Anthropogenic effects on links between macro-invertebrate diversity and ecosystem functioning
How are links between macro-invertebrate diversity and ecosystem functioning influenced by anthropogenic pressures?
Increasing our understanding of the fundamental links between invertebrate diversity and ecosystem functioning (and how these links are influenced by anthropogenic stressors) is essential to our efforts to conserve natural value in an era of unprecedented global change.
Macro-invertebrate effects on ecosystem functioning (decomposition) using DECOTABs. www.decotab.org
Decomposition of plant litter is a vital ecosystem process driven by both microorganisms and detritivorous invertebrates. Many ecosystems are, however, under continuous toxic pressure. Toxicants potentially decouple links between biodiversity and ecosystem processes. For instance by directly affecting decomposer organisms and therewith indirectly essential ecosystem processes. However, it remains largely unknown to which extent toxic effects cascade toward disordered ecosystem processes. The aim of the present project is therefore to evaluate how anthropogenic pressures, in particular the effects of agricultural land-use, affect the functional links between invertebrate biodiversity and ecosystem functioning. To this purpose, we perform field surveys and experiments complemented with laboratory experiments.
Standardized measures to determine decomposition rates are increasingly important for assessing effects of anthropogenic stressors on ecosystem processes. However, methods differ among studies, and some are based on using litter from different plant species that decompose at different rates. Even litter of the same species may vary in chemical composition and texture if collected at different locations or at different times. This variability hampers comparisons of decomposition dynamics over large spatial and temporal scales. We have developed a standardized substrate ( DECOTAB) that facilitates comparisons among studies, including studies aimed at assessing the response of ecosystem functioning to anthropogenic stressors. The DECOTAB approach could facilitate such standardized experiments at larger scales and increase power of meta-analyses. DECOTABS can be prepared in almost any desired size, shape, or composition to suit the needs of the specific question examined, allowing to address long-standing issues in aquatic ecology and environmental assessment.
Ellard R Hunting, Martina G Vijver, Harm G Van Der Geest, Christian Mulder, Michiel H S Kraak, Anton M Breure, Wim Admiraal: Resource niche overlap promotes stability of bacterial community metabolism in experimental microcosms. Frontiers in Microbiology 01/2015; 6(105).
Ellard R Hunting, Christopher M White, Maarten van Gemert, Daan Mes, Eva Stam, Harm G van, der Geest, Michiel H S Kraak, Wim Admiraal: UV radiation and organic matter composition shape bacterial functional diversity in sediments. Frontiers in Microbiology 10/2013; 4:317.
Ellard R. Hunting, Merrin H. Whatley, Harm G. van der Geest, Christian Mulder, Michiel H. S. Kraak, Anton M. Breure, Wim Admiraal: Invertebrate footprints on detritus processing, bacterial community structure and spatiotemporal redox profiles. Freshwater science 09/2012. 31(3):723-731.
Andries A. Kampfraath*, Ellard R. Hunting*, Christian Mulder, Mark O. Gessner, Michiel H. S. Kraak, Anton M. Breure, Wim Admiraal: DECOTAB: a multipurpose standard substrate to assess effects of litter quality on microbial decomposition and invertebrate consumption. Freshwater science 12/2012; 31(4):1156–1162.