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Marine Biology

, Volume 150, Issue 1, pp 149–160 | Cite as

Abundance of small cetaceans in waters of the central Spanish Mediterranean

  • Amaia Gómez de Segura
  • E. A. Crespo
  • S. N. Pedraza
  • P. S. Hammond
  • J. A. Raga
Research Article

Abstract

Seasonal aerial surveys were conducted in the waters of the central Spanish Mediterranean from 2001 to 2003 using the line transect sampling methodology to estimate cetacean abundance. The density of the three most abundant species, striped dolphin (Stenella coeruleoalba), bottlenose dolphin (Tursiops truncatus) and Risso’s dolphins (Grampus griseus), was estimated. In the case of the first two species, the density was estimated accounting for the proportion of submerged animals, while for Risso’s dolphin only the surface density could be estimated. The striped dolphin was the most abundant species in the study area with a mean density of 0.489 dolphins km−2(95% CI = 0.339–0.705) and a mean abundance of 15,778 dolphins (95% CI = 10,940–22,756). This density is comparable to that obtained in the International Ligurian Sea Cetacean Sanctuary. Striped dolphins were observed throughout the whole year and no seasonal changes in the density were detected. The mean density of bottlenose dolphins was an order of magnitude lower than that of striped dolphins (0.041 dolphins km−2; 95% CI = 0.023–0.075) with a mean abundance of 1,333 dolphins (95% CI = 739–2,407). The Risso’s dolphin had a surface estimated density of 0.015 dolphins km−2 (95% CI = 0.005–0.046) and a mean abundance of 493 dolphins (95% CI = 162–1,498). These results provide valuable biological information useful to develop conservation plans and establish a baseline for future population trend studies.

Keywords

Bottlenose Dolphin Detection Function Aerial Survey School Size Small School 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This study was carried out thanks to the financial support of the Spanish Ministry of Environment. The support of the Conselleria de Territorio y Vivienda of the Generalitat Valenciana particularly of J. Jimenez and the ALNITAK ONG especially of A. Cañadas and J. A. Vazquez is greatly appreciated. Thanks are due to all the observers who assisted in data collection: J. Martínez, P. Gonzalez, J. Barona, K. Lehnert and D. Perdiguero. The help of Dr. G. Donovan in methodological questions is also appreciated. Special thanks are due to J. Tomás and C. Agustí for their valuable contribution and support in this study.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Amaia Gómez de Segura
    • 1
  • E. A. Crespo
    • 2
  • S. N. Pedraza
    • 2
  • P. S. Hammond
    • 3
  • J. A. Raga
    • 1
  1. 1.Departmento de Zoología Marina, Instituto Cavanilles de Biodiversidad y Biología EvolutivaUniversidad de ValenciaValenciaSpain
  2. 2.Centro Nacional Patagónico (CONICET) and Universidad Nacional de la PatagoniaPuerto MadrynArgentina
  3. 3.Sea Mammal Research Unit, Gatty Marine LaboratoryUniversity of St AndrewsSt AndrewsUK

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