Population genetic structure of the short-beaked common dolphin from the Black Sea and the Turkish Straits System

Tonay, Arda M.; Uzun, Begüm; Dede, Ayhan; Öztürk, Ayaka Amaha; Danyer, Erdem; Danyer, Işıl Aytemiz; Bilgin, Sabri; Öztürk, Bayram; Bi̇lgi̇n, Raşi̇t

doi:10.1080/24701394.2020.1788008

Cited by 9 publications

(5 citation statements)

References 27 publications

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“…Another genetic study, using 15 microsatellite nuclear loci from three areas in the Mediterranean Sea (n = 43) and eight areas from the North-East (NE) Atlantic (n = 449), still did not find evidence of strong genetic population structure in European waters, possibly due to low analytical power or incomplete sampling (Moura, Sillero, & Rodrigues, 2012). A more recent study, using 366 bp of the mtDNA D-loop fragments from common dolphin sampled from the Black Sea, Turkish Straits, and Aegean Sea (n = 37), and then compared with previous stored GenBank genetic data for 100 Mediterranean and Black Sea samples and 250 East Atlantic Ocean samples, reiterates previous outcomes by indicating the sampling limitations that hinder complete understanding of the genetic population structure of D. delphis in the Mediterranean Sea (Tonay et al, 2016(Tonay et al, , 2020. In the meantime, the first complete mtDNA genome and resultant phylogeny of D. delphis has clearly distinguished it from the long-beaked form Delphinus capensis while revealing that these two species are closely related to Stenella coeruleoalba (Lee et al, 2018).…”

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confidence: 53%

The conservation of the endangered Mediterranean common dolphin (Delphinus delphis): Current knowledge and research priorities

Vella

Murphy

Giménez

et al. 2021

Aquatic Conservation

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1. Preservation of endangered species is now recognized as a relevant component of regional and global conservation actions achieved through the maintenance of the remaining populations in a favourable conservation status. The Mediterranean common dolphin (Delphinus delphis) is listed as an Endangered subpopulation in the International Union for Conservation of Nature Red List, with declining numbers in some of the areas where it has been studied for numerous years. Prey depletion, fisheries bycatch, pollution, health risks, and climate change are among the recognized threats that the species is facing in the region.2. The existing national, regional, and international legislation pertinent to Mediterranean countries should aid greater science-policy-management integration and support innovative research and monitoring towards effective conservation. The challenges inherent in studying the pelagic D. delphis should not preclude the use of long-term, year-round, multiplatform surveys, side by side with the latest molecular tools, which aid our understanding of its populations' genetic diversity, resistance to diseases, and resilience in a semi-enclosed fast-changing sea.3. Addressing the multiplicity of problems confronting the species requires collaborative effort at all levels to share and merge resources, data, and expertise more efficiently. In this review, we provide an overview of the current knowledge on the Mediterranean common dolphin, the main threats, and knowledge gaps that are priorities for addressing its conservation, while providing clear recommendations for effectively safeguarding the species and its habitat at both local and regional levels.

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mentioning

confidence: 53%

The conservation of the endangered Mediterranean common dolphin (Delphinus delphis): Current knowledge and research priorities

Vella

Murphy

Giménez

et al. 2021

Aquatic Conservation

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“…During the aerial surveys, and partially boat surveys, it was shown that the numbers of common dolphins in the Black Sea increase from west to east (Mikhalev 2008, Paiu et al 2019b). This variation is, however, unlikely to be caused by any population differentiation because this species is genetically highly uniform across its entire range in the Black Sea (Natoli et al 2008, Tonay et al 2020.…”

Section: Discussionmentioning

confidence: 99%

“…The Black Sea is home to three cetacean species with global distribution: the bottlenose dolphin (Tur siops truncatus), the short-beaked common dolphin (Delphinus delphis) and the harbour porpoise (Phoco ena phocoena). They are found in the entire Black Sea and the neighbouring Sea of Azov, the Kerch Strait and the Turkish Strait System (BSC 2008) and are thought to have colonized the region in the Late Pleistocene (Viaud-Martinez et al 2007, Tonay et al 2020. The Black Sea is an ecosystem heavily transformed by human activity presently and in the past.…”

Section: Introductionmentioning

confidence: 99%

Seasonal dynamics of occurrence and group size of three species of cetaceans (Delphinidae and Phocoenidae) on the southwestern coast of the Black Sea

Uluduz

Yanchukov

Sözen

2020

scimar

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The spatial and temporal occurrence of cetaceans in the Black Sea and particularly along its southwestern coastline is poorly studied. Based on a total of 609 encounters, we present the analysis of monthly dynamics of (1) the numbers of cetacean sightings and (2) their group size for all three Black Sea cetacean species: the bottlenose dolphin (Tursiops truncatus), the short-beaked common dolphin (Delphinus delphis) and the harbour porpoise (Phocoena phocoena) over a continuous period of 29 months (January 2018 - May 2020) from two fixed coastal observation points near the city of Zonguldak, Turkey. Seasonal fluctuations were found in the occurrence of all three species, with peaks in April-May (spring). Similarly, the largest groups of P. phocoena and T. truncatus were recorded in the late spring and early summer period, while D. delphis had a peak in July (summer). In case of the harbour porpoise, we speculate that these variations can be explained by the annual migrations from the northwestern to southern waters of the Black Sea, while the seasonal dynamics of the two Delphinidae species might depend on fish prey availability. While our data were collected locally, the results provide better insight into the ecology of cetaceans within the entire Black Sea.

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“…Tonay et al. (2020) assessed the population connectivity, evolutionary history, and conservation status of short‐beaked common dolphin using mitochondrial DNA D‐loop fragments. Genetic diversity and population structure of a cyprinid fish ( Ancherythroculter nigrocauda ) was performed using mitochondrial cytochrome b gene (cyt b ) and 13 microsatellite (SSR) loci (Zhai et al., 2019).…”

Section: Discussionmentioning

confidence: 99%

Morphological and Genetic variations in the natural populations of Carinotetraodon travancoricus

2021

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Carinotetraodon travancoricus or Malabar puffer fish is an endemic species described from rivers originating from the Western Ghats in South India. This species is captured extensively as an aquarium fish and is having substantial demand in global markets. However, being prone to overfishing and impacts of anthropogenic alterations in its habitats, IUCN has categorized it as a threatened/vulnerable species. Since, knowledge on variability of wild populations could help in their conservation and management, morphometric and genotypic analyses were carried out in natural populations of C. travancoricus inhabiting two geographically separated rivers Pamba and Chalakkudy. Mean values of eleven length parameters measured in 456 males and 439 females inhabiting these rivers revealed significant difference (ANOVA, F = 10.2 p < .001) between sexes and between females inhabiting two rivers. Principal component analysis revealed two factors in males and three factors in females, explained variance of 83.62% and 89.94% in respective sexes. Results of both PCA and discriminant function analysis indicated perceptibly high degree of separation between individuals inhabiting the two rivers. A total of 25 COI sequences were generated from C. travancoricus collected from rivers Pamba (n = 14) and Chalakkudy (n = 11). Sequence alignment revealed considerable base substitutions between samples from both rivers, indicating possibility of population differences. AMOVA analysis also provided significant Fst value (0.622; p‐value .00) in support of population difference between individuals of both rivers. Interpopulation genetic distance reached upto 2.50%, high enough to confirm genetic diversity among individuals, revealing perceptible population events within this species. The present results indicated high degree of population difference between C. travancoricus inhabiting geographically separated rivers Pamba and Chalakkudy as evidenced from both morphometric and genotypic analyses.

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Population genetic structure of the short-beaked common dolphin from the Black Sea and the Turkish Straits System

Cited by 9 publications

References 27 publications

The conservation of the endangered Mediterranean common dolphin (Delphinus delphis): Current knowledge and research priorities

The conservation of the endangered Mediterranean common dolphin (Delphinus delphis): Current knowledge and research priorities

Seasonal dynamics of occurrence and group size of three species of cetaceans (Delphinidae and Phocoenidae) on the southwestern coast of the Black Sea

Morphological and Genetic variations in the natural populations of Carinotetraodon travancoricus

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