Interplay between temperature, fish partial migration and trophic dynamics

Brodersen, Jakob; Nicolle, Alice; Nilsson, P. Anders; Skov, Christian; Brönmark, Christer; Hansson, Lars-Anders (2011). Interplay between temperature, fish partial migration and trophic dynamics. Oikos, 120(12), pp. 1838-1846. Blackwell 10.1111/j.1600-0706.2011.19433.x

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Whereas many studies have addressed the mechanisms driving partial migration, few have focused on the consequences of partial migration on trophic dynamics, and integrated studies combining the two approaches are virtually nonexistent. Here we show that temperature affects seasonal partial migration of cyprinid fish from lakes to predation refuges in streams during winter and that this migration in combination with temperature affects the characteristics and phenology of lower trophic levels in the lake ecosystem. Specifically, our six-year study showed that the proportion of fish migrating was positively related to lake temperature during the pre-migration growth period, i.e. during summer. Migration from the lake occurred later when autumn water temperatures were high, and timing of return migration to the lake occurred earlier at higher spring water temperatures. Moreover, the winter mean size of zooplankton in the lake increased with the proportion of fish being away from the lake, likely as a consequence of decreased predation pressure. Peak biomass of phytoplankton in spring occurred earlier at higher spring water temperatures and with less fish being away from the lake. Accordingly, peak zooplankton biomass occurred earlier at higher spring water temperature, but relatively later if less fish were away from the lake. Hence, the time between phyto- and zooplankton peaks depended only on the amount of fish being away from the lake, and not on temperature. The intensity of fish migration thereby had a major effect on plankton spring dynamics. These results significantly contribute to our understanding of the interplay between partial migration and trophic dynamics, and suggest that ongoing climate change may significantly affect such dynamics.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE)
08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE) > Aquatic Ecology

UniBE Contributor:

Brodersen, Jakob

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 590 Animals (Zoology)

ISSN:

0030-1299

Publisher:

Blackwell

Language:

English

Submitter:

Marcel Häsler

Date Deposited:

05 Sep 2014 15:51

Last Modified:

28 Dec 2014 17:25

Publisher DOI:

10.1111/j.1600-0706.2011.19433.x

BORIS DOI:

10.7892/boris.48892

URI:

https://boris.unibe.ch/id/eprint/48892

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