Phylogeography from South-Western Atlantic Ocean: Challenges for the Southern Hemisphere

García, Graciela

doi:10.5772/36390

Cited by 4 publications

(9 citation statements)

References 40 publications

(42 reference statements)

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“…AMOVA based on cyt b gene failed to detect any population genetic structure for S . guggenheim , as previously reported (García, ). Similar results were found in M .…”

Section: Discussionsupporting

confidence: 86%

“…S, polymorphic segregating sites; Haplotype diversity (h = gene) (Nei, 1987); , nucleotide diversity (Nei, 1987); D, neutrality test (Tajima, 1989); F s , neutrality test (Fu, 1997); r, overall transition:transversion bias. *Polymorphism data previously reported in García (2012).…”

Section: G E N E T I C Va R I At I O N I N T H E M I T O C H O N D R mentioning

confidence: 76%

“…The low haplotype diversity and relatively high nucleotide diversity in the S . guggenheim cyt b data set have been previously reported (García, ). The levels of haplotype diversity found for both markers are among the lowest found in sharks and they are similar to those reported for Mustelus schmitti Springer 1939 (Pereyra et al , ), Carcharhinus limbatus (Müller & Henle 1839), Rhizoprionodon porosus (Poey 1861) and Sphyrna tudes (Valenciennes 1822) (Tavares et al , ) using the same mitochondrial marker.…”

Section: Discussionmentioning

confidence: 99%

“…Distribution map and sampling sites for Squatina guggenheim in the south‐west Atlantic Ocean. (a) Bathymetry map [, the main currents: A, warm Brazil Current from the north; B, the cold Falkland (Malvinas) Current from the south; C, subtropical convergence; D, the Subtropical Shelf Front in the border of the Río de la Plata and its maritime front as part of the south‐west Atlantic continental shelf] (modified from García, ). (b) Distribution of 10 sampling sites belonging to three areas: Río de la Plata mouth, Outer shelf and Atlantic coast.…”

Section: Methodsmentioning

confidence: 99%

“…throughout the world. Among mitochondrial genes in phylogeographic studies, the cyt b gene has a great utility to resolve phylogenetic relationships in several taxonomic levels (Kocher et al, 1989;Cantatore et al, 1994) and it has been used in many population genetic studies of sharks (Murray et al, 2008;Pereyra et al, 2010;García, 2012;Tavares et al, 2013). This maternally inherited molecular marker in conjunction with the use of the coalescent theory provides a retrospective reconstruction of phylogenetic relationships among closely related populations in a past recent time.…”

Section: Introductionmentioning

confidence: 99%

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Population structure of Squatina guggenheim (Squatiniformes, Squatinidae) from the south‐western Atlantic Ocean

García

Pereyra

Gutiérrez

et al. 2014

Journal of Fish Biology

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Population genetic analyses based on both mitochondrial cytochrome b and the internal transcribed spacer 2 of recombinant (r)DNA genes were implemented to examine hypotheses of population differentiation in the angular angel shark Squatina guggenheim, one of the four most-widespread endemic species inhabiting coastal ecosystems in the south-western Atlantic Ocean. A total of 82 individuals of S. guggenheim from 10 sampling sites throughout the Río de la Plata mouth, its maritime front, the outer shelf at the subtropical confluence and the coastal areas of the south-west Atlantic Ocean, were included. The analysis of molecular variance (AMOVA) based on the second internal transcribed spacer (its-2) region supports that the samples from the outer shelf represent an isolated group from other sites. Historical gene flow in a coalescent-based approach revealed significant immigration and emigration asymmetry between sampling sites. Based on the low level of genetic diversity, the existence of a long-term population decline or a past recent population expansion following a population bottleneck could be proposed in S. guggenheim. This demographic differentiation suggests a degree of vulnerability to overexploitation in this endemic and endangered south-west Atlantic Ocean shark, given its longevity and low reproductive potential.

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“…AMOVA based on cyt b gene failed to detect any population genetic structure for S . guggenheim , as previously reported (García, ). Similar results were found in M .…”

Section: Discussionsupporting

confidence: 86%

Section: G E N E T I C Va R I At I O N I N T H E M I T O C H O N D R mentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Population structure of Squatina guggenheim (Squatiniformes, Squatinidae) from the south‐western Atlantic Ocean

García

Pereyra

Gutiérrez

et al. 2014

Journal of Fish Biology

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The mitochondrial gene COI reveals the origin of the introduction of Platanichthys platana (Regan, 1917) (Clupeiformes, Clupeidae) in a neotropical floodplain

et al. 2022

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The first records of Platanichthys platana in the upper Rio Paraná floodplain (URPF) date to 2012, but variations in the body length of specimens collected from this basin have since generated uncertainty about their identity and origin of introduction. This study aimed to genetically characterize populations of P. platana in different river basins, assess haplotype diversity, and determine the origin of the introduced population in the URPF. Sequences from the COI region were used to calculate genetic distances, construct gene trees, and identify haplotype networks. Eight haplotypes were found, several of which were exclusive to the coastal basins of Santa Catarina and Rio Grande do Sul, and the Río Negro basin (Río Yí). The Río de La Plata and Mar Chiquita basins, and upper Rio Paraná floodplain shared haplotypes. Based on the results of our analysis, we concluded that the URPF specimens were introduced from populations in Argentina.

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Phylogeography of the Endangered Franciscana Dolphin: Timing and Geological Setting of the Evolution of Populations

et al. 2022

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Phylogeography from South-Western Atlantic Ocean: Challenges for the Southern Hemisphere

Cited by 4 publications

References 40 publications

Population structure of Squatina guggenheim (Squatiniformes, Squatinidae) from the south‐western Atlantic Ocean

Population structure of Squatina guggenheim (Squatiniformes, Squatinidae) from the south‐western Atlantic Ocean

The mitochondrial gene COI reveals the origin of the introduction of Platanichthys platana (Regan, 1917) (Clupeiformes, Clupeidae) in a neotropical floodplain

Phylogeography of the Endangered Franciscana Dolphin: Timing and Geological Setting of the Evolution of Populations

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