Temperature-driven changes in early life-history stages influence the Gulf of Riga spring spawning herring (Clupea harengus m.) recruitment abundance.

Arula, T., Raid, T., Simm, M. and Ojaveer, H. (2015) Temperature-driven changes in early life-history stages influence the Gulf of Riga spring spawning herring (Clupea harengus m.) recruitment abundance. Hydrobiologia . DOI 10.1007/s10750-015-2486-8.

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Abstract

Processes occurring during early life-history stages influence the year-class abundance of marine fish. We found that the abundance of 1-year-old spring spawning herring is statistically significantly determined by the number of post-flexion herring larvae in the Gulf of Riga (Baltic Sea). The abundance of consecutive developmental stages of larvae: yolk-sac, pre-flexion, flexion and post-flexion strongly correlated with each other, indicating that factors which already influence the yolk-sac stage are important in determining the abundance of post-flexion herring larvae. Winter air temperature before spawning determined the timing of maximum abundance of pre-flexion herring larvae, but not their main prey: copepod nauplii, implying that different mechanisms governing major preconditions for the formation of year-class strength. The abundance of post-flexion larvae displayed a potential dome-shaped relationship with sea surface temperature experienced after hatching. We suggest that increased summer temperatures, which exceed the physiological optimum negatively, affect the survival of post-flexion herring larvae. Overall, future climate warming poses an additional risk to larval herring survival and this may lead to a reduction in those herring stock which rely on recruitment from shallow coastal areas.

Document Type: Article
Keywords: Coastal area; Baltic Sea; Water temperature; Prey; Temporal overlap
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s10750-015-2486-8
ISSN: 0018-8158
Projects: Enrichment, BONUS BIO-C3
Date Deposited: 16 Dec 2015 11:03
Last Modified: 16 Dec 2015 13:58
URI: http://oceanrep.geomar.de/id/eprint/30639

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