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

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Title: Forest conversion to oil palm compresses food chain length in tropical streams.
Authors: Wilkinson, CL
Chua, KWJ
Fiala, R
Liew, JH
Kemp, V
Hadi Fikri, A
Ewers, RM
Kratina, P
Yeo, DCJ
Item Type: Journal Article
Abstract: 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 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 autochthonous 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.
Issue Date: 24-Sep-2020
Date of Acceptance: 20-Jul-2020
URI: http://hdl.handle.net/10044/1/83227
DOI: 10.1002/ecy.3199
ISSN: 0012-9658
Publisher: Ecological Society of America
Start Page: 1
End Page: 10
Journal / Book Title: Ecology
Volume: 102
Issue: 1
Copyright Statement: This article is protected by copyright. All rights reserved.
Sponsor/Funder: Rainforest Research Sdn Bhd
Funder's Grant Number: LBEE_P34395
Keywords: Science & Technology
Life Sciences & Biomedicine
Ecology
Environmental Sciences & Ecology
autochthony
food web
freshwater fish
niche size
stable isotope analysis
trophic ecology
NITROGEN ISOTOPIC COMPOSITION
STABLE-ISOTOPES
AMINO-ACIDS
ALLOCHTHONOUS RESOURCES
FUNCTIONAL RICHNESS
RIPARIAN FOREST
ECOSYSTEM SIZE
WEB STRUCTURE
RAIN-FOREST
TOP-DOWN
autochthony
food web
freshwater fish
niche size
stable isotope analysis
trophic ecology
autochthony
food web
freshwater fish
niche size
stable isotope analysis
trophic ecology
Ecology
0501 Ecological Applications
0602 Ecology
0603 Evolutionary Biology
Publication Status: Published
Conference Place: United States
Online Publication Date: 2020-09-24
Appears in Collections:Faculty of Natural Sciences