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Genetic structure of fissiparous populations of Holothuria (Halodeima) atra on the Great Barrier Reef

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dc.contributor Australian Institute Of Marine Science (aims) en
dc.contributor Inst Hydrobiol & Fishereiwissensch
dc.contributor Australian Inst Marine Sci
dc.contributor Australian Institute Of Marine Science BALLMENT, E UTHICKE, S BENZIE, JAH 2017-03-21T01:17:10Z 2013-02-28T06:48:52Z 2013-02-28T06:48:52Z 2019-05-09T01:15:48Z 2017-03-21T01:17:10Z 2017-03-21T01:17:10Z 2013-02-28T06:48:52Z 2019-05-09T01:15:48Z 1998-08-01
dc.identifier 1347 en
dc.identifier.citation Uthicke S, Benzie JAH and Ballment E (1998) Genetic structure of fissiparous populations of Holothuria (Halodeima) atra on the Great Barrier Reef. Marine Biology. 132: 141-151. en
dc.identifier.issn 0025-3162
dc.description Link to abstract/full text - en
dc.description.abstract Allozyme variation at five polymorphic loci was surveyed in a total of 311 individuals of the sea cucumber Holothuria (Halodeima) atra (Jager, 1833) collected from two nearshore and two midshelf populations in the Great Barrier Reef in November 1996. Strong deviations in genotype frequencies from those expected under Hardy-Weinberg equilibrium, particularly a large number of heterozygote excesses, confirmed the occurrence of asexual reproduction. Females and males differed significantly in genotype frequencies as a result of differences in either the amount of fission in each sex or in the mortality of asexually produced recruits. The estimated maximum sexual input (number of sexually produced individuals: sample size = N*:N-i) to the two nearshore reefs (38 to 67%) was low relative to that to the two midshelf reefs (74 to 87%). The three ratios and G(o):G(e), N-go:N-i, N*:N-i, (where G(o) = observed genotypic diversity, G(e) = expected genotypic diversity, N-go = number of genotypes) considered to be indicators of the extent of asexual reproduction, showed a consistent trend in the degree of asexual reproduction similar to that derived from the number of regenerating individuals observed in the populations for which data were available. F-statistic analyses of clonal gene frequencies demonstrated that all populations received sexual recruits from the same gene pool. There was evidence of restricted sexual recruitment to the Fantome population, suggesting that asexual reproduction was dominant only in areas where sexual recruitment was limited by other factors.
dc.description.uri en
dc.language English
dc.language en en
dc.publisher Springer-Verlag en
dc.relation.ispartof Null
dc.relation.ispartof Marine Biology - pages: 132: 141-151 en
dc.relation.uri en
dc.subject Systematics
dc.subject Marine & Freshwater Biology
dc.subject Consequences
dc.subject Asteroidea
dc.subject Asexual Reproduction
dc.subject Actinia-tenebrosa
dc.subject Coscinasterias-calamaria
dc.subject Coral
dc.subject Echinodermata
dc.subject Acanthaster-planci
dc.subject Larval Dispersal
dc.title Genetic structure of fissiparous populations of Holothuria (Halodeima) atra on the Great Barrier Reef
dc.type journal article en
dc.identifier.doi 10.1007/s002270050380 en
dc.identifier.wos WOS:000075866100015

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