Time filter

Source Type

Senigaglia V.,University of Aberdeen | de Stephanis R.,CSIC - Doñana Biological Station | Verborgh P.,Circe Conservation Information And Research On Cetaceans | Lusseau D.,University of Aberdeen
Behavioural Processes | Year: 2012

Synchronized swimming in cetaceans has been hypothesized to play a role in affiliative processes as well as anti-predatory responses. We compared observed variation in synchronized swimming at two research sites in relation to disturbance exposure to test these two hypotheses. This study describes and quantifies pair synchronization in long-finned pilot whales at the Strait of Gibraltar, Spain and Cape Breton, Canada. Synchronization differed depending on the behavioral state and the response is different in the two sites leading to the conclusion that environment can shape the occurrence and magnitude of certain behaviors. We also analyzed intra-population variations in synchronization among 4 social units of Pilot whales in the Strait of Gibraltar and the results of this study confirmed the affiliative role of synchronization and highlighted an influence of disturbance on synchronization. We can conclude that synchronization is a common behavior in long-finned pilot whales that allow for close proximity and rapid coordinated response of individuals, with the multiple functions of showing affiliation and reacting to disturbance. © 2012 Elsevier B.V.

Vilela R.,Wildlife Conservation Society | Pena U.,Wildlife Conservation Society | Esteban R.,CIRCE Conservation Information and Research on Cetaceans | Koemans R.,Repsol
Marine Pollution Bulletin | Year: 2016

A visual monitoring of marine mammals was carried out during a seismic acquisition survey performed in waters south of Portugal with the aim of assessing the likelihood of encountering Mysticeti species in this region as well as to determine the impact of the seismic activity upon encounter. Sightings and effort data were assembled with a range of environmental variables at different lags, and a Bayesian site-occupancy modeling approach was used to develop prediction maps and evaluate how species-specific habitat conditions evolved throughout the presence or not of seismic activity. No statistical evidence of a decrease in the sighting rates of Mysticeti by comparison to source activity was found. Indeed, it was found how Mysticeti distribution during the survey period was driven solely by environmental variables. Although further research is needed, possible explanations may include anthropogenic noise habituation and zone of seismic activity coincident with a naturally low density area. © 2016 Elsevier Ltd

Loading CIRCE Conservation Information and Research on Cetaceans collaborators
Loading CIRCE Conservation Information and Research on Cetaceans collaborators