RT info:eu-repo/semantics/article
T1 Deep-diving beaked whales dive together but forage apart.
A1 Alcázar Treviño, Jesús
A1 Johnson, Mark
A1 Arranz, Patricia
A1 Warren, Victoria E.
A1 Pérez-González, Carlos J.
A1 Marques, Tiago
A1 Madsen, Peter T.
A1 Aguilar de Soto, Natacha
K1 beaked whales
AB Echolocating animals that forage in social groups can potentially benefit from eavesdropping on other group members, cooperative foraging or social defence, but may also face problems of acoustic interference andintra-group competition for prey. Here, we investigate these potential trade-offs of sociality for extreme deep-diving Blainvilles and Cuvier’s beaked whales. These species perform highly synchronous group dives as a presumed predator-avoidance behaviour, but the benefits and costs of this on foraging have not been investigated. We show that group members could hear their companions for a median of at least 91% of the vocal foraging phase of their dives. This enables whales to coordinate their mean travel direction despite differing individual headings as they pursue prey on a minute-by-minute basis. While beaked whales coordinate their echolocation-based foraging periods tightly, individual click and buzz rates are both independent of the number of whales in the group. Thus, their foraging performance is not affected by intra-group competition or interference from group members, and they do not seem to capitalize directly on avesdropping on the echoes produced by the echolocation clicks of their companions. We conclude that the close diving and vocal synchronization of beaked whale groups that quantitatively reduces predation risk has little impact on foraging performance.
YR 2020
FD 2020
LK http://riull.ull.es/xmlui/handle/915/34698
UL http://riull.ull.es/xmlui/handle/915/34698
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 15-may-2024