Effects of vessel traffic and underwater noise on the movement, behaviour and vocalisations of bottlenose dolphins in an urbanised estuary

Abstarct The potential disturbance of dolphins from tourism boats has been widely discussed in the literature, in terms of both physical vessel presence and associated underwater noise. However, less attention has been paid to the potential impact of non-tourism vessels, despite these being much mor...

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Autores principales:	Sarah A. Marley, Chandra P. Salgado Kent, Christine Erbe, Iain M. Parnum
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/cf53b48c1e224323b52c30bc849e96bd
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spelling	oai:doaj.org-article:cf53b48c1e224323b52c30bc849e96bd2021-12-02T15:04:54ZEffects of vessel traffic and underwater noise on the movement, behaviour and vocalisations of bottlenose dolphins in an urbanised estuary10.1038/s41598-017-13252-z2045-2322https://doaj.org/article/cf53b48c1e224323b52c30bc849e96bd2017-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-13252-zhttps://doaj.org/toc/2045-2322Abstarct The potential disturbance of dolphins from tourism boats has been widely discussed in the literature, in terms of both physical vessel presence and associated underwater noise. However, less attention has been paid to the potential impact of non-tourism vessels, despite these being much more widespread and occurring in greater numbers throughout coastal dolphin habitats. The Indo-Pacific bottlenose dolphin (T. aduncus) community using the Fremantle Inner Harbour, Western Australia, is exposed to high levels of vessel traffic. To investigate whether behavioural responses could be occurring, a non-invasive combination of visual and acoustic monitoring was conducted using a theodolite and an autonomous acoustic logger. Dolphins significantly increased their average movement speeds in high vessel densities, but only for some activity states. Behavioural budgets also changed in the presence of vessels, with animals spending greater time travelling and less time resting or socialising. Finally, multiple whistle characteristics varied with rising levels of broadband noise, and other contextual variables. Despite being acoustically specialised for higher frequencies, dolphins had the strongest acoustic variation during low-frequency noise. This study highlights the complexity of disturbance responses in this species, confirming the need for consideration of both surface and acoustic behaviour alongside appropriate contextual data.Sarah A. MarleyChandra P. Salgado KentChristine ErbeIain M. ParnumNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-14 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sarah A. Marley Chandra P. Salgado Kent Christine Erbe Iain M. Parnum Effects of vessel traffic and underwater noise on the movement, behaviour and vocalisations of bottlenose dolphins in an urbanised estuary
description	Abstarct The potential disturbance of dolphins from tourism boats has been widely discussed in the literature, in terms of both physical vessel presence and associated underwater noise. However, less attention has been paid to the potential impact of non-tourism vessels, despite these being much more widespread and occurring in greater numbers throughout coastal dolphin habitats. The Indo-Pacific bottlenose dolphin (T. aduncus) community using the Fremantle Inner Harbour, Western Australia, is exposed to high levels of vessel traffic. To investigate whether behavioural responses could be occurring, a non-invasive combination of visual and acoustic monitoring was conducted using a theodolite and an autonomous acoustic logger. Dolphins significantly increased their average movement speeds in high vessel densities, but only for some activity states. Behavioural budgets also changed in the presence of vessels, with animals spending greater time travelling and less time resting or socialising. Finally, multiple whistle characteristics varied with rising levels of broadband noise, and other contextual variables. Despite being acoustically specialised for higher frequencies, dolphins had the strongest acoustic variation during low-frequency noise. This study highlights the complexity of disturbance responses in this species, confirming the need for consideration of both surface and acoustic behaviour alongside appropriate contextual data.
format	article
author	Sarah A. Marley Chandra P. Salgado Kent Christine Erbe Iain M. Parnum
author_facet	Sarah A. Marley Chandra P. Salgado Kent Christine Erbe Iain M. Parnum
author_sort	Sarah A. Marley
title	Effects of vessel traffic and underwater noise on the movement, behaviour and vocalisations of bottlenose dolphins in an urbanised estuary
title_short	Effects of vessel traffic and underwater noise on the movement, behaviour and vocalisations of bottlenose dolphins in an urbanised estuary
title_full	Effects of vessel traffic and underwater noise on the movement, behaviour and vocalisations of bottlenose dolphins in an urbanised estuary
title_fullStr	Effects of vessel traffic and underwater noise on the movement, behaviour and vocalisations of bottlenose dolphins in an urbanised estuary
title_full_unstemmed	Effects of vessel traffic and underwater noise on the movement, behaviour and vocalisations of bottlenose dolphins in an urbanised estuary
title_sort	effects of vessel traffic and underwater noise on the movement, behaviour and vocalisations of bottlenose dolphins in an urbanised estuary
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/cf53b48c1e224323b52c30bc849e96bd
work_keys_str_mv	AT sarahamarley effectsofvesseltrafficandunderwaternoiseonthemovementbehaviourandvocalisationsofbottlenosedolphinsinanurbanisedestuary AT chandrapsalgadokent effectsofvesseltrafficandunderwaternoiseonthemovementbehaviourandvocalisationsofbottlenosedolphinsinanurbanisedestuary AT christineerbe effectsofvesseltrafficandunderwaternoiseonthemovementbehaviourandvocalisationsofbottlenosedolphinsinanurbanisedestuary AT iainmparnum effectsofvesseltrafficandunderwaternoiseonthemovementbehaviourandvocalisationsofbottlenosedolphinsinanurbanisedestuary
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Effects of vessel traffic and underwater noise on the movement, behaviour and vocalisations of bottlenose dolphins in an urbanised estuary

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