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Population ecology of the low-shore chitons Onithochiton quercinus and Plaxiphora albida

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Abstract

Populations of two chitons, Onithochiton quercinus (Gould, 1846) and Plaxiphora albida (Blainville, 1825) were sampled at five sites in the low-shore algal community at Cape Banks, New South Wales, Australia, from January 1985 to February 1988. Both species were abundant, reaching densities of 96 and 45 m-2, respectively and grew to 80 mm in length. O. quercinus and P. albida were found on the solitary ascidian Pyura stolonifera and on the substratum in amongst the foliose macroalgae which dominate this community. Size-frequency data were used to estimate the rates of growth, mortality and longevity, and time of recruitment. Growth of both species was rapid for the first 3 yr and slowed thereafter. O. quercinus and Plaxiphora albida had similar longevities and were estimated to live for at least 6 yr. Reproductive samples were also collected to identify when sexual maturity occurred, to clarify the reproductive periodicity, and to examine the sex ratios of the two species. Both species spawned over a discrete period in early autumn and there was no evidence of the bi-annual spawning reported in a previous study. Recruitment of O. quercinus and P. albida occurred during autumn, but recruits could not be quantified owing to their cryptic nature. The microhabitats occupied by the recruits of both species included the empty shells of the barnacle Austromegabalanus nigrescens, the spaces between the calcareous tubes of the polychaete Galeolaria caespitosa, and the space amongst the algae on Pyura stolonifera. Both species reached reproductive maturity at 2 yr of age. The sex ratios of both species were consistent with the results of a previous study: P. quercinus had a sex ratio of almost 2:1 biased in favour of males, and Plaxiphora albida exhibited a sex ratio of 1:1. The study suggested that populations of O. quercinus and P. albida could persist in the low-shore algal community in the absence of recruitment. This, together with their large size and consumption of macroalgae suggests that they have the potential to affect the structure and dynamics of this intertidal community.

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  1. N. M. Otway

    Present address: Fisheries Research Institute, P.O. Box 21, 2230, Cronulla, New South Wales, Australien

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  1. Institute of Marine Ecology, University of Sydney, 2006, Sydney, New South Wales, Australia

    N. M. Otway

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Communicated by G. F. Humphrey, Sydney

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Otway, N.M. Population ecology of the low-shore chitons Onithochiton quercinus and Plaxiphora albida . Marine Biology 121, 105–116 (1994). https://doi.org/10.1007/BF00349479

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