TY - JOUR
T1 - Genome-wide analysis reveals striking lack of genetic differentiation over long distances for the Antarctic toothfish Dissostichus mawsoni
T2 - High genetic connectivity or shared spawning grounds?
AU - Ceballos, Santiago G.
AU - Papetti, Chiara
AU - Babbucci, Massimiliano
AU - Fernández, Daniel A.
AU - Schiavon, Luca
AU - Cheng, C. H.Christina
N1 - Funding Information:
This work was facilitated by the fellowship granted by CONICET to SGC for a research stay at C-HCC lab at the UIUC. We thank ESTREMAR SAU for contribution of equipment, reagents and services necessary for RAD library preparations and sequencing. C-HCC thanks her Antarctic field team especially Arthur DeVries in the collection of Antarctic toothfish, and additionally to the marine technical crew onboard of the R/V Laurence M. Gould. C-HCC acknowledges research funding support (grants O PP-0231006, ANT-1142158) from the US National Science Foundation Office of Polar Programs . The authors would like to thank Magnus Lucassen, Nils Koschnick, Stephan Hain (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, AWI, Bremerhaven, Germany) and the ship crew for their help in collecting samples onboard the R/V Polarstern. The authors are deeply grateful to Henrik Christiansen (Laboratory of Biodiversity and Evolutionary Genomics, KU Leuven, Leuven, Belgium) for providing precious samples from the Ross Sea. The authors are grateful to Mario La Mesa who shared thoughts about the implications of our results and gave valuable feedback on the manuscript. The authors are grateful to Emilio Riginella (Anton Dohrn Zoological Station, Napoli, Italy) for the insightful comments during data analysis. We also thank Rafaella Franch, Alessandra Battistotti, Giuditta Codogno and Ilaria Anna Maria Marino for their help with the lab work. This research was partially supported by The M ohamed bin Zayed Species Conservation Fund , project no.182519694 to CP.
Funding Information:
This work was facilitated by the fellowship granted by CONICET to SGC for a research stay at C-HCC lab at the UIUC. We thank ESTREMAR SAU for contribution of equipment, reagents and services necessary for RAD library preparations and sequencing. C-HCC thanks her Antarctic field team especially Arthur DeVries in the collection of Antarctic toothfish, and additionally to the marine technical crew onboard of the R/V Laurence M. Gould. C-HCC acknowledges research funding support (grants OPP-0231006, ANT-1142158) from the US National Science Foundation Office of Polar Programs. The authors would like to thank Magnus Lucassen, Nils Koschnick, Stephan Hain (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, AWI, Bremerhaven, Germany) and the ship crew for their help in collecting samples onboard the R/V Polarstern. The authors are deeply grateful to Henrik Christiansen (Laboratory of Biodiversity and Evolutionary Genomics, KU Leuven, Leuven, Belgium) for providing precious samples from the Ross Sea. The authors are grateful to Mario La Mesa who shared thoughts about the implications of our results and gave valuable feedback on the manuscript. The authors are grateful to Emilio Riginella (Anton Dohrn Zoological Station, Napoli, Italy) for the insightful comments during data analysis. We also thank Rafaella Franch, Alessandra Battistotti, Giuditta Codogno and Ilaria Anna Maria Marino for their help with the lab work. This research was partially supported by The Mohamed bin Zayed Species Conservation Fund, project no.182519694 to CP.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/11
Y1 - 2021/11
N2 - The giant Antarctic toothfish Dissostichus mawsoni is one of the most economically valued fishery resources from the Southern Ocean. However, the distinctive biological characteristics and life history of this species, including large body size, long life span, late sexual maturity, and specialization to freezing polar waters, make it particularly vulnerable to overfishing and global climate change. It is therefore of fundamental importance to administer sound management and conservation actions to avoid depletion of this unique species. The crucial issue of whether this species consists of distinct biological units or stocks, which is needed to inform appropriate management and conservation, is currently unresolved. We report here the first RAD-seq analysis of Antarctic toothfish populations, a powerful approach of genome-wide discovery of SNP loci, to assess genetic differentiation between the geographically distant individuals from CCAMLAR Subarea 48.1 locations (South Shetland Islands and West Antarctic Peninsula coasts) and Subarea 88.1 (Ross Sea and McMurdo Sound). We recovered 19,611 SNPs belonging to 13,251 widely shared loci. Comprehensive population structure analyses unambiguously indicated absence of any significant level of population differentiation, thus the null hypothesis of panmixia cannot be rejected. Together with currently known life history traits of D. mawsoni, we suggest this striking lack of genomic differentiation likely reflects high degrees of contemporary and/or historical gene flow rather than shared spawning grounds. Complementary analyses, particularly otolith microchemistry, would contribute useful inference of natal origins.
AB - The giant Antarctic toothfish Dissostichus mawsoni is one of the most economically valued fishery resources from the Southern Ocean. However, the distinctive biological characteristics and life history of this species, including large body size, long life span, late sexual maturity, and specialization to freezing polar waters, make it particularly vulnerable to overfishing and global climate change. It is therefore of fundamental importance to administer sound management and conservation actions to avoid depletion of this unique species. The crucial issue of whether this species consists of distinct biological units or stocks, which is needed to inform appropriate management and conservation, is currently unresolved. We report here the first RAD-seq analysis of Antarctic toothfish populations, a powerful approach of genome-wide discovery of SNP loci, to assess genetic differentiation between the geographically distant individuals from CCAMLAR Subarea 48.1 locations (South Shetland Islands and West Antarctic Peninsula coasts) and Subarea 88.1 (Ross Sea and McMurdo Sound). We recovered 19,611 SNPs belonging to 13,251 widely shared loci. Comprehensive population structure analyses unambiguously indicated absence of any significant level of population differentiation, thus the null hypothesis of panmixia cannot be rejected. Together with currently known life history traits of D. mawsoni, we suggest this striking lack of genomic differentiation likely reflects high degrees of contemporary and/or historical gene flow rather than shared spawning grounds. Complementary analyses, particularly otolith microchemistry, would contribute useful inference of natal origins.
KW - Dissostichus mawsoni
KW - Population genomics
KW - RAD-seq
KW - Stock structure
UR - http://www.scopus.com/inward/record.url?scp=85111331022&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85111331022&partnerID=8YFLogxK
U2 - 10.1016/j.fishres.2021.106074
DO - 10.1016/j.fishres.2021.106074
M3 - Article
AN - SCOPUS:85111331022
SN - 0165-7836
VL - 243
JO - Fisheries Research
JF - Fisheries Research
M1 - 106074
ER -