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Reproductive habits of 4 populations of musculium securis bivalvia sphaeriidae near ottawa canada


Nautilus 90(2): 76-86
Reproductive habits of 4 populations of musculium securis bivalvia sphaeriidae near ottawa canada
Comparative reproductive habits of populations of M. securis (Prime) in 2 temporary forest ponds, a river and a permanent pond near Ottawa, Canada, were determined from samples collected seasonally for 1-3 yr, and from laboratory and field experiments. Gametogenesis is most active during the summer months. Spermatogenesis and oogenesis usually occur simultaneously although protogyny is often apparent. Of 4-10 brood sacs produced per inner gill, only 2-4 usually mature. Only 31-63% of the larvae in each brood sac are viable from the fetal stage of development. The average litter size produced varies from 2.1-4.8 individuals/parent. Intrapopulation variations in reproduction are more pronounced in temporary than in permanent aquatic habitats. Interpopulation transplants of M. securis indicate that reproductive habits may be adaptively modified.


Accession: 006316947



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