ; Bouslimani, Amina ; Petras, Daniel ; Gauglitz, Julia M. ; Sikora, Nicole ; Vargas, Fernando ; Hooft, Justin J.J. van der; Ernst, Madeleine ; Kang, Kyo Bin ; Aceves, Christine M. ; Caraballo-Rodríguez, Andrés Mauricio ; Koester, Irina ; Weldon, Kelly C. ; Bertrand, Samuel ; Roullier, Catherine ; Sun, Kunyang ; Tehan, Richard M. ; Boya P, Cristopher A. ; Christian, Martin H. ; Gutiérrez, Marcelino ; Ulloa, Aldo Moreno ; Tejeda Mora, Javier Andres ; Mojica-Flores, Randy ; Lakey-Beitia, Johant ; Vásquez-Chaves, Victor ; Zhang, Yilue ; Calderón, Angela I. ; Tayler, Nicole ; Keyzers, Robert A. ; Tugizimana, Fidele ; Ndlovu, Nombuso ; Aksenov, Alexander A. ; Jarmusch, Alan K. ; Schmid, Robin ; Truman, Andrew W. ; Bandeira, Nuno ; Wang, Mingxun ; Dorrestein, Pieter C. - \ 2020
    Nature protocols 15 (2020). - ISSN 1754-2189 - p. 1954 - 1991.

    Global Natural Product Social Molecular Networking (GNPS) is an interactive online small molecule–focused tandem mass spectrometry (MS2) data curation and analysis infrastructure. It is intended to provide as much chemical insight as possible into an untargeted MS2 dataset and to connect this chemical insight to the user’s underlying biological questions. This can be performed within one liquid chromatography (LC)-MS2 experiment or at the repository scale. GNPS-MassIVE is a public data repository for untargeted MS2 data with sample information (metadata) and annotated MS2 spectra. These publicly accessible data can be annotated and updated with the GNPS infrastructure keeping a continuous record of all changes. This knowledge is disseminated across all public data; it is a living dataset. Molecular networking—one of the main analysis tools used within the GNPS platform—creates a structured data table that reflects the molecular diversity captured in tandem mass spectrometry experiments by computing the relationships of the MS2 spectra as spectral similarity. This protocol provides step-by-step instructions for creating reproducible, high-quality molecular networks. For training purposes, the reader is led through a 90- to 120-min procedure that starts by recalling an example public dataset and its sample information and proceeds to creating and interpreting a molecular network. Each data analysis job can be shared or cloned to disseminate the knowledge gained, thus propagating information that can lead to the discovery of molecules, metabolic pathways, and ecosystem/community interactions.

    Feedback between drought and deforestation in the Amazon
    Staal, Arie ; Flores, Bernardo M. ; Aguiar, Ana Paula D. ; Bosmans, Joyce H.C. ; Fetzer, Ingo ; Tuinenburg, Obbe A. - \ 2020
    Environmental Research Letters 15 (2020)4. - ISSN 1748-9318
    Agriculture - Fire - Forest clearing - Land use change - Modeling - Moisture recycling - Remote sensing

    Deforestation and drought are among the greatest environmental pressures on the Amazon rainforest, possibly destabilizing the forest-climate system. Deforestation in the Amazon reduces rainfall regionally, while this deforestation itself has been reported to be facilitated by droughts. Here we quantify the interactions between drought and deforestation spatially across the Amazon during the early 21st century. First, we relate observed fluctuations in deforestation rates to dry-season intensity; second, we determine the effect of conversion of forest to cropland on evapotranspiration; and third, we simulate the subsequent downwind reductions in rainfall due to decreased atmospheric water input. We find large variability in the response of deforestation to dry-season intensity, with a significant but small average increase in deforestation rates with a more intense dry season: With every mm of water deficit, deforestation tends to increase by 0.13% per year. Deforestation, in turn, has caused an estimated 4% of the recent observed drying, with the south-western part of the Amazon being most strongly affected. Combining both effects, we quantify a reinforcing drought-deforestation feedback that is currently small, but becomes gradually stronger with cumulative deforestation. Our results suggest that global climate change, not deforestation, is the main driver of recent drying in the Amazon. However, a feedback between drought and deforestation implies that increases in either of them will impede efforts to curb both.

    Author Correction: A global database for metacommunity ecology, integrating species, traits, environment and space
    Jeliazkov, Alienor ; Mijatovic, Darko ; Chantepie, Stéphane ; Andrew, Nigel ; Arlettaz, Raphaël ; Barbaro, Luc ; Barsoum, Nadia ; Bartonova, Alena ; Belskaya, Elena ; Bonada, Núria ; Brind’Amour, Anik ; Carvalho, Rodrigo ; Castro, Helena ; Chmura, Damian ; Choler, Philippe ; Chong-Seng, Karen ; Cleary, Daniel ; Cormont, Anouk ; Cornwell, William ; Campos, Ramiro de; Voogd, Nicole de; Doledec, Sylvain ; Drew, Joshua ; Dziock, Frank ; Eallonardo, Anthony ; Edgar, Melanie J. ; Farneda, Fábio ; Hernandez, Domingo Flores ; Frenette-Dussault, Cédric ; Fried, Guillaume ; Gallardo, Belinda ; Gibb, Heloise ; Gonçalves-Souza, Thiago ; Higuti, Janet ; Humbert, Jean Yves ; Krasnov, Boris R. ; Saux, Eric Le ; Lindo, Zoe ; Lopez-Baucells, Adria ; Lowe, Elizabeth ; Marteinsdottir, Bryndis ; Martens, Koen ; Meffert, Peter ; Mellado-Díaz, Andres ; Menz, Myles H.M. ; Meyer, Christoph F.J. ; Miranda, Julia Ramos ; Mouillot, David ; Ossola, Alessandro ; Pakeman, Robin ; Pavoine, Sandrine ; Pekin, Burak ; Pino, Joan ; Pocheville, Arnaud ; Pomati, Francesco ; Poschlod, Peter ; Prentice, Honor C. ; Purschke, Oliver ; Raevel, Valerie ; Reitalu, Triin ; Renema, Willem ; Ribera, Ignacio ; Robinson, Natalie ; Robroek, Bjorn ; Rocha, Ricardo ; Shieh, Sen Her ; Spake, Rebecca ; Staniaszek-Kik, Monika ; Stanko, Michal ; Tejerina-Garro, Francisco Leonardo ; Braak, Cajo ter; Urban, Mark C. ; Klink, Roel van; Villéger, Sébastien ; Wegman, Ruut ; Westgate, Martin J. ; Wolff, Jonas ; Żarnowiec, Jan ; Zolotarev, Maxim ; Chase, Jonathan M. - \ 2020
    Scientific Data 7 (2020)1. - ISSN 2052-4463

    Following publication of this Data Descriptor it was found that the affiliation of Oliver Purschke was stated incorrectly. The correct affiliations are stated below: Department of Physical Geography and Ecosystem Science, Lund University, Sölvegatan 37, SE-223 62 Lund, Sweden Biodiversity, Department of Biology, Lund University, Sölvegatan 37, SE-223 62 Lund, Sweden This has been corrected in both the HTML and PDF versions.

    A global database for metacommunity ecology, integrating species, traits, environment and space
    Jeliazkov, Alienor ; Mijatovic, Darko ; Chantepie, Stéphane ; Andrew, Nigel ; Arlettaz, Raphaël ; Barbaro, Luc ; Barsoum, Nadia ; Bartonova, Alena ; Belskaya, Elena ; Bonada, Núria ; Brind’Amour, Anik ; Carvalho, Rodrigo ; Castro, Helena ; Chmura, Damian ; Choler, Philippe ; Chong-Seng, Karen ; Cleary, Daniel ; Cormont, Anouk ; Cornwell, William ; Campos, Ramiro de; Voogd, Nicole de; Doledec, Sylvain ; Drew, Joshua ; Dziock, Frank ; Eallonardo, Anthony ; Edgar, Melanie J. ; Farneda, Fábio ; Hernandez, Domingo Flores ; Frenette-Dussault, Cédric ; Fried, Guillaume ; Gallardo, Belinda ; Gibb, Heloise ; Gonçalves-Souza, Thiago ; Higuti, Janet ; Humbert, Jean Yves ; Krasnov, Boris R. ; Saux, Eric Le ; Lindo, Zoe ; Lopez-Baucells, Adria ; Lowe, Elizabeth ; Marteinsdottir, Bryndis ; Martens, Koen ; Meffert, Peter ; Mellado-Díaz, Andres ; Menz, Myles H.M. ; Meyer, Christoph F.J. ; Miranda, Julia Ramos ; Mouillot, David ; Ossola, Alessandro ; Pakeman, Robin ; Pavoine, Sandrine ; Pekin, Burak ; Pino, Joan ; Pocheville, Arnaud ; Pomati, Francesco ; Poschlod, Peter ; Prentice, Honor C. ; Purschke, Oliver ; Raevel, Valerie ; Reitalu, Triin ; Renema, Willem ; Ribera, Ignacio ; Robinson, Natalie ; Robroek, Bjorn ; Rocha, Ricardo ; Shieh, Sen Her ; Spake, Rebecca ; Staniaszek-Kik, Monika ; Stanko, Michal ; Tejerina-Garro, Francisco Leonardo ; Braak, Cajo ter; Urban, Mark C. ; Klink, Roel van; Villéger, Sébastien ; Wegman, Ruut ; Westgate, Martin J. ; Wolff, Jonas ; Żarnowiec, Jan ; Zolotarev, Maxim ; Chase, Jonathan M. - \ 2020
    Scientific Data 7 (2020)1. - ISSN 2052-4463

    The use of functional information in the form of species traits plays an important role in explaining biodiversity patterns and responses to environmental changes. Although relationships between species composition, their traits, and the environment have been extensively studied on a case-by-case basis, results are variable, and it remains unclear how generalizable these relationships are across ecosystems, taxa and spatial scales. To address this gap, we collated 80 datasets from trait-based studies into a global database for metaCommunity Ecology: Species, Traits, Environment and Space; “CESTES”. Each dataset includes four matrices: species community abundances or presences/absences across multiple sites, species trait information, environmental variables and spatial coordinates of the sampling sites. The CESTES database is a live database: it will be maintained and expanded in the future as new datasets become available. By its harmonized structure, and the diversity of ecosystem types, taxonomic groups, and spatial scales it covers, the CESTES database provides an important opportunity for synthetic trait-based research in community ecology.

    Identifying and Quantifying the Abundance of Economically Important Palms in Tropical Moist Forest Using UAV Imagery
    Tagle Casapia, Ximena ; Falen, Lourdes ; Bartholomeus, Harm ; Cárdenas, Rodolfo ; Flores, Gerardo ; Herold, Martin ; Honorio Coronado, Eurídice N. ; Baker, Timothy R. - \ 2020
    Remote Sensing 12 (2020)1. - ISSN 2072-4292 - 26 p.
    Sustainable management of non-timber forest products such as palm fruits is crucial for the long-term conservation of intact forest. A major limitation to expanding sustainable management of palms has been the need for precise information about the resources at scales of tens to hundreds of hectares, while typical ground-based surveys only sample small areas. In recent years, small unmanned aerial vehicles (UAVs) have become an important tool for mapping forest areas as they are cheap and easy to transport, and they provide high spatial resolution imagery of remote areas. We developed an object-based classification workflow for RGB UAV imagery which aims to identify and delineate palm tree crowns in the tropical rainforest by combining image processing and GIS functionalities using color and textural information in an integrative way to show one of the potential uses of UAVs in tropical forests. Ten permanent forest plots with 1170 reference palm trees were assessed from October to December 2017. The results indicate that palm tree crowns could be clearly identified and, in some cases, quantified following the workflow. The best results were obtained using the random forest classifier with an 85% overall accuracy and 0.82 kappa index.
    Correction to: Soil erosion as a resilience drain in disturbed tropical forests
    Flores, Bernardo M. ; Staal, Arie ; Jakovac, Catarina C. ; Hirota, Marina ; Holmgren, Milena ; Oliveira, Rafael S. - \ 2020
    Plant and Soil 450 (2020)27. - ISSN 0032-079X

    In the original version of this article, the following text must be added in the acknowledgement. M.H., B.M.F. and R.S.O. acknowledge the project grant from Instituto Serrapilheira/Serra-1709–18983.

    Soil erosion as a resilience drain in disturbed tropical forests
    Flores, Bernardo M. ; Staal, Arie ; Jakovac, Catarina C. ; Hirota, Marina ; Holmgren, Milena ; Oliveira, Rafael S. - \ 2020
    Plant and Soil 450 (2020). - ISSN 0032-079X - p. 11 - 25.
    Dynamics - Ecosystem services - Feedback - Forest restoration - Global change - Secondary forests

    Background: Tropical forests are threatened by intensifying natural and anthropogenic disturbance regimes. Disturbances reduce tree cover and leave the organic topsoil vulnerable to erosion processes, but when resources are still abundant forests usually recover. Scope: Across the tropics, variation in rainfall erosivity – a measure of potential soil exposure to water erosion – indicates that soils in the wetter regions would experience high erosion rates if they were not protected by tree cover. However, twenty-first-century global land cover data reveal that in wet South America tropical tree cover is decreasing and bare soil area is increasing. Here we address the role of soil erosion in a positive feedback mechanism that may persistently alter the functioning of disturbed tropical forests. Conclusions: Based on an extensive literature review, we propose a conceptual model in which soil erosion reinforces disturbance effects on tropical forests, reducing their resilience with time and increasing their likelihood of being trapped in an alternative vegetation state that is persistently vulnerable to erosion. We present supporting field evidence from two distinct forests in central Amazonia that have been repeatedly disturbed. Overall, the strength of the erosion feedback depends on disturbance types and regimes, as well as on local environmental conditions, such as topography, flooding, and soil fertility. As disturbances intensify in tropical landscapes, we argue that the erosion feedback may help to explain why certain forests persist in a degraded state and often undergo critical functional shifts.

    Disentangling ‘ecosystem services’ and ‘nature’s contributions to people’
    Kadykalo, Andrew N. ; López-Rodriguez, María D. ; Ainscough, Jacob ; Droste, Nils ; Ryu, Hyeonju ; Ávila-Flores, Giovanni ; Clec’h, Solen Le; Muñoz, Marcia C. ; Nilsson, Lovisa ; Rana, Sakshi ; Sarkar, Priyanka ; Sevecke, Katharina J. ; Harmáčková, Zuzana V. - \ 2019
    Ecosystems and People 15 (2019)1. - ISSN 2639-5908 - p. 269 - 287.
    Ecosystem services - IPBES - nature’s benefits to people - nature’s contributions to people - NCP - Patricia Balvanera - people and nature - science–policy interface

    People depend on functioning ecosystems, which provide benefits that support human existence and wellbeing. The relationship between people and nature has been experienced and conceptualized in multiple ways. Recently, ecosystem services (ES) concepts have permeated science, government policies, multi-national environmental agreements, and science–policy interfaces. In 2017, the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) introduced a new and closely related concept–Nature’s Contributions to People (NCP). The introduction of NCP has sparked some lively discussion and confusion about the distinguishing characteristics between ES and NCP. In order to clarify their conceptual relation, we identify eleven specific claims about novel elements from the latest NCP literature and analyze how far ES research has already contributed to these corresponding conceptual claims in the existing ES literature. We find a mixed-picture, where on six specific conceptual claims (culture, social sciences and humanities, indigenous and local knowledge, negative contributions of nature, generalizing perspective, non-instrumental values and valuation) NCP does not differ greatly from past ES research, but we also find five conceptual claims (diverse worldviews, context-specific perspective, relational values, fuzzy and fluid reporting categories and groups, inclusive language and framing) where NCP provides novel conceptualizations of people and nature relations.

    Sea ice production and ecology study (SIPES2)
    Castellani, G. ; Meiners, K. ; Kuhn, S. ; Milnes, M. ; M., Vortkamp ; Meijboom, A. ; Feij, B. ; Dorssen, M. van; Flores, H. ; Putte, A.P. van de; Schaafsma, F.L. ; Franeker, J.A. van - \ 2019
    In: The expedition PS117 of the research vessel Polarstern to the Weddell Sea / Boebel, O., Bremerhaven : AWI Alfred-Wegener-Institut (Berichte zur Polar- und Meeresforschung ) - p. 132 - 146.
    Rarity of monodominance in hyperdiverse Amazonian forests
    Steege, Hans Ter; Henkel, Terry W. ; Helal, Nora ; Marimon, Beatriz S. ; Marimon-Junior, Ben Hur ; Huth, Andreas ; Groeneveld, Jürgen ; Sabatier, Daniel ; Souza Coelho, Luiz de; Andrade Lima Filho, Diogenes de; Salomão, Rafael P. ; Amaral, Iêda Leão ; Almeida Matos, Francisca Dionízia de; Castilho, Carolina V. ; Phillips, Oliver L. ; Guevara, Juan Ernesto ; Jesus Veiga Carim, Marcelo de; Cárdenas López, Dairon ; Magnusson, William E. ; Wittmann, Florian ; Irume, Mariana Victória ; Martins, Maria Pires ; Silva Guimarães, José Renan da; Molino, Jean François ; Bánki, Olaf S. ; Piedade, Maria Teresa Fernandez ; Pitman, Nigel C.A. ; Mendoza, Abel Monteagudo ; Ramos, José Ferreira ; Luize, Bruno Garcia ; Moraes de Leão Novo, Evlyn Márcia ; Núñez Vargas, Percy ; Silva, Thiago Sanna Freire ; Venticinque, Eduardo Martins ; Manzatto, Angelo Gilberto ; Reis, Neidiane Farias Costa ; Terborgh, John ; Casula, Katia Regina ; Honorio Coronado, Euridice N. ; Montero, Juan Carlos ; Feldpausch, Ted R. ; Duque, Alvaro ; Costa, Flávia R.C. ; Arboleda, Nicolás Castaño ; Schöngart, Jochen ; Killeen, Timothy J. ; Vasquez, Rodolfo ; Mostacedo, Bonifacio ; Demarchi, Layon O. ; Assis, Rafael L. ; Baraloto, Chris ; Engel, Julien ; Petronelli, Pascal ; Castellanos, Hernán ; Medeiros, Marcelo Brilhante de; Quaresma, Adriano ; Simon, Marcelo Fragomeni ; Andrade, Ana ; Camargo, José Luís ; Laurance, Susan G.W. ; Laurance, William F. ; Rincón, Lorena M. ; Schietti, Juliana ; Sousa, Thaiane R. ; Sousa Farias, Emanuelle de; Lopes, Maria Aparecida ; Magalhães, José Leonardo Lima ; Mendonça Nascimento, Henrique Eduardo ; Lima de Queiroz, Helder ; Aymard C, Gerardo A. ; Brienen, Roel ; Revilla, Juan David Cardenas ; Vieira, Ima Célia Guimarães ; Cintra, Bruno Barçante Ladvocat ; Stevenson, Pablo R. ; Feitosa, Yuri Oliveira ; Duivenvoorden, Joost F. ; Mogollón, Hugo F. ; Araujo-Murakami, Alejandro ; Ferreira, Leandro Valle ; Lozada, José Rafael ; Comiskey, James A. ; Toledo, José Julio de; Damasco, Gabriel ; Dávila, Nállarett ; Draper, Freddie ; García-Villacorta, Roosevelt ; Lopes, Aline ; Vicentini, Alberto ; Alonso, Alfonso ; Dallmeier, Francisco ; Gomes, Vitor H.F. ; Lloyd, Jon ; Neill, David ; Aguiar, Daniel Praia Portela de; Arroyo, Luzmila ; Carvalho, Fernanda Antunes ; Souza, Fernanda Coelho de; Amaral, Dário Dantas do; Feeley, Kenneth J. ; Gribel, Rogerio ; Pansonato, Marcelo Petratti ; Barlow, Jos ; Berenguer, Erika ; Ferreira, Joice ; Fine, Paul V.A. ; Guedes, Marcelino Carneiro ; Jimenez, Eliana M. ; Licona, Juan Carlos ; Peñuela Mora, Maria Cristina ; Villa, Boris ; Cerón, Carlos ; Maas, Paul ; Silveira, Marcos ; Stropp, Juliana ; Thomas, Raquel ; Baker, Tim R. ; Daly, Doug ; Dexter, Kyle G. ; Huamantupa-Chuquimaco, Isau ; Milliken, William ; Pennington, Toby ; Ríos Paredes, Marcos ; Fuentes, Alfredo ; Klitgaard, Bente ; Pena, José Luis Marcelo ; Peres, Carlos A. ; Silman, Miles R. ; Tello, J.S. ; Chave, Jerome ; Cornejo Valverde, Fernando ; Fiore, Anthony Di; Hilário, Renato Richard ; Phillips, Juan Fernando ; Rivas-Torres, Gonzalo ; Andel, Tinde R. van; Hildebrand, Patricio von; Noronha, Janaína Costa ; Barbosa, Edelcilio Marques ; Barbosa, Flávia Rodrigues ; Matos Bonates, Luiz Carlos de; Sá Carpanedo, Rainiellen de; Dávila Doza, Hilda Paulette ; Fonty, Émile ; GómeZárate Z, Ricardo ; Gonzales, Therany ; Gallardo Gonzales, George Pepe ; Hoffman, Bruce ; Junqueira, André Braga ; Malhi, Yadvinder ; Andrade Miranda, Ires Paula de; Pinto, Linder Felipe Mozombite ; Prieto, Adriana ; Jesus Rodrigues, Domingos de; Rudas, Agustín ; Ruschel, Ademir R. ; Silva, Natalino ; Vela, César I.A. ; Vos, Vincent Antoine ; Zent, Egleé L. ; Zent, Stanford ; Weiss Albuquerque, Bianca ; Cano, Angela ; Carrero Márquez, Yrma Andreina ; Correa, Diego F. ; Costa, Janaina Barbosa Pedrosa ; Flores, Bernardo Monteiro ; Galbraith, David ; Holmgren, Milena ; Kalamandeen, Michelle ; Nascimento, Marcelo Trindade ; Oliveira, Alexandre A. ; Ramirez-Angulo, Hirma ; Rocha, Maira ; Scudeller, Veridiana Vizoni ; Sierra, Rodrigo ; Tirado, Milton ; Umaña Medina, Maria Natalia ; Heijden, Geertje van der; Vilanova Torre, Emilio ; Vriesendorp, Corine ; Wang, Ophelia ; Young, Kenneth R. ; Ahuite Reategui, Manuel Augusto ; Baider, Cláudia ; Balslev, Henrik ; Cárdenas, Sasha ; Casas, Luisa Fernanda ; Farfan-Rios, William ; Ferreira, Cid ; Linares-Palomino, Reynaldo ; Mendoza, Casimiro ; Mesones, Italo ; Torres-Lezama, Armando ; Giraldo, Ligia Estela Urrego ; Villarroel, Daniel ; Zagt, Roderick ; Alexiades, Miguel N. ; Oliveira, Edmar Almeida de; Garcia-Cabrera, Karina ; Hernandez, Lionel ; Palacios Cuenca, Walter ; Pansini, Susamar ; Pauletto, Daniela ; Ramirez Arevalo, Freddy ; Sampaio, Adeilza Felipe ; Valderrama Sandoval, Elvis H. ; Valenzuela Gamarra, Luis ; Levesley, Aurora ; Pickavance, Georgia ; Melgaço, Karina - \ 2019
    Scientific Reports 9 (2019). - ISSN 2045-2322

    Tropical forests are known for their high diversity. Yet, forest patches do occur in the tropics where a single tree species is dominant. Such "monodominant" forests are known from all of the main tropical regions. For Amazonia, we sampled the occurrence of monodominance in a massive, basin-wide database of forest-inventory plots from the Amazon Tree Diversity Network (ATDN). Utilizing a simple defining metric of at least half of the trees ≥ 10 cm diameter belonging to one species, we found only a few occurrences of monodominance in Amazonia, and the phenomenon was not significantly linked to previously hypothesized life history traits such wood density, seed mass, ectomycorrhizal associations, or Rhizobium nodulation. In our analysis, coppicing (the formation of sprouts at the base of the tree or on roots) was the only trait significantly linked to monodominance. While at specific locales coppicing or ectomycorrhizal associations may confer a considerable advantage to a tree species and lead to its monodominance, very few species have these traits. Mining of the ATDN dataset suggests that monodominance is quite rare in Amazonia, and may be linked primarily to edaphic factors.

    Robustness of trait connections across environmental gradients and growth forms
    Flores-Moreno, Habacuc ; Fazayeli, Farideh ; Banerjee, Arindam ; Datta, Abhirup ; Kattge, Jens ; Butler, Ethan E. ; Atkin, Owen K. ; Wythers, Kirk ; Chen, Ming ; Anand, Madhur ; Bahn, Michael ; Byun, Chaeho ; Cornelissen, Hans C. ; Craine, Joseph ; Gonzalez-Melo, Andres ; Hattingh, Wesley N. ; Jansen, Steven ; Kraft, Nathan J.B. ; Kramer, Koen ; Laughlin, Daniel C. ; Minden, Vanessa ; Niinemets, Ülo ; Onipchenko, Vladimir ; Peñuelas, Josep ; Soudzilovskaia, Nadejda A. ; Dalrymple, Rhiannon L. ; Reich, Peter B. - \ 2019
    Global Ecology and Biogeography 28 (2019)12. - ISSN 1466-822X - p. 1806 - 1826.
    leaf traits - plant functional traits - plant strategy integration - seed traits - stem traits - trait interdependence - trait networks

    Aim: Plant trait databases often contain traits that are correlated, but for whom direct (undirected statistical dependency) and indirect (mediated by other traits) connections may be confounded. The confounding of correlation and connection hinders our understanding of plant strategies, and how these vary among growth forms and climate zones. We identified the direct and indirect connections across plant traits relevant to competition, resource acquisition and reproductive strategies using a global database and explored whether connections within and between traits from different tissue types vary across climates and growth forms. Location: Global. Major taxa studied: Plants. Time period: Present. Methods: We used probabilistic graphical models and a database of 10 plant traits (leaf area, specific leaf area, mass- and area-based leaf nitrogen and phosphorous content, leaf life span, plant height, stem specific density and seed mass) with 16,281 records to describe direct and indirect connections across woody and non-woody plants across tropical, temperate, arid, cold and polar regions. Results: Trait networks based on direct connections are sparser than those based on correlations. Land plants had high connectivity across traits within and between tissue types; leaf life span and stem specific density shared direct connections with all other traits. For both growth forms, two groups of traits form modules of more highly connected traits; one related to resource acquisition, the other to plant architecture and reproduction. Woody species had higher trait network modularity in polar compared to temperate and tropical climates, while non-woody species did not show significant differences in modularity across climate regions. Main conclusions: Plant traits are highly connected both within and across tissue types, yet traits segregate into persistent modules of traits. Variation in the modularity of trait networks suggests that trait connectivity is shaped by prevailing environmental conditions and demonstrates that plants of different growth forms use alternative strategies to cope with local conditions.

    Loss rates of honey bee colonies during winter 2017/18 in 36 countries participating in the COLOSS survey, including effects of forage sources
    Gray, Alison ; Brodschneider, Robert ; Adjlane, Noureddine ; Ballis, Alexis ; Brusbardis, Valters ; Charrière, Jean Daniel ; Chlebo, Robert ; F. Coffey, Mary ; Cornelissen, Bram ; Amaro da Costa, Cristina ; Csáki, Tamás ; Dahle, Bjørn ; Danihlík, Jiří ; Dražić, Marica Maja ; Evans, Garth ; Fedoriak, Mariia ; Forsythe, Ivan ; Graaf, Dirk de; Gregorc, Aleš ; Johannesen, Jes ; Kauko, Lassi ; Kristiansen, Preben ; Martikkala, Maritta ; Martín-Hernández, Raquel ; Medina-Flores, Carlos Aurelio ; Mutinelli, Franco ; Patalano, Solenn ; Petrov, Plamen ; Raudmets, Aivar ; Ryzhikov, Vladimir A. ; Simon-Delso, Noa ; Stevanovic, Jevrosima ; Topolska, Grazyna ; Uzunov, Aleksandar ; Vejsnaes, Flemming ; Williams, Anthony ; Zammit-Mangion, Marion ; Soroker, Victoria - \ 2019
    Journal of Apicultural Research 58 (2019)4. - ISSN 0021-8839 - p. 479 - 485.
    Apis mellifera - beekeeping - citizen science - colony winter losses - forage sources - monitoring - mortality - survey

    This short article presents loss rates of honey bee colonies over winter 2017/18 from 36 countries, including 33 in Europe, from data collected using the standardized COLOSS questionnaire. The 25,363 beekeepers supplying data passing consistency checks in total wintered 544,879 colonies, and reported 26,379 (4.8%, 95% CI 4.7–5.0%) colonies with unsolvable queen problems, 54,525 (10.0%, 95% CI 9.8–10.2%) dead colonies after winter and another 8,220 colonies (1.5%, 95% CI 1.4–1.6%) lost through natural disaster. This gave an overall loss rate of 16.4% (95% CI 16.1–16.6%) of honey bee colonies during winter 2017/18, but this varied greatly from 2.0 to 32.8% between countries. The included map shows relative risks of winter loss at regional level. The analysis using the total data-set confirmed findings from earlier surveys that smaller beekeeping operations with at most 50 colonies suffer significantly higher losses than larger operations (p <.001). Beekeepers migrating their colonies had significantly lower losses than those not migrating (p <.001), a different finding from previous research. Evaluation of six different forage sources as potential risk factors for colony loss indicated that intensive foraging on any of five of these plant sources (Orchards, Oilseed Rape, Maize, Heather and Autumn Forage Crops) was associated with significantly higher winter losses. This finding requires further study and explanation. A table is included giving detailed results of loss rates and the impact of the tested forage sources for each country and overall.

    Growth rings of Brazil nut trees (Bertholletia excelsa) as a living record of historical human disturbance in Central Amazonia
    Caetano Andrade, Victor L. ; Flores, Bernardo M. ; Levis, Carolina ; Clement, Charles R. ; Roberts, Patrick ; Schöngart, Jochen - \ 2019
    PLoS ONE 14 (2019)4. - ISSN 1932-6203

    The Brazil nut tree (Bertholletia excelsa) is an iconic and economically valuable species that dominates vast swathes of the Amazon Basin. This species seems to have been an important part of human subsistence strategies in the region from at least the Early Holocene, and its current distribution may be a legacy of past human settlement. Because B. excelsa is a long-lived pioneer tree it requires natural or human disturbances to increase light availability in the understory for a successful establishment. However, it remains unclear how the long-term population dynamics of this species have been shaped by pre-colonial and post-colonial human practices. Here, we use tree-ring analyses to look at changes in growing conditions over the past 400 years in a Brazil nut tree population in Central Amazonia. We identify changes in tree recruitment and growth rates associated not only with regional climatic variability, but also major political and socio-economic activities recorded by historical documents in the vicinity of Manaus. We demonstrate that the expansion of a post-colonial political center (Manaus) from the middle of the 18 th century onwards coincided with a reduction in recruitment of B. excelsa. We argue that this hiatus suggests the interruption of indigenous management practices, probably due to the collapse of pre-Columbian societies. A second recruitment pulse, and unprecedented cycles of growth release and suppression, aligns with a shift to modern exploitation of the forest into the 20 th century. Our findings shed light on how past histories of human-forest interactions can be revealed by the growth rings of trees in Amazonia. Future interdisciplinary analysis of these trees should enable more detailed investigation of how human forest management has changed in this part of the world, through pre-colonial, colonial, and industrial periods of human activity, with potential implications for conservation.

    Self-foraging vs facilitated foraging by Lesser Black-backed Gull (Larus fuscus) at the Frisian Front, the Netherlands
    Baptist, Martin ; Bemmelen, Rob Van; Leopold, Mardik ; Haan, Dick De; Flores, Hauke ; Couperus, Bram ; Fassler, Sascha ; Geelhoed, Steve - \ 2019
    Bulletin of Marine Science 95 (2019)1. - ISSN 0007-4977 - p. 29 - 43.
    The Lesser Black-backed Gull (Larus fuscus Linnaeus, 1758) is a surface feeder with a broad prey spectrum that forages in the North Sea on subsurface pelagic fishes and crabs swimming within 0.6 m of the sea surface. In July 2006 and in July/August 2009 we surveyed the Frisian Front area in the southern North Sea (53.4oN-54.3oN 4.0oE-5.5oE) to determine the prey base for Lesser Black-backed Gulls. In July/August 2009 we conducted bird counts in an integrated ecosystem survey by simultaneously sampling subsurface pelagic prey by a combination of fishing and echosounding. Lesser Black-backed Gulls make use of facilitated foraging to improve the catchability of their prey. The two most important aids for facilitated foraging by Lesser Black-backed Gull in the Frisian Front were i) multi-species feeding associations with Common Murre and ii) fisheries discarding bycatch and offal. We found that in the top meter of the water column the natural prey base is large enough to provide for self-foraging, however, Lesser Black-backed Gulls were found to rely mainly on facilitated foraging.
    Tenure, property rights and forest landscape restoration
    Jong, Wil de; Zon, Marieke van der; Urushima, Andrea Flores ; Youn, Yeo Chang ; Liu, Jinlong ; Li, Ning - \ 2018
    In: Forest Landscape Restoration London : Taylor and Francis - ISBN 9781138084292 - p. 158 - 175.
    Legal tenure and related property rights are relevant and important in forest landscape restoration (FLR), although the assumption that ensuring legal tenure with full property rights is a decisive incentive in and of itself for forest restoration is not supported by empirical evidence. Legal tenure status over forest lands, and property rights derived from legal tenure, are diverse between countries, and even within countries. Case studies from China, Vietnam and Nepal show that even when legal tenure is held over forest land, the property rights derived from tenure may be severely constrained and not necessarily widely recognized, respected or protected. Legal tenure may be a less desired option in terms of rights that are granted, and other arrangements, that is, customary arrangements or other forms of non-statutory enforced arrangements, may result in more secure rights. When FLR is desired, legal tenure needs to be addressed, but what kind of tenure is provided to forest users, what rights the tenure implies, and what constraints are the most appropriate depend on the wider legal, political and social context in which forest restoration is being pursued.
    Flores, Acaparamiento del Agua y Responsabilidad Empresarial Social: Certificación de la producción de rosas y reclamos por la justicia ambiental en el Ecuador
    Mena Vásconez, P.A. ; Ommen, Pippi van; Vos, J.M.C. ; Boelens, R.A. - \ 2018
    Cuadernos de Geografia 101 (2018). - ISSN 0210-086X - p. 189 - 214.
    Commercial production of flowers, accumulation of water, and social struggles for equitable distribution and a healthier environment have an intimate relationship. Ecuador is the third world exporter of roses. Cayambe-Tabacundo is the main production region and counts with major water conflicts.
    Large floriculturists accumulate water, leaving the rest for subsistence agriculture and livestock in indigenous communities. Floriculture uses private environmental and fair-trade certification, but the standards are permissive. This article analyzes the power relations that steer flower certification practices. It concludes that only after pressure from government agencies, NGOs and user associations, floriculture began to meet the standards.
    Life in de polar oceans : the role of sea ice in the biology and ecology of marine species
    Schaafsma, Fokje Lieuwkje - \ 2018
    Wageningen University. Promotor(en): H. Lindeboom, co-promotor(en): J.A. van Franeker; H. Flores. - Wageningen : Wageningen University - ISBN 9789463433549 - 227

    Algae and other small organisms can be found living in the sea ice of the polar oceans, which in turn form a food source for animals living underneath the sea ice. In addition, the sea ice has other functions in the ecosystems, for example as a platform for reproduction or as a hiding place against predators. Knowledge on how organisms use the sea ice remains incomplete. Collecting biological samples from underneath the ice, necessary to unravel polar ecosystems and food chains, is very difficult. Such knowledge is, however, necessary for making nature protection and fisheries policies. In order to collect such samples a ‘Surface and Under Ice Trawl’ (SUIT) was developed, enabling sampling of the surface water directly underneath the ice. This fishing gear was used during this research on the importance of sea ice in the ecosystem of both the Arctic and the Antarctic.

    Antarctic krill are central in the ecosystem of the Southern Ocean. The winter is a harsh period for young Antarctic krill that were born in the preceding summer. This is because the young krill did not yet have the chance to build up reserves, preparing them for the lack of food during this season. The research showed that young krill living in ice-covered waters, accumulated at the under-ice surface. Here, they were feeding mainly on sea-ice algae and other organisms that were closely associated with the sea ice. Sea-ice resources are thus essential for the condition and survival of young krill living in waters that are covered with sea ice.

    In the Arctic ocean it is known that one- and two-year old polar cod reside closely to the sea-ice surface. Results showed that these fish also mainly feed on organisms that are closely associated with the sea ice. The research indicated that the sea ice provides sufficient resources for the polar cod to feed on, and that sea-ice decline, as a consequence of climate warming, can potentially have negative effects.

    Although key species such as Antarctic krill and polar cod form the core of this study, the energetic value of all species provide important knowledge for understanding the food chain of the polar oceans. Therefore, the energy density of as many species as possible was investigated, in order to understand the attractiveness of the sea-ice for sea birds, seals and whales.

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