期刊
HYDROBIOLOGIA
卷 767, 期 1, 页码 125-135出版社
SPRINGER
DOI: 10.1007/s10750-015-2486-8
关键词
Coastal area; Baltic Sea; Water temperature; Prey; Temporal overlap
资金
- Estonian Ministry of Education and Research [SF0180005s10]
- Estonian Research Council [IUT02-20]
- Estonian Science Foundation [8747]
- BONUS (INSPIRE and BIO-C3 projects)
- joint Baltic Sea research and development programme [185]
- European Union
- Estonian Research Council
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.
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