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Allochthonous resources are less important for faunal communities on highly productive, small tropical islands

Title data

Steibl, Sebastian ; Sigl, Robert ; Blaha, Sanja ; Drescher, Sophia ; Gebauer, Gerhard ; Gürkal, Elif ; Hüftlein, Frederic ; Satzger, Anna ; Schwarzer, Michael ; Seidenath, Dimitri ; Welfenbach, Jana ; Zinser, Raphael S. ; Laforsch, Christian:
Allochthonous resources are less important for faunal communities on highly productive, small tropical islands.
In: Ecology and Evolution. Vol. 11 (2021) Issue 19 . - pp. 13128-13138.
ISSN 2045-7758
DOI: https://doi.org/10.1002/ece3.8035

Abstract in another language

Ecosystems are interconnected by energy fluxes that provide resources for the inhabiting organisms along the transition zone. Especially where in situ resources are scarce, ecosystems can become highly dependent on external resources. The dependency on external input becomes less pronounced in systems with elevated in situ production, where only consumer species close to the site of external input remain subsidized, whereas species distant to the input site rely on the in situ production of the ecosystem. It is largely unclear though if this pattern is consistent over different consumer species and trophic levels in one ecosystem, and whether consumer species that occur both proximate to and at a distance from the input site differ in their dependency on external resource inputs between sites. Using stable isotope analysis, we investigated the dependency on external marine input for common ground-associated consumer taxa on small tropical islands with high in situ production. We show that marine input is only relevant for strict beach-dwelling taxa, while the terrestrial vegetation is the main carbon source for inland-dwelling taxa. Consumer species that occurred both close (beach) and distant (inland) to the site of marine input showed similar proportions of marine input in their diets. This supports earlier findings that the relevance of external resources becomes limited to species close to the input site in systems with sufficient in situ production. However, it also indicates that the relevance of external input is also species-dependent, as consumers occurring close and distant to the input site depended equally strong or weak on marine input.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Beach wrack; Food web; Marine subsidies; Stable isotope analysis
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Animal Ecology I > Chair Animal Ecology I - Univ.-Prof. Dr. Christian Laforsch
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Animal Ecology I
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
500 Science > 570 Life sciences, biology
500 Science > 590 Animals (Zoology)
Date Deposited: 18 Oct 2021 08:24
Last Modified: 19 Oct 2021 08:25
URI: https://eref.uni-bayreuth.de/id/eprint/67362