Research article - Peer-reviewed, 2017
Temperature- and light-dependent ratio of energy gain to metabolic costs explains spatial and temporal habitat use of zooplanktivorous fish
Beier, UAbstract
Understanding the forces that drive habitat selection of species in communities is important in both ecology and evolution. In nature, species face variation in competition, predation and physical characters among habitats. Vendace (Coregonus albula (L.)) is a specialised zooplanktivorous fish predominantly using deeper water in lakes during summer, while roach (Rutilus rutilus (L.)) uses mainly the shallow littoral zone as well as the upper layer of the pelagic zone. To understand mechanisms behind habitat use of these species, I first conducted a predation experiment to investigate their sensitivity to predation by perch (Perca fluviatilis L.). Second, I performed a foraging experiment using different temperature and light treatments. I then used metabolic calculations to estimate energetic costs when foraging. I found no difference between species regarding sensitivity to predation. Vendace was the most efficient forager on zooplankton but also swam faster spending more energy compared to roach. Roach had a comparatively high metabolic rate in the lowest temperature, where their foraging efficiency was lowest. The energy gain ratio at 6 degrees C was highest for vendace, while it was lowest for roach. In the highest temperature (18 degrees C) and the lowest light level (1lux), both species were similar in their energy gain ratio. The relative energy gain ratio provides a mechanism to explain habitat distribution for the two species. An increased understanding of the role of metabolism in combination with biotic interactions and habitat use may help to foresee effects of environmental change for different species.Keywords
competition; predation; metabolism; trade-off; zooplankton; Coregonus albula; Rutilus rutilusPublished in
Ecology of Freshwater Fish2017, volume: 26, number: 4, pages: 506-516
Authors' information
Beier, Ulrika
Swedish University of Agricultural Sciences, Department of Aquatic Resources
UKÄ Subject classification
Ecology
Environmental Sciences
Fish and Aquacultural Science
Publication Identifiers
DOI: https://doi.org/10.1111/eff.12290
URI (permanent link to this page)
https://res.slu.se/id/publ/77879