Spatial and temporal genetic homogeneity of the Monterey Spanish mackerel,Scomberomorus concolor, in the Gulf of California

Abstract

The genetic homogeneity of the Monterey Spanish mackerel Scomberomorus concolor population in the Gulf of California was confirmed using nine nuclear microsatellite loci in combination with mitochondrial cytochrome b gene sequences. Samples were collected from the upper and central Gulf areas, representing the two main biogeographical regions of the Gulf. The analyses support the existence of a single panmictic population of S. concolor inhabiting the Gulf of California which in terms of fishery management represents a single genetic stock. Additionally, the contemporary effective population size estimated for the S. concolor population (Ne = 3056.9) was high and similar to another pelagic species. The gene flow seems to be bidirectional between the upper and central Gulf, which coincides with the seasonal movements between both regions related to spawning and feeding activities. A population expansion event was detected, which agrees with a colonization-expansion hypothesis of the S. concolor population in the Gulf.

Population genetic structure of Patagonian toothfish (Dissostichus eleginoides) in the Southeast Pacific and Southwest Atlantic Ocean

“…Consequently, it has often been assumed that speciation in the deep-sea occurred as a result of geographic isolation-by-distance (IBD; Wilson & Hessler, 1987 ). The apparent homogeneity of the marine environment (e.g., Bunawan et al, 2015 ; Magallón-Gayón, Diaz-Jaimes & Uribe-Alcocer, 2016 ) and the many dispersal mechanisms of marine organisms has led to the idea that most marine populations are open populations ( Cowen et al, 2000 ; Hedgecock, Barber & Edmands, 2007 ; Cowen & Sponaugle, 2009 ). Microevolutionary studies in deep-sea organisms have revealed that geographical gradients and bathymetry play an important role in population genetic structure ( Zardus et al, 2006 ; Jennings, Etter & Ficarra, 2013 ; Porobić et al, 2013 ; Baco et al, 2016 ; Shen et al, 2016 ).…”

Peer Review #2 of "Population genetic structure of Patagonian toothfish (Dissostichus eleginoides) in the Southeast Pacific and Southwest Atlantic Ocean (v0.2)"

“…The apparent homogeneity of the marine environment (e.g. Bunawan et al, 2015;Magallón-Gayón, Diaz-Jaimes & Uribe-Alcocer, 2016) and the many dispersal mechanisms of marine organisms has led to the idea that most marine populations are open populations (Cowen et al, 2000;Hedgecock, Barber & Edmands, 2007;Cowen & Sponaugle, 2009). Microevolutionary studies in deep-sea organisms have revealed that geographical gradients and bathymetry play an important role in population genetic structure (Zardus et al, 2006;Jennings, Etter & Ficarra, 2013;Porobić et al, 2013;Baco et al, 2016;Shen et al, 2016).…”

Resolved and Redeemed: A New Fleck to the Evolutionary Divergence in the Genus Scomberomorus Lacepède, 1801 (Scombridae) With Cryptic Speciation

“…Genetic studies have primarily aimed at genetic stock identifications or phylogeography of species from major fishing areas. The species in focus were Scomberomorus semifasciatus (Australia: Broderick et al, 2011), Scomberomorus brasiliensis (Western South Atlantic: da Cunha et al, 2020), Scomberomorus sierra (Eastern Pacific: Loṕez et al, 2010), Scomberomorus concolor (Gulf of California: Magalloń-Gayoń et al, 2016), Scomberomorus guttatus (Persian Gulf: Abedi et al, 2011), Scomberomorus cavalla (Brazil: Santa Brıǵida et al, 2007), etc. Of all the species, the most extensive investigation was performed on S. commerson using a wide range of mitochondrial and nuclear molecular markers in the Pacific (e.g., Sulaiman and Ovenden, 2010;Fauvelot and Borsa, 2011;Habib and Sulaiman, 2016) and in the rim countries of the Indian Ocean (e.g., Hoolihan et al, 2006;Abedi et al, 2012;Divya et al, 2018;Vineesh et al, 2018;Johnson et al, 2021).…”