Forest conversion to oil palm compresses food chain length in tropical streams

Clare L. Wilkinson and Kenny W. J. Chua and Roswitha Fiala and Jia, Huan Liew and Victoria Kemp and Arman Hadi Fikri and Robert M. Ewers and Pavel Kratina and Darren C. J. Yeo (2021) Forest conversion to oil palm compresses food chain length in tropical streams. Bulletin of the Ecological Society of America, 102 (2). pp. 1-5. ISSN 2327-6096

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In Southeast Asia, biodiversity-rich forests are being extensively logged and converted to oil palm monocultures. Although the impacts of these changes on biodiversity are largely well documented, we know addition to samples we collected in 201 little about how these large-scale impacts affect freshwater trophic ecology. We used stable isotope analyses (SIA) to determine the impacts of land-use changes on the relative contribution of allochthonous and auto chthonous basal resources in 19 stream food webs. We also applied compound-specific SIA and bulk SIA to determine the trophic position of fish apex predators and meso-predators (invertivores and omnivores). There was no difference in the contribution of autochthonous resources in either consumer group (70–82%) among streams with different land-use type. There was no change in trophic position for meso-predators, but trophic position decreased significantly for apex predators in oil palm plantation streams compared to forest streams. This change in maximum food chain length was due to turnover in identity of the apex predator among land-use types. Disruption of aquatic trophic ecology, through reduction in food chain length and shift in basal resources, may cause significant changes in biodiversity as well as ecosystem functions and services. Understanding this change can help develop more focused priorities for mediating the negative impacts of human activities on freshwater ecosystems

Item Type: Article
Keyword: Autochthony , Food Web , Freshwater Fish , Niche Size , Stable Isotope Analysis , Trophic Ecology
Subjects: S Agriculture > SD Forestry
Department: FACULTY > Faculty of Tropical Forestry
Depositing User: NORAINI LABUK -
Date Deposited: 18 Jun 2021 08:48
Last Modified: 18 Jun 2021 08:48

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