Phylogeny and Genetic Divergence of Indian Himalayan Population of Anomala dimidiata (Coleoptera: Scarabaeidae) Inferred from Mitochondrial DNA Sequences

Knowledge of population structure and patterns of connectivity is required to implement effective conservation measures for the purple-crowned fairy-wren (Malurus coronatus), a threatened endemic of northern Australia. This study aimed to identify barriers to dispersal across the distribution of M. coronatus, investigate the impact that the recent declines may have on population connectivity, and propose conservation actions to maintain natural patterns of gene flow. Analysis of mitochondrial DNA sequences from 87 M. coronatus identified two phylogenetic clusters that corresponded with the phenotypically defined western (M. c. coronatus) and eastern (M. c. macgillivrayi) subspecies. The genetic divergence between these subspecies was consistent with isolation by a natural barrier to gene flow, and supports their separate conservation management. Within the declining M. c. coronatus, the lack of genetic divergence and only slight morphological difference between remnant populations indicates that populations were recently linked by gene flow. It is likely that widespread habitat degradation and the recent extirpation of M. c. coronatus from the Ord River will disrupt connectivity between, and dynamics within, remnant populations. To prevent further declines, conservation of M. coronatus must preserve areas of quality habitat and restore connectivity between isolated populations.

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Pattern of Genetic Divergence of Mitochondrial DNA Sequences in Biomphalaria tenagophila Complex Species Based on Barcode and Morphological Analysis

Schistosomiasis ◽

10.5772/25550 ◽

2012 ◽

Cited By ~ 5

Author(s):

Roseli Tuan ◽

Fernanda Pires ◽

Raquel Gardini Sanches Palasio ◽

Ricardo Dalla ◽

Marisa Cristina De Almeida Guimaraes

Keyword(s):

Mitochondrial Dna ◽

Dna Sequences ◽

Genetic Divergence ◽

Morphological Analysis ◽

Complex Species

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Extensive genetic divergence among populations of the Australian freshwater fish, Pseudomugil signifer (Pseudomugilidae), at different hierarchical scales

Marine and Freshwater Research ◽

10.1071/mf01107 ◽

2002 ◽

Vol 53 (5) ◽

pp. 897 ◽

Cited By ~ 23

Author(s):

Dugald J. McGlashan ◽

Jane M. Hughes

Keyword(s):

Mitochondrial Dna ◽

Freshwater Fish ◽

Dna Sequences ◽

Genetic Divergence ◽

Spatial Scales ◽

River System ◽

Genetic Subdivision ◽

History Of ◽

Allozyme Loci ◽

Australian Freshwater

The 'island' nature of river systems limits the possibility of dispersal in freshwater fish species, with many displaying extensive genetic subdivision across their ranges. We examined the population genetic structure of the predominantly freshwater fish, Pseudomugil signifer, at fine, medium and broad scales using allozyme and mitochondrial DNA techniques. Extensive genetic subdivision across the range (FST = 0.6) at six polymorphic allozyme loci was partitioned mostly among river-system drainages (42%). Patterns of mitochondrial DNA sequences, which mirrored previous taxonomic designations and a terrestrial biogeographic barrier, identified two major groups. The level of divergence between the groups implied a considerable period of isolation. At a more localized scale, significant genetic differences between adjacent drainages implied that flood events are not effective transport mechanisms and indicate that populations of P. signifer in different drainages are essentially independent units. The history of P.�signifer appears to be dominated, at different spatial scales, by long periods of isolation among drainages mediated by changes in sea-level, which merge and isolate drainages haphazardly over time. The chance nature of dispersal, coupled with isolation and potential population size fluctuations, probably leads to the observed complex patterns of genetic divergence.

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