Seasonal variation in the invertebrate community and diet of a top fish predator in a thermally stable spring
| العنوان: | Seasonal variation in the invertebrate community and diet of a top fish predator in a thermally stable spring |
|---|---|
| المؤلفون: | Jón S. Ólafsson, Bjarni K. Kristjánsson, David Benhaïm, Camille A. Leblanc, Eoin J. O'Gorman, Agnes-Katharina Kreiling, Snæbjörn Pálsson |
| المساهمون: | Líf- og umhverfisvísindadeild (HÍ), Faculty of Life and Environmental Sciences (UI), Fiskeldis- og fiskalíffræðideild (HH), Department of Aquaculture and Fish Biology (HUC), Verkfræði- og náttúruvísindasvið (HÍ), School of Engineering and Natural Sciences (UI), Háskóli Íslands, University of Iceland, Háskólinn á Hólum, Hólar University College |
| بيانات النشر: | Springer Science and Business Media LLC, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | 0106 biological sciences, Feeding selectivity, Salvelinus alpinus, 010504 meteorology & atmospheric sciences, Ecology, Biology, Aquatic Science, biology.organism_classification, 010603 evolutionary biology, 01 natural sciences, Individual specialisation, Predation, Sjávarlíffræði, Arctic charr, Bleikja, Phenology, Benthic zone, Aquatic science, Predator, Árstíðasveiflur, 0105 earth and related environmental sciences, Trophic level, Salvelinus, Invertebrate, Apex predator |
| الوصف: | Many life-history events in aquatic invertebrates are triggered by seasonal changes in water temperature, but other ecological factors may be important as well. To rule out the confounding effects of changing water temperature, we studied the seasonal dynamics of an aquatic invertebrate community and their effect on a top fish predator in a thermally stable freshwater spring in South Iceland. We sampled benthic invertebrates five times over a year and conducted a mark-recapture study on the top predator in the system, small benthic Arctic charr, Salvelinus alpinus (L.). We assessed variation in diet composition and feeding preferences by calculating the electivity and individual specialisation of each fish at each sampling time. There was a clear separation of winter and summer communities for the benthic invertebrates. The variation in prey availability was also reflected in the fish diet, with higher feeding selectivity in summer than in winter for the highly abundant Chironomidae larvae. In contrast, individual specialisation as a measure of intrapopulation niche variation was higher in winter when prey availability was lower. We furthermore found that groundwater amphipods might play an important role in the winter diet of spring-dwelling Arctic charr. In conclusion, seasonal variation in the invertebrate community is an important factor to consider and has the potential to alter the phenotype (e.g. growth rates) and behaviour (e.g. feeding preferences) of higher trophic levels. The project was funded by the Icelandic Research Fund (RANNÍS), Grants nr. 141863-051 and 185083-051, and by Náttúruverndarsjóður Pálma Jónssonar. |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::565a3129a527952ef1d81c7918fca8d6 https://hdl.handle.net/20.500.11815/2456 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....565a3129a527952ef1d81c7918fca8d6 |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |