|Reproductive and larval biology of the sub-Antarctic hermit crab Pagurus compus reared in the laboratory|
Lovrich, G.A.; Thatje, S. (2006). Reproductive and larval biology of the sub-Antarctic hermit crab Pagurus compus reared in the laboratory. J. Mar. Biol. Ass. U.K. 86(4): 743-749
In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154, more
Crustacean larvae; Developmental stages; Larval development; Reproduction; Pagurus comptus White, 1847 [WoRMS]; PSW, Argentina, Tierra del Fuego, Beagle Channel [Marine Regions]; PSW, Chile, Tierra del Fuego, Beagle Channel [Marine Regions]; Marine
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Fecundity, hatching rhythm, and the planktotrophic larval development of the hermit crab Pagurus comptus from sub-Antarctic waters of the Beagle Channel (Tierra del Fuego) were studied under controlled laboratory conditions of temperature, light cycle, food supply, and salinity. Fecundity was low, ranging from 134 to 848 eggs per female (cephalotoraxic shield length, SL, 2.3-5.0 mm). Hatching observed in the laboratory ranged from 6 to 30 d. The larval development was studied in laboratory cultures fed with Artemia sp. nauplii and kept at constant 7.0 plus or minus 0.5 degree C. Larvae invariably passed through four zoeal instars and one megalopa stage. Mean durations of the zoeal stages I to IV were 14.3 plus or minus 1.8, 16.7 plus or minus 4.6, 23.2 plus or minus 6.5, 33.4 plus or minus 9.2 d, respectively. Combined with the 43.8 plus or minus 5.6 d recorded for the survived megalopae, we suggest that the complete larval development lasts about four months. Starved larvae, on average, survived for 22 plus or minus 8.1 d (maximum 38 d) by far exceeding the zoea I duration in fed larvae, but did not reach the moult to the zoea II stage. Unlike other sub-Antarctic decapods, which show a tendency towards abbreviated or endotrophic larval developments at high latitudes, hermit crabs, at their southernmost distributional limit on Earth, show an extended and fully planktotrophic larval development and thus need to synchronize larval release with short periods of high primary production.