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Reproductive energetics of two species of dorid nudibranchs with planktotrophic and lecithotrophic larval strategies

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Abstract

Onchidoris muricata (Müller) and Adalaria proxima (Alder and Hancock) are sympatric, potentially competing species of dorid nudibranchs, which preferentially graze the cheilostome polyzoan Electra pilosa (L.). O. muricata is small and lays small eggs which hatch as poorly-developed planktotrophic veliger larvae. A. proxima is larger and reproduces by means of larger eggs which hatch, as well-developed lecithotrophic larvae, that can metamorphose within approximately 24 h of release. A. proxima larvae can feed in the plankton, but do not require extrinsic nutrition to undergo complete development. Both species spawn in February–april, and have a strictly annual life-cycle. Comparisons of the calorific content of spawn have shown that A. proxima apportions a greater number of calories to reproduction, but that O. muricata makes a greater relative effort. A. proxima shown considerable individual variability in reproductive effort, which fails to correlate with, body size or rate of spawning. A more deterministic situation applies to O. muricata, because body size and fecundity follow an allometric relationship. It appears that there is a threshold of absolute energy required to support the lecithotrophic larval strategy in nudibranchs, and that this is not attained by the smaller species, O. muricata. A. proxima thus appears to have both reproductive strategies open to it, and to have adopted lecithotrophy in order to offset the unpredictability of energy available for reproduction.

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Authors and Affiliations

  1. Wellcome Marine Laboratory, University of Leeds, Robin Hood's Bay, North Yorkshire, England

    C. D. Todd

  2. Department of Marine Biology, University College of North Wales, Marine Science Laboratories, Menai Bridge, Gwynedd, N. Wales, UK

    C. D. Todd

  3. Gatty Marine Laboratory, University of St. Andrews, KY16 8LB, St. Andrews, Fife, Scotland

    C. D. Todd

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Communicated by J. M. Mauchline, Oban

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Todd, C.D. Reproductive energetics of two species of dorid nudibranchs with planktotrophic and lecithotrophic larval strategies. Mar. Biol. 53, 57–68 (1979). https://doi.org/10.1007/BF00386529

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