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Groundbreaking study reveals oceanic seabirds chase tropical cyclones

July 9, 2024
in Marine
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Oceanic seabirds chase tropical cyclones
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A new study published today in Current Biology, “Oceanic Seabirds Chase Tropical Cyclones,” reveals that the rare Desertas Petrels (Pterodroma deserta), a wide-ranging seabird in the North Atlantic, exhibit unique foraging behaviors during hurricane season. Contrary to other pelagic seabirds, these petrels do not avoid intense tropical cyclones but instead exploit the dynamic conditions for their benefit, providing new insights into the impact of cyclones on open ocean marine life.

Oceanic seabirds chase tropical cyclones

Credit: © Kirk Zufelt

A new study published today in Current Biology, “Oceanic Seabirds Chase Tropical Cyclones,” reveals that the rare Desertas Petrels (Pterodroma deserta), a wide-ranging seabird in the North Atlantic, exhibit unique foraging behaviors during hurricane season. Contrary to other pelagic seabirds, these petrels do not avoid intense tropical cyclones but instead exploit the dynamic conditions for their benefit, providing new insights into the impact of cyclones on open ocean marine life.

“Initial studies suggested that seabirds either circumnavigate cyclones or seek refuge in the calm eye of the storm. However, the Desertas Petrels we tracked did neither; instead, one-third of them followed the cyclone for days, covering thousands of kilometers,” stated Francesco Ventura, lead author and a Postdoc Investigator in Biology at the Woods Hole Oceanographic Institution (WHOI). “When we saw the data, we nearly fell off our chairs. This is the first time we have observed this behavior.”

“It’s striking how well the birds know how to exploit the large-scale wind conditions over the North Atlantic for their travels,” said Caroline Ummenhofer, Associate Scientist, Physical Oceanography, at WHOI. “When you overlay the petrels’ foraging trips on top of average winds, it’s a very close match.”

The Desertas Petrels nest on the Bugio Island in Portugal, located off the western coast of North Africa. This island hosts the only known nesting colony of these pigeon-sized seabirds in the world, with fewer than 200 pairs residing on a plateau surrounded by steep cliffs. During their six-month breeding season, Desertas Petrels embark on extraordinary foraging journeys, often spending weeks at sea and flying roundtrips up to 7,500 miles across the Atlantic in search of food. They belong to the genus Pterodroma, which means “wings on the run.”

“We correlated the birds’ locations with intensifying storm conditions, including waves up to 8 meters high and wind speeds of 100 kilometers per hour,” said Ventura. “Upon encountering strong winds, the birds reduced ground speed, likely by spending less time in flight to avoid injury to their wings. In addition, the wakes of the storms provided predictably favorable wind conditions with higher tailwind support than alternative routes. Impressively, none of the birds we tracked were harmed by the storms and there was no incidence of nest desertion.”

The petrels pursue small fish, squid, and crustaceans that typically dwell at depths of 600 to 3,000 feet. Since they cannot dive to such depths, these seabirds have to wait until nightfall when their prey ascends closer to the surface.

“As we’ve now discovered, Desertas Petrels follow hurricanes where prey have accumulated closer to the surface in the wakes of the storms,” said Ummenhofer.

The study shows that cyclone wakes provided enhanced foraging conditions, with sharp drops in sea surface temperature and striking increases in surface chlorophyll. These changes suggest enhanced ocean mixing and productivity, which presumably increase prey abundance and accessibility for surface-feeding petrels.

“One of the interesting aspects of the interaction of a tropical cyclone and the ocean is the intense vertical mixing in the upper ocean layers caused by very strong winds and huge breaking seas,” said Philip Richardson, Emeritus, Physical Oceanography at WHOI and a co-author on the paper. “The cyclonic winds can cause a divergence in the upper layer that moves cooler, deeper water toward the surface.”

“The cyclones present a highly valuable foraging opportunity for Desertas Petrels because the storms churn up mesopelagic prey from deep within the vertical column, giving the seabirds an easy meal at the surface,” explained Ventura. “While storms are typically seen as destructive, particularly in coastal areas, our research reveals that functional perturbance driven by storms can create new opportunities. We’re advancing our understanding of how petrels navigate the open ocean to find food.”

“We now have a fresh perspective on hurricanes’ impact on marine ecosystems through the eyes of an apex predator,” said Ummenhofer. “This study provides valuable insights into the resilience and foraging strategies of pelagic seabirds in the face of extreme weather events.”

While cyclones are known to dramatically affect oceanic and coastal ecosystems, their impacts on pelagic marine life are poorly understood. This research reveals how higher predators like Desertas Petrels adapt their foraging strategies in the dynamic ocean environment and utilize cyclone-induced oceanographic changes to their advantage.

 

This research was made possible by the WHOI Postdoctoral Scholar Program with funding from the John E. Sawyer Fund and the John H. Steele Endowment and The Andrew W. Mellon Foundation Endowed Fund for Innovative Research at WHOI.

 

 

###

Authors:

Francesco Ventura, Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA

Neele Sander, Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA, USA, and Christian-Albrechts-Universität zu Kiel, Geomar Helmholtz-Center for Ocean Research, Kiel, Germany

Paulo Catry, Marine and Environmental Sciences Centre (MARE), Aquatic Research Network (ARNET), and Ispa Instituto Universitário, Lisbon, Portugal

Ewan Wakefield, Department of Geography, Durham University, Durham, UK

Federico De Pascalis, Area Avifauna Migratrice, Istituto Superiore per la Protezione e la Ricerca Ambientale (ISPRA), Ozzano dell’Emilia, Italy

Philip L. Richardson, Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA, USA

José Pedro Granadeiro, Centre for Environmental and Marine Studies (CESAM), Departmento de Biologia Animal, Universidade de Lisboa, Lisbon, Portugal

Mónica C. Silva, Centre for Ecology, Evolution and Environmental Changes (cE3c), Departmento de Biologia Animal, Universidade de Lisboa, Lisbon, Portugal

Caroline C. Ummenhofer,  Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA, USA

About Woods Hole Oceanographic Institution

The Woods Hole Oceanographic Institution (WHOI) is a private, non-profit organization on Cape Cod, Massachusetts, dedicated to marine research, engineering, and higher education. Established in 1930, its primary mission is to understand the ocean and its interaction with the Earth as a whole, and to communicate an understanding of the ocean’s role in the changing global environment. WHOI’s pioneering discoveries stem from an ideal combination of science and engineering—one that has made it one of the most trusted and technically advanced leaders in basic and applied ocean research and exploration anywhere. WHOI is known for its multidisciplinary approach, superior ship operations, and unparalleled deep-sea robotics capabilities. We play a leading role in ocean observation and operate the most extensive suite of data-gathering platforms in the world. Top scientists, engineers, and students collaborate on more than 800 concurrent projects worldwide—both above and below the waves—pushing the boundaries of knowledge and possibility. For more information, please visit www.whoi.edu

 



Journal

Current Biology

DOI

10.1016/j.cub.2024.06.022

Method of Research

Observational study

Subject of Research

Animals

Article Title

Oceanic seabirds chase tropical cyclones

Article Publication Date

9-Jul-2024

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