Study finds albatrosses fine-tuned to wind conditions

Study finds albatrosses fine-tuned to wind conditions
A male and female wandering albatross in courtship display. Males are 20% larger than females, which is reflected in their flight performance. Credit: Samantha Patrick

A new study of albatrosses has found that wind plays a bigger role in their decision to take flight than previously thought, and due to their differences in body size, males and females differ in their response to wind.

With a wingspan of over three meters —the largest of any bird alive today— the wandering albatross can fly thousands of miles, even around the world, gliding for long periods in search of fish or squid. Birds search for prey in flight and capture it after landing on the . Due to their long wings, taking off from the sea surface is by far their most energetically demanding activity, requiring four times more energy than gliding flight.

Now, a study by University of Liverpool scientists published in Journal of Animal Ecology, sheds new light on the previously neglected role of wind in the flight decisions of seabirds.

Using GPS loggers, researchers tracked the flight patterns of over 300 albatrosses from two major populations in the Southern Ocean, one of the windiest areas on the planet.

By combining tracking data with computer modelling, they found that the seabirds wait on the sea surface for winds to pick up before attempting to fly again. They also found that , which are 20% bigger than females, wait for stronger winds to help them take off from the and sustain their .

Liverpool University seabird ecologist and lead author of the study, Dr. Tommy Clay, said:

"Albatrosses are the oceans' great voyagers and are well-known for their ability to glide on winds with barely a flap of their wings.

Our study reveals that albatross behaviour is fine-tuned to the winds they encounter. In order to save energy, birds rely on strong winds for take-off, males more so than females.

Ongoing changes to wind patterns as a result of climate change may pose different risks to males and females. In recent years, increases in wind speeds have led to higher breeding success, but as winds become less predictable, birds may be unable to adapt."

Changing patterns around Antarctica have seen reductions in in more northerly areas, where are more likely to feed, and increases in southerly areas, where males are more common, which could affect how far they can travel to find food and their body condition.

These changes are more likely to benefit males. However, more research is needed to determine the long-term effects on populations.

The fieldwork was conducted over a seven year period in the remote sub-Antarctic islands of South Georgia in the south-west Atlantic Ocean and Crozet in the south-west Indian Ocean.

More information: Journal of Animal Ecology (2020). besjournals.onlinelibrary.wile … 1111/1365-2656.13267

Journal information: Journal of Animal Ecology

Citation: Study finds albatrosses fine-tuned to wind conditions (2020, June 18) retrieved 18 May 2024 from
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