Cetacean distribution and relative abundance in offshore Gabonese waters

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)

Abstract

nformation on cetaceans off Gabon in tropical West Africa is summarized from boat-based surveys carried out between 7 March and 7 August 2009. Thirteen cetacean species were positively identified comprising two baleen whale species, one sperm whale species and ten species of delphinid. Bryde's whale (Balaenoptera brydei) and humpback whale (Megaptera novaeangliae) were the most frequently encountered species. Cetaceans were found throughout a range of sea surface temperature between 20.5°C and 27.5°C and a wide range of depths with the majority of effort and sightings occurring seaward of the shelf break. Of particular interest from the study were the following: (1) Gabonese waters have a broad cetacean diversity, especially with a large and diversified delphinid community in the northern part of the study area; (2) the variations in oceanographic conditions within Gabonese waters are likely to result in a temporal variation in species composition; (3) the sightings of Atlantic spotted dolphin (Stenella frontalis) are the first at-sea sightings confirmed for these waters, although not unexpected given their distribution and abundant presence in surrounding waters; and (4) the poorly known Clymene dolphin (Stenella clymene) was sighted on four occasions in deep oceanic waters and was the most abundant cetacean. These are the first confirmed records of Clymene dolphins in Gabonese waters.
Original languageEnglish
Pages (from-to)1613-1621
JournalJournal of the Marine Biological Association of The United Kingdom
Volume90
Issue number8
DOIs
Publication statusPublished - 2010

Fingerprint

cetacean
dolphins
Stenella (dolphin)
relative abundance
Megaptera novaeangliae
whale
dolphin
Gabon
boats
whales
Western Africa
water
surface temperature
temporal variation
species diversity
shelf break
sperm
distribution
sea surface temperature
Balaenoptera edeni

Keywords

  • stenella-clymene
  • west-africa
  • balaenoptera-edeni
  • records
  • angola
  • delphinidae
  • porpoises
  • dolphins
  • guinea
  • gulf

Cite this

@article{7e51ee5606304504859f557b9dbbd066,
title = "Cetacean distribution and relative abundance in offshore Gabonese waters",
abstract = "nformation on cetaceans off Gabon in tropical West Africa is summarized from boat-based surveys carried out between 7 March and 7 August 2009. Thirteen cetacean species were positively identified comprising two baleen whale species, one sperm whale species and ten species of delphinid. Bryde's whale (Balaenoptera brydei) and humpback whale (Megaptera novaeangliae) were the most frequently encountered species. Cetaceans were found throughout a range of sea surface temperature between 20.5°C and 27.5°C and a wide range of depths with the majority of effort and sightings occurring seaward of the shelf break. Of particular interest from the study were the following: (1) Gabonese waters have a broad cetacean diversity, especially with a large and diversified delphinid community in the northern part of the study area; (2) the variations in oceanographic conditions within Gabonese waters are likely to result in a temporal variation in species composition; (3) the sightings of Atlantic spotted dolphin (Stenella frontalis) are the first at-sea sightings confirmed for these waters, although not unexpected given their distribution and abundant presence in surrounding waters; and (4) the poorly known Clymene dolphin (Stenella clymene) was sighted on four occasions in deep oceanic waters and was the most abundant cetacean. These are the first confirmed records of Clymene dolphins in Gabonese waters.",
keywords = "stenella-clymene, west-africa, balaenoptera-edeni, records, angola, delphinidae, porpoises, dolphins, guinea, gulf",
author = "{de Boer}, M.N.",
year = "2010",
doi = "10.1017/S0025315410001165",
language = "English",
volume = "90",
pages = "1613--1621",
journal = "Journal of the Marine Biological Association of The United Kingdom",
issn = "0025-3154",
publisher = "Cambridge University Press",
number = "8",

}

Cetacean distribution and relative abundance in offshore Gabonese waters. / de Boer, M.N.

In: Journal of the Marine Biological Association of The United Kingdom, Vol. 90, No. 8, 2010, p. 1613-1621.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Cetacean distribution and relative abundance in offshore Gabonese waters

AU - de Boer, M.N.

PY - 2010

Y1 - 2010

N2 - nformation on cetaceans off Gabon in tropical West Africa is summarized from boat-based surveys carried out between 7 March and 7 August 2009. Thirteen cetacean species were positively identified comprising two baleen whale species, one sperm whale species and ten species of delphinid. Bryde's whale (Balaenoptera brydei) and humpback whale (Megaptera novaeangliae) were the most frequently encountered species. Cetaceans were found throughout a range of sea surface temperature between 20.5°C and 27.5°C and a wide range of depths with the majority of effort and sightings occurring seaward of the shelf break. Of particular interest from the study were the following: (1) Gabonese waters have a broad cetacean diversity, especially with a large and diversified delphinid community in the northern part of the study area; (2) the variations in oceanographic conditions within Gabonese waters are likely to result in a temporal variation in species composition; (3) the sightings of Atlantic spotted dolphin (Stenella frontalis) are the first at-sea sightings confirmed for these waters, although not unexpected given their distribution and abundant presence in surrounding waters; and (4) the poorly known Clymene dolphin (Stenella clymene) was sighted on four occasions in deep oceanic waters and was the most abundant cetacean. These are the first confirmed records of Clymene dolphins in Gabonese waters.

AB - nformation on cetaceans off Gabon in tropical West Africa is summarized from boat-based surveys carried out between 7 March and 7 August 2009. Thirteen cetacean species were positively identified comprising two baleen whale species, one sperm whale species and ten species of delphinid. Bryde's whale (Balaenoptera brydei) and humpback whale (Megaptera novaeangliae) were the most frequently encountered species. Cetaceans were found throughout a range of sea surface temperature between 20.5°C and 27.5°C and a wide range of depths with the majority of effort and sightings occurring seaward of the shelf break. Of particular interest from the study were the following: (1) Gabonese waters have a broad cetacean diversity, especially with a large and diversified delphinid community in the northern part of the study area; (2) the variations in oceanographic conditions within Gabonese waters are likely to result in a temporal variation in species composition; (3) the sightings of Atlantic spotted dolphin (Stenella frontalis) are the first at-sea sightings confirmed for these waters, although not unexpected given their distribution and abundant presence in surrounding waters; and (4) the poorly known Clymene dolphin (Stenella clymene) was sighted on four occasions in deep oceanic waters and was the most abundant cetacean. These are the first confirmed records of Clymene dolphins in Gabonese waters.

KW - stenella-clymene

KW - west-africa

KW - balaenoptera-edeni

KW - records

KW - angola

KW - delphinidae

KW - porpoises

KW - dolphins

KW - guinea

KW - gulf

U2 - 10.1017/S0025315410001165

DO - 10.1017/S0025315410001165

M3 - Article

VL - 90

SP - 1613

EP - 1621

JO - Journal of the Marine Biological Association of The United Kingdom

JF - Journal of the Marine Biological Association of The United Kingdom

SN - 0025-3154

IS - 8

ER -