Skip to main content
placeholder image

Long term trends in population dynamics and reproduction in Holothuria atra (Aspidochirotida) in the southern Great Barrier Reef; the importance of asexual and sexual reproduction

Journal Article


Abstract


  • Population density and the presence of fission products of Holothuria (Halodeima) atra were investigated in surveys taken over 5 years (2006-2010) in the Capricorn Bunker Group, Southern Great Barrier Reef. These surveys were undertaken to document population density over time and assess the potential that asexual reproduction contributes to population maintenance. Over the 5 years a low incidence of fission was evident year-round, with an increase in July and August (13 and 27% of the population, respectively). There was a positive correlation between population density and the presence of fission products across all surveys. Although density fluctuated, there was no significant difference between months or sites. Despite the potential increase that might be expected from fission followed by regeneration, density fluctuated around a mean of 0.77 ind. m-2. Examination of gonads of the small (asexual and sexual reproduction) and large (sexual only) morphs of H. atra indicated a difference in reproductive pattern. Many small morphs lacked gonads during winter and, when they developed gonads, the gonad index (GI) was low. The GI pattern of the small morph indicated that they spawned in summer. In comparison the large morph had conspicuous gonads through the year. The GI of the large morph was high in winter and summer indicating greater, more prolonged spawning activity in these individuals. Copyright © Marine Biological Association of the United Kingdom 2012.

Publication Date


  • 2013

Citation


  • Thorne, B. V., Eriksson, H., & Byrne, M. (2013). Long term trends in population dynamics and reproduction in Holothuria atra (Aspidochirotida) in the southern Great Barrier Reef; the importance of asexual and sexual reproduction. Journal of the Marine Biological Association of the United Kingdom, 93(4), 1067-1072. doi:10.1017/S0025315412000343

Scopus Eid


  • 2-s2.0-84877771049

Web Of Science Accession Number


Start Page


  • 1067

End Page


  • 1072

Volume


  • 93

Issue


  • 4

Abstract


  • Population density and the presence of fission products of Holothuria (Halodeima) atra were investigated in surveys taken over 5 years (2006-2010) in the Capricorn Bunker Group, Southern Great Barrier Reef. These surveys were undertaken to document population density over time and assess the potential that asexual reproduction contributes to population maintenance. Over the 5 years a low incidence of fission was evident year-round, with an increase in July and August (13 and 27% of the population, respectively). There was a positive correlation between population density and the presence of fission products across all surveys. Although density fluctuated, there was no significant difference between months or sites. Despite the potential increase that might be expected from fission followed by regeneration, density fluctuated around a mean of 0.77 ind. m-2. Examination of gonads of the small (asexual and sexual reproduction) and large (sexual only) morphs of H. atra indicated a difference in reproductive pattern. Many small morphs lacked gonads during winter and, when they developed gonads, the gonad index (GI) was low. The GI pattern of the small morph indicated that they spawned in summer. In comparison the large morph had conspicuous gonads through the year. The GI of the large morph was high in winter and summer indicating greater, more prolonged spawning activity in these individuals. Copyright © Marine Biological Association of the United Kingdom 2012.

Publication Date


  • 2013

Citation


  • Thorne, B. V., Eriksson, H., & Byrne, M. (2013). Long term trends in population dynamics and reproduction in Holothuria atra (Aspidochirotida) in the southern Great Barrier Reef; the importance of asexual and sexual reproduction. Journal of the Marine Biological Association of the United Kingdom, 93(4), 1067-1072. doi:10.1017/S0025315412000343

Scopus Eid


  • 2-s2.0-84877771049

Web Of Science Accession Number


Start Page


  • 1067

End Page


  • 1072

Volume


  • 93

Issue


  • 4