Abstract
We present the first fecundity and egg size data for three species of lithodid crab from Antarctic waters south of the Polar Front, caught in the fisheries operating around the island of South Georgia. In all species, fecundity was observed to increase with body size, but reproductive allocation was found to differ significantly between species. The highest relative fecundity (eggs−g body weight) and smallest egg size was found in Paralomis spinosissima, which is found in shallower waters, whereas the lowest relative fecundity values and largest eggs were recorded in the deeper living species, Neolithodes diomedeae. Evidence is presented that closely related sympatric species may employ quite different reproductive strategies that suit their depth distribution whilst indicating the overriding evolutionary adaptation of reproductive traits to temperature and food availability.
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Acknowledgements
The authors would like to thank the many CCAMLR observers who supplied specimens from commercial fishing vessels and the fisheries scientists at King Edward Point who analysed recent samples. S.Thatje and an anonymous referee provided comment that improved this manuscript. This work was conducted at the B.A.S., Applied Fisheries Laboratory, South Georgia, under contract to the Government of South Georgia and the South Sandwich Islands.
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Morley, S.A., Belchier, M., Dickson, J. et al. Reproductive strategies of sub-Antarctic lithodid crabs vary with habitat depth. Polar Biol 29, 581–584 (2006). https://doi.org/10.1007/s00300-005-0091-4
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DOI: https://doi.org/10.1007/s00300-005-0091-4