First mitochondrial DNA analysis of the spectacled porpoise (Phocoena dioptrica) from Tierra del Fuego, Argentina

Pimper, Lida E.; Goodall, Rae Natalie Prosser; Remis, María Isabel

doi:10.1016/j.mambio.2012.02.002

Cited by 7 publications

(5 citation statements)

References 22 publications

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“…Other marine mammals from the region also exhibited recent demographic expansion 23 , 24 , 26 – 28 likely associated with the LGM and sea ice retreat, around 15,000 years ago (as it is reported here based on Bayesian skyline reconstruction analysis). Habitat changes including changes in the distribution and abundance of prey are likely to have taken place during this period.…”

Section: Discussionsupporting

confidence: 78%

“…The Last Glacial Maximum (LGM) at the end of the Pleistocene is one of the largest global environmental changes and had significant impact on the genetic diversity of many natural populations of top predators 19 . After the LGM, many populations of marine mammals showed demographic expansion both in the northern and southern hemispheres, such as narwhals Monodon monoceros 20 , belugas Delphinapterus leucas 21 , bowhead whales Balaena mysticetus 22 , South American fur seal Arctocephalus australis 23 , South American sea lion Otaria flavescens 24 , 25 , southern right whale Eubalaena australis 26 , dusky dolphin Lagenorhynchus obscurus 27 , and spectacled porpoise Phocoena dioptrica 28 . These historical climatic fluctuations, characterized by periods of contraction and retraction, have been suggested to be the primary driving factor behind the origin and radiation of some species from the southern hemisphere, e.g., those that are involved in the genus Cephalorhynchus 29 .…”

Section: Introductionmentioning

confidence: 99%

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Commerson’s dolphin population structure: evidence for female phylopatry and male dispersal

Durante

Castro

McCracken

et al. 2022

Sci Rep

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A key in species conservation is understanding the amount and distribution of genetic diversity and how environmental changes that occurred in the recent past may have influenced current patterns of population structure. Commerson’s dolphin, Cephalorhynchus commersonii, has two subspecies, one of which is endemic to South America (C. commersonii commersonii) and little is known about its population genetics. Our objective was to investigate the population genetics of this subspecies throughout its distribution. Using 70 skin samples and information available in GenBank, 308 mitochondrial DNA sequences and 28 species-specific microsatellites were analyzed. The species presented low genetic diversity when compared to other dolphin species, but was consistent with other species within the genus. Strong population structure based on mitochondrial DNA was exhibited throughout its entire distribution, a pattern consistent with female philopatry. However, this pattern was not detected when using microsatellites, suggesting male-mediated gene flow. Demographic tests suggested a population expansion beginning approximately 15,000 years ago, after the Last Glacial Maximum. In a climate change scenario, we recommended considering each sampling location as an independent population management unit in order to evaluate the impact of possible environmental changes on the distribution of genetic information within the species.

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Section: Discussionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Commerson’s dolphin population structure: evidence for female phylopatry and male dispersal

Durante

Castro

McCracken

et al. 2022

Sci Rep

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“…This is in part due to the limited number of observations and access to biological data (but see Refs. 26,27,99 ), especially for the spectacled porpoise. Despite these limitations, our study revealed that the patterns and processes described for the finless porpoise and harbor porpoise may apply also to the majority of the other porpoise species.…”

Section: Discussionmentioning

confidence: 99%

Mitochondrial genomics reveals the evolutionary history of the porpoises (Phocoenidae) across the speciation continuum

Chehida

Thumloup

Schumacher

et al. 2020

Sci Rep

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Historical variation in food resources is expected to be a major driver of cetacean evolution, especially for the smallest species like porpoises. Despite major conservation issues among porpoise species (e.g., vaquita and finless), their evolutionary history remains understudied. Here, we reconstructed their evolutionary history across the speciation continuum. Phylogenetic analyses of 63 mitochondrial genomes suggest that porpoises radiated during the deep environmental changes of the Pliocene. However, all intra-specific subdivisions were shaped during the Quaternary glaciations. We observed analogous evolutionary patterns in both hemispheres associated with convergent evolution to coastal versus oceanic environments. This suggests that similar mechanisms are driving species diversification in northern (harbor and Dall’s) and southern species (spectacled and Burmeister’s). In contrast to previous studies, spectacled and Burmeister’s porpoises shared a more recent common ancestor than with the vaquita that diverged from southern species during the Pliocene. The low genetic diversity observed in the vaquita carried signatures of a very low population size since the last 5,000 years. Cryptic lineages within Dall’s, spectacled and Pacific harbor porpoises suggest a richer evolutionary history than previously suspected. These results provide a new perspective on the mechanisms driving diversification in porpoises and an evolutionary framework for their conservation.

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“…Between 2010 and 2022 we only found one study focusing on the spectacled porpoise. In this work, researchers sequenced a fragment of the mtDNA CR from 50 stranded individuals from Tierra del Fuego, Argentina (Pimper et al, 2012). Since most of the samples used in this study came from highly degraded samples, including dry skin, bones and teeth, a short fragment was sequenced (380 bp).…”

Section: Cetacea Odontoceti Family Phocoenidaementioning

confidence: 99%

Latin American aquatic mammals: an overview of 12 years focusing on molecular techniques applied to conservation

Castro

Caballero

Cunha

et al. 2023

Lat. Am. J. Aquat. Mamm.

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Ecological information useful for conservation purposes have benefitted from recent and rapid advancements in genetic techniques, revealing unknown aspects of behavior, natural history, population structure and demography of several aquatic mammal species, many of them with conservation concerns. Molecular markers have been used to define management units, to settle taxonomic uncertainties, to control illegal wildlife trade, among others, providing valuable information to decision-making to conserve and manage aquatic mammals. We review genetic studies applied to conservation-related issues involving natural populations of more than 40 species of aquatic mammals in Latin America, covering four taxonomic groups. The main goal was to assess which genetic approaches have been used and to identify gaps in genetic research relating to geographic areas and species. We reviewed studies published in peer-reviewed journals between 2011 and 2022, and found that most were focused on population structure, phylogeography, gene flow and dispersal movements. The review revealed that researchers need to increase and improve the knowledge in those species which face major conservation concern. Scarce findings were related to forensics and its application to wildlife trade. In the era of next-generation-sequencing techniques, just a few studies used genomics as a tool for monitoring gene diversity, an important goal to help us predict how species will cope with climate change events. Looking to the future we suggest which species, geographic areas and genetic studies should be prioritized in a scenario of climate change and increased human threats (e.g., fishery bycatch, habitat degradation, etc.) and the urgent need for conservation actions. Finally, we highlight the benefits of the collaborative works and the necessity of generating a conservation genetic network, with an open agenda to discuss the local and regional problematics. All in all, we strongly emphasize the generation of critical information towards the effective conservation and management of aquatic mammals in Latin America.

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First mitochondrial DNA analysis of the spectacled porpoise (Phocoena dioptrica) from Tierra del Fuego, Argentina

Cited by 7 publications

References 22 publications

Commerson’s dolphin population structure: evidence for female phylopatry and male dispersal

Commerson’s dolphin population structure: evidence for female phylopatry and male dispersal

Mitochondrial genomics reveals the evolutionary history of the porpoises (Phocoenidae) across the speciation continuum

Latin American aquatic mammals: an overview of 12 years focusing on molecular techniques applied to conservation

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