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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Biobased performance materials in a circular economy
Bolck, Christiaan - \ 2018
biobased economy - biobased materials - biomass - renewable energy
Christiaan Bolck (Biobased Performance Materials): ‘We doen onderzoek dat impact heeft’
Bolck, Christiaan - \ 2018
biobased economy - biobased materials - biomass - polymers - bioplastics - dyes - pigments - paints - plant extracts
Er is nog veel te winnen
Thoden van Velzen, Ulphard ; Molenveld, Karin ; Hugenholtz, Jeroen - \ 2018
biobased economy - recycling - biobased materials - biomass - residual streams - agricultural wastes - biofuels - bioenergy

Willen we ons huishoudelijk afval optimaal benutten, dan moeten we de grondstoffen erin efficiënter scheiden en terugwinnen. 'We zijn nog ver verwijderd van het ideale, circulaire beeld.'

Praktijkonderzoek bioraffinage
Doorn, Wim van; Baars, J.J.P. ; Dam, J.E.G. van; Keijsers, E.R.P. ; Yilmaz, G. - \ 2018
Amersfoort : Stichting Toegepast Onderzoek Waterbeheer (STOWA rapport 2018-25) - ISBN 9789057737930 - 59
waterbeheer - bioraffinage - materialen uit biologische grondstoffen - biomassa - waterplanten - reststromen - water management - biorefinery - biobased materials - biomass - aquatic plants - residual streams
Waterschappen en andere waterbeheerders zien dat de laatste jaren in toenemende mate inspanningen nodig zijn om problemen door uitheemse en/of invasieve plantensoorten in het waterbeheer te beheersen. Echte oplossingen zijn nog steeds niet beschikbaar. Tegelijkertijd werken de waterschappen samen met andere gebiedsbeheerders en ketenpartners aan verduurzaming van het waterbeheer, onder meer door bij te dragen aan een meer circulaire economie, en aan realisatie van de Kader Richtlijn Water doelstellingen. In dit project is onderzocht hoe bioraffinage kan bijdragen aan deze verduurzaming, door het produceren van diverse nuttige grondstoffen uit groenresten van het waterbeheer. Daarbij lag de nadruk op het verwaarden van woekerende waterplanten en oevermaaisels via kleinschalige, mobiele bioraffinage. Daarbij worden op de plaats ter waar maaisels vrijkomen via een bioraffinage machine de planten opgewerkt tot diverse producten, zoals eiwitten (voor diervoer of technische toepassingen), vezels (voor diervoeder, papier/karton of biocomposiet), mineralenconcentraat (meststof) en eventueel substraat voor vergisting tot biogas. Loosbaar water is wat overblijft en terug kan naar het aquatisch milieu.
Europese alternatieve bron voor natuurrubber
Meer, I.M. van der - \ 2018
Topsector Tuinbouw en Uitgangsmaterialen - 2 p.
biobased economy - biomass - biobased materials - rubber - taraxacum officinale
Natuurrubber is onmisbaar voor de samenleving. De toekomstige vraag zal echter veel groter zijn dan het huidige aanbod. Bijna al het rubber is bovendien afkomstig van, kwetsbare, plantages uit Zuidoost-Azië. In dit project werken we aan een veelbelovend Europees alternatief voor de productie van natuurrubber: de Russische paardenbloem.
Toine Timmermans: ‘Ik pleit voor grootschalige inzet reststromen’
Timmermans, Toine - \ 2018
residual streams - biomass - nutrition - agricultural wastes - animal health - animal welfare - animal production
Bioplastic uit geur van salie
Jongedijk, Esmer - \ 2018
biomass - biobased materials - bioplastics - sage
Laccase-Mediated Grafting on Biopolymers and Synthetic Polymers : A Critical Review
Slagman, Sjoerd ; Zuilhof, Han ; Franssen, Maurice C.R. - \ 2018
ChemBioChem 19 (2018)4. - ISSN 1439-4227 - p. 288 - 311.
biomass - enzyme catalysis - grafting - polymers - surface chemistry
Laccase-mediated grafting on lignocelluloses has gained considerable attention as an environmentally benign method to covalently modify wood, paper and cork. In recent decades this technique has also been employed to modify fibres with a polysaccharide backbone, such as cellulose or chitosan, to infer colouration, antimicrobial activity or antioxidant activity to the material. The scope of this approach has been further widened by researchers, who apply mediators or high redox potential laccases and those that modify synthetic polymers and proteins. In all cases, the methodology relies on one- or two-electron oxidation of the surface functional groups or of the graftable molecule in solution. However, similar results can very often be achieved through simple deposition, even after extensive washing. This unintended adsorption of the active substance could have an adverse effect on the durability of the applied coating. Differentiating between actual covalent binding and adsorption is therefore essential, but proves to be challenging. This review not only covers excellent research on the topic of laccase-mediated grafting over the last five to ten years, but also provides a critical comparison to highlight either the lack or presence of compelling evidence for covalent grafting.
De toekomst van hout in de biobased economy
Annevelink, E. ; Harmsen, P.F.H. ; Spijker, J.H. - \ 2018
Vakblad Natuur Bos Landschap 15 (2018)141. - ISSN 1572-7610 - p. 7 - 11.
biobased economy - hout - biobrandstoffen - biomassa - hernieuwbare energie - materialen uit biologische grondstoffen - cellulose - lignine - vezels - wood - biofuels - biomass - renewable energy - biobased materials - lignin - fibres
De laatste jaren is de biobased economy sterk gegroeid door allerlei activiteiten, variërend van fundamenteel onderzoek naar nieuwe biobased toepassingen, tot het op commerciële schaal vervaardigen van biobased producten. Welke kansen biedt dit voor hout en houtige biomassa en wat zijn de verwachte effecten op de houtmarkt?
Supplementary material from "Increased SBPase activity improves photosynthesis and grain yield in wheat grown in greenhouse conditions"
Driever, S.M. ; Simkin, Andrew J. ; Alotaibi, Saqer ; Fisk, Stuart J. ; Madgwick, Pippa J. ; Sparks, Caroline A. ; Jones, Huw D. ; Lawson, Tracy ; Parry, Martin A.J. ; Raines, Christine A. - \ 2017
sedoheptulose-1 - 7-biphosphatase - Calvin-Benson cycle - transgenic - biomass - yield
To meet the growing demand for food, substantial improvements in yields are needed. This is particularly the case for wheat, where global yield has stagnated in recent years. Increasing photosynthesis has been identified as a primary target to achieve yield improvements. To increase leaf photosynthesis in wheat, the level of the Calvin–Benson cycle enzyme sedoheptulose-1,7-biphosphatase (SBPase) has been increased through transformation and expression of a Brachypodium distachyon SBPase gene construct. Transgenic lines with increased SBPase protein levels and activity were grown under greenhouse conditions and showed enhanced leaf photosynthesis and increased total biomass and dry seed yield. This showed the potential of improving yield potential by increasing leaf photosynthesis in a crop species such as wheat. The results are discussed with regards to future strategies for further improvement of photosynthesis in wheat.This article is part of the themed issue ‘Enhancing photosynthesis in crop plants: targets for improvement’.
A New Value Chain for Rubber and Inulin Production in the European BioEconomy
Hingsamer, Maria ; Beerman, M. ; Jungmeier, Gerfried ; Meer, I.M. van der; Dijk, P. van; Muylle, Hilde ; Kirschner, Jan ; Kappen, F.H.J. ; Gevers, N. - \ 2017
biobased economy - biobased materials - biomass - rubber - taraxacum kok-saghyz - inulin
DRIVE4EU - ‘Dandelion Rubber and Inulin Valorization and Exploitation for Europe’, a European demonstration project sets up a European chain for the production and processing of natural rubber and inulin from Taraxacum koksaghyz (TKS, Rubber dandelion) to become less dependent on the import of natural rubber. Natural rubber is a sustainable material that is used for more than 40,000 products, e.g. natural rubber is applied in construction (adhesives, sealants), medicine (gloves, tubing) and transportation (matting, tyres) industries. Because of the specific quality aspects of natural rubber in many products it cannot be replaced by synthetic rubber. At the moment natural rubber is exclusively harvested from the rubber tree (Hevea brasiliensis) of which about 90% is grown in South East Asia.
Final report: Environmental assessment of algae-based PUFA production
Keller, H. ; Reinhardt, G. ; Rettenmaier, N. ; Schorb, A. ; Dittrich, M. ; Wolf, P.L. de; Voort, M.P.J. van der; Spruijt, J. ; Potters, J.I. ; Elissen, H.J.H. - \ 2017
Heidelberg : PUFAChain - 94 p.
algae - biofuels - bioenergy - biobased economy - biomass - omega-3 fatty acids - plant oils - biobased chemistry - fermentation
Socio-economic assessment of Algae-based PUFA production : The value chain from microalgae to PUFA ('PUFACHAIN')
Voort, M.P.J. van der; Spruijt, J. ; Potters, J.I. ; Elissen, H.J.H. - \ 2017
Göttingen : PUFAChain - 84 p.
biobased economy - biomass - bioenergy - biofuels - algae - plant oils - omega-3 fatty acids - economic analysis
Socio-economic assessment of Algae-based PUFA production
Voort, Marcel van der; Spruijt, Joanneke ; Potters, Jorieke ; Wolf, Pieter de; Elissen, Hellen - \ 2017
Göttingen : PUFAChain - 84
bioenergy - biobased economy - biofuels - biomass - algae - fatty acids - bio-energie - biobrandstoffen - biomassa - algen - vetzuren
Biobased materialen, circulaire economie en natuurlijk kapitaal
Overbeek, M.M.M. ; Smeets, E.M.W. ; Verhoog, A.D. - \ 2017
Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu (WOt-technical report 109) - 37
biomassa - biobased economy - materialen uit biologische grondstoffen - bioplastics - hernieuwbare energie - duurzaamheid (sustainability) - biobrandstoffen - recycling - chemie op basis van biologische grondstoffen - biomass - biobased materials - renewable energy - sustainability - biofuels - biobased chemistry
This preliminary study investigates the amount of biomass that would be needed in the Netherlands to replace the fossil raw materials used in the manufacture of plastics and how this transition to biobased plastics can be achieved. It is based on desk research and calculations of the area of agricultural land that would be needed to produce sufficient biobased material to meet Dutch demand for biobased plastics. In addition, interviews were held with experts on the institutional obstacles to such a transition. Far too little agricultural land is available in the Netherlands to produce the required amount of biomass needed to replace fossil plastics. Research with the aim of increasing the contribution made by biobased materials to the circular economy should focus on assessing the options for producing sustainable raw materials and on a comprehensive assessment of the sustainable use of biomass in various applications.
Circular food chains and cascading of biomass in metropolitan regions : Vision on metropolitan biorefinery concepts in relation to resource-efficient cities
Annevelink, E. ; Gogh, J.B. ; Groot, J.J. - \ 2017
Wageningen : Wageningen Food & Biobased Research (Wageningen Food & Biobased Research report 1790) - ISBN 9789463437424 - 18
biomass - bioenergy - residual streams - refining - biofuels - biobased economy - biogas - biomassa - bio-energie - reststromen - raffineren - biobrandstoffen
Expectations are that 80 percent of the global population will reside in urban areas by the year 2050. As urbanisation levels increase so do ecological footprint sizes in these areas, as it is in the cities that income levels are higher, and where higher levels of disposable incomes exist. Whereas the circular economy is gaining ground as a concept for increasing sustainability by the efficient use of available materials and resources, urban areas are often recognised as attractive starting points for making the transition towards a circular economy. The paper “Circular food chains and cascading of biomass in metropolitan regions” contains the description of a vision on how biorefinery concepts in current and future metropoles may contribute to the increased efficiency in the use of resources for biomass production. As such this vision forms the interpretation of the principles of the circular economy within the context of biomass value chains and within the geographic boundaries of a metropolitan region. This is also referred to as the circular metropolitan system. With this paper researchers from Wageningen Food & Biobased Research intend to contribute to a scientific basis for increasing resource use efficiency in metropolitan regions through developing appropriate and sustainable biorefinery concepts.
Photosynthesis : Online introductory course
Vreugdenhil, D. - \ 2017
Wageningen : Wageningen University & Research
photosynthesis - plants - plant physiology - biomass - fotosynthese - planten - plantenfysiologie - biomassa
The aim of this online course is to explain the basic mechanisms of photosynthesis.
Fermentatie is hot: nieuwe toepassingen van een oeroude techniek
Smid, Eddy ; Hugenholtz, Jeroen - \ 2017
biofuels - biobased economy - bioenergy - chemical industry - nutrition - fermentation - cellulose - bacteria - biomass
Valorisation of waste streams from by-product to worm biomass
Laarhoven, Bob - \ 2017
University. Promotor(en): Cees Buisman, co-promotor(en): Hardy Temmink; Hellen Elissen. - Wageningen : Wageningen University - ISBN 9789463438117 - 141
biomass - residual streams - animal nutrition - fisheries - organic wastes - helminths - biomassa - reststromen - diervoeding - visserij - organisch afval - wormen

There is a global demand for more feed resources to keep up with the increasing production of livestock. The hunger for resources is most urgent in the aquaculture sector, which to a large degree depends on the non-sustainable use of fish oil/ meal from wild fish. Aquatic macro invertebrates such as the freshwater worm Lumbriculus variegatus (Oligochaeta, Lumbriculidae, common name blackworms, further abbreviated as Lv) are rich in proteins, lipids, vitamins and minerals. When cultivated on safe and low-grade organic wastes they can provide a sustainable fishmeal alternative for most freshwater and marine fish.

Chapter 1 introduces the concept of aquatic worm production on waste streams. Worm biomass composition and relevant research lines are explained. Organic waste sludges from food industries are a rich source of bio-molecules and can be upgraded to (fish) feed when fed to aquatic worms. For valorisation of waste streams by aquatic worms, as proposed in this thesis, these streams preferably are free from contaminants such as organic micro pollutants, heavy metals and pathogens. For example, this would not be the case when sewage (municipal) sludge is used as a substrate for the worms. However, such contaminated sludges may still be applied for non-food applications. Thus, the quality of the waste stream that is used as a substrate for the worms determines the application potential of the worm biomass as well as the options for downstream processing and refinery.

Previous research showed that Lv can be used for reduction and compaction of sewage sludge. The consumption of (suspended) sludge particles results in a dry matter reduction of 25 - 50 % and in worm faeces that are 60 % more compact than the original waste sludge. This contributes to a significant reduction in sludge processing costs. Sludge reduction by aquatic worms is mainly studied by research groups in The Netherlands and in China. Unfortunately, it is generally accepted free swimming worms in full-scale wastewater treatment plants is extremely difficult, mainly because of large (seasonal) population fluctuations. A controlled reactor concept applying the sessile (crawling, sediment dwelling) species Lv already was developed in earlier research. The key characteristic of this reactor is a carrier material for the worms, which also functions as a separation layer between the waste stream (worm food) and a water phase used for aeration, worm harvesting and worm faeces collection. This concept also was the starting point for the development of the improved reactor concept that is described in this thesis.

The two main objectives of this thesis were: (1) to assess the potential of organic waste streams and by-products for Lv production for fish feed and (2) to develop a (cost and resource) effective bioreactor for this purpose.

In Chapter 2 a new, standardized method is described and tested that can be used for a quantitative and qualitative assessment of the effect of different substrates on worm growth. This method not only can be used to select waste streams suitable for worm production, but also is proposed as a tool is ecotoxicology studies.

The test method consists of beaker experiments with a combination of agar and sand to optimize food uptake by and growth of the worms. The effects of agar gel, sand, and food quantity were studied and evaluated for different food sources. Agar gel addition ameliorated growth conditions by reducing microbial food hydrolysis and by improving the sediment structure. This guaranteed that substrate ingestion and worm growth in the first place were the result of the food quality and the effect of other (environmental) factors was reduced. A final test with secondary potato starch sludge demonstrated the test method is appropriate for the evaluation of solid and suspended organic feedstuffs/waste streams.

In Chapter 3 the standardized method of chapter 2 was used for worm growth studies, focussing on the effect of carbon to nitrogen (C/N) ratios of diets on worm growth and reproduction. Growth and reproduction of Lv on different combinations of wheat based derivatives like gluten and gray starch was studied at fixed isoenergetic levels (expressed as chemical oxygen demand (COD) of the food), but at different C/N ratios. Growth and reproduction rates were compared to those on Tetramin, a substrate known to result in excellent worm growth. Growth was mainly controlled by the C/N ratio of the single and mixed wheat fraction diets. Lower C/N ratios of around 6-7 gave a much better performance than high C/N ratios of around 20. This probably was caused by Lv relying on the presence of proteins as carbon and energy source. Although growth and reproduction rates were not as high as on the control diet, the results were promising for development of a worm biomass production reactor, operating on by-products from wheat processing industries.

In Chapter 4 a new reactor concept for Lv cultivation on waste streams was developed and tested. In a vertical tubular reactor a centralized food compartment was surrounded by a gravel layer that mimicked the natural habitat of Lv. Secondary (biological) sludge from a potato starch processing industry was used as a clean and low value food source. The results with respect to worm growth rate, density and production and nutrient recovery were compared to the previous reactor design. Much higher worm densities were achieved (6.0 compared to 1.1 kg ww m-2 carrier material) as well as much faster Lv growth rates (4.4 - 12 compared to 1.2 % d-1). As a result the areal worm production rate was no less than 40 times higher (560 compared to 14 g ww m-2 d-1). The higher worm density, which was found to be independent of gravel size in a range of 2.4 to 8.0 mm, allowed for a significantly shorter food retention time in the reactor (~ 2.2 days compared to > 10 days for the previous reactor design). This restricted microbial mineralization of the food, making high nutrient recoveries from waste to worm biomass possible: 16-30 % COD, 19-22 % N and 9-11 % P. The high biomass density also limited the release of ammonium, which at large concentrations is toxic for the worms. However, even shorter food retention times (e.g. higher loading rates) are not recommended as a minimum microbial activity is needed for conversion of the original substrate into compounds that can be taken up by the worms.

In Chapter 5 worm growth, reproduction and biomass quality were evaluated on several waste streams and by-products of bacterial, animal and plant origin. The effect of 26 different diets, all applied at high food levels, on Lv growth, reproduction and fatty acid (FA) content and profile were investigated. For this purpose the standardized test method of Chapter 2 was used. In addition, it was discussed which diet composition and food sources would be most suitable for large scale production of Lv.

Diets consisting of single cell biomass from bacterial or plant origin with a high protein content (C/N ratio < 8.8), high P content (C/P < 50) and low in total ammonia nitrogen (TAN) (< 20 g N/kg) gave the highest growth rates and vital worms without signs of mortality. Besides the C/P ratio of the diet, worm conditions related with the difference between test and pre-culture conditions. The starting weight of the worms seemed to have an effect on the total fatty acid content of the worms. The growth potential of a diet rich in proteins and P depends on how much TAN is associated with the diet. By blending different food sources these factors to a certain extent can be manipulated. Lv seemed to have a distinct and very stable FA composition, irrespective of the diet’s FA composition. The worms were rich in poly unsaturated FAs (PUFAs), including several w3 and w6 FAs, and contained relatively high levels of C18 and C20 PUFAs. This makes them suitable as fish feed, in particular for freshwater fish.

In order to serve aquaculture feed markets with an attractive alternative to fish meal, such as aquatic worm biomass, a continuous and secure bulk production needs to be realized. In Chapter 6 the performance parameters established in chapter 4 (worm growth rate, density and biomass production rate) were used as the input for a feasibility assessment of large scale worm production on secondary sludge from the potato industry. In addition, in chapter 6 future value chains and lines of research were discussed.

A hypothetical worm production system treating the surplus secondary sludge from a potato processing factory can reduce excess sludge production by 50 % in solids and 62 % in volume. This is accompanied by a daily production of 1.6 metric ton of fresh worm biomass. With a very conservative estimation of the worm density of 1.6 kg ww/m2 carrier material a footprint of the system of 217 m2 can be realized, which is at least two times smaller than with a previous reactor design without a gravel layer. With reduced sludge processing costs and a conservative market price of 1.4 €/kg dry worm biomass, worm production can already be realized at an annual rate of return of 3 years. However, the costs are highly sensitive for worm biomass stocking, reactor construction and operation. A more accurate economic assessment should be based on the results of pilot-scale research.

Two general product types, whole biomass (as fish feed) and refined products can be distinguished and applied in two application areas (feed and non-food), depending on the quality of the organic (waste) sludge that the worms have been produced from. Valorisation for potential bulk markets needs further refinery of crude worm biomass into a lipid (worm oil) and a protein fraction (protein isolate). This can result in several new and unique business models in aquaculture, feed, chemical and agriculture sectors. Obviously, an assessment of economical and legislative boundary conditions needs to be part of such business models.

Worm biomass is a potential high quality fishmeal replacer, with a similar or even better potential than other waste based alternatives such as single cell biomass and insects. A comparison between Lv and fishmeal with respect to crude composition, essential amino acids and FAs learns that Lv is a highly suitable fish feed source. It can provide essential amino acids at sufficiently high levels. Based on its FA composition and (relatively low) fat content, Lv can best be considered a protein source. Still, worm biomass is rich in PUFA, which could be a potential high value product for feed applications. Compared to black soldier fly and bacterial production systems, Lv shows intermediate production efficiencies, while biomass harvesting and processing probably is more easy.

Additional advantages of Lv worm biomass to replace fishmeal are: 1) Lv acts as a strong natural fish attractant, 2) the growth efficiency of fish on worms is high in comparison to regular feeds, 3) the nutritional profile of worms matches that of fishmeal, 4) the worms are a natural feed source for freshwater fish and 5) the worms allow a secure and stable feed production that is independent of natural resources.

Further recommendations for future research as outlined and discussed in chapter 6 are mostly related to the technical upscaling of the reactor technology and obtaining more detailed insight in controlled worm growth in response to food characteristics, reactor design and operational conditions.

Biodiversity and climate determine the functioning of Neotropical forests
Poorter, L. ; Sande, M.T. van der; Arets, E.J.M.M. ; Ascarrunz, N. ; Enquist, B.J. ; Finegan, B. ; Licona, J.C. ; Martinez-Ramos, M. ; Mazzei, L. ; Meave, J. ; Munoz, R. ; Nytch, C.J. ; Oliveira, A.A. de; Perez-Garcia, E.A. ; Prado-Junior, J.A. ; Rodriguez-Velazquez, J. ; Ruschel, A.R. ; Salgado Negret, B. ; Schiavini, I. ; Swenson, N.G. ; Tenorio, E.A. ; Thompson, J. ; Toledo, M. ; Uriarte, M. ; Hout, P. van der; Zimmerman, J.K. ; Pena Claros, M. - \ 2017
biodiversity - biomass - carbon - ecosystem functioning - forest dynamics - productivity - soil fertility - tropical forest - water
Tropical forests account for a quarter of the global carbon storage and a third of the terrestrial productivity. Few studies have teased apart the relative importance of environmental factors and forest attributes for ecosystem functioning, especially for the tropics. This study aims to relate aboveground biomass (AGB), biomass dynamics (i.e., net biomass productivity and its underlying demographic drivers: biomass recruitment, growth and mortality) to forest attributes (tree diversity, community-mean traits, and stand basal area) and environmental conditions (water availability, soil fertility and disturbance). We used data from 26 sites, 201 one-ha plots and >92,000 trees distributed across the Neotropics. We quantified for each site water availability and soil total exchangeable bases and for each plot three key community-weighted mean functional traits that are important for biomass stocks and productivity. We used structural equation models to test the hypothesis that all drivers have independent, positive effects on biomass stocks and dynamics. Of the relationships analysed, vegetation attributes were more frequently significantly associated with biomass stocks and dynamics than environmental conditions (in 67% versus 33% of the relationships). High climatic water availability increased biomass growth and stocks, light disturbance increased biomass growth, and soil bases had no effect. Rarefied tree species richness had consistent positive relationships with biomass stocks and dynamics, probably because of niche complementarity, but was not related to net biomass productivity. Community-mean traits were good predictors of biomass stocks and dynamics. Water availability has a strong positive effect on biomass stocks and growth, and a future predicted increase in (atmospheric) drought might, therefore, potentially reduce carbon storage. Forest attributes – including species diversity and community-weighted mean traits – have independent and important relationships with AGB stocks, dynamics, and ecosystem functioning, not only in relatively simple temperate systems, but also in structurally complex hyper-diverse tropical forests.
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