Environmental factors governing the distribution of the bottlenose (Tursiops truncatus) and the spotted dolphin (Stenella attenuata) in Golfo Dulce, South Pacific, off Costa Rica

Cubero-Pardo, Priscilla

doi:10.4067/s0717-71782007000200002

Cited by 16 publications

(19 citation statements)

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“…La presencia de los delfínes nariz de botella y manchado durante todo el año se establece como un patrón muy común (González et al, 2007;Leatherwood y Reeves, 1990;May-Collado y Forcada, 2012;Reeves et al, 2002). Sin embargo, para la zona acantilada de La Libertad, la presencia de T. truncatus es mayor a S. attenuata durante la época seca, coincidiendo con Palacios (2007), donde nunca se avistaron juntas y la unión temporal fue mínima, mostrando que cada especie ocupa, claramente, la misma región en tiempos diferentes, como lo menciona Cubero-Pardo (2007). Según Acevedo y Burkhart (1998), estas especies pueden estar evitándose entre sí o una evitando el área ocupada por la otra.…”

Section: Discussionunclassified

“…La distribución espacial y temporal de los cetáceos está influenciada por una serie de variables ambientales, antrópicas, climatológicas (Cubero-Pardo, 2007;Griffin y Griffin, 2010;Martínez et al, 2011;Smith et al, 2016), también por resultado de migraciones a corta escala (Milmann et al, 2016). Así mismo, otros componentes que influyen son la presencia de especies depredadoras de mamíferos marinos de órdenes mayores y consumidores en el área y factores antrópicos, como las actividades de pesca y el tráfico marítimo, que generan colisiones con los delfines (Guzmán et al, 2012).…”

Section: Introductionunclassified

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Distribución temporal de Stenella attenuata y Tursiops truncatus en La Libertad, El Salvador

Ascencio-Elizondo

Segovia

2019

Rev.Mex.Biodiv.

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Resumen El comportamiento, la abundancia y la distribución de los mamíferos marinos se asocian con la estacionalidad de la temperatura superficial del agua y la profundidad de la termoclina. El Salvador no posee registros sobre distribución y abundancia de cetáceos. El objetivo de este estudio fue describir la abundancia y distribución temporal de Stenella attenuata y Tursiops truncatus, observados desde los acantilados de La Libertad, El Salvador. La información fue obtenida en 28 días de avistamiento desde la costa, entre octubre 2015 y mayo 2016, en los cuales se hicieron observaciones de 12 horas diarias. El total de individuos registrados fue 74 (49 T. truncatus y 25 S. attenuata). El análisis estadístico de conglomerados evidenció 2 agrupamientos: 1) con alta abundancia de S. attenuata (enero y abril, 2016) y 2) 2 subgrupos para T. truncatus donde, el primero registra baja abundancia (febrero y marzo, 2016) y el segundo, alta abundancia (octubre y diciembre, 2015). Los resultados mostraron que la distribución temporal para T. truncatus sucede en octubre y diciembre; para S. attenuata, en enero y abril. Al presentarse esta temporalidad, no se observó ninguna mezcla de escuelas de ambas especies.

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Section: Discussionunclassified

Section: Introductionunclassified

Distribución temporal de Stenella attenuata y Tursiops truncatus en La Libertad, El Salvador

Ascencio-Elizondo

Segovia

2019

Rev.Mex.Biodiv.

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“…The two dolphin species are mostly found in different areas of the gulf: bottlenose dolphins tend to frequent shallower waters near shore or rivers, with steep marine slopes, while pan-tropical spotted dolphins tend to occur away from shore in deeper water [31,32]. The distribution of both species varies seasonally, yet no overlap between the two has been observed [31,32]. It is believed that the lack of overlap is due to habitat partitioning as a result of diet discrimination [33].…”

Section: Methodsmentioning

confidence: 99%

The social structure of Golfo Dulce bottlenose dolphins (Tursiops truncatus) and the influence of behavioural state

Moreno

Acevedo‐Gutiérrez

2016

R. Soc. open sci.

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Ecological factors such as habitat and food availability affect the social structure of bottlenose dolphins (Tursiops spp.). Here, we describe the social structure of bottlenose dolphins (T. truncatus) in Golfo Dulce, Costa Rica, a semi-enclosed, fjord-like tropical embayment resembling a pelagic system. We also examine behaviour-linked social strategies by comparing social structure relative to behavioural state: feeding versus non-feeding. We analysed 333 sightings over 210 days from boat-based surveys. Despite the uniqueness of the area, the 47 analysed adults had a social structure similar to other populations: a well-differentiated fission–fusion society with sex-specific patterns of associations and aggression. These results indicate that differences in social structure relative to other populations were a matter of degree. Association strength of dyads was highly correlated across behavioural states, indicating constraints on social fluidity. Males displayed a marked difference in lagged association rate and females displayed a small difference in association homogeneity between states. We suggest this difference in population-wide social connections between behavioural states, particularly for males, was due to mating strategies, a pressure which is strongest during non-feeding behaviour and relaxed during feeding. This finding highlights the importance of considering behavioural state when examining individual bonds and the behavioural plasticity for which the bottlenose dolphin is well known.

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“…Many factors can influence the spatial and temporal distributions of cetaceans. They include physiographic characteristics such as water depth and seafloor slope (Cañadas et al, 2002;Baumgartner, 2006;Cubero-Pardo, 2007;Gómez de Segura et al, 2008;Azzellino et al, 2012), environmental factors such as sea surface temperature and salinity (Reilly, 1990), and biological factors such as prey distribution and breeding areas (Palacios et al, 2013). Important habitats require areas for feeding, breeding, socializing, and calving, as well as nursing and raising calves (Hoyt, 2011).…”

Section: Introductionmentioning

confidence: 99%

Spatial Distribution and Abundance of Small Cetaceans in the Pacific Waters of Guatemala

et al. 2021

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The establishment of marine protected areas (MPAs) requires a thorough assessment of the abundance, distribution, and habitat preferences of a variety of marine species. Small cetacean spatial distribution and abundance were examined in the Pacific waters of Guatemala to provide this information. Boat surveys were conducted for 38 months between January 2008 and June 2012. A total of 64,678 cetaceans in 505 sightings from nine Delphinidae species were recorded. Three species, referred to as common species, accounted for 90% (n = 456) of all sightings. They included Tursiops truncatus (56%, n = 278), Stenella attenuata (29%, n = 143), and Stenella longirostris (7%, n = 35). Group size was significantly different among the common species (p < 0.001). S. longirostris had the largest group size (444 ± 75 dolphins), followed by S. attenuata (28 ± 5 dolphins), and T. truncatus (15 ± 2 dolphins). T. truncatus was the most common in the study area (0.02 ± 0.002 sightings/km of survey effort), and S. attenuata (0.37 ± 0.16 dolphins/km) and S. longirostris (1.62 ± 0.41 dolphins/km) were the most abundant in the neritic (≤200 m depth) and oceanic zones (≥200 m depth), respectively. The wide-ranging distribution of T. truncatus overlapped with the distribution of S. attenuata in the neritic zone and S. longirostris in the oceanic zone. Little overlap was observed in the distribution of S. attenuata and S. longirostris. Most hot spots (∼66%) were in the oceanic zone and no hot spots were near or in the MPAs. Hot spots were identified along the 200 m isobath, the Middle America trench, and the San José Canyon. These could be areas of high productivity where dolphins concentrate to feed. To the north of the San José Canyon, five species of small cetaceans were observed in a stretch of the neritic zone including three MPAs. No other section of this zone had such high diversity. Results need to be taken with caution given the small sample size. Our results suggest that the protection of small cetaceans needs to consider the creation of oceanic MPAs that should be integrated into the existing network.

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Environmental factors governing the distribution of the bottlenose (Tursiops truncatus) and the spotted dolphin (Stenella attenuata) in Golfo Dulce, South Pacific, off Costa Rica

Cited by 16 publications

References 10 publications

Distribución temporal de Stenella attenuata y Tursiops truncatus en La Libertad, El Salvador

Distribución temporal de Stenella attenuata y Tursiops truncatus en La Libertad, El Salvador

The social structure of Golfo Dulce bottlenose dolphins (Tursiops truncatus) and the influence of behavioural state

Spatial Distribution and Abundance of Small Cetaceans in the Pacific Waters of Guatemala

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