Hybridization Between Tammar Wallaby (Macropus eugenii) Populations From Western and South Australia

McKenzie, Louise; Cooper, D. W.

doi:10.1093/oxfordjournals.jhered.a023125

Cited by 14 publications

(8 citation statements)

References 8 publications

(13 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By discounting extant Australian populations as origins for the New Zealand founders, we have earmarked them as an important conservation resource for potentially restoring lost taxonomic diversity in Australia via reintroduction. population as the only extant representative of the South Australian tammar (McKenzie & Cooper, 1997). In the meantime instigation of a reintroduction program may be prudent, on the basis of the apparent uniqueness of the tammars in New Zealand, which have attained pest status and at various times are actively controlled (Warburton, 1986).…”

Section: Discussionmentioning

confidence: 99%

Microsatellites identify introduced New Zealand tammar wallabies (Macropus eugenii) as an ‘extinct’ taxon

Taylor

Cooper

1999

Animal Conservation

Self Cite

View full text Add to dashboard Cite

The range of the tammar wallaby (Macropus eugenii) has decreased substantially in Australia in recent times. Because two introduced populations in New Zealand may have descended from a now‐extinct Australian population(s), we investigated their origins using a novel approach. We combined data from seven highly polymorphic microsatellite markers with simulation modelling to infer the history and conservation value of the New Zealand populations. The microsatellite alleles in one New Zealand population (Rotorua) are merely a subset of those in the other (Kawau Is.), suggesting Rotorua had no immigrants from an independent source. However, in the Kawau Is. population (sample size 33–37), 37 alleles were absent that were present in the Kangaroo Is. (South Australia) population at frequencies ranging from 1–40%. The probability of those alleles being lost during a founding event from Kangaroo Is. was investigated using a program that simulates the genetic consequences of population size bottlenecks. Use of realistic bottleneck parameters resulted in probabilities approaching zero that the observed allele deficiencies in the Kawau population could have occurred randomly, identifying the New Zealand tammar wallabies as descendants of a distinct taxon that is no longer extant in Australia.

show abstract

Section: Discussionmentioning

confidence: 99%

Microsatellites identify introduced New Zealand tammar wallabies (Macropus eugenii) as an ‘extinct’ taxon

Taylor

Cooper

1999

Animal Conservation

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, despite their genetic divergence at neutral loci, SA and WA tammar wallabies are known to be fully inter-fertile (in captivity), with F1 and back-cross hybrids of both sexes showing normal fertility [28]. This is quite unlike the similarly divergent eastern and western grey kangaroos, where both pre- and post-mating reproductive isolation is more developed, including male hybrid sterility [81,82].…”

Section: Discussionmentioning

confidence: 99%

“…Previous genetic comparisons of the Kangaroo Island (SA) and Garden Island (WA) populations, using several techniques, revealed substantial differentiation (reviewed in [5], see also [25,26,27]), although captive mating trials demonstrated the complete fertility of F1 and back-cross hybrids of both sexes [28]. This combination of attributes was subsequently exploited [29] to enable the construction of the first comprehensive physical linkage map for a marsupial [30,31].…”

Section: Introductionmentioning

confidence: 99%

Extensive genetic differentiation detected within a model marsupial, the tammar wallaby (Notamacropus eugenii)

et al. 2017

View full text Add to dashboard Cite

The tammar wallaby (Notamacropus eugenii) is one of the most intensively studied of all macropodids and was the first Australasian marsupial to have its genome sequenced. However, comparatively little is known about genetic diversity and differentiation amongst the morphologically distinct allopatric populations of tammar wallabies found in Western (WA) and South Australia (SA). Here we compare autosomal and Y-linked microsatellite genotypes, as well as sequence data (~600 bp) from the mitochondrial DNA (mtDNA) control region (CR) in tammar wallabies from across its distribution. Levels of diversity at autosomal microsatellite loci were typically high in the WA mainland and Kangaroo Island (SA) populations (A = 8.9–10.6; He = 0.77–0.78) but significantly reduced in other endemic island populations (A = 3.8–4.1; He = 0.41–0.48). Autosomal and Y-linked microsatellite loci revealed a pattern of significant differentiation amongst populations, especially between SA and WA. The Kangaroo Island and introduced New Zealand population showed limited differentiation. Multiple divergent mtDNA CR haplotypes were identified within both SA and WA populations. The CR haplotypes of tammar wallabies from SA and WA show reciprocal monophyly and are highly divergent (14.5%), with levels of sequence divergence more typical of different species. Within WA tammar wallabies, island populations each have unique clusters of highly related CR haplotypes and each is most closely related to different WA mainland haplotypes. Y-linked microsatellite haplotypes show a similar pattern of divergence although levels of diversity are lower. In light of these differences, we suggest that two subspecies of tammar wallaby be recognized; Notamacropus eugenii eugenii in SA and N. eugenii derbianus in WA. The extensive neutral genetic diversity and inter-population differentiation identified within tammar wallabies should further increase the species value and usefulness as a model organism.

show abstract

“…The same reasoning can be applied to interactions between embryonic genes, which are extensively expressed by the paternal genome in the trophoblast and placenta (Constancia et al 2004), and maternal tissues of the mother's reproductive tract. F 2 hybrid rebound is evident in the Peromyscus crosses just discussed and appears to be a common feature of hybridization in flowering plants and mammals (Dawson 1965; Gray 1972; McKenzie & Cooper 1997; Tate et al 1997; Bradshaw et al 1998).…”

Section: Predictions and Preliminary Tests Of The Vdchmentioning

confidence: 92%

Viviparity‐driven Conflict

Zeh

2008

Annals of the New York Academy of Sciences

View full text Add to dashboard Cite

Equipped with Mendel's laws and only rudimentary knowledge of genes and genomes, the architects of the Modern Synthesis provided key insights into the dynamics of gene frequency change within populations. Extension of population genetic models to speciation identified Dobzhansky-Muller incompatibilities (negative epistatic interactions between genes from isolated populations) as the primary cause of hybrid inviability and sterility, a view consistent with empirical findings on the genetics of reproductive isolation in Drosophila. Although speciation models have become increasingly mathematically sophisticated, many remain based on an overly static concept of the genome, grounded in Mendelian genetics and devoid of potentially important biological details. A unifying theory of speciation therefore remains elusive, with debate over the relative importance of natural selection, sexual selection, sexual conflict, genetic drift, and selfish genetic elements in the evolution of reproductive isolation. Drawing on recent findings in molecular genetics and comparative genomics, we revisit, update, and extend the theory that reproductive mode plays a crucial role in shaping the speciation process. By providing a direct conduit for manipulation of the mother's physiology by genes expressed in the embryo, viviparity creates a postfertilization arena for genomic conflicts absent in species that lay eggs. In polyandrous species, viviparity-driven conflict (VDC) is likely to generate perpetual antagonistic coevolution between genes expressed during embryonic development and those involved in maternal reproductive physiology, thereby accelerating the rate at which postzygotic isolation evolves between populations. Moreover, in mammals and flowering plants, VDC has favored the evolution of genomic imprinting and a central role for epigenetic mechanisms in the regulation of antagonistic patterns of gene expression by maternally and paternally inherited genomes. VDC can account for the rapid rate at which mammals and viviparous fishes lose their ability to hybridize; the key role of the triploid endosperm in postzygotic reproductive isolation in flowering plants; and the kinds of traits, genes, and gene regulatory systems most critical to the evolution of postzygotic reproductive isolation in live-bearing species.

show abstract

Hybridization Between Tammar Wallaby (Macropus eugenii) Populations From Western and South Australia

Cited by 14 publications

References 8 publications

Microsatellites identify introduced New Zealand tammar wallabies (Macropus eugenii) as an ‘extinct’ taxon

Microsatellites identify introduced New Zealand tammar wallabies (Macropus eugenii) as an ‘extinct’ taxon

Extensive genetic differentiation detected within a model marsupial, the tammar wallaby (Notamacropus eugenii)

Viviparity‐driven Conflict

Contact Info

Product

Resources

About