Antarctic Toothfish <i>Dissostichus mawsoni</i> in the South Orkney Islands: Using Otolith Chemistry to Test Current Hypotheses About Nursery Areas and Demographic Units
We used otolith chemistry to test and complement current hypotheses regarding habitat use and connectivity between <i>Dissostichus mawsoni</i> sub-populations in Area 48 of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR). Sagittal otoliths from 45 fish s...
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2024-12-01
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| author | Paulina Carimán Edwin J. Niklitschek Cristóbal Garcés Mathieu Leisen Fernando Barra Rurik Romero |
| author_facet | Paulina Carimán Edwin J. Niklitschek Cristóbal Garcés Mathieu Leisen Fernando Barra Rurik Romero |
| author_sort | Paulina Carimán |
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| description | We used otolith chemistry to test and complement current hypotheses regarding habitat use and connectivity between <i>Dissostichus mawsoni</i> sub-populations in Area 48 of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR). Sagittal otoliths from 45 fish sampled near the South Orkney Islands were analysed. Their elemental (Li, Na, Mg, Cr, Mn, Sr, Sn, and Ba relative to Ca) and isotopic (δ<sup>18</sup>O and δ<sup>13</sup>C) signatures were examined in both the nuclear and marginal regions, representing juvenile and adult stages. Potential nursery habitats were geo-located by comparing observed and expected δ<sup>18</sup>O values. Chemical differences between the nuclear and marginal regions indicated ontogenetic migrations to deeper offshore habitats, suggesting a distinct habitat shift between 11 and 13 years of life. The data supported the existence of two nursery origins contributing to the study area’s population. However, the exact locations of these origins remain unclear and did not provide direct support for the hypotheses currently under consideration by the CCAMLR. Therefore, further assessment of the connectivity between nursery and adult habitats, as well as spawning site fidelity, is necessary before ruling out alternative hypotheses. |
| format | Article |
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| institution | Kabale University |
| issn | 2079-7737 |
| language | English |
| publishDate | 2024-12-01 |
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| spelling | doaj-art-1c78d62638694cd49f3f4b41bed34f692025-01-24T13:23:17ZengMDPI AGBiology2079-77372024-12-01141710.3390/biology14010007Antarctic Toothfish <i>Dissostichus mawsoni</i> in the South Orkney Islands: Using Otolith Chemistry to Test Current Hypotheses About Nursery Areas and Demographic UnitsPaulina Carimán0Edwin J. Niklitschek1Cristóbal Garcés2Mathieu Leisen3Fernando Barra4Rurik Romero5Institute of Environmental and Evolutionary Sciences, Faculty of Sciences, Austral University of Chile, Valdivia 5091000, Chilei~mar Centre, University of Los Lagos, Puerto Montt 5480000, ChileDoctoral Program in Ecology and Evolution, Faculty of Sciences, Austral University of Chile, Valdivia 5091000, ChileGeosciences-Environment Toulouse, University of Toulouse, 31400 Toulouse, FranceAndean Geothermal Center of Excellence, University of Chile, Santiago 8370446, ChileAndean Geothermal Center of Excellence, University of Chile, Santiago 8370446, ChileWe used otolith chemistry to test and complement current hypotheses regarding habitat use and connectivity between <i>Dissostichus mawsoni</i> sub-populations in Area 48 of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR). Sagittal otoliths from 45 fish sampled near the South Orkney Islands were analysed. Their elemental (Li, Na, Mg, Cr, Mn, Sr, Sn, and Ba relative to Ca) and isotopic (δ<sup>18</sup>O and δ<sup>13</sup>C) signatures were examined in both the nuclear and marginal regions, representing juvenile and adult stages. Potential nursery habitats were geo-located by comparing observed and expected δ<sup>18</sup>O values. Chemical differences between the nuclear and marginal regions indicated ontogenetic migrations to deeper offshore habitats, suggesting a distinct habitat shift between 11 and 13 years of life. The data supported the existence of two nursery origins contributing to the study area’s population. However, the exact locations of these origins remain unclear and did not provide direct support for the hypotheses currently under consideration by the CCAMLR. Therefore, further assessment of the connectivity between nursery and adult habitats, as well as spawning site fidelity, is necessary before ruling out alternative hypotheses.https://www.mdpi.com/2079-7737/14/1/7Antarctic toothfishnursery areasdemographic unitsotolith chemistrystock identificationstable isotopes |
| spellingShingle | Paulina Carimán Edwin J. Niklitschek Cristóbal Garcés Mathieu Leisen Fernando Barra Rurik Romero Antarctic Toothfish <i>Dissostichus mawsoni</i> in the South Orkney Islands: Using Otolith Chemistry to Test Current Hypotheses About Nursery Areas and Demographic Units Biology Antarctic toothfish nursery areas demographic units otolith chemistry stock identification stable isotopes |
| title | Antarctic Toothfish <i>Dissostichus mawsoni</i> in the South Orkney Islands: Using Otolith Chemistry to Test Current Hypotheses About Nursery Areas and Demographic Units |
| title_full | Antarctic Toothfish <i>Dissostichus mawsoni</i> in the South Orkney Islands: Using Otolith Chemistry to Test Current Hypotheses About Nursery Areas and Demographic Units |
| title_fullStr | Antarctic Toothfish <i>Dissostichus mawsoni</i> in the South Orkney Islands: Using Otolith Chemistry to Test Current Hypotheses About Nursery Areas and Demographic Units |
| title_full_unstemmed | Antarctic Toothfish <i>Dissostichus mawsoni</i> in the South Orkney Islands: Using Otolith Chemistry to Test Current Hypotheses About Nursery Areas and Demographic Units |
| title_short | Antarctic Toothfish <i>Dissostichus mawsoni</i> in the South Orkney Islands: Using Otolith Chemistry to Test Current Hypotheses About Nursery Areas and Demographic Units |
| title_sort | antarctic toothfish i dissostichus mawsoni i in the south orkney islands using otolith chemistry to test current hypotheses about nursery areas and demographic units |
| topic | Antarctic toothfish nursery areas demographic units otolith chemistry stock identification stable isotopes |
| url | https://www.mdpi.com/2079-7737/14/1/7 |
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