Satellite Tagging and Photographic Identification Reveal Connectivity Between Two UNESCO World Heritage Areas for Reef Manta Rays

Frontiers in Marine Science

Anthony J. Richardson²  Jessica Smith⁴  Frazer McGregor⁵  Amelia J. Armstrong⁶  Kathy A. Townsend⁶  Mike van Keulen⁶  Asia O. Armstrong⁶  Michael B. Bennett⁷  Christine L. Dudgeon⁷  Graeme C. Hays⁹ 

[1] Atmosphere, Queensland Biosciences Precinct, Brisbane, QLD, Australia;;CSIRO Oceans &Centre for Applied Resource Mathematics, The University of Queensland, Brisbane, WA, Australia;Environmental and Conservation Sciences, Murdoch University, Melville, WA, Australia;Murdoch University Coral Bay Field Station, Coral Bay, WA, Australia;Project Manta, The University of Queensland, Brisbane, QLD, Australia;School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia;School of Life and Environmental Sciences, Deakin University, Geelong, VIC, Australia;School of Science and Engineering, University of the Sunshine Coast, Fraser Coast Campus, Hervey Bay, QLD, Australia;

关键词: site affinity;    Mobula alfredi;    Ningaloo Reef;    satellite telemetry;    citizen science;   

DOI  :  10.3389/fmars.2020.00725

来源: DOAJ

【 摘 要 】

Reef manta rays (Mobula alfredi) are capable of long-distance dispersal when habitat is continuous. In the Ningaloo Reef World Heritage Area located on Australia’s mid-west coast, M. alfredi is sighted year-round and is a focal species for ecotourism in the region. Despite value to local tourism and demographic vulnerability to exploitation, basic information regarding M. alfredi movements and area use in this region is lacking. Here we used satellite tags and a long-term photographic-identification database collected by researchers and citizen scientists to examine the species’ visitation patterns and regional space use. Tagged M. alfredi remained in coastal shelf waters, preferentially occupying shallow depths < 20 m (76% of depth observations). Comparison of real tracks against those produced by correlated random walk simulations revealed directional dispersal and connectivity between the Ningaloo and Shark Bay World Heritage Areas. The greatest linear distance an individual moved after tagging was ∼700 km. This movement range is comparable to seasonal M. alfredi migration observed at similar latitudes on Australia’s east coast. Photographic-identification of 1121 individual M. alfredi, from 5146 sighting events, revealed that some individuals exhibited long-term site affinity to locations within Ningaloo Marine Park, with the longest spanning 15.16 years (9.8% individuals > 10 years). Lagged Identification Rate analysis suggested site visitation was best described by a pattern of emigration and reimmigration. While our observations of movement and residency establishes basic information previously unknown for the species in this region, the overlap of core area use with existing UNESCO World Heritage Areas demonstrates the potential for well-positioned marine parks to provide protection of critical habitat for M. alfredi.

【 授权许可】

Unknown