Evidence of historical isolation and genetic structuring among broadnose sevengill sharks (Notorynchus cepedianus) from the world’s major oceanic regions

Schmidt-Roach, Alicia C. J.; Bruels, Christine C.; Barnett, Adam; Miller, Adam D.; Sherman, Craig D. H.; Ebert, David A.; Schmidt‐Roach, Sebastian; Silva, Charlene da; Wilke, Christopher G.; Thorburn, Craig Carpenter; Mangel, Jeffrey C.; Ezcurra, Juan M.; Irigoyen, Alejo Joaquín; Jaureguízar, Andrés Javier; Braccini, Matías; Alfaro‐Shigueto, Joanna; Duffy, Clinton; Shivji, Mahmood S.

doi:10.1007/s11160-021-09651-1

Cited by 3 publications

(8 citation statements)

References 80 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Indian Ocean lacks seamount/knoll stepping stones, predicted suitable habitats (except Amsterdam/Saint‐Paul Islands) and, besides the southwest corner of Australia (the very edge of N. cepedianus distribution in this region), has no confirmed presence of N. cepedianus . These findings coincide with those by Schmidt‐Roach et al (2021), who examined patterns of genetic structure (using mitochondrial and nuclear DNA) in the most well‐known N. cepedianus subpopulations across the world. Genetic connectivity was evident between southern Australia and New Zealand (Oceania), United States, and Peru (Eastern Pacific), and Argentina and South Africa (South Atlantic), but not between Oceania, Eastern Pacific or the South Atlantic (Schmidt‐Roach et al 2021).…”

Section: Discussionsupporting

confidence: 89%

“…These findings coincide with those by Schmidt‐Roach et al (2021), who examined patterns of genetic structure (using mitochondrial and nuclear DNA) in the most well‐known N. cepedianus subpopulations across the world. Genetic connectivity was evident between southern Australia and New Zealand (Oceania), United States, and Peru (Eastern Pacific), and Argentina and South Africa (South Atlantic), but not between Oceania, Eastern Pacific or the South Atlantic (Schmidt‐Roach et al 2021). Schmidt‐Roach et al (2021) proposed a historical divergence and subsequent isolation between Oceania, Eastern Pacific, and South Atlantic regions, which initiated near 0.55 Mya ago in the mid Pleistocene.…”

Section: Discussionsupporting

confidence: 89%

“…5). However, genetic connectivity appears to be evident across the equator between California and Peru (Schmidt‐Roach et al 2021), where no connectivity is predicted via seamounts/knolls across the equator (between Northeast and Southeast Pacific; Fig. 5).…”

Section: Discussionmentioning

confidence: 99%

“…Based on the different degrees of genetic isolation between global subpopulations of N. cepedianus (Schmidt‐Roach et al 2021), we were interested in testing whether seamounts and knolls may facilitate their connectivity via stepping stone‐like dispersal corridors. We assumed that buffer areas around seamounts may provide temporary demersal habitat suitability during rare events of drifting individuals from coastal areas, allowing them to surpass warm thermal barriers and oceanic pelagic environments.…”

Section: Methodsmentioning

confidence: 99%

“…The species N. primigenius represented the genus between the Oligocene‐Pliocene (Reinecke et al 2014), and seemed to have left the North Atlantic and Mediterranean around 4 Mya. At the global scale, patterns of genetic structure among most N. cepedianus subpopulations showed historical divergence and subsequent isolation between Oceania, Eastern Pacific, and South Atlantic basins (Schmidt‐Roach et al 2021), a pattern that is common to other globally distributed coastal shark species (Benavides et al 2011; Bester‐van der Merwe et al 2017). However, genetic connectivity within individual ocean basins was evident, and individual sharks can travel up to 1800 km implying highly mobile behavior and large regional displacements (Barnett et al 2011; Williams et al 2012; Larson et al 2015).…”

mentioning

confidence: 99%

See 4 more Smart Citations

Potential global distribution of a temperate marine coastal predator: The role of barriers and dispersal corridors on subpopulation connectivity

Wysiecki

Cortés

Jaureguízar

et al. 2022

Limnology & Oceanography

Self Cite

View full text Add to dashboard Cite

Predicting the potential distribution of species and possible dispersal corridors at a global scale can contribute to better understanding the availability of suitable habitat to move between, and the potential connectivity between regional distributions. Such information increases knowledge of ecological and biogeographic processes, but also has management applications at a global scale, for example, for estimating the restocking ability of exploited regional subpopulations. As a case study, we tested the utility of environmental niche modeling to investigate the potential global distribution of a highly mobile temperate marine coastal species, the broadnose sevengill shark (Notorynchus cepedianus). First, we characterized and compared three model variants using global data and regional data from two geographically distant and genetically diverging subpopulations in the Southwest Atlantic and southern Australia. The best performing model was then transferred to the rest of the world to obtain a final global prediction for the species. Predictions revealed broad suitable areas across temperate regions of the Northern and Southern Hemispheres. As a final step, we overlaid underwater seamount data on suitability maps to simulate possible dispersal corridors and regional connectivity. Global subpopulation connectivity and dispersal are discussed in the light of recent genetic evidence, to help explain why unoccupied suitable areas are not currently accessed by the species. This study highlights the potential use of global and regional data for the assessment of habitat suitability of species at a global scale, and provides considerations when applying these models to other highly mobile species.

show abstract

Section: Discussionsupporting

confidence: 89%