Bottlenose dolphin<i>Tursiops truncatus</i>at São Tomé Island (São Tomé and Príncipe) — relative abundance, site fidelity and social structure

Pereira, Andreia; Martinho, Francisco; Brito, Cristina; Carvalho, Inês

doi:10.2989/1814232x.2013.850444

Cited by 4 publications

(3 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…23.4, 2) is a cosmopolitan species with a worldwide distribution in tropical and temperate regions (Rice 1998). It is the most commonly sighted small cetacean species around São Tomé and occurs regularly throughout the year (Pereira et al 2013). The average group size for this species was estimated at 45 individuals.…”

Section: Stenella Coeruleoalbamentioning

confidence: 99%

“…Calves and juveniles were sighted regularly with adults. Pereira et al (2013) photo-identified 140 individuals during sightings from 2002 to 2006 and 2012 around São Tomé. The sightings occurred mainly around Rolas Islet and to the northeast of São Tomé (adjacent to São Tomé city), sometimes very close to shore.…”

Section: Stenella Coeruleoalbamentioning

confidence: 99%

“…Most sightings around São Tomé were recorded below the 200 m bathymetry. Some of the individuals identified showed a degree of site fidelity (Pereira et al 2013). Eight individuals recorded from 2002 to 2006 were resighted in 2012, and one of them was sighted in every survey year.…”

Section: Stenella Coeruleoalbamentioning

confidence: 99%

See 2 more Smart Citations

Cetaceans of São Tomé and Príncipe

Carvalho

Pereira

Martinho

et al. 2022

Biodiversity of the Gulf of Guinea Oceanic Islands

View full text Add to dashboard Cite

The Gulf of Guinea is a marine biodiversity hotspot, but cetacean fauna in these waters is poorly studied and our knowledge is documented mostly from opportunistic (sightings and strandings) and whaling data. This chapter presents a short review of historical whaling in the Gulf of Guinea and an update of cetacean biodiversity in the waters of São Tomé and Príncipe. Observations since 2002 have confirmed the presence of 12 species of cetaceans, 5 of them new to the region (Striped Dolphin, Rough-toothed Dolphin, Risso’s Dolphin, Pygmy Killer Whale, and Dwarf Sperm Whale). The archipelago seems to be an important area for cetaceans, with some species (Bottlenose Dolphin and Pantropical Spotted Dolphin) being present throughout the year. The volcanic origin of the archipelago produces great depths very close to the coast, which may favor the approach of pelagic species like Sperm Whales, Killer Whales, and Short-finned Pilot Whales. Bays and shallow waters may also serve as protection or rest areas for particular groups, like mother and calf pairs of Humpback Whales. Major anthropogenic threats to cetaceans in São Tomé and Príncipe include habitat degradation due to overfishing, fisheries interactions, possibly some occasionally directed takes and, more recently, oil and gas prospecting. Consistent and dedicated research to inform national legislation, together with increasing environmental awareness and local engagement, would help to identify effective cetacean conservation strategies in the archipelago.

show abstract

Section: Stenella Coeruleoalbamentioning

confidence: 99%

Section: Stenella Coeruleoalbamentioning

confidence: 99%

See 1 more Smart Citation

Cetaceans of São Tomé and Príncipe

Carvalho

Pereira

Martinho

et al. 2022

Biodiversity of the Gulf of Guinea Oceanic Islands

View full text Add to dashboard Cite

show abstract

The first confirmed decline of a delphinid population from Brazilian waters: 2000–2015 abundance of Sotalia guianensis in Guanabara Bay, South-eastern Brazil

Azevedo

Carvalho

Kajin

et al. 2017

Ecological Indicators

View full text Add to dashboard Cite

Abundance and site fidelity of bottlenose dolphins off a remote oceanic island (Reunion Island, southwest Indian Ocean)

Estrade

Dulau

2020

Marine Mammal Science

View full text Add to dashboard Cite

This study represents the first comprehensive assessment of the population dynamics and residency of common bottlenose dolphin around Reunion Island (southwest Indian Ocean). Understanding dynamics and movement patterns of this local population is essential to guide effective conservation efforts, notably in a context of growing dolphin‐watching activities. Dedicated surveys based on photo‐identification methods were conducted over 6 years (2010–2015). The species was present year‐round, in groups of 25 individuals on average (1–150). Jolly‐Seber mark‐recapture models resulted in a population estimate of 254 individuals (95% CI = 191–337) and an apparent annual survival rate of 0.83. The population was almost equally split into three residency patterns: residents (33.1%), long‐term visitors (32.6%), and short‐term visitors (34.3%, including transients, i.e., individuals only seen once [14.9%]), suggesting that the majority of the population showed a moderate‐to‐high level of residency in the study area. Individuals from the three residency patterns associated randomly, mixing together and forming a single community. Models based on the lagged identification rate indicated emigration and reimmigration to the survey area, with some individuals occupying the study area for about 2 years (832 days), and remaining outside for an average of 276 days, probably exhibiting larger home ranges and extensive movement behavior.

show abstract

Bottlenose dolphinTursiops truncatusat São Tomé Island (São Tomé and Príncipe) — relative abundance, site fidelity and social structure

Cited by 4 publications

References 27 publications

Cetaceans of São Tomé and Príncipe

Cetaceans of São Tomé and Príncipe

The first confirmed decline of a delphinid population from Brazilian waters: 2000–2015 abundance of Sotalia guianensis in Guanabara Bay, South-eastern Brazil

Abundance and site fidelity of bottlenose dolphins off a remote oceanic island (Reunion Island, southwest Indian Ocean)

Contact Info

Product

Resources

About