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Injuries, healing and management of common dolphins (Delphinus delphis) in human-impacted waters in the south Iberian Peninsula

Published online by Cambridge University Press:  10 February 2020

Liliana Olaya-Ponzone ,
Rocío Espada ,
Estefanía Martín Moreno ,
Isabel Cárdenas Marcial  and
José C. García-Gómez Open the ORCID record for José C. García-Gómez [Opens in a new window]
Liliana Olaya-Ponzone*
Affiliation:
Laboratorio de Biología Marina, Dpto. de Zoología, Facultad de Biología, Universidad de Sevilla, 41012 Avda. Reina Mercedes, 6, Sevilla, Spain
Rocío Espada
Affiliation:
Laboratorio de Biología Marina, Dpto. de Zoología, Facultad de Biología, Universidad de Sevilla, 41012 Avda. Reina Mercedes, 6, Sevilla, Spain Área de Investigación Biológica I+D+i del Acuario de Sevilla Dolphin Adventure, 9 The Square, Marina Bay, Gibraltar, 11111Gibraltar, UK MMIRC (Marine Mammals Information, Research and Conservation), Gibraltar, UK
Estefanía Martín Moreno
Affiliation:
Dolphin Adventure, 9 The Square, Marina Bay, Gibraltar, 11111Gibraltar, UK MMIRC (Marine Mammals Information, Research and Conservation), Gibraltar, UK
Isabel Cárdenas Marcial
Affiliation:
Laboratorio de Biología Marina, Dpto. de Zoología, Facultad de Biología, Universidad de Sevilla, 41012 Avda. Reina Mercedes, 6, Sevilla, Spain
José C. García-Gómez
Affiliation:
Laboratorio de Biología Marina, Dpto. de Zoología, Facultad de Biología, Universidad de Sevilla, 41012 Avda. Reina Mercedes, 6, Sevilla, Spain
*
Author for correspondence: Liliana Olaya-Ponzone, E-mail: [email protected]
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Abstract

This study focuses on the dolphins populating the water between Gibraltar and Algeciras in the south Iberian Peninsula, an area subjected to pressure due to high human activity. The area is considered an important feeding and breeding ground for common dolphins (Delphinus delphis). Due to the degree of residence of some specimens, and the large gap in knowledge about the evolution of wounds in D. delphis specimens with lacerations, this work sought to perform the following analyses: identify lacerated individuals; characterize sequences of ‘before – during – after’ with respect to the occurrence of lacerations; and associate the type of injury with its severity. This work will inform future studies by expanding a database on injured individuals and contribute to periodical monitoring of specimens that frequent these geographic areas. Between 2013 and 2017, we were able to track the healing process of five injured individuals of common dolphins from a whale-watching platform thanks to photo identification. The animals exhibited fresh external wounds from different sources. In the majority of individuals, the wound-healing processes lasted 3–21 weeks. The frequency with which sightings are made and knowledge about the local population will help track injured animals, follow their wound evolution, and document their survival rates. The documented injuries inflicted by human interactions described in this paper may include fishing interactions and propeller strikes, probably as a consequence of the high intensity of recreational fishing and whale-watching activities in the area.

Keywords

Boat trafficcommon dolphinDelphinus delphishealinginjuriesmanagementphoto-identificationpoppingthreatswhale watching
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 100 , Issue 2 , March 2020 , pp. 315 - 325
Copyright
Copyright © Marine Biological Association of the United Kingdom 2020

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