Microdistribution within a population ofAcrocnida brachiata (Montagu), (Echinodermata: Ophiuroidea) in Little Killary, west coast of Ireland
Helgoländer Meeresuntersuchungen volume 52, pages 65–73 (1998)
Abstract
Acrocnida brachiata (Montagu), like many other infaunal ophiuroids, has a penchant for gregariousness. In Little Killary, a small embayment on the west coast of Ireland, it colonises an extensive tract of sandy inshore ground (ca 7 m depth), at densities of 150–200 individuals/m2. In the course of a two-year study, variation in regular suction-sampling returns prompted a detailed study of the species distribution pattern. Towards this end, 256 contiguous and stratified core samples were taken along a line of transect, in May 1995. These showed randomness with respect to the population at large, but exposed an aggregated distribution for juveniles and adults separately, at different levels within the sediment. Juveniles formed wide, ‘loose’ patches in the surficial deposit, while adults formed smaller, denseer patches deeper within the sediment. It remains to be seen what this approach may expose, when applied in different seasons, or during different phases of the species life cycle.
Literature Cited
Andrew, N. L. & Mapstone, B. D., 1987. Sampling and the description of spatial patterns in marine ecology.—Oceanogr. mar. Biol.25, 39–90.
Angel, H. H. & Angel, M. V., 1967. Distribution pattern analysis of a benthic community.—Helgoländer wiss. Meeresunters.15, 445–454.
Bourgoin, A., 1987. Écologie et démographie d'Acrocnida brachiata (Montagu) (Echinodermata; Ophiuroidea) en Baie de Douarnenez (Bretagne). Diss., Univ. de Bretagne Occidentale, Brest, 146 pp.
Bowmer, T., 1978. Aspects of the biology and ecology ofAcrocnida brachiata (Montagu) (Ophiuroidea: Echinodermata). B. Sc. Thesis, Natn. Univ. of Ireland, Galway, 95 pp.
Buchanan, J. B., 1967. Dispersion and demography of some infaunal echinoderm populations.— Symp. zool. Soc. Lond.20, 1–11.
Crisp, D. J., 1961. Territorial behaviour in barnacle settlement.—J. exp. Biol.38, 429–446.
Duineveld, G. C. A., Kunitzer, A. & Heyman, R. P., 1987.Amphiura filiformis (Ophiuroidea: Echinodermata) in the North Sea. Distribution, present and former abundance and size composition.—Neth. J. Sea Res.21, 317–329.
Elliot, J. M., 1971. Some methods for the statistical analysis of samples of benthic invertebrates.—Scient. Publs Freshwat. biol. Ass.25, 1–144.
Gage, J. D. & Coghill, G. G., 1977. Studies on the dispersion patterns of Scottish sea loch benthos from contiguous core transects. In: The ecology of marine benthos. Ed. by B. C. Coull, University of South Carolina Press, Columbia, S. C., 319–338.
Greig-Smith, P., 1952. The use of random and contiguous quadrats in the study of the structure of plant communities.—Ann. Bot.16, 293–316.
Heip, C., 1975. On the significance of aggregation in some benthic marine invertebrates. In: Ninth European Marine Biology Symposium. Ed. by H. Barnes. Aberdeen University Press, Aberdeen, 527–538.
Keegan, B. F., O' Connor, B. D. S. & Könnecker, G. F., 1985. Littoral and benthic investigations on the west coast of Ireland—XX. Echinoderm aggregations.—Proc. R. Ir. Acad.85B, 91–99.
Krebs, C. J., 1989. Ecological methodology. Harper Collins, New York, 654 pp.
Rosenberg, R., 1974. Spatial dispersion of an estuarine benthic faunal community.—J. exp. mar. Biol. Ecol.15, 69–80.
Thrush, S. F., 1991. Spatial patterns in soft-bottom communities.—Trends Ecol. Evolut.6, 75–79.
Warner, G. F., 1979. Aggregation in echinoderms. In: Biology and systematics of colonial organisms. Ed. by G. Corwood & B. R. Rosen. Acad. Press, London, 375–396.
Webb, C. M. & Tyler, P. A., 1985. Post-larval development of the common north-west European brittle starsOphiura ophiura, O. albida andAcrocnida brachiata (Echinodermata: Ophiuroidea).—Mar. Biol.89, 281–292.
Wilson, D. P., 1968. The settlement behaviour of the larvae ofSabellaria alveolata (L.).—J. mar. biol. Ass. U. K.48, 387–435.
Wilson, J. G., 1976. Dispersion ofTellina tenuis from Kames Bay, Millport, Scotland.—Mar. Biol.37, 371–376.
Woodin, S. A., 1976. Adult-larval interactions in dense infaunal assemblages: Patterns of abundance. —J. mar. Res.34, 25–41.
Woodley, J. D., 1975. The behaviour of some amphiurid brittle stars.—J. exp. mar. Biol. Ecol.18, 29–46.
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Makra, A., Keegan, B.F. Microdistribution within a population ofAcrocnida brachiata (Montagu), (Echinodermata: Ophiuroidea) in Little Killary, west coast of Ireland. Helgoländer Meeresunters. 52, 65–73 (1998). https://doi.org/10.1007/BF02908737
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DOI: https://doi.org/10.1007/BF02908737
Keywords
- Block Size
- Depth Level
- Surficial Sediment
- Suspension Feeder
- Brittle Star