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.

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    Dispersal versus environmental filtering in a dynamic system: drivers of vegetation patterns and diversity along stream riparian gradients
    Fraaije, R.G.A. ; Braak, C.J.F. ter; Verduyn, B. ; Verhoeven, Jos T.A. ; Soons, M.B. - \ 2015
    Wageningen UR
    community assembly - determinants of plant commiunity diversity and structure - directed dispersal - hydrological gradients - lowland streams - neutral versus niche - plant diversity - riparian vegetation - riparian zone - wetland restoration
    1. Both environmental filtering and dispersal filtering are known to influence plant species distribution patterns and biodiversity. Particularly in dynamic habitats, however, it remains unclear whether environmental filtering (stimulated by stressful conditions) or dispersal filtering (during re-colonization events) dominates in community assembly, or how they interact. Such a fundamental understanding of community assembly is critical to the design of biodiversity conservation and restoration strategies. 2. Stream riparian zones are species-rich dynamic habitats. They are characterized by steep hydrological gradients likely to promote environmental filtering, and by spatiotemporal variation in the arrival of propagules likely to promote dispersal filtering. We quantified the contributions of both filters by monitoring natural seed arrival (dispersal filter) and experimentally assessing germination, seedling survival and growth of 17 riparian plant species (environmental filter) along riparian gradients of three lowland streams that were excavated to bare substrate for restoration. Subsequently, we related spatial patterns in each process to species distribution and diversity patterns after 1 and 2 years of succession. 3. Patterns in initial seed arrival were very clearly reflected in species distribution patterns in the developing vegetation and were more significant than environmental filtering. However, environmental filtering intensified towards the wet end of the riparian gradient, particularly through effects of flooding on survival and growth, which strongly affected community diversity and generated a gradient in the vegetation. Strikingly, patterns in seed arrival foreshadowed the gradient that developed in the vegetation; seeds of species with adult optima at wetter conditions dominated seed arrival at low elevations along the riparian gradient while seeds of species with drier optima arrived higher up. Despite previous assertions suggesting a dominance of environmental filtering, our results demonstrate that nonrandom dispersal may be an important driver of early successional riparian vegetation zonation and biodiversity patterns as well. 4. Synthesis: Our results demonstrate (and quantify) the strong roles of both environmental and dispersal filtering in determining plant community assemblies in early successional dynamic habitats. Furthermore, we demonstrate that dispersal filtering can already initiate vegetation gradients, a mechanism that may have been overlooked along many environmental gradients where interspecific interactions are (temporarily) reduced.
    Contrasting the roles of section length and instream habitat enhancement for river restoration success: a field study on 20 European restoration projects
    Hering, D. ; Aroviita, J. ; Baattrup-Pedersen, A. ; Brabec, K. ; Buijse, T. ; Ecke, F. ; Friberg, N. ; Gielczewski, Marek ; Januschke, K. ; Köhler, J. ; Kupilas, Benjamin ; Lorenz, A.W. ; Muhar, S. ; Paillex, Amael ; Poppe, Michaela ; Schmidt, T. ; Schmutz, S. ; Vermaat, J. ; Verdonschot, R.C.M. ; Verdonschot, P.F.M. ; Wolter, Christian ; Kail, J. - \ 2015
    Wageningen UR
    aquatic macrophytes - benthic invertebrates - fish - floodplain - flow patterns - food web - ground beetles - riparian vegetation - stable isotopes
    1. Restoration of river hydromorphology often has limited detected effects on river biota. One frequently discussed reason is that the restored river length is insufficient to allow populations to develop and give the room for geomorphologic processes to occur. 2. We investigated ten pairs of restored river sections of which one was a large project involving a long, intensively restored river section and one represented a smaller restoration effort. The restoration effect was quantified by comparing each restored river section to an upstream non-restored section. We sampled the following response variables: habitat composition in the river and its floodplain, three aquatic organism groups (aquatic macrophytes, benthic invertebrates and fish), two floodplain-inhabiting organism groups (floodplain vegetation, ground beetles), as well as food web composition and land–water interactions reflected by stable isotopes. 3. For each response variable, we compared the difference in dissimilarity of the restored and nearby non-restored section between the larger and the smaller restoration projects. In a second step, we regrouped the pairs and compared restored sections with large changes in substrate composition to those with small changes. 4. When comparing all restored to all non-restored sections, ground beetles were most strongly responding to restoration, followed by fish, floodplain vegetation, benthic invertebrates and aquatic macrophytes. Aquatic habitats and stable isotope signatures responded less strongly. 5. When grouping the restored sections by project size, there was no difference in the response to restoration between the projects targeting long and short river sections with regard to any of the measured response variables except nitrogen isotopic composition. In contrast, when grouping the restored sections by substrate composition, the responses of fish, benthic invertebrates, aquatic macrophytes, floodplain vegetation and nitrogen isotopic composition were greater in sections with larger changes in substrate composition as compared to those with smaller changes. 6. Synthesis and applications. The effects of hydromorphological restoration measures on aquatic and floodplain biota strongly depend on the creation of habitat for aquatic organisms, which were limited or not present prior to restoration. These positive effects on habitats are not necessarily related to the restored river length. Therefore, we recommend a focus on habitat enhancement in river restoration projects.
    Natural foreshores as an alternative to traditional dike re-enforcements: a field pilot in the large shallow lake Markermeer, The Netherlands
    Penning, W.E. ; Steetzel, H.J. ; Santen, R. van; Fiselier, J. ; Lange, H.J. de; Vuik, V. ; Ouwerkerk, S. ; Thiel de Vries, J.S.M. van - \ 2015
    In: E-proceedings of the 36th IAHR World Congress. - 2015 : - 4
    nature development - flood control - dykes - riparian vegetation - coasts - hydrodynamics - natuurontwikkeling - hoogwaterbeheersing - dijken - oevervegetatie - kusten - hydrodynamica
    Natural foreshores are shallow zones and beaches with a gradual slope and a (near-)natural vegetation that can be used
    as an additional protection against flooding by reducing the wave attack on existing dikes, or can even completely
    replace an existing dike system. In order to test the applicability of this concept a 500 m long pilot section of a sandy
    foreshore was constructed along an already existing dike in the large shallow lake Markermeer, the Netherlands. The
    pilot was equipped with permanent monitoring equipment for hydrodynamics and meteorological conditions and monthly
    surveys of the morphology of the pilot section. These measurements will be carried out for the coming four years. This
    paper presents the first results after the construction and the first winter season with the pilot in place.
    Effects of flow alteration on Apple-ring Acacia (Faidherbia albida) stands, Middle Zambezi floodplains, Zimbabwe
    Gope, E.T. ; Sass-Klaassen, U.G.W. ; Irvine, K. ; Beevers, L. ; Hes, E.M. - \ 2015
    Ecohydrology 8 (2015)5. - ISSN 1936-0584 - p. 922 - 934.
    tree-rings - riparian vegetation - riverine ecosystems - growth - agroforestry - woodlands - ethiopia - regimes
    The impounding of the Zambezi River by Kariba dam has regulated the river discharge of the Middle Zambezi river. This has been implicated in the failure of regeneration of Faidherbia albida in the downstream flood plain. This study aimed (1) to assess the effect of the altered flow regime of the river on the establishment and growth of F. albida on the Middle Zambezi floodplain and islands and (2) to test the potential of dendrochronology in detecting the age and long-term growth rates of F. albida in response to flow regime. Results indicated an uneven age distribution of F. albida stands on relatively ‘new islands’, dominated by young trees, while the floodplain and the ‘old island’ exhibited an even-aged stand but with a lack of regeneration, and a dying-off of older trees. The lack of F. albida establishment on the floodplain was linked to the decreased occurrence of flooding events, associated with a decrease in alluvial deposits, soil moisture and groundwater recharge. These effects may be enhanced by impact from browsers on regeneration of trees. Tree-ring analyses revealed the presence of distinct annual growth rings in F. albida and the applicability of dendrochronology for estimating F. albida population dynamics. The trees on the ‘new islands’ are younger and grow faster than those on the floodplain. Lack of competition and possible favourable moisture conditions suggest beneficial conditions for establishment and growth of the trees on the islands.
    The ecology and psychology of agri-environment schemes
    Dijk, W.F.A. van - \ 2014
    Wageningen University. Promotor(en): Geert de Snoo; Frank Berendse, co-promotor(en): Anne Marike Lokhorst; Jasper van Ruijven. - Wageningen : Wageningen University - ISBN 9789462570078 - 110
    slootkanten - oevervegetatie - vegetatiebeheer - soortenrijkdom - agrarisch natuurbeheer - subsidies - houding van boeren - ecologie - psychologie - ditch banks - riparian vegetation - vegetation management - species richness - agri-environment schemes - subsidies - farmers' attitudes - ecology - psychology
    Het agrarisch natuurbeheer in slootkanten staat centraal, met als doel de diversiteit aan plantensoorten langs slootkanten toe te laten nemen. De afgelopen tien jaar hebben namelijk verschillende onderzoeken aangetoond dat tot nu toe de effectiviteit van agrarisch natuurbeheer beperkt is geweest. In dit proefschrift is zowel vanuit ecologisch als psychologisch perspectief onderzocht welke factoren het resultaat van het agrarisch natuurbeheer hebben beperkt.
    Morphological processes in lowland streams : implications for stream restoration
    Eekhout, J.P.C. - \ 2014
    Wageningen University. Promotor(en): Remko Uijlenhoet; Piet Verdonschot, co-promotor(en): Ton Hoitink. - Wageningen : Wageningen University - ISBN 9789461739117 - 168
    waterlopen - hydrologie - laaglandgebieden - waterbeheer - herstelbeheer - oevervegetatie - streams - hydrology - lowland areas - water management - restoration management - riparian vegetation
    Waterschappen in Nederland zijn constant op zoek naar kostenefficiënte alternatieven voor beekherstel. Eén van deze methoden is het verwijderen van oeverbeschoeiing, vervolgens zouden autogene morfologische processen een kronkelende loop moeten vormen. In een grootschalig veldexperiment (Hooge Raam) zijn deze morfologische processen onderzocht. De invloed van exogene processen op de initiatie van meandering zijn in detail bestudeerd in het Gelderns-Nierskanaal. In de Lunterse beek speelden stuweffecten een subtstantiële rol in de morfologische ontwikkelingen die uiteindelijk tot een bochtafsnijding hebben geleid. De term ’hermeandering´ is misleidend, vanwege de suggestie dat laaglandbeken de kenmerken zouden hebben van actief meanderende rivieren. Dit onderzoek heeft zich met name gericht op korte morfologische tijdschalen vanwege de relevantie voor het Nederlandse waterbeheer.
    Linking landscape morphological complexity and sediment connectivity
    Baartman, J.E.M. ; Masselink, R. ; Temme, A.J.A.M. ; Keesstra, S.D. - \ 2013
    Earth Surface Processes and Landforms 38 (2013)12. - ISSN 0197-9337 - p. 1457 - 1471.
    drainage-basin evolution - small alpine catchments - land-use change - hydrological connectivity - surface-roughness - delivery problem - mesoscale catchment - riparian vegetation - fluvial dynamics - cellular-model
    Connectivity relates to the coupling of landforms (e.g. hillslopes and channels) and the transfer of water and sediment between them. The degree to which parts of a catchment are connected depends largely on the morphological complexity of the catchment's landscape. Landscapes can have very different and distinct morphologies, such as terraces, V-shaped valleys or broad floodplains. The objective of this study is to better understand and quantify the relation between landscape complexity and catchment connectivity. We hypothesize that connectivity decreases with increasing landscape morphological complexity. To quantify the connectivity–complexity relationship virtual digital elevation models (DEMs) with distinct morphologies were used as inputs into the landscape evolution model LAPSUS to simulate the sediment connectivity of each landscape. Additionally, the hypothesis was tested on six common real DEMs with widely different morphologies. Finally, the effects of different rainfall time series on catchment response were explored. Simulation results confirm the hypothesis and quantify the non-linear relation. Results from the exploration of sediment connectivity in response to sequences of rainfall events indicate that feedback between erosion and deposition are more important for certain landscape morphologies than for others: for a given rainfall input, a more effective sediment connectivity and erosion response may be expected from rolling or V-shaped catchments than from dissected or stepped landscapes. Awareness of the differences in the behaviour and response of different morphologies to catchment processes provides valuable information for the effective management of landscapes and ecosystems through efficiently designed soil and water conservation measures
    Mitigatie van effecten van uitheemse grondels: kansen voor natuurvriendelijke oevers en uitgekiende kunstwerken
    Kessel, N. van; Kranenbarg, J. ; Dorenbosch, M. ; Bruin, A. de; Nagelkerke, L.A.J. ; Velde, G. van der; Leuven, R.S.E.W. - \ 2013
    Nijmegen : Instituut voor Water en Wetland Research, Radboud Universiteit (Verslagen Milieukunde 436) - 88
    invasieve soorten - gobio gobio - fauna - vissen - habitats - oevervegetatie - aquatische ecologie - invasive species - gobio gobio - fauna - fishes - habitats - riparian vegetation - aquatic ecology
    Het afgelopen decennium zijn de Nederlandse rivieren in hoog tempo gekoloniseerd door vier Ponto-Kaspische grondelsoorten, namelijk de marmergrondel (Proterorhinus semilunaris), zwartbekgrondel (Neogobius melanostomus), Kesslers grondel (Ponticola kessleri) en Pontische stroomgrondel (Neogobius fluviatilis). Deze uitheemse grondels zijn invasieve vissen met een bodemgebonden levenswijze en kunnen plaatselijk in hoge dichtheden voorkomen. Hoewel de verspreidingpatronen van invasieve grondels in Nederland tot op heden grofweg bekend zijn, bestaat geen duidelijk inzicht in de verspreidingprocessen en dichtheden van de grondels in verschillende watertypen, hun (ecologische) effecten en kansrijke mogelijkheden om ongewenste effecten te beperken.
    Effectiviteit KRW herstelmaatregelen in de rijkswateren. Analyserapport meestromende nevengeulen en eenzijdig aangetakte strangen
    Kouwen, L. van; Dionisio Pires, M. ; Geest, G. van; Riel, M.C. van - \ 2011
    Delft : Deltares (1204157-001 ) - 89
    oevervegetatie - oeverecologie - hydrologie van stroomgebieden - morfologie - literatuuroverzichten - oeverbescherming van rivieren - onderhoud - natuurontwikkeling - riparian vegetation - riparian ecology - catchment hydrology - morphology - literature reviews - riverbank protection - maintenance - nature development
    Met de komst van de KRW (EP 2000) en stroomgebiedbeheersplannen met bijbehorende maatregelpakketten is er veel aandacht voor de wijze waarop maatregelen uitgevoerd kunnen worden. Vragen die hierbij centraal staan zijn: welke inrichting levert het hoogste ecologische rendement en hoe kunnen beheer en onderhoud tot een minimum beperkt worden? In opdracht van Rijkswaterstaat voert Deltares daarom studies uit die gericht zijn op de ontwikkeling en montage van kennis over de ecologische effectiviteit van maatregelen in Rijkswateren, in samenhang met hydromorfologische stuurvariabelen. De hier besproken studie wordt in 3 delen opgesplitst: - een oevertypologie aan de hand van bestaande natuurvriendelijke oeverconstructies; - een literatuuronderzoek naar de huidige kennis met betrekking tot (ecologisch effectieve) inrichting van natuurvriendelijke oevers; - een literatuuronderzoek naar de huidige kennis met betrekking tot beheer en onderhoud.
    Comparison of leaf decomposition and macroinvertebrate colonization between exotic and native trees in a freshwater ecosystem
    Alonso, A. ; Gonzalez-Munoz, N. ; Castro-Diez, P. - \ 2010
    Ecological Research 25 (2010)3. - ISSN 0912-3814 - p. 647 - 653.
    alien plant invasions - riparian vegetation - litter decomposition - streams - shredders - breakdown - rates - invertebrates - communities - habitats
    One of the most important sources of energy in aquatic ecosystems is the allochthonous input of detritus. Replacement of native tree species by exotic ones affects the quality of detritus entering freshwater ecosystems. This replacement can alter nutrient cycles and community structure in aquatic ecosystems. The aims of our study were (1) to compare leaf litter decomposition of two widely distributed exotic species (Ailanthus altissima and Robinia pseudoacacia) with the native species they coexist with (Ulmus minor and Fraxinus angustifolia), and (2) to compare macroinvertebrate colonization among litters of the invasive and native species. Litter bags of the four tree species were placed in the water and collected every 2, 25, 39, 71, and 95 days in a lentic ecosystem. Additionally, the macroinvertebrate community on litter bags was monitored after 25, 39, and 95 days. Several leaf chemistry traits were measured at the beginning (% lignin; lignin:N, C:N, LMA) and during the study (leaf total nitrogen). We detected variable rates of decomposition among species (k values of 0.009, 0.008, 0.008, and 0.005 for F. angustifolia, U. minor, A. altissima and R. pseudoacacia, respectively), but we did not detect an effect of litter source (from native/exotic). In spite of its low decay, the highest leaf nitrogen was found in R. pseudoacacia litter. Macroinvertebrate communities colonizing litter bags were similar across species. Most of them were collectors (i.e., they feed on fine particulate organic matter), suggesting that leaf material of either invasive or native trees was used as substrate both for the animals and for the organic matter they feed on. Our results suggest that the replacement of the native Fraxinus by Robinia would imply a reduction in the rate of leaf processing and also a slower release of leaf nitrogen to water.
    Van griend naar hoog kwalitatief ooibos : verslag veldwerkplaats rivierenlandschap, Hank, 27 april 2010
    Weeda, E.J. ; Sluiter, H. - \ 2010
    [S.l.] : S.n. - 4
    oevervegetatie - bossen - zachthout - vegetatiebeheer - natuurbeheer - uiterwaarden - riparian vegetation - forests - softwoods - vegetation management - nature management - river forelands
    De veldwerkplaats heeft een wat andere opzet dan gebruikelijk. De inleidingen vinden pas plaats in het veld zelf, op de boot om precies te zijn. Excursieleider Weeda wil namelijk vooral ter plaatse laten zien wat een zachthoutooibos is. Hij wil in het veld laten zien hoe een ontwikkeld ooibos er uit kan zien en welke stadia je vanuit de nulsituatie zult doorlopen om uiteindelijk dat mooie ooibos te krijgen.
    Koningsdiep Beekdalsysteemherstel: uitgangspunten en aanpak
    Verdonschot, Piet - \ 2010
    soil - hydrology - vegetation - riparian vegetation - ecosystems - ecological restoration - brook valleys - friesland
    Visstandbeheer : verslag veldwerkplaats laagveen- en zeekleilandschap en rivierenlandschap Wieden, 28 augustus 2008
    Haan, B. de; Ottburg, F.G.W.A. ; Klinge, M. - \ 2008
    [S.l. : S.n. - 5
    waterkwaliteit - visbestand - doelstellingen - oevervegetatie - visstand - natuurbeheer - water quality - fishery resources - objectives - riparian vegetation - fish stocks - nature management
    De visstand heeft mede door de Kaderrichtlijn Water (KRW) en Natura 2000 de afgelopen jaren meer belangstelling gekregen. Sommigen vissoorten zijn doelsoort, maar daarnaast is er een belangrijk verband tussen de visstand en waterkwaliteit.
    Tjeukemeer en Huitebuursterbuitenpolder
    Weeda, E.J. - \ 2008
    In: Excursieverslagen 2002 Wageningen : Plantensociologische Kring Nederland (Excursieverslagen Plantensociologische Kring Nederland 2008) - p. 12 - 15.
    oevervegetatie - plantengemeenschappen - vegetatie - friesland - riparian vegetation - plant communities - vegetation
    Habitat variation and life history strategies of benthic invertebrates
    Franken, R.J.M. - \ 2008
    Wageningen University. Promotor(en): Marten Scheffer, co-promotor(en): Edwin Peeters. - [S.l.] : S.n. - ISBN 9789085048688 - 158
    waterinvertebraten - benthos - waterlopen - milieufactoren - zoetwaterecologie - habitats - levensgeschiedenis - snelheid - substraten - gammarus pulex - plecoptera - oevervegetatie - aquatic invertebrates - benthos - streams - environmental factors - freshwater ecology - habitats - life history - velocity - substrates - gammarus pulex - plecoptera - riparian vegetation
    The thesis considers two key aspects of lotic freshwater ecosystems, the physical microhabitat and organic matter dynamics. The first part focuses on the indirect effects of light and riparian canopy cover on shredder growth and productivity through the effect on the nutritional quality of the food source. The second part addresses the nature of differences in response to physical habitat structure and current velocity in common species of shredders. Three invertebrate shredder-detritivore species were selected as study organisms: the freshwater shrimp Gammarus pulex, the freshwater louse Asellus aquaticus and the stonefly Nemoura cinerea
    Veiligheid en beheer van natuurgebieden in 'Ruimte voor de Rivier'
    Makaske, B. ; Maas, G.J. - \ 2007
    Wageningen : Alterra (Alterra-rapport 1624) - 36
    rivieren - inundatie - waterbeheer - waterbouwkunde - hoogwaterbeheersing - natuurbescherming - geologische sedimentatie - oevervegetatie - vegetatie - plantensuccessie - kosten - economische analyse - natuurtechniek - uiterwaarden - rivers - flooding - water management - hydraulic engineering - flood control - nature conservation - geological sedimentation - riparian vegetation - vegetation - plant succession - costs - economic analysis - ecological engineering - river forelands
    Om de veiligheid tegen overstromingen in het rivierengebied te waarborgen is een goede doorstroomcapaciteit van het winterbed van belang. Maatregelen, zoals uiterwaardverlaging en het graven van een nevengeul, kunnen de doorstroomcapaciteit verbeteren. In deze studie is, middels een scenariostudie, de hydraulische effectiviteit van deze maatregelen op de lange termijn verkend bij verschillende natuurbeheersvormen, waarbij natuurlijke processen die de ontwikkeling van de doorstroomcapaciteit beïnvloeden, sedimentatie en vegetatiesuccessie, in de analyse zijn betrokken. Ook de ontwikkeling van natuurbeheerskosten op de lange termijn is doorgerekend. De resultaten laten zien met welke combinatie van maatregelen en beheer veiligheid en natuur op kosteneffectieve en duurzame wijze samen kunnen gaan in de bestudeerde (fictieve) situatie.
    Onderzoek naar het ecologisch functioneren van Nederlandse sloten
    Peeters, E.T.H.M. ; Klein, J.J.M. de; Scheffer, M. - \ 2007
    H2O : tijdschrift voor watervoorziening en afvalwaterbehandeling 40 (2007)6. - ISSN 0166-8439 - p. 30 - 31.
    zoetwaterecologie - sloten - slootkanten - bedrijfsvoering - oevervegetatie - waterplanten - waterkwaliteit - eutrofiëring - biodiversiteit - functionele biodiversiteit - agrobiodiversiteit - freshwater ecology - ditches - ditch banks - management - riparian vegetation - aquatic plants - water quality - eutrophication - biodiversity - functional biodiversity - agro-biodiversity
    De leerstoelgroep Aquatische Ecologie en Waterkwaliteitsbeheer van Wageningen Universiteit gaat de komende vier jaar vernieuwend onderzoek uitvoeren in sloten. Het onderzoek wordt gefinancierd door STOWA en de direct betrokken waterbeheerders. Enerzijds zal het onderzoek zich richten op het verkrijgen van meer inzicht in de fundamentele processen achter het zelfreinigend vermogen (het verwijderen van nutriënten) van slootsystemen en daarnaast probeert het verdergaand inzicht te krijgen in de manier waarop het onderhoud (met name schonen en baggeren) de ecologische kwaliteit van sloten kan verhogen. Uiteindelijk moet het onderzoek leiden tot meer inzicht in de fundamentele processen en mechanismen die een rol spelen bij het functioneren van sloten. De resultaten zullen ook handreikingen opleveren voor een beter uitgebalanceerd beheer
    Order and disorder in the river continuum: the contribution of continuity and connectivity to floodplain meadow biodiversity
    Looy, K. van; Honnay, O. ; Pedroli, B. ; Muller, S. - \ 2006
    Journal of Biogeography 33 (2006)9. - ISSN 0305-0270 - p. 1615 - 1627.
    plant-species richness - longitudinal changes - riparian vegetation - population-size - stream ecology - dispersal - patterns - diversity - dynamics - habitat
    Aim Aspects of connectivity and continuity operating in the River Meuse were analysed for their contribution to the biodiversity of the floodplain. From this analysis of the diversity and composition of the meadow communities, we aimed to derive effective biodiversity conservation strategies. Location The River Meuse is one of the larger rivers in the European Western Plains ecoregion. The alluvial plains of the river have a long history of cultivation, and for these plains the floodplain meadow vegetation is a highly appreciated and valuable nature conservation asset. Method We sampled floodplain meadows from 400 km of the six geomorphic reaches of the middle to lower course of the River Meuse. For each, 50 vascular plant relevés were recorded, representing the spectrum of floodplain meadow communities of that reach. Beta diversity was calculated to quantify similarity in species pools between the reaches. A dissimilarity formula was used to determine the turnover between the reaches, and these dissimilarities were compared with a Mantel test to detect whether species composition of the floodplain meadows exhibited connectivity and continuity between the reaches. Species richness for the floodplain vegetation data of the reaches was compared with data for riparian invertebrate communities. The vegetation data sets were ordinated using detrended correspondence analysis (DCA) to reveal patterns in the floodplain meadow species composition, and the DCA axes were related to plant functional groups and population strategies. The axis scores of the species and plots were linked to river and plant species traits. Results We did not observe an overall continuity trend in similarity, nor one in diversity in a downstream direction. Lateral connectivity was highlighted by the dissimilarity between the reaches and in the influxes of species from adjacent ecoregions. The DCA ordination showed statistically significant separations between reaches and between the plant functional groups. The second DCA axis related to the longitudinal gradient of the river, whereas the first axis showed stronger correlations with river and plant species traits. We termed this axis the 'disorder axis'. Plant invaders and avoiders are located at the left side of the disorder axis, whereas the true river-adapted categories of resisters and endurers are at the right extremity. Contributions to the disorder were identified in terms of connectivity with adjacent ecoregions and the physical disturbance regime of natural and anthropogenic perturbations, resulting in community changes between the reaches. Main conclusions We concluded that a single overall strategy for biodiversity conservation of the river or its floodplains is not feasible. Strategies can, however, be derived for separate river reaches based on functional groups in the communities, the disorder characteristics of the reach, and the influence of surrounding ecoregions.
    Alternerend maaibeheer kavelsloten, verwerking rietmaaisel en effecten op onkruiddruk
    Holshof, G. ; Boekhoff, M. - \ 2006
    Lelystad : Animal Sciences Group / Praktijkonderzoek (PraktijkRapport / Animal Sciences Group, Praktijkonderzoek : Rundvee ) - 27
    graslanden - vegetatiebeheer - oevervegetatie - maaien - agrarische bedrijfsvoering - slootkanten - agrarisch natuurbeheer - natuurontwikkeling - grasslands - vegetation management - riparian vegetation - mowing - farm management - ditch banks - agri-environment schemes - nature development
    Door in het najaar slechts één slootzijde + slootbodem te maaien en het product af te voeren, wordt de natuurwaarde van deze sloot vergroot. Dit alternerend maaibeheer leidt niet tot veronkruiding van het aangrenzende perceel. Door het rietmaaisel een jaar op te slaan, kan het vervolgens zonder problemen worden uitgereden op maïsland op zeeklei. Het uitrijden van rietmaaisel leidt niet tot een verhoogde onkruiddruk of opbrengstdaling.
    Aantrekkelijk en fleurig zonder areaalverlies : Attractieve oeverinrichting : onderzoek natuurontwikkeling
    Balkenende, P. ; Reijers, N. - \ 2005
    BloembollenVisie (2005)63. - ISSN 1571-5558 - p. 22 - 23.
    oevervegetatie - sloten - kanaaloeverbeplantingen - bloembollen - landschapsecologie - natuurtechniek - natuurlandschap - bollenstreek - akkerranden - riparian vegetation - ditches - canal plantations - ornamental bulbs - landscape ecology - ecological engineering - natural landscape - bollenstreek - field margins
    De druk op de ruimte in de Duin- en Bollenstreek is groot. Mede hierdoor vindt natuurontwikkeling maar sporadisch plaats. PPO Bloembollen onderzoekt komende jaren de mogelijkheden van het gebruik van oeverbeplantingen langs sloten van bollenpercelen. Verschillende inrichtingsvarianten worden zo aangelegd dat er geen areaalverlies optreedt maar wel een fleurige en aantrekkelijke slootkant ontstaat. Het bollenlandschap wordt daardoor jaarrond attractief voor telers, burgers, toeristen en recreanten
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