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GROWTH AND REPRODUCTION IN TWO BRACKISH WATER POPULATIONS OF ORCHESTIA GAMMARELLUS (AMPHIPODA: TALITRIDAE) IN THE BALTIC SEA

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ABSTRACT The population structure and reproductive biology of Orchestia gammarellus was studied for 1 year at 2 localities in Kalmar Sound, southern Baltic. Wrack-bed composition was either dominated by Fucus vesiculosus (bladderwrack) or Zostera marina (eelgrass). Growth of the summer generation was significantly higher in beds of Zostera, but overwintering animals were significantly larger in beds of Fucus. The breeding cycle started in May and ovigerous females were found to the beginning of September. The first juveniles were found in the beginning of July. The life cycle was annual and multivoltine, with most of the females giving rise to at least 2 broods in their second summer. The sex ratio was female-biased, especially in summer. There was a direct relationship between brood size and female length if the maximum brood size in each 0.1-mm length class was used. Breeding females ranged between 9.0 and 15.0 mm in total length.

10.1163/193724099X00240
/content/journals/10.1163/193724099x00240
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/content/journals/10.1163/193724099x00240
2017-08-22

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