Recovery in eastern Baltic cod: is increased recruitment caused by decreased predation on early life stages?

Autor:	Matthias Schaber, Margit Eero, Friedrich W. Köster, Viola Neumann
Rok vydání:	2014
Předmět:	Ecology biology Sprattus sprattus Sprat Clupea Aquatic Science Ichthyoplankton Oceanography biology.organism_classification Predation Fishery Herring Abundance (ecology) Gadus Ecology Evolution Behavior and Systematics
Zdroj:	ICES Journal of Marine Science. 71:1382-1392
ISSN:	1095-9289 1054-3139
DOI:	10.1093/icesjms/fsu112
Popis:	Cod (Gadus morhua) recruitment in the eastern Baltic Sea is influenced by predation on early life stages by sprat (Sprattus sprattus) and herring (Clupea harengus), which is considered as one of the mechanisms preventing cod recovery in the 1990s. In the light of improved cod recruitment in the second half of the 2000s, new analyses of stomach content of sprat and herring were conducted, to elucidate the contribution of changes in predation pressure on cod recruitment. Comparison of stomach contents of sprat and herring in 2004–2008 with data from the 1990s showed a similar diet composition in the two periods; however, changes were found in the ichthyoplankton abundance and composition in the diet, indicating reduced predation pressure on cod eggs in the most recent period. The abundance of cod eggs in the field, availability of other prey, and horizontal and vertical overlap between predator and prey were investigated as potential factors influencing cod egg predation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e3c4fa5a75697ca8744396ef7319664f https://doi.org/10.1093/icesjms/fsu112 Zobrazit plný text záznamu