Occurrence, abundance, range, and residence patterns of Tursiops truncatus on the coast of Aragua, Venezuela

Cobarrubia-Russo, Sergio; Barreto, Guillermo R.; Quintero‐Torres, Enrique; Molero-Lizarraga, Alimar

doi:10.1007/s13364-018-0401-1

Cited by 7 publications

(15 citation statements)

References 28 publications

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“…The photo-identified individuals belonged to a resident pod (A) which was sighted throughout the study. This pod was composed of females, mother-calves and visitors (Cobarrubia-Russo et al ., 2018). All the individuals for whom the home ranges were estimated by MCP and FK were adult females.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the home ranges of A1 and A2 could be used to estimate the feeding home range of this pod, which demonstrated high site fidelity during the study, due to the fact that most sightings of A1 and A2 include other females and mother-calf pairs (Cobarrubia-Russo, 2010; Cobarrubia-Russo et al ., 2018).…”

Section: Discussionmentioning

confidence: 99%

“…The western coast of Aragua State, Venezuela, is an oceanic coast with semi-enclosed (bays and sounds), open and neritic habitats that hosts a resident population of bottlenose dolphins but is also frequented by non-resident dolphins throughout the year. This coastal region is also inhabited by a population of Atlantic spotted dolphin Stenella frontalis that occurs all year round and is sighted more frequently than T. truncatus (Cobarrubia-Russo, 2010; Cobarrubia-Russo et al ., 2018). The purpose of this study is to estimate the home range of resident Tursiops truncatus individuals and analyse the ranges of S. frontalis and fishermen in order to detect possible overlaps that could define an area of extreme importance to be considered for greater conservation protection.…”

Section: Introductionmentioning

confidence: 99%

“…Latitude and longitude of fishing boats and other cetacean species were also recorded. In the study area S. frontalis appears more frequently than T. truncatus and is also present throughout the year (Acevedo, 2007;Cobarrubia-Russo, 2010;Cobarrubia-Russo et al, 2018). After the initial encounter with T. truncatus, an observer photographed every individual possible for photo-identification.…”

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confidence: 99%

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Individual home ranges of Tursiops truncatus and their overlap with ranges of Stenella frontalis and fishermen in Aragua, Venezuela, South Caribbean

et al. 2020

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Abstract The coast of Aragua is a home of bottlenose dolphins (BND), Atlantic spotted dolphins (ASD) and fishermen (FIS) from four towns. A photo-identification study was carried out on BND to estimate their home ranges. From 2004 to 2008, 100 field surveys were carried out along 30 km of coastline (92.12 km2). In each sighting of BND, information regarding date, time, latitude/longitude and photographs were registered (ASD and FIS were registered without photography). The data were analysed using a Geographic Information System to estimate Minimum Convex Polygon (MCP) and Fixed Kernel (FK) at 95%. The home ranges of BND were estimated for seven individuals. This included three females (29–31 sightings) with estimated areas ranging from 33.90–39.90 km2 with MCP (36.79–43.31% of the study area) and from 80.47–101.31 km2 with FK (109.97–104.26%). For the remaining four dolphins (14–20 sightings) the estimated areas ranged from 9.67–22.34 km2 (MCP), the predominant depth of these home ranges varied from 51–100 m (χ2 = 24.5, df = 2, P = 4.785 × 10−6). For the pods of ASD the estimated area ranged 75.23 km2 with MCP (81.66%) and 119.86 km2 with FK (130.11%) with predominant depths of 101–200 m (χ2 = 24.5, df = 2, P = 4.785 × 10−6). The area used by FIS ranged 93.27 km2 by MCP and 228.49 km2 by FK. Finally, the overlap area of BND, ASD and FIS ranged 24.75 km2 (26.86%). We point out this locality presents important oceanographic and ecological aspects which deserve to be the subject of application of management plans for the conservation of its habitat and species.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Individual home ranges of Tursiops truncatus and their overlap with ranges of Stenella frontalis and fishermen in Aragua, Venezuela, South Caribbean

et al. 2020

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“…In open or exposed coastlines like the Wild Coast, mobile species are expected to range more widely and have lower site fidelity than in protected shallow bays (Cobarrubia‐Russo, Barreto, Quintero‐Torres, Molero‐Lizarraga, & Wang, 2019; Defran & Weller, 1999; Haughey, Hunt, Hanf, Rankin, & Parra, 2020; Hwang et al, 2014). In total 253 individuals (46.7%) were seen more than once off the Wild Coast, and most of them were resightings within the same study area months or years later.…”

Section: Discussionmentioning

confidence: 99%

Occurrence of Indo‐Pacific bottlenose dolphins (Tursiops aduncus) off the Wild Coast of South Africa using photographic identification

Caputo

Bouveroux

Froneman

et al. 2020

Marine Mammal Science

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The present study represents the first reported boat-based photographic identification study of Indo-Pacific bottlenose dolphins (Tursiops aduncus) off the Wild Coast of southeast South Africa. This area is known for the annual sardine run, which attracts apex predators to the region during the austral winter. Dedicated photo-identification surveys were conducted along this coast at three different study sites in February, June, and November of each year from 2014 to 2016. During 47 surveys, 136 bottlenose dolphin groups were encountered, an estimated 4,474 dolphins observed, and 2,149 individuals were identified. Although most individuals (N = 1,770, 82.4%) were only observed once, some were resighted 2-7 times (N = 379, 17.6%), with an average of 305 days (range: 88-705 days) between resightings. The majority of bottlenose dolphins were resighted within the same study site (N = 192), indicating some degree of residency. However, 65 individuals were observed at two different study sites, indicating individual movements along the coast. Our findings contrast earlier suggestions that bottlenose dolphins only use the Wild Coast during the sardine run, as we found large number of animals year-round with some level of site fidelity. This highlights the importance of the Wild Coast to bottlenose dolphins and provides further information on their status off southeastern South Africa.

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Identifying suitable areas for common bottlenose dolphin in anthropized waters

et al. 2022

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Occurrence, abundance, range, and residence patterns of Tursiops truncatus on the coast of Aragua, Venezuela

Cited by 7 publications

References 28 publications

Individual home ranges of Tursiops truncatus and their overlap with ranges of Stenella frontalis and fishermen in Aragua, Venezuela, South Caribbean

Individual home ranges of Tursiops truncatus and their overlap with ranges of Stenella frontalis and fishermen in Aragua, Venezuela, South Caribbean

Occurrence of Indo‐Pacific bottlenose dolphins (Tursiops aduncus) off the Wild Coast of South Africa using photographic identification

Identifying suitable areas for common bottlenose dolphin in anthropized waters

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