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Reproduction and growth of the brooding bivalve transennella tantilla



Reproduction and growth of the brooding bivalve transennella tantilla



Veliger 30(3): 257-266



Transennella tantilla from the Sout Slough of Coos Bay, Oregon [USA], grow and reproduce year-around. Fecundity and release of young are seasonally variable. Males are smaller than females, and the transition from males to female is progressive over a broad size range, supporting histologic studies that indicated the species is protandric. Mortality is primarily focused on the largest size classes (> 2.0 mm. shell length) and appears to be caused by intense seasonal predation. Individuals of T. tantilla are larger and appear to be more abundant in False Bay on San Juan, Island, Washington, than in the South Slough of Coos Bay. Because these differences are so striking, several life-history traits of animals from the two areas were compared. In False Bay, males reach larger sizes and females begin brooding when larger; egg size is similar, but False Bay females have smaller broods and release young at a larger size than females in South Slough. The fucundity of female T. tantilla from both geographic locations is a linear function of body size.

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Accession: 006315446

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