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Effects of environment and population density on thesea anemone actinia tenebrosa

Journal Article


Abstract


  • Within each of four Western Australian colonies of A. tenebrosa, adults developed gonads and brooded asexually produced juveniles during the summer months. The brooded juveniles were releasedthroughout the year but most settlement occurred in autumn and winter. Dispersal of brooded juvenileswas highly localized and they typically settled within 2 m of adults. Adults were sedentary and long-lived and recruitment rates were extremely low (about 1% per annum during the study period). Adult size and asexual fecundity differed markedly between colonies over three breeding seasons, but between-colony comparisons revealed no simple relationship between those characteristics. Themean number of juveniles per adult varied up to ninefold between colonies. Sex ratios deviatedsignificantly from a ratio of 1: 1 in samples from three colonies, and males predominated in two ofthese. Density-manipulation experiments revealed that intraspecific competition affected adult size, sexual maturity, asexual fecundity and rates of settlement and recruitment. �� CSIRO 1984.

Publication Date


  • 1984

Citation


  • Ayre, D. J. (1984). Effects of environment and population density on thesea anemone actinia tenebrosa. Marine and Freshwater Research, 35(6), 735-746. doi:10.1071/MF9840735

Scopus Eid


  • 2-s2.0-0021557834

Start Page


  • 735

End Page


  • 746

Volume


  • 35

Issue


  • 6

Place Of Publication


Abstract


  • Within each of four Western Australian colonies of A. tenebrosa, adults developed gonads and brooded asexually produced juveniles during the summer months. The brooded juveniles were releasedthroughout the year but most settlement occurred in autumn and winter. Dispersal of brooded juvenileswas highly localized and they typically settled within 2 m of adults. Adults were sedentary and long-lived and recruitment rates were extremely low (about 1% per annum during the study period). Adult size and asexual fecundity differed markedly between colonies over three breeding seasons, but between-colony comparisons revealed no simple relationship between those characteristics. Themean number of juveniles per adult varied up to ninefold between colonies. Sex ratios deviatedsignificantly from a ratio of 1: 1 in samples from three colonies, and males predominated in two ofthese. Density-manipulation experiments revealed that intraspecific competition affected adult size, sexual maturity, asexual fecundity and rates of settlement and recruitment. �� CSIRO 1984.

Publication Date


  • 1984

Citation


  • Ayre, D. J. (1984). Effects of environment and population density on thesea anemone actinia tenebrosa. Marine and Freshwater Research, 35(6), 735-746. doi:10.1071/MF9840735

Scopus Eid


  • 2-s2.0-0021557834

Start Page


  • 735

End Page


  • 746

Volume


  • 35

Issue


  • 6

Place Of Publication