Natural or artificial? Habitat-use by the bull shark, Carcharhinus leucas.

<h4>Background</h4>Despite accelerated global population declines due to targeted and illegal fishing pressure for many top-level shark species, the impacts of coastal habitat modification have been largely overlooked. We present the first direct comparison of the use of natural versus a...

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Autores principales:	Jonathan M Werry, Shing Y Lee, Charles J Lemckert, Nicholas M Otway
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c3a4702e9ba14304b2f2d114b4ba9c9a
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spelling	oai:doaj.org-article:c3a4702e9ba14304b2f2d114b4ba9c9a2021-11-18T08:08:26ZNatural or artificial? Habitat-use by the bull shark, Carcharhinus leucas.1932-620310.1371/journal.pone.0049796https://doaj.org/article/c3a4702e9ba14304b2f2d114b4ba9c9a2012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23166772/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Despite accelerated global population declines due to targeted and illegal fishing pressure for many top-level shark species, the impacts of coastal habitat modification have been largely overlooked. We present the first direct comparison of the use of natural versus artificial habitats for the bull shark, Carcharhinus leucas, an IUCN 'Near-threatened' species--one of the few truly euryhaline sharks that utilises natural rivers and estuaries as nursery grounds before migrating offshore as adults. Understanding the value of alternate artificial coastal habitats to the lifecycle of the bull shark is crucial for determining the impact of coastal development on this threatened but potentially dangerous species.<h4>Methodology/findings</h4>We used longline surveys and long-term passive acoustic tracking of neonate and juvenile bull sharks to determine the ontogenetic value of natural and artificial habitats to bull sharks associated with the Nerang River and adjoining canals on the Gold Coast, Australia. Long-term movements of tagged sharks suggested a preference for the natural river over artificial habitat (canals). Neonates and juveniles spent the majority of their time in the upper tidal reaches of the Nerang River and undertook excursions into adjoining canals. Larger bull sharks ranged further and frequented the canals closer to the river mouth.<h4>Conclusions/significance</h4>Our work suggests with increased destruction of natural habitats, artificial coastal habitat may become increasingly important to large juvenile bull sharks with associated risk of attack on humans. In this system, neonate and juvenile bull sharks utilised the natural and artificial habitats, but the latter was not the preferred habitat of neonates. The upper reaches of tidal rivers, often under significant modification pressure, serve as nursery sites for neonates. Analogous studies are needed in similar systems elsewhere to assess the spatial and temporal generality of this research.Jonathan M WerryShing Y LeeCharles J LemckertNicholas M OtwayPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 11, p e49796 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jonathan M Werry Shing Y Lee Charles J Lemckert Nicholas M Otway Natural or artificial? Habitat-use by the bull shark, Carcharhinus leucas.
description	<h4>Background</h4>Despite accelerated global population declines due to targeted and illegal fishing pressure for many top-level shark species, the impacts of coastal habitat modification have been largely overlooked. We present the first direct comparison of the use of natural versus artificial habitats for the bull shark, Carcharhinus leucas, an IUCN 'Near-threatened' species--one of the few truly euryhaline sharks that utilises natural rivers and estuaries as nursery grounds before migrating offshore as adults. Understanding the value of alternate artificial coastal habitats to the lifecycle of the bull shark is crucial for determining the impact of coastal development on this threatened but potentially dangerous species.<h4>Methodology/findings</h4>We used longline surveys and long-term passive acoustic tracking of neonate and juvenile bull sharks to determine the ontogenetic value of natural and artificial habitats to bull sharks associated with the Nerang River and adjoining canals on the Gold Coast, Australia. Long-term movements of tagged sharks suggested a preference for the natural river over artificial habitat (canals). Neonates and juveniles spent the majority of their time in the upper tidal reaches of the Nerang River and undertook excursions into adjoining canals. Larger bull sharks ranged further and frequented the canals closer to the river mouth.<h4>Conclusions/significance</h4>Our work suggests with increased destruction of natural habitats, artificial coastal habitat may become increasingly important to large juvenile bull sharks with associated risk of attack on humans. In this system, neonate and juvenile bull sharks utilised the natural and artificial habitats, but the latter was not the preferred habitat of neonates. The upper reaches of tidal rivers, often under significant modification pressure, serve as nursery sites for neonates. Analogous studies are needed in similar systems elsewhere to assess the spatial and temporal generality of this research.
format	article
author	Jonathan M Werry Shing Y Lee Charles J Lemckert Nicholas M Otway
author_facet	Jonathan M Werry Shing Y Lee Charles J Lemckert Nicholas M Otway
author_sort	Jonathan M Werry
title	Natural or artificial? Habitat-use by the bull shark, Carcharhinus leucas.
title_short	Natural or artificial? Habitat-use by the bull shark, Carcharhinus leucas.
title_full	Natural or artificial? Habitat-use by the bull shark, Carcharhinus leucas.
title_fullStr	Natural or artificial? Habitat-use by the bull shark, Carcharhinus leucas.
title_full_unstemmed	Natural or artificial? Habitat-use by the bull shark, Carcharhinus leucas.
title_sort	natural or artificial? habitat-use by the bull shark, carcharhinus leucas.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/c3a4702e9ba14304b2f2d114b4ba9c9a
work_keys_str_mv	AT jonathanmwerry naturalorartificialhabitatusebythebullsharkcarcharhinusleucas AT shingylee naturalorartificialhabitatusebythebullsharkcarcharhinusleucas AT charlesjlemckert naturalorartificialhabitatusebythebullsharkcarcharhinusleucas AT nicholasmotway naturalorartificialhabitatusebythebullsharkcarcharhinusleucas
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Natural or artificial? Habitat-use by the bull shark, Carcharhinus leucas.

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