The importance of mating system in translocation programs: reproductive success of released male bridled nailtail wallabies

Sigg, Dominique P.; Goldizen, Anne W.; Pople, Anthony

doi:10.1016/j.biocon.2004.11.017

Cited by 55 publications

(62 citation statements)

References 34 publications

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“…In the field, samples were preserved in either 20% dimethyl sulfoxide-NaCl 2 solution (Kilpatrick, 2002) or 80% ethanol. DNA extraction was performed according to Sigg et al (2005).…”

Section: Sample Collectionmentioning

confidence: 99%

Molecular detection of hybridization between sympatric kangaroo species in south-eastern Australia

et al. 2009

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Introgressive hybridization has traditionally been regarded as rare in many vertebrate groups, including mammals. Despite a propensity to hybridize in captivity, introgression has rarely been reported between wild sympatric macropodid marsupials. Here we investigate sympatric populations of western (Macropus fuliginosus) and eastern (Macropus giganteus) grey kangaroos through 12 autosomal microsatellite loci and 626 bp of the hypervariable mitochondrial DNA (mtDNA) control region. M. fuliginosus and M. giganteus within the region of sympatry corresponded, both genetically and morphologically, to their respective species elsewhere in their distributions. Of the 223 grey kangaroos examined, 7.6% displayed evidence of introgression, although no F1 hybrids were detected. In contrast to captive studies, there was no evidence for unidirectional hybridization in sympatric grey kangaroos. However, a higher portion of M. giganteus backcrosses existed within the sample compared with M. fuliginosus. Hybridization in grey kangaroos is reflective of occasional breakdowns in species boundaries, occurring throughout the region and potentially associated with variable conditions and dramatic reductions in densities. Such rare hybridization events allow populations to incorporate novel diversity while still retaining species integrity.

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“…In the field, samples were preserved in either 20% dimethyl sulfoxide-NaCl 2 solution (Kilpatrick, 2002) or 80% ethanol. DNA extraction was performed according to Sigg et al (2005).…”

Section: Sample Collectionmentioning

confidence: 99%

Molecular detection of hybridization between sympatric kangaroo species in south-eastern Australia

et al. 2009

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“…The significant genetic differentiation detected among founders of ATL, but not PBO (see results) supports admixture of the ATL population at the time of foundation. Non-random mating may have occurred on ATL due to genetic or behavioral incompatibilities between animals from different geographic regions (Sigg et al 2005), resulting in loss of observed heterozygosity. The relatively stable levels of heterozygosity on PBO (Table 2; Fig.…”

Section: Genetic Effects Of Translocationsmentioning

confidence: 99%

“…The translocation of species that have suffered severe range reductions has often had limited success in establishing self-sustaining populations (Wolf et al 1998;Mock et al 2004;Sigg et al 2005). There are of course exceptions where well planned management actions have led to successful translocations (Morris et al 2003;Olsson 2007;Taylor and Jamieson 2008).…”

Section: Introductionmentioning

confidence: 99%

Effects of founder events on the genetic variation of translocated island populations: implications for conservation management of the northern quoll

Cardoso

Eldridge

Oakwood³

et al. 2008

Conserv Genet

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Translocation is a strategy commonly used to maximize the persistence of threatened species, but it may sometimes lead to undesirable genetic consequences. The northern quoll (Dasyurus hallucatus) is a carnivorous marsupial that is critically endangered in Australia's Northern Territory due to rapid population declines in areas recently colonized by the exotic cane toad Chaunus [Bufo] marinus. In 2003, 64 quolls were translocated to two offshore islands to establish insurance populations and reduce the species' risk of extinction. In this study, we assessed genetic diversity at five microsatellite loci in the translocated populations, two endemic islands and three mainland populations. In the short-term (three generations), the translocated populations showed a slight but non-significant reduction in genetic diversity (A = 4.1-4.2; H e = 0.56-0.59) compared to the mainland source populations (A = 5.0-8.4; H e = 0.56-0.71). In comparison, high genetic erosion was observed in the endemic island populations (A = 1.5-2.9; H e = 0.11-0.34). Genetic bottlenecks were detected on both endemic islands and in one mainland population, indicating recent reductions in population size. Our results are consistent with previous studies describing greater losses of genetic diversity on islands compared to mainland populations. Divergence from ancestral allele frequencies in the translocated populations also suggests effects due to founder events. This study, although short-term, highlights the importance of continued monitoring for detecting changes in genetic diversity over time and makes a significant contribution to our understanding of the effects of founder events on island populations.

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“…The free-ranging population was trapped 3-4 times a year from early 1997 to mid 2000, as described in Sigg et al (2005). All wild-born adults, sub-adults and juveniles (n=80) were given PIT tags and had a 3 mm tissue biopsy taken from one ear; adults were also given unique ear tags.…”

Section: Origins Of Released Animals and Samplingmentioning

confidence: 99%

Reduced genetic diversity and significant genetic differentiation after translocation: Comparison of the remnant and translocated populations of bridled nailtail wallabies (Onychogalea fraenata)

Sigg

2006

Conserv Genet

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Loss of genetic diversity and increased population differentiation from source populations are common problems associated with translocation programmes established from captive-bred stock or a small number of founders. The bridled nailtail wallaby is one of the most endangered macropods in Australia, having been reduced to a single remnant population in the last 100 years. A translocated population of bridled nailtail wallabies was established using animals sourced directly from the remnant population (wild-released) as well as the progeny of animals collected for a captive breeding programme (captive-bred). The aims of this study were to compare genetic diversity among released animals and their wild-born progeny to genetic diversity observed in the remnant population, and to monitor changes in genetic diversity over time as more animals were released into the population. Heterozygosity did not differ between the translocated and remnant population; however, allelic diversity was significantly reduced across all released animals and their wild-born progeny. Animals bred in captivity and their wild-born progeny were also significantly differentiated from the source population after just four generations. Wild-released animals, however, were representative of the source population and several alleles were unique to this group. Both heterozygosity and allelic diversity among translocated animals decreased over time with the additional release of captivebred animals, as no new genetic stock was added to the population. Captive breeding programmes can provide large numbers of animals for release, but this study highlights the importance of sourcing animals directly from remnant populations in order to maintain genetic diversity and minimise genetic drift.

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The importance of mating system in translocation programs: reproductive success of released male bridled nailtail wallabies

Cited by 55 publications

References 34 publications

Molecular detection of hybridization between sympatric kangaroo species in south-eastern Australia

Molecular detection of hybridization between sympatric kangaroo species in south-eastern Australia

Effects of founder events on the genetic variation of translocated island populations: implications for conservation management of the northern quoll

Reduced genetic diversity and significant genetic differentiation after translocation: Comparison of the remnant and translocated populations of bridled nailtail wallabies (Onychogalea fraenata)

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