{"refrec":{"BRefID":129860,"RR":"<b>Gjoesaeter, H; Bogstad, B.; Tjelmeland, S.</b> (2009). Ecosystem effects of the three capelin stock collapses in the Barents Sea. <i>Mar. Biol. Res. 5(1)</i>: 40-53. <a href=\"http://dx.doi.org/10.1080/17451000802454866\" target=\"_blank\">http://dx.doi.org/10.1080/17451000802454866</a>","BEntID":123940,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Mar. Biol. Res. 5(1)</i>: 40-53. <a href=\"https://dx.doi.org/10.1080/17451000802454866\" target=\"_blank\">https://dx.doi.org/10.1080/17451000802454866</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Gjoesaeter, H; Bogstad, B.; Tjelmeland, S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Gjoesaeter, H <i>et al.</i>","Englishabstract":"The Barents Sea capelin stock underwent drastic changes in stock size during the last three decades. Three stock collapses occurred in 1985-1989, 1993-1997, and 2003-2006. The collapses had effects both downwards and upwards in the food web. The release in predation pressure from the capelin stock led to increased amounts of zooplankton during the collapse periods. When capelin biomass was drastically reduced, its predators were affected in various ways. Cod experienced increased cannibalism, growth was reduced and maturation delayed. Sea birds experienced increased rates of mortality and total recruitment failures, and breeding colonies were abandoned for several years. Harp seals experienced food shortage, increased mortality because they invaded the coastal areas and were caught in fishing gears, and recruitment failures. There is evidence for differences in how the three capelin collapses affected the predators. The effects were most serious during the 1985-1989 collapse and can hardly be traced during the ongoing collapse. We conclude that these differences likely result from increased availability of alternative food sources during the two last periods of collapse. 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