Long-distance gene flow in a cooperative breeder detected in genealogies of mitochondrial DNA sequences

1993 ◽  
Vol 252 (1335) ◽  
pp. 177-185 ◽  
Keyword(s):  
Mitochondrial Dna ◽  
Gene Flow ◽  
Dna Sequences ◽  
Long Distance

Inferring population connectivity across the range of the purple-crowned fairy-wren (Malurus coronatus) from mitochondrial DNA and morphology: implications for conservation management

2012 ◽  
Vol 60 (3) ◽  
pp. 199 ◽  
Author(s):  
Anja Skroblin ◽  
Robert Lanfear ◽  
Andrew Cockburn ◽  
Sarah Legge
Keyword(s):  
Mitochondrial Dna ◽  
Gene Flow ◽  
Dna Sequences ◽  
Genetic Divergence ◽  
Conservation Management ◽  
Habitat Degradation ◽  
Morphological Difference ◽  
Population Connectivity ◽  
Isolated Populations ◽  
The Impact

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.

Long-distance gene flow and cross-Andean dispersal of lowland rainforest bees (Apidae: Euglossini) revealed by comparative mitochondrial DNA phylogeography

2004 ◽  
Vol 13 (12) ◽  
pp. 3775-3785 ◽  
Author(s):  
CHRISTOPHER W. DICK ◽  
DAVID W. ROUBIK ◽  
KARL F. GRUBER ◽  
ELDREDGE BERMINGHAM
Keyword(s):  
Mitochondrial Dna ◽  
Gene Flow ◽  
Long Distance ◽  
Lowland Rainforest

scholarly journals Ancient and modern DNA reveal dynamics of domestication and cross-continental dispersal of the dromedary

2016 ◽  
Vol 113 (24) ◽  
pp. 6707-6712 ◽  
Author(s):  
Faisal Almathen ◽  
Pauline Charruau ◽  
Elmira Mohandesan ◽  
Joram M. Mwacharo ◽  
Pablo Orozco-terWengel ◽  
...  
Keyword(s):  
Gene Flow ◽  
Ancient Dna ◽  
Dna Sequences ◽  
Arabian Peninsula ◽  
Long Distance ◽  
Ecological Zones ◽  
Genotype Information ◽  
Mitochondrial Genotype ◽  
History Of ◽  
Approximate Bayesian

Dromedaries have been fundamental to the development of human societies in arid landscapes and for long-distance trade across hostile hot terrains for 3,000 y. Today they continue to be an important livestock resource in marginal agro-ecological zones. However, the history of dromedary domestication and the influence of ancient trading networks on their genetic structure have remained elusive. We combined ancient DNA sequences of wild and early-domesticated dromedary samples from arid regions with nuclear microsatellite and mitochondrial genotype information from 1,083 extant animals collected across the species’ range. We observe little phylogeographic signal in the modern population, indicative of extensive gene flow and virtually affecting all regions except East Africa, where dromedary populations have remained relatively isolated. In agreement with archaeological findings, we identify wild dromedaries from the southeast Arabian Peninsula among the founders of the domestic dromedary gene pool. Approximate Bayesian computations further support the “restocking from the wild” hypothesis, with an initial domestication followed by introgression from individuals from wild, now-extinct populations. Compared with other livestock, which show a long history of gene flow with their wild ancestors, we find a high initial diversity relative to the native distribution of the wild ancestor on the Arabian Peninsula and to the brief coexistence of early-domesticated and wild individuals. This study also demonstrates the potential to retrieve ancient DNA sequences from osseous remains excavated in hot and dry desert environments.

Comment on a research note reporting new populations of the northern quoll in Western Australia

2016 ◽  
Vol 38 (1) ◽  
pp. 124 ◽  
Author(s):  
M. Westerman ◽  
P. A. Woolley
Keyword(s):  
Mitochondrial Dna ◽  
Gene Flow ◽  
Western Australia ◽  
Dna Sequences ◽  
Research Note ◽  
Range Extension ◽  
Maternal Gene

The recent report by Turpin and Bamford (2015) notes a range extension for northern quolls in the Pilbara Bioregion of Western Australia. Mitochondrial DNA sequences derived from five scats show that the new individuals nest within a clade containing all other Pilbara animals. Northern quolls from the Pilbara Bioregion are genetically distinct from congeners from the Kimberley Bioregion. We note that there is no evidence for maternal gene flow between these two regions.

scholarly journals Genetic consequences of being a dwarf: do evolutionary changes in life-history traits influence gene flow patterns in populations of the world’s smallest goldenrod?

2020 ◽  
Vol 126 (1) ◽  
pp. 163-177
Author(s):  
Shota Sakaguchi ◽  
Atsushi J Nagano ◽  
Masaki Yasugi ◽  
Hiroshi Kudoh ◽  
Naoko Ishikawa ◽  
...  
Keyword(s):  
Life History ◽  
Gene Flow ◽  
Genetic Structure ◽  
Seed Dispersal ◽  
Dna Sequences ◽  
Life History Traits ◽  
Population Divergence ◽  
Population Demography ◽  
Long Distance ◽  
Yakushima Island

Abstract Background and Aims Contrasting life-history traits can evolve through generations of dwarf plant ecotypes, yet such phenotypic changes often involve decreased plant size and reproductive allocation, which can configure seed dispersal patterns and, subsequently, population demography. Therefore, evolutionary transitions to dwarfism can represent good study systems to test the roles of life-history traits in population demography by comparing genetic structure between related but phenotypically divergent ecotypes. Methods In this study, we examined an ecotypic taxon pair of the world’s smallest goldenrod (stem height 2.6 cm) in alpine habitats and its closely related lowland taxon (30–40 cm) found on Yakushima Island, Japan. Genetic variation in chloroplast DNA sequences, nuclear microsatellites and genome-wide single-nucleotide polymorphisms were used to investigate 197 samples from 16 populations, to infer the population genetic demography and compare local genetic structure of the ecotypes. Key Results We found a pronounced level of genetic differentiation among alpine dwarf populations, which were much less geographically isolated than their lowland counterparts. In particular, several neighbouring dwarf populations (located ~500 m apart) harboured completely different sets of chloroplast haplotypes and nuclear genetic clusters. Demographic modelling revealed that the dwarf populations have not exchanged genes at significant levels after population divergence. Conclusions These lines of evidence suggest that substantial effects of genetic drift have operated on these dwarf populations. The low-growing stature and reduced fecundity (only 3.1 heads per plant) of the dwarf plants may have reduced gene flow and rare long-distance seed dispersal among habitat patches, although the effects of life-history traits require further evaluation using ecological approaches.

Separating population structure from population history: a cladistic analysis of the geographical distribution of mitochondrial DNA haplotypes in the tiger salamander, Ambystoma tigrinum.

Genetics ◽  
1995 ◽  
Vol 140 (2) ◽  
pp. 767-782 ◽  
Author(s):  
A R Templeton ◽  
E Routman ◽  
C A Phillips
Keyword(s):  
Mitochondrial Dna ◽  
Gene Flow ◽  
Range Expansion ◽  
Prior Information ◽  
Cladistic Analysis ◽  
Population History ◽  
Ambystoma Tigrinum ◽  
Restricted Gene Flow ◽  
Historical Events ◽  
Long Distance

Abstract Nonrandom associations of alleles or haplotypes with geographical location can arise from restricted gene flow, historical events (fragmentation, range expansion, colonization), or any mixture of these factors. In this paper, we show how a nested cladistic analysis of geographical distances can be used to test the null hypothesis of no geographical association of haplotypes, test the hypothesis that significant associations are due to restricted gene flow, and identify patterns of significant association that are due to historical events. In this last case, criteria are given to discriminate among contiguous range expansion, long-distance colonization, and population fragmentation. The ability to make these discriminations depends critically upon an adequate geographical sampling design. These points are illustrated with a worked example: mitochondrial DNA haplotypes in the salamander Ambystoma tigrinum. For this example, prior information exists about restricted gene flow and likely historical events, and the nested cladistic analyses were completely concordant with this prior information. This concordance establishes the plausibility of this nested cladistic approach, but much future work will be necessary to demonstrate robustness and to explore the power and accuracy of this procedure.

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