Abstract
The behaviour of 16 adult (8 male and 8 female) spanner crabs (Ranina ranina), collected off southern Queensland, Australia, was monitored continuously in captivity by closed-circuit television for fifteen months from September 1982. Spanner crabs spent most of the time buried in the substrate, emerging mainly only when food became available. They remained emerged for twice as long on feeding days as on days without food. Females responded significantly faster than males to the presence of food. Response was slowest in October and November. There was no correlation between temperature and response time. The average feeding time was 2.0 min (SE=0.12), with no significant difference between males and females. Crabs without food were aggressive towards crabs with food, which sometimes led to fighting and wounding. These interactions also could result in food being transferred from one individual to another. When males interacted, food was transferred more often than when either females, or males and females interacted. Around moulting, male crabs did not feed for 52 d (SE=9.0) and females for 22 d (SE=2.2). This habit would reduce the frequency with which newly moulted crabs are caught in the baited tangle nets used by commercial fishermen. In mating interactions, copulation was always initiated by the males. Males dug up other crabs but, apparently unable to distinguish the sex of these individuals, attempted copulation with either sex. The majority of copulations occurred between midday and midnight and in the period August to December. The frequency of copulations with a female increased 10 d before she extruded eggs, after which it dropped to zero for the following 41 to 50 d. Eggs were carried for 39 to 44 d in the period September to November. The females remained emerged for long periods before extruding their eggs, but the period shortened immediately afterwards. This behaviour would lead to low catchability of ovigerous females. Because females respond more rapidly than males to a food stimulus, they may be more catchable in baited nets than are males. It is concluded that seasonal changes in the behaviour of spanner crabs could affect the number caught by baited tangle nets and may influence the sex ratio in catches.
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Literature cited
Barnard, K. H.: Descriptive catalogue of South African decapod Crustacea. Ann. S. Afr. Mus. 38, 396–399 (1950)
Berzins, I. K. and R. L. Caldwell: The effect of injury on the agonistic behaviour of the stomatopod, Gonodactylus bredini (Manning). Mar. Behav. Physiol. 10, 83–96 (1983)
Chapman, C. J.: Ecology of juvenile and adult Nephrops. In: The biology and management of lobsters, pp 143–178. Ed. by J. S. Cobb and B. F. Phillips. New York: Academic Press 1980
Chittleborough, R. G.: Environmental factors affecting growth and survival of juvenile western rock lobsters Panulirus longipes (Milne Edw.). Aust. J. mar. Freshwat. Res. 26, 177–196 (1975)
Dunham, D. W.: The behaviour of decapod and stomatopod crustaceans: an overview. In: Studies in adaptation. The behaviour of higher Crustacea, pp 3–19. Ed by S. Rebach and D. W. Dunham. New York: John Wiley & Sons 1983
Fielding, A. and S. R. Haley: Sex ratio, size at reproductive maturity, and reproduction of the Hawaiian Kona crab Ranina ranina (Linnaeus) (Brachyura, Gymnopleura, Raninidae). Pacif. Sci. 30, 131–145 (1976)
Hartnoll, R. G.: Reproduction in the burrowing crab, Corystes cassivelaunus. Crustaceana 15, 165–170 (1968)
Hartnoll, R. G.: Mating in the Brachyura. Crustaceana 16, 161–181 (1969)
Hartnoll, R. G.: The biology of the burrowing crab, Corystes cassivelaunus. Bijdr. Dierk 42, 139–155 (1972)
Hartnoll, R. G.: The phyletic implications of spermathecal structure in the Raninidae (Decapoda, Brachyura). J. Zool., Lond. 187, 75–83 (1979)
Lipcius, R. N. and W. F. Herrnkind: Molt cycle alterations in behavior, feeding and diel rhythms of a decapod crustacean, the spiny lobster Panulirus argus. Mar. Biol. 68, 241–252 (1982)
Lipcius, R. N. and W. F. Herrnkind: Photoperiodic regulation and daily timing of spiny lobster mating behaviour. J. exp. mar. Biol. Ecol. 89, 191–204 (1985)
Onizuka, W. W.: Management and development investigations of the Kona crab Ranina ranina (Linnaeus), 28 pp. Hawaii: Division of Fish & Game, Department of Land and Natural Resources 1972
Rodhouse, D. M.: Experimental fishing for the spider crab Maia squinado: sea and laboratory trials. J. mar. biol. Ass. U.K. 64, 251–259 (1984)
Schembri, P. J.: Courtship and mating behaviour in Ebalia tuberosa. Crustaceana 45, 77–81 (1983)
Skinner, D. G. and B. J. Hill: Catch rate and emergence of male and female spanner crabs (Ranina ranina) in Australia. Mar. Biol. 91, 461–465 (1986)
Williams, M. J.: Natural food and feeding in the commercial sand crab Portunus pelagicus (Linnaeus, 1766) (Crustacea, Decapoda, Portunidae) in Moreton Bay. J. exp. mar. Biol. Ecol. 59, 165–176 (1982)
Williams, M. J. and B. J. Hill: Factors influencing pot catches and population estimates of the portunid crab Scylla serrata. Mar. Biol. 71, 187–192 (1982)
Zucker, N.: Courtship variation in the neo-tropical fiddler crab Uca deichmanni: another example of female incitation to male competition. Mar. Behav. Physiol. 10, 57–79 (1983)
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Communicated by J. Mauchline, Oban
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Skinner, D.G., Hill, B.J. Feeding and reproductive behaviour and their effect on catchability of the spanner crab Ranina ranina . Mar. Biol. 94, 211–218 (1987). https://doi.org/10.1007/BF00392933
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DOI: https://doi.org/10.1007/BF00392933