globalchange  > 过去全球变化的重建
DOI: 10.1371/journal.pone.0109357
论文题名:
Residency Patterns and Migration Dynamics of Adult Bull Sharks (Carcharhinus leucas) on the East Coast of Southern Africa
作者: Ryan Daly; Malcolm J. Smale; Paul D. Cowley; Pierre W. Froneman
刊名: PLOS ONE
ISSN: 1932-6203
出版年: 2014
发表日期: 2014-10-8
卷: 9, 期:10
语种: 英语
英文关键词: Sharks ; Animal migration ; Reefs ; Coral reefs ; Habitats ; Acoustics ; Conservation science ; Foraging
英文摘要: Bull sharks (Carcharhinus leucas) are globally distributed top predators that play an important ecological role within coastal marine communities. However, little is known about the spatial and temporal scales of their habitat use and associated ecological role. In this study, we employed passive acoustic telemetry to investigate the residency patterns and migration dynamics of 18 adult bull sharks (195–283 cm total length) tagged in southern Mozambique for a period of between 10 and 22 months. The majority of sharks (n = 16) exhibited temporally and spatially variable residency patterns interspersed with migration events. Ten individuals undertook coastal migrations that ranged between 433 and 709 km (mean = 533 km) with eight of these sharks returning to the study site. During migration, individuals exhibited rates of movement between 2 and 59 km.d−1 (mean = 17.58 km.d−1) and were recorded travelling annual distances of between 450 and 3760 km (mean = 1163 km). Migration towards lower latitudes primarily took place in austral spring and winter and there was a significant negative correlation between residency and mean monthly sea temperature at the study site. This suggested that seasonal change is the primary driver behind migration events but further investigation is required to assess how foraging and reproductive activity may influence residency patterns and migration. Results from this study highlight the need for further understanding of bull shark migration dynamics and suggest that effective conservation strategies for this vulnerable species necessitate the incorporation of congruent trans-boundary policies over large spatial scales.
URL: http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0109357&type=printable
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/18295
Appears in Collections:过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响

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作者单位: Department of Zoology & Entomology, Rhodes University, Grahamstown, South Africa;Port Elizabeth Museum at Bayworld, Humewood, Port Elizabeth, South Africa;Port Elizabeth Museum at Bayworld, Humewood, Port Elizabeth, South Africa;Department of Zoology, Nelson Mandela Metropolitan University, Port Elizabeth, South Africa;South African Institute for Aquatic Biodiversity (SAIAB), Grahamstown, South Africa;Department of Zoology & Entomology, Rhodes University, Grahamstown, South Africa

Recommended Citation:
Ryan Daly,Malcolm J. Smale,Paul D. Cowley,et al. Residency Patterns and Migration Dynamics of Adult Bull Sharks (Carcharhinus leucas) on the East Coast of Southern Africa[J]. PLOS ONE,2014-01-01,9(10)
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