Marine hotspots of activity inform protection of a threatened community of pelagic species in a large oceanic jurisdiction

Animal Conservation - Tập 23 Số 5 - Trang 585-596 - 2020
Susana Requena1, Steffen Oppel1, Alexander L. Bond2,1, Jonathan Hall1, Jaimie Cleeland1, Robert J. M. Crawford3, Delia Davies4, Ben J. Dilley4, Trevor Glass5, Azwianewi B. Makhado3,4, Norman Ratcliffe6, Tim Reid4, Robert A. Ronconi7,8, Andy Schofield1, Antje Steinfurth1, Mia Wege9, Marthán N Bester9, Peter G. Ryan4
1RSPB Centre for Conservation Science, Royal Society for the Protection of Birds, Sandy, UK
2Bird Group, Department of Life Sciences, The National History Museum, Tring, UK
3Department of Environmental Affairs, Branch Oceans and Coasts, Cape Town, South Africa
4FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, Rondebosch, South Africa
5Tristan da Cunha Conservation Department, Edinburgh of the Seven Seas, Tristan da Cunha
6British Antarctic Survey, Cambridge, UK
7Canadian Wildlife Service, Environment and Climate Change Canada, Dartmouth, Nova Scotia, Canada
8Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada
9Department of Zoology and Entomology, Mammal Research Institute, University of Pretoria, Pretoria, South Africa

Tóm tắt

AbstractRemote oceanic islands harbour unique biodiversity, especially of species that rely on the marine trophic resources around their breeding islands. Identifying marine areas used by such species is essential to manage and limit processes that threaten these species. The Tristan da Cunha territory in the South Atlantic Ocean hosts several endemic and globally threatened seabirds, and pinnipeds; how they use the waters surrounding the islands must be considered when planning commercial activities. To inform marine management in the Tristan da Cunha Exclusive Economic Zone (EEZ), we identified statistically significant areas of concentrated activity by collating animal tracking data from nine seabirds and one marine mammal. We first calculated the time that breeding adults of the tracked species spent in 10 × 10 km cells within the EEZ, for each of four seasons to account for temporal variability in space use. By applying a spatial aggregation statistic over these grids for each season, we detected areas that are used more than expected by chance. Most of the activity hotspots were either within 100 km of breeding colonies or were associated with seamounts, being spatially constant across several seasons. Our simple and effective approach highlights important areas for pelagic biodiversity that will benefit conservation planning and marine management strategies.

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Animal Conservation

Tập 23 Số 5

585-596

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