Using passive acoustic monitoring to investigate the occurrence of cetaceans in a protected marine area in northwest Ireland

Todd, Nicole R. E.; Cronin, Michelle; Luck, C.P.; Bennison, Ashley; Jessopp, Mark; Kavanagh, Ailbhe S.

doi:10.1016/j.ecss.2019.106509

Cited by 13 publications

(22 citation statements)

References 49 publications

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“…Passive Acoustic Monitoring has been considered as a useful and cost-effective method to acquire information about the acoustic occurrence of dolphin populations on the longterm temporal scales [34,35], and to integrate information during nighttime and in bad weather conditions [36]. Moreover, long time series of data are crucial for studying circadian and seasonal rhythms in dolphins' acoustic activity [26,29].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Presence of Dolphins through Whistles Detection in Mediterranean Shallow Waters

Gregorietti

Papale

Ceraulo

et al. 2021

JMSE

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The evaluation of acoustic temporal rhythms in wide-ranging cetaceans can reveal patterns in animal spatial presence and the occurrence of periodical phenomena. Here, we aimed at assessing the temporal patterns of dolphin’s acoustic presence in a shallow-water area in the Sicily Strait (Mediterranean Sea). Whistles were collected continuously for 14 months from an acoustic monitoring station installed aboard of an elastic seamark. Over a total of 6955 h of recording, 14,048 signals were identified using both automatic and visual methods. Three parameters were analyzed: hourly presence (HP), used as a proxy of the presence of dolphins in the area; detection rate (DR), indicating the acoustic activity rate of dolphins measured per hour in the entire dataset; and detection rate in presence of dolphins (DRD), indicating the acoustic activity rate of dolphins considering only the hours when whistles were recorded. The highest values of both HP and DR were reached during the night, and the Autumn and Winter months, suggesting an increase in the dolphin’s occurrence and a possible moving away and towards the monitoring station potentially following prey. DRD, instead, showed an almost uniform distribution throughout the day implying that when the animals are close to the monitoring station, the acoustic activity does not show any pattern. However, possible changes in the communication exchange along the seasons were suggested. This study complements other work on this subject, improving the knowledge of dolphins’ acoustic activity in the area.

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Section: Introductionmentioning

confidence: 99%

Acoustic Presence of Dolphins through Whistles Detection in Mediterranean Shallow Waters

Gregorietti

Papale

Ceraulo

et al. 2021

JMSE

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“…Previous research has shown that when bottlenose dolphins and harbor porpoises utilize the same habitat, their occurrence tends to be temporally partitioned. For example, Todd et al [39] found a negative temporal correlation between harbor porpoise and bottlenose dolphin detections at Broadhaven Bay in Northern Ireland, and Nuuttila et al [17] demonstrated three types of temporal partitioning between bottlenose dolphins and porpoises: seasonal, diel, and tidal. It is possible that partitioning occurs to reduce competition for prey and minimize the risk of aggressive encounters.…”

Section: Discussionmentioning

confidence: 99%

“…In addition to the environmental variables, acoustic detections of harbor porpoises were also recorded to examine the relationship between harbor porpoise presence and dolphin presence at the study sites. Bottlenose dolphins are known to interact aggressively with harbor porpoises and previous research has shown temporal partitioning of habitat use by dolphin and harbor porpoises [17,31,39].…”

Section: Environmental Datamentioning

confidence: 99%

“…GEE-GLM model selection proceeded similarly to the GLM model selection, with a hypothesis-testing procedure where a Wald test was used to identify non-significant predictors and with each round of model selection, the non-significant predictors were removed and the model was refitted until all of the remaining predictors were significant [40]. Models with lower QIC values were preferred over those with a higher QIC value (MESS package in R) [39,[48][49][50].…”

Section: Statistical Modellingmentioning

confidence: 99%

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Acoustic Monitoring of a Bottlenose Dolphin (Tursiops truncatus) Population: Trends in Presence and Foraging beyond the Limits of the Lower River Shannon SAC

Charish

Berrow

O’Brien

2021

JMSE

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The Shannon dolphins are a population of bottlenose dolphins resident year round within the Lower River Shannon SAC, Ireland, which has been designated to protect this relatively small, genetically discrete population. Although trends in habitat use and foraging have been studied within the estuary, little is known about the movements of the Shannon dolphins outside the boundaries of the SAC, and whether any other foraging hotspots exist for this population outside of the estuary. The purpose of this study was to explore the presence and foraging behavior of these dolphins in adjacent waters located 20–30 km to the southwest of the Lower River Shannon SAC. Static acoustic monitoring was carried out with C-PODs deployed in Ballyheigue Bay, Brandon Bay, and around the Maharees between May and November 2013. A GEE-GLM modelling approach was then used to analyze potential significant environmental predictors of presence and foraging by bottlenose dolphins at these sites. Brandon Bay was found to be a site of particular importance for the Shannon population, where dolphins were present on 92% of days monitored and foraging occurring on 20% of all monitored hours. The results of this study indicate that Brandon Bay is a potentially important habitat for the Shannon dolphins and further support designation of this site as a candidate SAC. However, long-term acoustic monitoring should be conducted at all sites to identify relative use of the areas at year-round and inter-annual scales.

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“…O Monitoramento Acústico Passivo (MAP), que utiliza de hidrofones para converter energia mecânica em energia elétrica (AU & HASTINGS, 2008), tem sido amplamente utilizado em pesquisas que avaliem o ambiente acústico marinho e contribuído com estudos que acrescentam informações e esforços para a conservação dos cetáceos (ZIMMER, 2011;ERBS et al 2017). Além de ser uma ferramenta menos invasiva, é útil ao permitir o monitoramento contínuo em condições meteorológicas adversas e durante períodos noturnos em que as observações visuais não são possíveis (MELLINGER et al 2007;BINDER & HINES, 2014;ERBS et al 2017;TODD et al 2020).…”

Section: Capítulo I Introdução Geralunclassified

Uso de assobios na identificação de delfinídeos (Odontoceti: Delphinidae) para o oceano Atlântico Sul ocidental

Machado¹

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O grupo dos Cetáceos, formado basicamente por baleias, botos e golfinhos evoluiu em um ambiente que propiciou o desenvolvimento de sistemas complexos de comunicação acústica. Devido às suas propriedades físicas, o som viaja cerca de cinco vezes mais rápido na água do que no ar, sendo uma das energias mais eficientes no meio aquático. Sendo assim, os cetáceos são animais vocalmente ativos. Golfinhos da família Delphinidae destacam-se por apresentarem um complexo comportamento vocal, formado por assobios, cliques de ecolocalização e pulsos explosivos. Esses sons são utilizados na realização de diversas tarefas, tais como socialização, caça, navegação e discriminação de objetos. Além de características morfológicas, como posição da nadadeira dorsal, presença de manchas ou padrões de coloração, os sinais acústicos produzidos por esses animais podem ser utilizados na identificação ao nível de espécie. Bioacústica é a ciência responsável por estudar os mecanismos e forças envolvidas na produção, recepção e propagação do som. Essa área do conhecimento tem crescido nos últimos anos para o estudo de cetáceos devido às dificuldades em estudar esses animais em seu habitat natural, que permanecem submersos por longos minutos e apresentam um comportamento que dificulta a aproximação de pesquisadores para identificação da espécie. Algoritmos de classificação acústica têm sido desenvolvidos e aprimorados por se mostrarem extremamente úteis em situações que impossibilitam ou dificultam a observação de delfinídeos. Condições meteorológicas adversas como ventos, chuvas, estado do mar alto, períodos noturnos e de baixa visibilidade podem comprometer a identificação visual e o estudo com esses mamíferos. Com base nisso, este trabalho buscou classificar espécies de delfinídeos com base apenas em seu repertório acústico para o oceano Atlântico Sul ocidental. Foi possível identificar acusticamente três espécies: Delphinus delphis, Stenella frontalis e Stenella longirostris. Essas espécies foram frequentemente avistadas durante o Projeto Talude, uma pesquisa realizada entre 2013 a 2015 nos taludes sul e sudeste do Brasil. Provavelmente essas espécies também estavam acusticamente disponíveis quando condições meteorológicas não propícias não permitiram a identificação visual pelos observadores de bordo. Trabalhos como esse podem contribuir com a conservação dos cetáceos, que sofrem constantemente com os impactos causados por humanos em seu ambiente.

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Using passive acoustic monitoring to investigate the occurrence of cetaceans in a protected marine area in northwest Ireland

Cited by 13 publications

References 49 publications

Acoustic Presence of Dolphins through Whistles Detection in Mediterranean Shallow Waters

Acoustic Presence of Dolphins through Whistles Detection in Mediterranean Shallow Waters

Acoustic Monitoring of a Bottlenose Dolphin (Tursiops truncatus) Population: Trends in Presence and Foraging beyond the Limits of the Lower River Shannon SAC

Uso de assobios na identificação de delfinídeos (Odontoceti: Delphinidae) para o oceano Atlântico Sul ocidental

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