2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/27/2021 | 2:00 PM - 3:30 PM | FOOD WEB LINKAGES ACROSS BOUNDARIES – PUFA TRANSFER FROM STREAMS TO RIPARIAN SPIDERS | Virtual Platform
FOOD WEB LINKAGES ACROSS BOUNDARIES – PUFA TRANSFER FROM STREAMS TO RIPARIAN SPIDERS
PUFAs are essential resources unequally distributed throughout the landscape. Certain PUFAs, like eicosapentaenoic acid (EPA) are e.g. common in aquatic but scarce in terrestrial systems. In environments with low supply, meeting nutritional needs requires either adaptations in metabolism to PUFA-poor resources or selective foraging for PUFA-rich resources. Subsidies from adjacent systems, such as amphibiotic organisms that use different environments during their life cycle, represent such resources that can be exploited by predators. In this study, we quantified PUFA transfer from aquatic to terrestrial ecosystems starting with periphyton as the initial PUFA source, through emergent insects, to riparian spiders. We used a combination of carbon stable isotope and fatty acid analysis to follow the food web linkage across the ecosystem boundary. Results showed that riparian spiders consumed considerable amounts of aquatic-derived resources. EPA represented on average 15 % of the total fatty acids in riparian spiders. Season as well as spider lifestyle had a strong influence on PUFA profiles. We show that especially PUFA profiles of riparian web-building spiders in spring were tightly linked to those of emergent aquatic insects.
- Food webs
- Nutrients
- Resource subsidies
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Presenters/Authors
Carmen Kowarik
(), Swiss Federal Institute of Aquatic Science and Technology, EAWAG, carmen.kowarik@eawag.ch;
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Dominik Martin-Creuzburg
(), Limnological Institute, University of Konstanz, dominik.martin-creuzburg@uni-konstamz.de;
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Christopher Robinson
(), Swiss Federal Institute of Aquatic Science and Technology, EAWAG ; Aquatic Ecology dpt., Christopher.robinson@eawag.ch;
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