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Detection and apparent survival of PIT-tagged stream fish in winter
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. (Landscape Ecology Group)
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. (Landscape Ecology Group)
2016 (English)In: Ecology and Evolution, ISSN 2045-7758, E-ISSN 2045-7758, Vol. 6, no 8, 2536-2547 p.Article in journal (Refereed) PublishedText
Abstract [en]

Environmental fluctuations exert strong control on behavior, survival, and fitness of stream biota. Technical improvements increasingly allow for tracking the response of large numbers of individuals to environmental fluctuations, for instance, by remote detection of animals equipped with PIT (passive integrated transponder) tags. PIT tags were implanted into 393 juvenile and adult brown trout Salmo trutta L. and European sculpin Cottus gobio L. in a boreal stream subjected to considerable ice formation. With weekly trackings over 6 months, we quantified apparent survival and detection probability in relation to biological, environmental, and methodological factors. Individuals with a higher physical condition in autumn showed a higher apparent survival; this pattern was consistent across all species and age classes. Detection probability decreased with increasing thickness of the surface ice layer; this effect was most pronounced for juvenile trout and benthic-living sculpin, both tagged with smaller-sized tags. Detection probability was reduced in structurally complex habitats. Our study demonstrates that apparent survival and particularly detection probability may show pronounced spatiotemporal variation. In order to compare results from different sampling occasions and sites, a good knowledge of the study site and of the regulating factors is crucial.

Place, publisher, year, edition, pages
2016. Vol. 6, no 8, 2536-2547 p.
Keyword [en]
Brown trout, European sculpin, ice, Sweden, tracking
National Category
URN: urn:nbn:se:umu:diva-121480DOI: 10.1002/ece3.2061ISI: 000374568300024OAI: diva2:939662
Available from: 2016-06-20 Created: 2016-06-02 Last updated: 2016-06-20Bibliographically approved

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Weber, ChristineNilsson, Christer
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