Seismic surveys negatively affect humpback whale singing activity off northern Angola.

Passive acoustic monitoring was used to document the presence of singing humpback whales off the coast of Northern Angola, and opportunistically test for the effect of seismic survey activity in the vicinity on the number of singing whales. Two Marine Autonomous Recording Units (MARUs) were deployed...

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Autores principales:	Salvatore Cerchio, Samantha Strindberg, Tim Collins, Chanda Bennett, Howard Rosenbaum
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a37a414e51b94d6d800bebb909b44b21
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spelling	oai:doaj.org-article:a37a414e51b94d6d800bebb909b44b212021-11-18T08:28:41ZSeismic surveys negatively affect humpback whale singing activity off northern Angola.1932-620310.1371/journal.pone.0086464https://doaj.org/article/a37a414e51b94d6d800bebb909b44b212014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24618836/?tool=EBIhttps://doaj.org/toc/1932-6203Passive acoustic monitoring was used to document the presence of singing humpback whales off the coast of Northern Angola, and opportunistically test for the effect of seismic survey activity in the vicinity on the number of singing whales. Two Marine Autonomous Recording Units (MARUs) were deployed between March and December 2008 in the offshore environment. Song was first heard in mid June and continued through the remaining duration of the study. Seismic survey activity was heard regularly during two separate periods, consistently throughout July and intermittently in mid-October/November. Numbers of singers were counted during the first ten minutes of every hour for the period from 24 May to 1 December, and Generalized Additive Mixed Models (GAMMs) were used to assess the effect of survey day (seasonality), hour (diel variation), moon phase and received levels of seismic survey pulses (measured from a single pulse during each ten-minute sampled period) on singer number. Application of GAMMs indicated significant seasonal variation, which was the most pronounced effect when assessing the full dataset across the entire season (p<0.001); however seasonality almost entirely dropped out of top-ranked models when applied to a reduced dataset during the July period of seismic survey activity. Diel variation was significant in both the full and reduced datasets (from p<0.01 to p<0.05) and often included in the top-ranked models. The number of singers significantly decreased with increasing received level of seismic survey pulses (from p<0.01 to p<0.05); this explanatory variable was included among the top ranked models for one MARU in the full dataset and both MARUs in the reduced dataset. This suggests that the breeding display of humpback whales is disrupted by seismic survey activity, and thus merits further attention and study, and potentially conservation action in the case of sensitive breeding populations.Salvatore CerchioSamantha StrindbergTim CollinsChanda BennettHoward RosenbaumPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 3, p e86464 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Salvatore Cerchio Samantha Strindberg Tim Collins Chanda Bennett Howard Rosenbaum Seismic surveys negatively affect humpback whale singing activity off northern Angola.
description	Passive acoustic monitoring was used to document the presence of singing humpback whales off the coast of Northern Angola, and opportunistically test for the effect of seismic survey activity in the vicinity on the number of singing whales. Two Marine Autonomous Recording Units (MARUs) were deployed between March and December 2008 in the offshore environment. Song was first heard in mid June and continued through the remaining duration of the study. Seismic survey activity was heard regularly during two separate periods, consistently throughout July and intermittently in mid-October/November. Numbers of singers were counted during the first ten minutes of every hour for the period from 24 May to 1 December, and Generalized Additive Mixed Models (GAMMs) were used to assess the effect of survey day (seasonality), hour (diel variation), moon phase and received levels of seismic survey pulses (measured from a single pulse during each ten-minute sampled period) on singer number. Application of GAMMs indicated significant seasonal variation, which was the most pronounced effect when assessing the full dataset across the entire season (p<0.001); however seasonality almost entirely dropped out of top-ranked models when applied to a reduced dataset during the July period of seismic survey activity. Diel variation was significant in both the full and reduced datasets (from p<0.01 to p<0.05) and often included in the top-ranked models. The number of singers significantly decreased with increasing received level of seismic survey pulses (from p<0.01 to p<0.05); this explanatory variable was included among the top ranked models for one MARU in the full dataset and both MARUs in the reduced dataset. This suggests that the breeding display of humpback whales is disrupted by seismic survey activity, and thus merits further attention and study, and potentially conservation action in the case of sensitive breeding populations.
format	article
author	Salvatore Cerchio Samantha Strindberg Tim Collins Chanda Bennett Howard Rosenbaum
author_facet	Salvatore Cerchio Samantha Strindberg Tim Collins Chanda Bennett Howard Rosenbaum
author_sort	Salvatore Cerchio
title	Seismic surveys negatively affect humpback whale singing activity off northern Angola.
title_short	Seismic surveys negatively affect humpback whale singing activity off northern Angola.
title_full	Seismic surveys negatively affect humpback whale singing activity off northern Angola.
title_fullStr	Seismic surveys negatively affect humpback whale singing activity off northern Angola.
title_full_unstemmed	Seismic surveys negatively affect humpback whale singing activity off northern Angola.
title_sort	seismic surveys negatively affect humpback whale singing activity off northern angola.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/a37a414e51b94d6d800bebb909b44b21
work_keys_str_mv	AT salvatorecerchio seismicsurveysnegativelyaffecthumpbackwhalesingingactivityoffnorthernangola AT samanthastrindberg seismicsurveysnegativelyaffecthumpbackwhalesingingactivityoffnorthernangola AT timcollins seismicsurveysnegativelyaffecthumpbackwhalesingingactivityoffnorthernangola AT chandabennett seismicsurveysnegativelyaffecthumpbackwhalesingingactivityoffnorthernangola AT howardrosenbaum seismicsurveysnegativelyaffecthumpbackwhalesingingactivityoffnorthernangola
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Seismic surveys negatively affect humpback whale singing activity off northern Angola.

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