Residency patterns and migration dynamics of adult bull sharks (Carcharhinus leucas) on the east coast of southern Africa.

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 ac...

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Autores principales:	Ryan Daly, Malcolm J Smale, Paul D Cowley, Pierre W Froneman
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e9dde6bfbd5e40f486c0f1c2d6fd39c7
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spelling	oai:doaj.org-article:e9dde6bfbd5e40f486c0f1c2d6fd39c72021-11-25T05:57:30ZResidency patterns and migration dynamics of adult bull sharks (Carcharhinus leucas) on the east coast of southern Africa.1932-620310.1371/journal.pone.0109357https://doaj.org/article/e9dde6bfbd5e40f486c0f1c2d6fd39c72014-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0109357https://doaj.org/toc/1932-6203Bull 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 x d(-1) (mean = 17.58 km x 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.Ryan DalyMalcolm J SmalePaul D CowleyPierre W FronemanPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 10, p e109357 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ryan Daly Malcolm J Smale Paul D Cowley Pierre W Froneman Residency patterns and migration dynamics of adult bull sharks (Carcharhinus leucas) on the east coast of southern Africa.
description	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 x d(-1) (mean = 17.58 km x 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.
format	article
author	Ryan Daly Malcolm J Smale Paul D Cowley Pierre W Froneman
author_facet	Ryan Daly Malcolm J Smale Paul D Cowley Pierre W Froneman
author_sort	Ryan Daly
title	Residency patterns and migration dynamics of adult bull sharks (Carcharhinus leucas) on the east coast of southern Africa.
title_short	Residency patterns and migration dynamics of adult bull sharks (Carcharhinus leucas) on the east coast of southern Africa.
title_full	Residency patterns and migration dynamics of adult bull sharks (Carcharhinus leucas) on the east coast of southern Africa.
title_fullStr	Residency patterns and migration dynamics of adult bull sharks (Carcharhinus leucas) on the east coast of southern Africa.
title_full_unstemmed	Residency patterns and migration dynamics of adult bull sharks (Carcharhinus leucas) on the east coast of southern Africa.
title_sort	residency patterns and migration dynamics of adult bull sharks (carcharhinus leucas) on the east coast of southern africa.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/e9dde6bfbd5e40f486c0f1c2d6fd39c7
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Residency patterns and migration dynamics of adult bull sharks (Carcharhinus leucas) on the east coast of southern Africa.

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