Cultural turnover among Galápagos sperm whales

Funding: Marine Alliance for Science and Technology for Scotland pooling initiative, which is funded by the Scottish Funding Council (#HR09011) and contributing institutions. While populations may wax and wane, it is rare for an entire population to be replaced by a completely different set of indiv...

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Bibliographic Details
Published in:Royal Society Open Science
Main Authors: Cantor, Mauricio, Whitehead, Hal, Gero, Shane, Rendell, Luke Edward
Other Authors: University of St Andrews. School of Biology, University of St Andrews. Centre for Social Learning & Cognitive Evolution, University of St Andrews. Sea Mammal Research Unit, University of St Andrews. Marine Alliance for Science & Technology Scotland, University of St Andrews. Bioacoustics group, University of St Andrews. Centre for Biological Diversity
Format: Article in Journal/Newspaper
Language:English
Published: 2016
Subjects:
Culture
Dialect
Physeter macrocephalus
Population ecology
Demographic change
Social structure
GC Oceanography
QH301 Biology
QL Zoology
GC
QH301
QL
Pacific
Sperm whale
Online Access:http://hdl.handle.net/10023/9699
https://doi.org/10.1098/rsos.160615
http://rsos.royalsocietypublishing.org/content/3/10/160615
Description
Summary:Funding: Marine Alliance for Science and Technology for Scotland pooling initiative, which is funded by the Scottish Funding Council (#HR09011) and contributing institutions. While populations may wax and wane, it is rare for an entire population to be replaced by a completely different set of individuals. We document the large-scale relocation of cultural groups of sperm whale off the Galápagos Islands, in which two sympatric vocal clans were entirely replaced by two different ones. Between 1985 and 1999, whales from two clans (called Regular and Plus-One) defined by cultural dialects in coda vocalizations were repeatedly photo-identified off Galápagos. Their occurrence in the area declined through the 1990s; by 2000, none remained. We reassessed Galápagos sperm whales in 2013–2014, identifying 463 new females. However, re-sighting rates were low, with no matches with the Galápagos 1985–1999 population, suggesting an eastward shift to coastal areas. Their vocal repertoires matched those of two other clans (called Short and Four-Plus) found across the Pacific but previously rare or absent around Galápagos. The mechanisms behind this cultural turnover may include large-scale environmental regime shifts favouring clan-specific foraging strategies, and a response to heavy whaling in the region involving redistribution of surviving whales into high-quality habitats. The fall and rise of sperm whale cultures off Galápagos reflect the structuring of the Pacific population into large, enduring clans with dynamic ranges. Long-lasting clan membership illustrates how culture can be bound up in the structure and dynamics of animal populations and so how tracking cultural traits can reveal large-scale population shifts. Publisher PDF Peer reviewed

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