Distributions,life cycles and hybridization of two Mysis relicta group species (Crustacea: Mysida) in the northern Baltic Sea and Lake Båven |
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Authors: | Väinölä Risto Vainio Jouni K |
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Institution: | (1) Finnish Museum of Natural History, University of Helsinki, P.O.Box 17, FIN-00014, Finland; e-mail |
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Abstract: | We used electrophoretically identified material to assess the geographical distributions, life cycles and interspecific hybridization
of two sibling species of the Mysis relicta species group (sp. I and sp. II) in the northern Baltic region. In the Gulf of
Finland, sp. I prevails in inshore waters and sp. II in the open sea; the distributions overlap in the outer archipelago zone.
In the Gulf of Bothnia, only sp. II was found in the southern part (Bothnian Sea), whereas the two species coexist throughout
the northerly Bothnian Bay. Both the local and large-scale distributions are salinity-related, but salinity alone does not
explain the differences. The two species exhibit different patterns of geographical variation in their life histories. In
strict sympatry in the north they have identical two-year life cycles with winter breeding. Further south (Gulf of Finland),
sp. I exhibits a predominantly one-year winter-breeding cycle, whereas sp. II breeds throughout the year. The patterns comply
with the concept of a great phenotypic flexibility and environmental control of life history characteristics in the Mysis
relicta group, and make a contrast to the stable life cycle of the congeneric M. mixta. F1 hybrids between the two M. relicta
group species were found at a low frequency (0.6%) in the Bothnian Bay, but not in other areas of sympatry.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Mysida Baltic Sea life history variation sibling species hybridization |
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