Consumer trophic positions respond variably to seasonally fluctuating environments.
aquatic
environmental variation
fishes
food webs
omnivory
stable isotopes
stomach contents
tropical river-floodplain ecosystem
Journal
Ecology
ISSN: 0012-9658
Titre abrégé: Ecology
Pays: United States
ID NLM: 0043541
Informations de publication
Date de publication:
02 2019
02 2019
Historique:
received:
22
02
2018
revised:
19
10
2018
accepted:
24
10
2018
pubmed:
19
1
2019
medline:
3
9
2019
entrez:
19
1
2019
Statut:
ppublish
Résumé
The effects of environmental seasonality on food web structure have been notoriously understudied in empirical ecology. Here, we focus on seasonal changes in one key attribute of a food web, consumer trophic position. We ask whether fishes inhabiting tropical river-floodplain ecosystems behave as seasonal omnivores, by shifting their trophic positions in relation to the annual flood pulse, or whether they feed at the same trophic position all year, as much empirical work implicitly assumes. Using dietary data from the Tonle Sap Lake, Cambodia, and a literature review, we find evidence that some fishes, especially small piscivores, increased consumption of invertebrates and/or plant material during the wet season, as predicted. However, nitrogen stable isotope (δ
Substances chimiques
Nitrogen Isotopes
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
e02570Subventions
Organisme : Belmont Forum
Pays : International
Organisme : National Science and Engineering Council of Canada Discovery Grant
Pays : International
Organisme : Japan Society for the Promotion of Science
ID : 17K1506
Pays : International
Informations de copyright
© 2019 by the Ecological Society of America.