Journal
FRONTIERS IN ECOLOGY AND EVOLUTION
Volume 6, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fevo.2018.00187
Keywords
telemetry; tracking; population structure; mitochondrial DNA; microsatellites; conservation; fisheries
Categories
Funding
- Fisheries Research and Development Corporation Tactical Research Fund, Australian Government [2011-077]
- SeaWorld Research and Rescue Foundation
- Nature Foundation SA Inc.
- Australian Geographic Society
- SARDI Aquatic Sciences
- Victorian Department of Primary Industries Recreational Fishing License Trust Account Large Grants Program
- Australian Research Council [FT130101068]
- Isabel Barreto Human Resources Plan of the Government of Galicia
- Department for Environment and Water (DEW)
- Flinders University
- Flinders University Animal Welfare Committee [309]
- FRDC
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In this paper we combine analyses of satellite telemetry and molecular data to investigate spatial connectivity and genetic structure among populations of shortfin mako (Isurus oxyrinchus) in and around Australian waters, where this species is taken in recreational and commercial fisheries. Mitochondrial DNA data suggest matrilineal substructure across hemispheres, while nuclear DNA data indicate shortfin mako may constitute a globally panmictic population. There was generally high genetic connectivity within Australian waters. Assessing genetic connectivity across the Indian Ocean basin, as well as the extent that shortfin mako exhibit sex biases in dispersal patterns would benefit from future improved sampling of adult size classes, particularly of individuals from the eastern Indian Ocean. Telemetry data indicated that Australasian mako are indeed highly migratory and frequently make long-distance movements. However, individuals also exhibit fidelity to relatively small geographic areas for extended periods. Together these patterns suggest that shortfin mako populations may be genetically homogenous across large geographical areas as a consequence of few reproductively active migrants, although spatial partitioning exists. Given that connectivity appears to occur at different scales, management at both the national and regional levels seems most appropriate.
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