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Title of article :
The influence of environmental conditions on early life stages of flounder (Platichthys flesus) in the central Baltic Sea
Author/Authors :
Ustups، نويسنده , , Didzis and Müller-Karulis، نويسنده , , Bنrbel and Bergstrom، نويسنده , , Ulf and Makarchouk، نويسنده , , Andrej and Sics، نويسنده , , Ivo، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
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Abstract :
Flounder (Platichthys flesus) is a temperate marine fish that is well adapted to the brackish waters of the Baltic Sea. There are two sympatric flounder populations in the Baltic Sea, pelagic and demersal spawners, which differ in their spawning habitat and egg characteristics. In the present study, pelagic spawning flounder of the central Baltic Sea was studied. We examined whether variations in hydrological regime can explain fluctuations in flounder early life stages that have occurred over the past 30 years (1970–2005). Using generalized additive modeling to explain the abundance of flounder eggs and larvae in a Latvian ichthyoplankton dataset, we evaluate the hypothesis that the available reproductive volume, defined as the water column with dissolved oxygen larger than 1 ml/l and salinity between 10.6 and 12 PSU, affects the survival of flounder ichthyoplankton and determines recruitment success. eproductive volume and spawning stock biomass were significant factors determining flounder ichthyoplankton abundance. Different measures of water temperature did not contribute significantly to the variability of eggs or larvae. However, recruitment did not correlate to the supply of larvae. The findings presented in this study on the relationship between flounder reproduction, spawning stock biomass and reproductive volume, as well as the lack of correlation to recruitment, are valuable for the understanding of flounder ecology in the Baltic Sea, and for developing the management of the species.
Keywords :
Baltic Sea , flounder , Eggs , Larvae , Reproductive Volume
Journal title :
Journal of Sea Research
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