caa a22 4500 605462399 CHVBK 20210128100248.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s10211-014-0189-1 doi (NATIONALLICENCE)springer-10.1007/s10211-014-0189-1 Mobbing-like behavior by pilot whales towards killer whales: a response to resource competition or perceived predation risk? [Elektronische Daten] [R. De Stephanis, J. Giménez, R. Esteban, P. Gauffier, S. García-Tiscar, M-H. Sinding, P. Verborgh] 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 21days. 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. Springer-Verlag Berlin Heidelberg and ISPA, 2014 Isotopic niche nationallicence Telemetry nationallicence Long-finned pilot whale nationallicence Killer whale nationallicence Interspecific competition nationallicence Predation nationallicence Strait of Gibraltar nationallicence De Stephanis R. Grupo de Ecología Marina Aplicada (GEMA), Estación Biológica de Doñana (CSIC), C/Americo Vespucio, s/n, 41092, Sevilla, Isla de la Cartuja, Spain aut Giménez J. Grupo de Ecología Marina Aplicada (GEMA), Estación Biológica de Doñana (CSIC), C/Americo Vespucio, s/n, 41092, Sevilla, Isla de la Cartuja, Spain aut Esteban R. CIRCE (Conservation, Information and Research on Cetaceans), Cabeza de Manzaneda 3, Pelayo, 11390, Algeciras, Cadiz, Spain aut Gauffier P. CIRCE (Conservation, Information and Research on Cetaceans), Cabeza de Manzaneda 3, Pelayo, 11390, Algeciras, Cadiz, Spain aut García-Tiscar S. Department of Ecology, Universidad Autónoma de Madrid, Madrid, Spain aut Sinding M-H Centre for GeoGenetics, The Natural History Museum of Denmark, Øster Voldgade 5-7, 1350, Copenhagen, Denmark aut Verborgh P. CIRCE (Conservation, Information and Research on Cetaceans), Cabeza de Manzaneda 3, Pelayo, 11390, Algeciras, Cadiz, Spain aut acta ethologica Springer Berlin Heidelberg 18/1(2015-02-01), 69-78 0873-9749 18:1<69 2015 18 10211 https://doi.org/10.1007/s10211-014-0189-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10211-014-0189-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- De Stephanis R. Grupo de Ecología Marina Aplicada (GEMA), Estación Biológica de Doñana (CSIC), C/Americo Vespucio, s/n, 41092, Sevilla, Isla de la Cartuja, Spain aut NATIONALLICENCE 700 1- Giménez J. Grupo de Ecología Marina Aplicada (GEMA), Estación Biológica de Doñana (CSIC), C/Americo Vespucio, s/n, 41092, Sevilla, Isla de la Cartuja, Spain aut NATIONALLICENCE 700 1- Esteban R. CIRCE (Conservation, Information and Research on Cetaceans), Cabeza de Manzaneda 3, Pelayo, 11390, Algeciras, Cadiz, Spain aut NATIONALLICENCE 700 1- Gauffier P. CIRCE (Conservation, Information and Research on Cetaceans), Cabeza de Manzaneda 3, Pelayo, 11390, Algeciras, Cadiz, Spain aut NATIONALLICENCE 700 1- García-Tiscar S. Department of Ecology, Universidad Autónoma de Madrid, Madrid, Spain aut NATIONALLICENCE 700 1- Sinding M-H Centre for GeoGenetics, The Natural History Museum of Denmark, Øster Voldgade 5-7, 1350, Copenhagen, Denmark aut NATIONALLICENCE 700 1- Verborgh P. CIRCE (Conservation, Information and Research on Cetaceans), Cabeza de Manzaneda 3, Pelayo, 11390, Algeciras, Cadiz, Spain aut NATIONALLICENCE 773 0- acta ethologica Springer Berlin Heidelberg 18/1(2015-02-01), 69-78 0873-9749 18:1<69 2015 18 10211