Report of the Workshop on Including Socio-Economic considerations into the Climate-recruitment framework developed for clupeids in the Baltic Sea (WKSECRET)
reportposted on 2010-01-01, 00:00 authored by ICESICES
Recruitment–environment relationships for five distinct Baltic Sea herring stocks in‐habiting the areas of the Western Baltic (WBH), the Main Basin (MBH), the Gulf of Riga (GRH), the Bothnian Sea (BSH) and the Bothnian Bay (BBH) and for the Baltic sprat stock (BS) were developed and tested in two previous workshops held in 2007 and 2008 (WKHRPB and WKSSRB; ICES 2007 and 2008) and published in Cardinale et al. 2009. A number of hydro‐climatic and biological predictors were tested for their effect on recruitment. In previous analyses, temperature was determined to be an im‐portant predictor for four of the stocks (MBH, GRH, BSH and BS). However, spawn‐ing stock biomass was the major factor explaining recruitment for GRH and BS while weight‐at‐age of the spawners and spawning stock biomass as those are highly corre‐lated were important predictors of MBH recruitment. For 2 (i.e. MBH and BSH) out of 5 stocks for which complete zooplankton data were available, food supply was also a significant predictor, suggesting that changes in climate and/or food web structure may indirectly affect herring recruitment via prey availability for the recruits or spawners. The results emphasized both similarities and differences in the main regu‐lators of recruitment dynamics for the different stocks that should be taken into con‐sideration in the development of area‐specific management strategies thorough the Baltic Sea basin. Further, it calls for a thorough analysis of the effects of climate change on productivity of Baltic herring and sprat stocks in the medium term.
Published under the auspices of the following ICES Steering Group or Committee
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