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Climatic change drives dynamic source-sink relationships in marine species with high dispersal potential

Citation

Silva, CNS and Young, EF and Murphy, NP and Bell, JJ and Green, BS and Morley, SA and Duhamel, G and Cockcroft, AC and Strugnell, JM, Climatic change drives dynamic source-sink relationships in marine species with high dispersal potential, Ecology and Evolution, 11, (6) pp. 2535-2550. ISSN 2045-7758 (2021) [Refereed Article]


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DOI: doi:10.1002/ece3.7204

Abstract

While there is now strong evidence that many factors can shape dispersal, the mechanisms influencing connectivity patterns are species-specific and remain largely unknown for many species with a high dispersal potential. The rock lobsters Jasus tristani and Jasus paulensis have a long pelagic larval duration (up to 20 months) and inhabit seamounts and islands in the southern Atlantic and Indian Oceans, respectively. We used a multidisciplinary approach to assess the genetic relationships between J. tristani and J. paulensis, investigate historic and contemporary gene flow, and inform fisheries management. Using 17,256 neutral single nucleotide polymorphisms we found low but significant genetic differentiation. We show that patterns of connectivity changed over time in accordance with climatic fluctuations. Historic migration estimates showed stronger connectivity from the Indian to the Atlantic Ocean (influenced by the Agulhas Leakage). In contrast, the individual-based model coupled with contemporary migration estimates inferred from genetic data showed stronger inter-ocean connectivity in the opposite direction from the Atlantic to the Indian Ocean driven by the Subtropical Front. We suggest that the J. tristani and J. paulensis historical distribution might have extended further north (when water temperatures were lower) resulting in larval dispersal between the ocean basis being more influenced by the Agulhas Leakage than the Subtropical Front. As water temperatures in the region increase in accordance with anthropogenic climate change, a southern shift in the distribution range of J. tristani and J. paulensis could further reduce larval transport from the Indian to the Atlantic Ocean, adding complexity to fisheries management.

Item Details

Item Type:Refereed Article
Keywords:connectivity, individual-based model, Jasus paulensis, Jasus tristani, lobster, population genetics
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Population ecology
Objective Division:Animal Production and Animal Primary Products
Objective Group:Other animal production and animal primary products
Objective Field:Animal adaptation to climate change
UTAS Author:Green, BS (Associate Professor Bridget Green)
ID Code:150544
Year Published:2021
Web of Science® Times Cited:3
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2022-06-20
Last Modified:2022-06-20
Downloads:0

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