Abstract
All bivalves investigated (Astarte borealis, Astarte elliptica, Macoma calcarea, Cyprina islandica, Macoma baltica, Cardium lamarcki) are dioecious. The mean egg-diameters were determined by a series of measurements for 6 bivalves and compared with data from other authors. M. calcarea does not have a direct non-pelagic larval development as previously assumed, but probably produces pelagic planktotrophic larvae. The arctic species exhibit no modification of their mode of development in the boreal area. The boreal forms spawn over a relatively short period in spring and summer. The arctic forms revealed, over long periods, ripe eggs and sperms. Apparently they begin to spawn in winter or early spring. This extension and shift of the spawning season represents adaptation of the Aretic species to the specific conditions of the Baltic Sea. The number of eggs laid by the most important bivalves were determined and correlated with the larval ecology and length of generation time.
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Communicated by O. Kinne, Hamburg
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Von Oertzen, J.A. Cycles and rates of reproduction of six Baltic Sea bivalves of different zoogeographical origin. Mar. Biol. 14, 143–149 (1972). https://doi.org/10.1007/BF00373213
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DOI: https://doi.org/10.1007/BF00373213