First Record of a Collapsed Dorsal Fin in a White-beaked Dolphin Lagenorhynchus albirostris, with a Gunshot Wound as a Possible Cause

Collapsed dorsal fins are rare in odontocete cetaceans, having been reported for only a few species. We present the first known case in a White-beaked Dolphin (Lagenorhynchus albirostris Gray, 1846), photographed off northern Newfoundland, Canada in September 2004. The animal also had a wound on the right side of its body, anterior to the dorsal fin, with an estimated average diameter of 20-37 mm. We consider this to be a gunshot wound, most likely a 12-gauge rifled slug. The dolphin appeared to be healthy and with no movement problems, and what was apparently the same animal was seen in the same area on several dates during 2005. There is a long history of hunting small cetaceans off the Labrador coast, and a gunshot wound is the most likely cause of the wound observed. The wound may have caused the dorsal fin to collapse, as noted in other dolphin species

Attitudes of Nunavut Inuit toward Killer Whales (Orcinus orca)

Killer whale (Orcinus orca) sightings are increasing throughout the eastern Canadian Arctic, and residents of Nunavut are concerned about the possible impact of killer whale predation on other marine mammals that are of socio-economic and cultural importance to Inuit. We analyzed the attitudes of Inuit towards killer whales, drawing on 105 semi-directed interviews conducted in 11 eastern Nunavut communities (Kivalliq and Qikiqtaaluk regions) between 2007 and 2010. Information gathered included interviewees’ firsthand knowledge, as well as knowledge they had gained through oral history. Interviews provided data on interactions between Inuit and killer whales, physical descriptions and nature of killer whales in this region, overall opinion of interviewees with respect to killer whales, historical use of the animal, opinions regarding research on killer whales and effects of killer whales on other species, particularly the whales and seals harvested for Inuit subsistence. Interviewees described killer whales as their helpers more often than as their competitors, but also as feared and dangerous. Overall, negative opinions were more common than positive opinions, and some interviewees also had a conflicted attitude towards killer whales. More participants viewed killer whales as smart and fast than as beautiful and playful. Inuit attitudes toward killer whales did not vary significantly with sex, age, hunter status, or experience with killer whales, but did vary somewhat across regions. Inuit knowledge and perspectives play a critical role in wildlife management, especially in a changing Arctic. Conservation and management of species that are important to the Inuit subsistence harvest in Nunavut must take into consideration killer whale predation, Inuit knowledge, and Inuit views and attitudes towards killer whales.Les observations d’épaulards (Orcinus orca) augmentent dans l’est de l’Arctique canadien, et les habitants du Nunavut s’inquiètent des effets possibles de la prédation des épaulards à l’égard d’autres mammifères marins qui revêtent une importance socioéconomique et culturelle pour les Inuits. Nous avons analysé les attitudes des Inuits vis-à-vis des épaulards, nous appuyant ainsi sur 105 entrevues semi-dirigées réalisées dans 11 collectivités de l’est du Nunavut (les régions de Kivalliq et de Qikiqtaaluk) entre 2007 et 2010. Les connaissances directes des personnes interviewées font partie des renseignements qui ont été recueillis, de même que les connaissances obtenues par le biais de l’histoire orale. Les entrevues ont ainsi permis d’obtenir des données sur les interactions entre les Inuits et les épaulards, sur les descriptions physiques et sur la nature des épaulards de cette région, en plus de recueillir l’opinion générale des personnes interviewées au sujet des épaulards, l’utilisation historique de cet animal, les opinions en matière de recherche sur les épaulards et les effets des épaulards sur d’autres espèces, plus particulièrement les baleines et les phoques capturés pour la subsistance des Inuits. Selon les personnes interviewées, les épaulards leur viennent davantage en aide au lieu d’entrer en concurrence avec elles, mais cela dit, elles les craignent et les trouvent dangereux. Dans l’ensemble, il y avait plus d’opinions négatives que d’opinions positives, et certaines personnes interviewées avaient même une attitude conflictuelle à l’égard des épaulards. Plus nombreux étaient les participants qui considéraient les épaulards comme intelligents et rapides que comme beaux et enjoués. Les attitudes des Inuits envers les épaulards ne variaient pas beaucoup en fonction du sexe, de l’âge, du type de chasseur ou de l’expérience qu’ils possédaient avec les épaulards, mais ils variaient quelque peu d’une région à l’autre. Les connaissances et les perspectives des Inuits jouent un rôle critique dans la gestion de la faune, surtout dans l’Arctique en pleine évolution. La conservation et la gestion des espèces qui revêtent de l’importance dans les récoltes de subsistance des Inuits au Nunavut doivent tenir compte de la prédation par les épaulards, des connaissances des Inuits de même que des points de vue et des attitudes des Inuits vis-à-vis des épaulards

Phylogeny and divergence of the pinnipeds (Carnivora: Mammalia) assessed using a multigene dataset

Abstract Background Phylogenetic comparative methods are often improved by complete phylogenies with meaningful branch lengths (e.g., divergence dates). This study presents a dated molecular supertree for all 34 world pinniped species derived from a weighted matrix representation with parsimony (MRP) supertree analysis of 50 gene trees, each determined under a maximum likelihood (ML) framework. Divergence times were determined by mapping the same sequence data (plus two additional genes) on to the supertree topology and calibrating the ML branch lengths against a range of fossil calibrations. We assessed the sensitivity of our supertree topology in two ways: 1) a second supertree with all mtDNA genes combined into a single source tree, and 2) likelihood-based supermatrix analyses. Divergence dates were also calculated using a Bayesian relaxed molecular clock with rate autocorrelation to test the sensitivity of our supertree results further. Results The resulting phylogenies all agreed broadly with recent molecular studies, in particular supporting the monophyly of Phocidae, Otariidae, and the two phocid subfamilies, as well as an Odobenidae + Otariidae sister relationship; areas of disagreement were limited to four more poorly supported regions. Neither the supertree nor supermatrix analyses supported the monophyly of the two traditional otariid subfamilies, supporting suggestions for the need for taxonomic revision in this group. Phocid relationships were similar to other recent studies and deeper branches were generally well-resolved. Halichoerus grypus was nested within a paraphyletic Pusa, although relationships within Phocina tend to be poorly supported. Divergence date estimates for the supertree were in good agreement with other studies and the available fossil record; however, the Bayesian relaxed molecular clock divergence date estimates were significantly older. Conclusion Our results join other recent studies and highlight the need for a re-evaluation of pinniped taxonomy, especially as regards the subfamilial classification of otariids and the generic nomenclature of Phocina. Even with the recent publication of new sequence data, the available genetic sequence information for several species, particularly those in Arctocephalus, remains very limited, especially for nuclear markers. However, resolution of parts of the tree will probably remain difficult, even with additional data, due to apparent rapid radiations. Our study addresses the lack of a recent pinniped phylogeny that includes all species and robust divergence dates for all nodes, and will therefore prove indispensable to comparative and macroevolutionary studies of this group of carnivores.</p

Killer whale (Orcinus orca) photo-identification in the eastern Canadian Arctic

We identified individual killer whales (Orcinus orca) using recent (2004-09) photographs to obtain a minimum count of whales that use eastern Canadian Arctic waters. Fifty-three individuals were identified from nine different sightings; 11 individuals from western Hudson Bay sightings and 42 from the areas around northern and eastern Baffin Island. One whale was resighted: an adult female or large juvenile photographed 17 days and 375 km apart at Churchill, Manitoba, and off-shore of Rankin Inlet, Nunavut, in August 2007. With only one individual re-sighted, the number of individuals that use this area is likely much larger. No re-sightings occurred between Arctic killer whales and individuals photographed off the coast of Newfoundland. Our results represent the minimum number of killer whales sighted in eastern Canadian Arctic waters and provide the foundation for further killer whale research. Little is known about Arctic killer whales and, as a top predator, it is unclear what effect they have on Arctic marine ecosystems.Keywords: Abundance; Baffin Island; Canada; distribution; High Arctic; Hudson Bay; photographs(Published: 23 May 2011)Citation: Polar Research 2011, 30, 7203, DOI: 10.3402/polar.v30i0.720