High genetic differentiation of Indo‐Pacific humpback dolphins (<i>Sousa chinensis</i>) along the Asian Coast of the Pacific Ocean

Dai, Yufei; Sakornwimon, Watchara; Chantra, Rachawadee; Zhao, Ludan; Wu, Fuxing; Aierken, Reyilamu; Kittiwattanawong, Kongkiat

doi:10.1002/ece3.8901

Cited by 3 publications

(2 citation statements)

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“…species/subspecies delimitation; Jefferson & Rosenbaum, 2014; Wang, Yang & Hung, 2015), population history (e.g. divergence, population structure; Zhao et al, 2021; Dai et al, 2022) and differentiation (e.g. genetic diversity, gene flow, isolation; Parra et al, 2018; Amaral et al, 2020; Lampert et al, 2021) of humpback dolphins.…”

Section: Genetics: Genetic Diversity and Population Isolationmentioning

confidence: 99%

Population distribution, connectivity and differentiation of Indo‐Pacific humpback dolphins in Chinese waters: Key baselines for improving conservation management

Liu

Lin

2023

Aquatic Conservation

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1. Humpback dolphins (Sousa spp.), throughout their distribution ranges, are often designated as flagship species for coastal ecosystem conservation. Most of the early research on humpback dolphins was carried out in Chinese waters, and in the last two decades, numerous studies have provided abundant conservationvaluable findings.2. In this study, a systematic review was conducted to gain a comprehensive understanding of the distributional ecology of humpback dolphins in Chinese waters, to establish an updated national knowledge base about key conservation baselines on this flagship species. 3. Currently, there are at least eight main distribution areas of humpback dolphins along the coast of southern China, representing a clear picture of place-based conservation units. However, the overall biogeographical distribution pattern is discontinuous, and existing marine protected areas are far from sufficient to protect these key areas for the survival of humpback dolphins. 4. Based on the photo-identification technique, cross-matching of humpback dolphin individuals revealed extremely low inter-population connectivity among most of the known populations. Genetic studies suggested that several examined populations have low haplotype diversity levels, with limited inter-population gene flow. Morphological and behavioural evidence also supports population differentiation among geographical locations.5. These findings provide key baselines for the promotion of conservation management initiatives for humpback dolphins in Chinese waters. All recognizable geographical populations, together with each key habitat, should be considered as independent conservation units. With small distribution areas, low genetic diversity and unfavourable geographical isolation, several populations may be at a high risk of regional extinction. 6. A country-led scheme with cross-regional collaboration is required for sciencebased, action-focused and timely conservation efforts. Future conservation management initiatives should aim to increase or at least maintain key habitats, inter-population connectivity, population-level genetic diversity and effective population size.

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Section: Genetics: Genetic Diversity and Population Isolationmentioning

confidence: 99%

Population distribution, connectivity and differentiation of Indo‐Pacific humpback dolphins in Chinese waters: Key baselines for improving conservation management

Liu

Lin

2023

Aquatic Conservation

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“…To my knowledge, it is not yet known how admixture of different clusters progresses by individual dispersal at the population level during density fluctuations. Clustering analysis has been used to evaluate the spatial genetic structure and admixture of lineages (Beichman et al, 2023 ; Dai et al, 2022 ; Flucher et al, 2021 ; Krojerová‐Prokešová et al, 2015 ). Only a few studies have revealed temporal changes in cluster admixture proportions.…”

Section: Introductionmentioning

confidence: 99%

Preservation of genetic diversity in a highly fragmented population of the gray‐sided vole Myodes rufocanus in an intensive farming region

Ishibashi

2023

Ecology and Evolution

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Individual dispersal plays an important role in preserving genetic diversity in density‐fluctuating populations of arvicoline rodents. When habitats are fragmented and dispersal between habitats is severely constrained, genetic diversity can be lost. Here, I investigated whether genetic diversity in the gray‐sided vole Myodes rufocanus was preserved in an intensive farming region in Japan, where voles inhabited isolated windbreak forests along the borders of plowed lands. Genetic structure was examined in 673 vole samples (330 in spring and 343 in fall) collected at 34 windbreak forests located 0.35–20 km apart. A part of the control region (425 bp) of mitochondrial DNA (mtDNA) was sequenced in 673 voles, yielding 76 haplotypes. Genetic differentiation of maternally inherited mtDNA among trapping sites was markedly lower in males than in females in both seasons, indicating strong male‐biased dispersal. Genotypes at six microsatellite DNA loci were determined in 494 voles (245 in spring and 249 in fall) from 18 trapping sites, and loci harbored 16–24 alleles. The mean number of alleles per locus (allelic diversity) at trapping sites was positively correlated with the number of examined individuals (density) in both seasons, and the relationship was very similar to that of a previous study performed in much less fragmented populations. The genetic differentiation of microsatellite DNA among trapping sites decreased considerably from spring to fall. In a STRUCTURE analysis with a most probable cluster number of two, closer trapping sites showed more similar mean values of cluster admixture proportions. The present findings indicate that gene flow among isolated windbreak forests, which occurred mainly by dispersal of males, was not restrained in this intensive farming region. Furthermore, the results suggest that genetic diversity in the study population was preserved as well as in less fragmented populations.

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High genetic differentiation of Indo‐Pacific humpback dolphins (Sousa chinensis) along the Asian Coast of the Pacific Ocean

Dai

Sakornwimon²,

Chantra³

et al. 2022

Ecology and Evolution

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High genetic differentiation of Indo‐Pacific humpback dolphins (Sousa chinensis) along the Asian Coast of the Pacific Ocean

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 3 publications

References 103 publications

Population distribution, connectivity and differentiation of Indo‐Pacific humpback dolphins in Chinese waters: Key baselines for improving conservation management

Population distribution, connectivity and differentiation of Indo‐Pacific humpback dolphins in Chinese waters: Key baselines for improving conservation management

Preservation of genetic diversity in a highly fragmented population of the gray‐sided vole Myodes rufocanus in an intensive farming region

High genetic differentiation of Indo‐Pacific humpback dolphins (Sousa chinensis) along the Asian Coast of the Pacific Ocean

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