The effects of winter ice cover on the trophic ecology of whitefish (Coregonus lavaretus L.) in subarctic lakes


Autoria(s): Hayden, B.; Harrod, C.; Kahilainen, K.K.
Data(s)

01/01/2012

Resumo

Lakes in Arctic and subarctic regions display extreme levels of seasonal variation in light, temperature and ice cover. Comparatively little is known regarding the effects of such seasonal variation on the diet and resource use of fish species inhabiting these systems. Variation in the diet of European whitefish Coregonus lavaretus (L.) during periods of ice cover in this region is often regarded as 'common knowledge'; however, this aspect of the species' ecology has not been examined empirically. Here, we outline the differences in invertebrate community structure, fish activity, and resource use of monomorphic whitefish populations between summer (August-September) and winter (February-March) in three subarctic lakes in Finnish Lapland. Benthic macroinvertebrate densities did not exhibit measurable differences between summer and winter. Zooplankton diversity and abundance, and activity levels of all fish species (measured as catch per unit effort) were lower in winter. The summer diet of C. lavaretus was typical of a generalist utilising a variety of prey sources. In winter, its dietary niche was significantly reduced, and the diet was dominated by chironomid larvae in all study sites. Pelagic productivity decreases during winter, and fish species inhabiting these systems are therefore restricted to feeding on benthic prey. Sampling time has strong effect on our understanding of resource utilisation by whitefish in subarctic lakes and should be taken into account in future studies of these systems. © 2012 John Wiley & Sons A/S.

Identificador

http://pure.qub.ac.uk/portal/en/publications/the-effects-of-winter-ice-cover-on-the-trophic-ecology-of-whitefish-coregonus-lavaretus-l-in-subarctic-lakes(2788eee6-5e10-4d13-83ad-031a7e2bc65a).html

http://dx.doi.org/10.1111/eff.12014

http://www.scopus.com/inward/record.url?partnerID=yv4JPVwI&eid=2-s2.0-84869864540&md5=a961d48fb1a672a63027b70faf1ba651

Idioma(s)

eng

Direitos

info:eu-repo/semantics/restrictedAccess

Fonte

Hayden , B , Harrod , C & Kahilainen , K K 2012 , ' The effects of winter ice cover on the trophic ecology of whitefish (Coregonus lavaretus L.) in subarctic lakes ' ECOLOGY OF FRESHWATER FISH . DOI: 10.1111/eff.12014

Tipo

article