Distribution and relative abundance of sperm whales in relation to key environmental features, squid landings and the distribution of other cetacean species in the Gulf of California, Mexico

Jaquet, Nathalie; Gendron, Diane

doi:10.1007/s00227-002-0839-0

Cited by 69 publications

(2 citation statements)

References 22 publications

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“…macrocephalus are examples of such pelagic and deep diving species and had the highest stranding incidence in the region, which occurred during the upwelling seasons. Both species’ distribution having been correlated to prey related drivers in previous studies in the Sargasso Sea and north-east Atlantic Ocean [50, 51]…”

Section: Discussionmentioning

confidence: 99%

Cetacean biodiversity, spatial and temporal trends based on stranding records (1920-2016), Victoria, Australia

Foord¹,

Rowe

Robb³

2019

PLoS ONE

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Cetacean stranding records can provide vital information on species richness and diversity through space and time. Here we collate stranding records from Victoria, Australia and assess them for temporal, spatial and demographic trends. Between 1920 and 2016, 424 stranding events involving 907 individuals were recorded across 31 Cetacea species from seven families, including five new species records for the state. Seven of these events were mass strandings, and six mother and calf strandings were recorded. Importantly, 48% of the species recorded are recognised as data deficient on the IUCN Red List. The most commonly recorded taxa were Tursiops spp. (n = 146) and Delphinus delphis (common dolphins, n = 81), with the greatest taxonomic richness (n = 24) and highest incidence of stranding events documented within the Otways mesoscale bioregion. We found no seasonal stranding patterns anywhere in the state. While our findings improve understanding of the spatial and temporal patterns of cetacean diversity within Victoria, we suggest greater effort to collect demographic data at stranding events in order to better study state-wide patterns through time. We conclude with guidelines for minimum data collection standards for future strandings to maximise information capture from each event.

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Section: Discussionmentioning

confidence: 99%

Cetacean biodiversity, spatial and temporal trends based on stranding records (1920-2016), Victoria, Australia

Foord¹,

Rowe

Robb³

2019

PLoS ONE

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“…The glider observations were designed to monitor an oceanographic hotspot (~2500 km 2 ) of intense deep mixing events occurring in winter that are likely to favour prey availability and therefore constitute favourable sperm whale habitat. Prey availability plays a key role in sperm whale distribution, as the whales adapt their distribution and group size to the size of prey patches (Relini et al 2000, Jaquet & Gendron 2002, Drouot et al 2004c, Soria et al 2009.…”

Section: Spatial Distributionmentioning

confidence: 99%

Sperm whale presence observed using passive acoustic monitoring from gliders of opportunity

Cauchy

Heywood

Risch

et al. 2020

Endang. Species. Res.

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Habitat use by the endangered Mediterranean sperm whale subpopulation remains poorly understood, especially in winter. The sustained presence of oceanographic autonomous underwater vehicles in the area presents an opportunity to improve observation effort, enabling collection of valuable sperm whale distribution data, which may be crucial to their conservation. Passive acoustic monitoring loggers were deployed on vertically profiling oceanographic gliders surveying the north-western Mediterranean Sea during winter 2012-2013 and June 2014. Sperm whale echolocation ‘usual click’ trains, characteristic of foraging activity, were detected and classified from the recordings, providing information about the presence of sperm whales along the glider tracks. Widespread presence of sperm whales in the north-western Mediterranean Sea was confirmed. Winter observations suggest different foraging strategies between the Ligurian Sea, where mobile and scattered individuals forage at all times of day, and the Gulf of Lion, where larger aggregations target intense oceanographic features in the open ocean such as fronts and mixing events, with reduced acoustic presence at dawn. This study demonstrates the ability to successfully observe sperm whale behaviour from passive acoustic monitoring gliders. We identified possible mission design changes to optimize data collected from passive acoustic monitoring glider surveys and significantly improve sperm whale population monitoring and habitat use.

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2005

Cephalopods

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Distribution and relative abundance of sperm whales in relation to key environmental features, squid landings and the distribution of other cetacean species in the Gulf of California, Mexico

Cited by 69 publications

References 22 publications

Cetacean biodiversity, spatial and temporal trends based on stranding records (1920-2016), Victoria, Australia

Cetacean biodiversity, spatial and temporal trends based on stranding records (1920-2016), Victoria, Australia

Sperm whale presence observed using passive acoustic monitoring from gliders of opportunity

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