Madeira's pilot whales were residents and travelers at the same time
WHAT THE EVIDENCE SAYS
Sixteen tagged short-finned pilot whales tracked between 2018 and 2024 cumulatively crossed a region of 1.17 million square kilometres, yet stayed near Madeira for a mean consecutive 53 days. State modelling linked area-restricted searching to shallow mixed layers and travel to deeper mixing; photo-identification confirmed mixed island-fidelity classes.
WHY IT MATTERS / OUR READ
Island waters can be valuable seasonal habitat without enclosing a population's range. Marine management should account for time-varying aggregation, dynamic ocean layers and movements across fixed jurisdictional boundaries.
CAVEATS / UNCERTAINTY
Only sixteen tags, uneven observation periods and environmental associations; not proof of oceanographic causation or protection effectiveness.
SOURCE
Movement Ecology — pilot whale telemetry study (2026)
View original evidence ↗
Ocean structure helped distinguish seasonal aggregation near an island from Atlantic travel.
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