Abstract
Streblospio benedicti (Webster) from Tar Landing North Carolina (NC), USA with either planktotrophic or lecithotrophic development were reared under two food levels and three temperature regimes (two mimicking seasonal cycles in NC and one at constant 20°C). During the eight-month experiment no females switched reproductive mode and no significant differences in survivorship or reproductive activity were observed between reproductive types. However, reproductive activity and fecundity-related parameters were subject to influence by food and temperature. Survivorship, body size, and larval production was greater in winter-spring than summer-fall regimes. Higher food levels produced increased survivorship, reproductive activity and egg production in adults with lecithotrophic development but no change in those with planktotrophic development. Body size, egg size, egg number, numbers of larvae per brood pouch, and brood size were strongly correlated in female S. benedicti and most correlation coefficients were similar (or identical) in individuals having planktotrophic and lecithotrophic development. A comparison of egg size and brood size in females from Tar Landing suggests that individuals with the two forms of development package offspring differently but expend approximately equivalent reproductive effort. Larval trophic mode is best viewed as a genetic polymorphism in S. benedicti. Individuals with planktotrophic and lecithotrophic development exhibit similar reproductive responses to environmental variation and there is no evidence for speciation.
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Communicated by J. M. Lawrence, Tampa
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Levin, L.A., Creed, E.L. Effect of temperature and food availability on reproductive responses of Streblospio benedicti (Polychaeta: Spionidae) with planktotrophic or lecithotrophic development. Marine Biology 92, 103–113 (1986). https://doi.org/10.1007/BF00392752
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DOI: https://doi.org/10.1007/BF00392752