Tough life: the case of a young coastal common bottlenose dolphin repeatedly entangled
Keywords:bottlenose dolphin, longline, scarring, healing, entanglement, Ecuador
AbstractWe report the case of a young coastal bottlenose dolphin (Tursiops truncatus) hooked and entangled in artisanal fishing gear on two occasions in a period of six months. In both occasions the animal managed to get rid of the gear by itself. The case occurred in the inner estuary of Gulf of Guayaquil, Ecuador. The animal survived both events, but scars remained in various parts of the body and missed fluke tips. Photographs of the individual after the events allowed to evaluate the healing process. This case demonstrated that longlines represents a threat for this population.
Bloom P. and Jager M. (1994) The injury and subsequent healing of a serious propeller strike to a wild bottlenose dolphin (Tursiops truncatus) resident in cold waters off the Northumberland coast of England. Aquatic Mammals Journal 20(2): 59-64.
Bossley, M., and Woolfall, M.A. (2014) Recovery from severe cutaneous injury in two free ranging bottlenose dolphins (Tursiops spp.). Journal of Marine Animals and Their Ecology 7(1): 12-16
Byard, R.W., Machado, A., Woolford, L. and Boardman, W. (2012) Symetry: the key diagnosing propeller strike injuries in sea mammals. Forensic Science, Medicine and Pathology. https://doi.org/10.1007/s12024-012-9335-0.
Corkeron P.J., Morris R.J. and Bryden M.M. (1987) A note on healing of large wounds in bottlenose dolphins, Tursiops truncatus. Aquatic Mammals 13(3):96–98.
Elwen, S.H., and Leeney, R. (2010) Injury and Subsequent Healing of a Propeller Strike Injury to a Heaviside’s Dolphin (Cephalorhynchus heavisidii). Aquatic Mammals 2010 36(4): 382-387. https://doi.org/10.1578/AM.36.4.2010.382.
Félix, F. (1994) Ecology of the coastal bottlenose dolphin Tursiops truncatus in the Gulf of Guayaquil, Ecuador. Investigations on Cetacea 25:235-256.
Félix, F., Calderón, A, Vintimilla, M. and Bayas-Rea Rosa A. (2017a) Decreasing population trend in coastal bottlenose dolphin (Tursiops truncatus) from the Gulf of Guayaquil, Ecuador. Aquatic Conservation: Marine and Freshwater Ecosystems 27(4): 856-866. https://doi.org/10.1002/aqc.2763
Félix, F., Centeno, R., Romero, J., Zavala, M. and Vásconez, O. (2017b) Prevalence of scars from anthropogenic origin in coastal bottlenose dolphin in Ecuador. Journal of the Marine Biological Association of the United Kingdom, 1-10. https://doi.org/10.1017/S0025315417000686
Freitas Nery M., Especie M.A. and Marino Simão S. (2008) Marine tucuxi dolphin (Sotalia guianensis) injuries as a possible indicator of fisheries interaction in southeastern Brazil. Brazilian Journal of Oceanography 56, 313–316, online version. http://dx.doi.org/10.1590/S1679-87592008000400007.
Herrera M., Castro R., Coello D., Saa I., Elías E. (2013) Ports, coves and artisanal fishing settlements on mainland Ecuador). Instituto Nacional de Pesca, Ecuador. Boletín Especial 4(1):616 p (Vols 1 and 2).
Hucke-Gaete, R., Moreno, C. and Arata, J. (2002) Operational interactions between marine mammals and the Patagonian toothfish (Dissostichus eleginoides) fishery of southern Chile. pp. 10-2. In: M. Donoghue, R. Reeves and G. Stone (eds.) New England Aquarium Forum Series Report. 03-1. Report of the Workshop on Interactions Between Cetaceans and Longline Fisheries, Apia, Samoa, November 2002. New England Aquarium Press, Boston.
Lavigne, D. (2003). Marine mammals and fisheries: The role of science in the culling debate. P 31-47. In: N.Gales, M. Hindell, and R. Kirkwood (eds) Marine Mammals: Fisheries, Tourism, and Management Issues. CSIRO, Collingwood, Australia.
Orams, M.B., and Deakin, R.B. (1997) Report on the healing of a large wound in a bottlenose dolphins Tursiops truncatus. Pages 170–173 in M. Hindell and C. Kemper (eds) Marine mammal research in the Southern Hemisphere. Volume 1. Status, ecology and medicine. Beatty & Sons, Chipping Norton, Surrey, U.K.
Parsons, E.C.M. and Jefferson, T. A. (2000) Post-mortem investigations on stranded porpoises from Hong Kong waters. Journal of Wildlife Diseases 36(2): 342-356.
Read A.J., Drinker P. and Northridge S. (2006) Bycatch of marine mammals in U.S. and global fisheries. Conservation Biology 20: 163−169. https://doi.org/10.1111/j.1523-1739.2006.00338.x.
Rechimont, M.E., Lara-Domínguez, A.L., Morteo, E., Martínez-Serrano, I. and Eduihua, E. (2018) Depredation by coastal bottlenose dolphins 8Tursiops truncatus) in the Southwestern Gulf of Mexico in relation to fishing techniques. Aquatic Mammals 44(5): 458-470.
Reeves R.R., McClellan K. and Werner T.B. (2013) Marine mammal bycatch in gillnet and other entangling net fisheries, 1990 to 2011. Endangered Species Research 20:71-97. https://doi.org/10.3354/esr00481.
Robbins, J., and Mattila, D.K. (2001) Monitoring entanglements of humpback whales (Megaptera novaeangliae) in the Gulf of Maine on the basis of caudal peduncle scarring. Document SC/53/NAH25 presented to the Scientific Committee of the International Whaling Commission. London, UK. 12 p.
Robinson, K.P. (2013) Agonistic intraspecific behavior in free-ranging bottlenose dolphins: Calf-directed aggression and infanticidal tendencies by adult males. Marine mammal Science, 30(1):381-388. https://doi.org/10.1111/mms.12023.
Van Waerebeek, K., Baker, A.N., Félix, F., Gedamke, J., Iñiguez, M., Sanino, G.P., Secchi, E., Sutaria, D., van Helden, A. and Wang, Y. (2007) Vessel collisions with small cetaceans worldwide and with large whales in the Southern Hemisphere, and initial assessment. Latin American Journal of Aquatic Mammals 6(1):43-69.
Werner, T.B., Northridge, S., McClellan, K. and Young, N. (2015) Mitigating bycatch and depredation of marine mammals in longline fisheries. ICES Journal of Marine Science, 72(5), 1576–1586. https://doi.org/10.1093/icesjms/fsv092.
Wilkinson, K. A., Wells, R., Pine III, W. E., and Borkhataria, R. R. (2017) Shark bite scar frequency in resident common bottlenose dolphins (Tursiops truncatus) in Sarasota Bay, Florida. Marine mammal Science 33(2):678-686. https://doi.org/10.1111/mms.12385.
Würsig B. and Würsig M. (1977) The photographic determination of group size, composition, and stability of coastal porpoises (Tursiops truncatus). Science 198: 755–756.
Zasloff, M. (2011) Observations on the remarkable (and mysterious) wound-healing process of the bottlenose dolphin. Journal of Investigative Dermatology 131: 2503-2505. https://doi.org/10.1038/jid.2011.220.
LicenseAuthors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).