Abstract
Interspecific interactions can be based on positive or negative outcome. Within antagonist interactions, predation refers to a predator attacking and feeding on a prey while competition is an interaction where individuals compete for a common resource. Worldwide distributions of long-finned pilot whales and killer whales rarely overlap, and they are not known to feed on the same preys. However, in this study, we described the interactions between long-finned pilot whales and killer whales in the Strait of Gibraltar. The former was seen pursuing away the latter in all observations. The main hypotheses for the cause of these interactions are predation or competition. To test both hypotheses, movement patterns and isotopic niches of both species were investigated in the Strait of Gibraltar through satellite tagging and stable isotopes, respectively. Satellite tracks showed no overlap between one tagged pilot whale and one tagged killer whaler’s distributions during 21 days. Similarly, Euclidian distances between centroids of Bayesian standard ellipse areas of carbon and nitrogen stable isotopes were significantly different from zero, showing different isotopic niches for each species. This shows that no competition for the resources should exist between both species in the Strait of Gibraltar and that they do not feed on each other, suggesting that the interactions would not be related to predation. A possible historical presence of marine mammal-eating killer whales in the area, today disappeared, could explain the antipredator defense mobbing-like behavior of pilot whales observed in the Strait.
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Acknowledgments
This study was sponsored by Loro Parque Foundation, Fundación Biodiversidad, CEPSA, EcoCet Project (CGL2011-25543, Plan Nacional de investigación del Ministerio de Economía y Competitividad). Renaud de Stephanis and Joan Giménez were supported by the Spanish Ministry of Economy and Competitiveness, through the Severo Ochoa Programme for Centres of Excellence in R + D + I (SEV-2012-0262) and by the “Subprograma Juan de la Cierva.” Thanks are given to Russ Andrews for all the assesment regarding the Satellite tag deployements and to the IFAW for providing the software Logger 2000. Great thanks are given to all the people who helped in the field (CIRCE’s volunteers) and the lab (both in the EBD-CSIC and the UAM), especially to Juan Manuel Salazar Sierra, Carolina Jiménez, David Alarcón, Susana Carrasco, and Ricardo Álvarez. Andy Foote, Tiu Similä, and Francisco Ramirez provided interesting comments on the manuscript. Further, on behalf of Mikkel-Holger Strander Sinding, we would like to give sincere thanks to the owners of HG 333 Isafold, as well as to Captain Karsten Mølgård and the crew aboard the ship allowing Mikkel-Holger to accompany them during their fisheries. Thanks to Sarah Young for the English review.
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De Stephanis, R., Giménez, J., Esteban, R. et al. Mobbing-like behavior by pilot whales towards killer whales: a response to resource competition or perceived predation risk?. acta ethol 18, 69–78 (2015). https://doi.org/10.1007/s10211-014-0189-1
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DOI: https://doi.org/10.1007/s10211-014-0189-1