Abstract
The natural diet and mode of feeding of the rock lobster Jasus lalandii (H. Milne Edwards) was determined in a rock-lobster sanctuary near Cape Town, South Africa. Field observations were tested and confirmed by means of aquarium studies. Rock lobsters feed mainly upon ribbed mussels Aulacomya ater (Molina), which comprise the largest component of the sessile benthic fauna. Mussel remains were found as the major constituent in 97% of the rock-lobster stomachs examined. The density of rock lobsters averaged 8,100 per hectare (0.81 m-2), while mussel biomass averaged more than 5 kg (wet whole weight) m-2 within the same depth range (12 to 30 m). More than 80% of the mussel biomass comprised large individuals between 60 and 90 mm in length. Large rock lobsters (mainly males) were capable of feeding on all sizes of mussels, although many of these were inaccessible to predation. Smaller rock lobsters became progressively more limited in the size range of mussels which they could crack open and consume. Competition between rock lobsters for small mussels appeared to be intense, as mussels of suitable size for feeding were generally in short supply to most of the rock-lobster population. Hence, feeding and growth rates of rock lobsters are likely to be affected by the relative population densities of predator and prey. Growth rates of rock lobsters could be limited by food supplies even in areas where mussel biomass is comparatively large.
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Literature Cited
Berry, P.F.: The biology of the spiny lobster Panulirus homarus (Linnaeus) off the East Coast of Southern Africa. Investl Rep. oceanogr. Res. Inst., Durban 28, 1–75 (1971)
Cooper, R.A., R.A. Clifford and D.C. Newell: Seasonal abundance of the American lobster Homarus americanus in the Boothbay region of Maine. Trans. Am. Fish. Soc. 104, 669–674 (1975)
Davis, G.E.: Effects of recreational harvest on a spiny lobster, Panulirus argus, population. Bull. mar. Sci. 27, 223–236 (1977)
Ebling, F.J., J.A. Kitching, L. Muntz and C.M. Taylor: The ecology of Loch Ine XIII. Experimental observations of the destruction of Mytilus edulis and Nucella lapillus by crabs. J. Anim. Ecol. 33, 73–82 (1964)
Ennis, G.P.: Food, feeding and condition of lobsters, Homarus americanus, throughout the seasonal cycle in Bonavista Bay, Newfoundland. J. Fish. Res. Bd Can. 30, 1905–1909 (1973)
Fielder, D.R.: The spiny lobster Jasus lalandei (H. Milne-Edwards), in South Australia. III. Food, feeding, and locomotor activity. Aust. J. mar. Freshwat. Res. 16, 351–367 (1965)
Griffiths, C.L. and J.A. King: Energetic costs of growth and gonad output in the ribbed mussel Aulacomya ater. (In preparation)
Heydorn, A.E.F.: The rock lobster of the South African west coast Jasus lalandii (H. Milne-Edwards). 2. Population studies, behaviour, reproduction, moulting, growth and migration. Investl Rep. Div. Sea Fish. S. Afr. 71, 1–52 (1969)
Hill, B.J.: Natural food, foregut clearance-rate and activity of the crab Scylla serrata. Mar. Biol. 34, 109–116 (1976)
Newman, G.G. and D.E. Pollock: Growth of the rock lobster Jasus lalandii and its relationship to benthos. Mar. Biol. 24, 339–346 (1974)
——: The population dynamics of rock lobster Jasus lalandii on two South African fishing grounds. Colln scient. Pap. int. Commn SE. Atl. Fish. 2, 175–187 (1977)
Paterson, N.F.: The behaviour of captive rock lobsters, Jasus lalandii (H. Milne-Edwards). Ann. S. Afr. Mus. 52, 225–265 (1969)
Pollock, D.E.: Growth of juvenile rock lobster Jasus lalandii (H. Milne-Edwards). Investl Rep. Sea Fish. Brch S. Afr. 106, 1–16 (1973)
Pollock, D.E.: Growth and production rates of the rock lobster Jasus lalandii (H. Milne-Edwards), 226 pp. Ph.D. thesis, University of the Witwatersrand, Johannesburg 1978
Shannon, L.V.: Hydrology of the south and west coasts of South Africa. Investl Rep. Div. Sea Fish. S. Afr. 58, 1–62 (1966)
Smale, M.J.: Migration, growth and feeding in the Natal rock lobster Panulirus homarus (Linnaeus). Investl Rep. oceanogr. Res. Inst., Durban 47, 1–56 (1978)
Street, R.J.: The New Zealand crayfish Jasus edwardsii (Hutton, 1875). An account of growth, moulting and movements in southern waters, with notes on reproduction and predators. Fish. tech. Rep. N.Z. mar. Dep. 30, 1–31 (1969)
Walne, P.R. and G.J. Dean: Experiments on predation by the shore crab, Carcinus maenas L., on Mytilus and Mercenaria. J. Cons. int. Explor. Mer 34, 190–199 (1972)
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Communicated by J. Mauchline, Oban
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Pollock, D.E. Predator-prey relationships between the rock lobster Jasus lalandii and the mussel Aulacomya ater at Robben Island on the Cape West Coast of Africa. Marine Biology 52, 347–356 (1979). https://doi.org/10.1007/BF00389076
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DOI: https://doi.org/10.1007/BF00389076