Marine scientists monitor longest mammal migration

Apr 10, 2007

Marine scientists recently published a research paper in the science journal, Biology Letters, that found humpback whales migrate over 5,100 miles from Central America to their feeding grounds off Antarctica; a record distance undertaken by any mammal.

Kristin Rasmussen, a biologist with Cascadia Research Collective, and lead author in the study, finds the record-breaking migration interesting, but is most pleased that the study validates a long held assumption that humpback whales travel to warm water areas during the winter.

"It was very exciting because for years everyone said humpback whales could be found in warmer waters during the winter months, but this was the first time we were actually able to quantify this on a global scale, and relate it to these long distance migrations" said Rasmussen.

Researchers conducted the survey by identifying individual humpback whales on their wintering area off Central America, and then comparing these with whales identified on their feeding areas off Antarctica. Identification of individual whales is accomplished by comparing a unique set of markings on their fluke, like a "fingerprint," with a catalog of photographs held by the Antarctic Humpback Whale Catalog at the College of the Atlantic in Bar Harbor, Maine.

The scientists found some humpbacks traveling from Antarctica across the equator to as far north as Costa Rica to overwinter, a distance of approximately 8,300 kilometers or about 5,157 miles. The authors noticed that the presence of cold water along the equator coincided with the occurrence of this northerly wintering area, not only in the eastern Pacific, where the Central American whales were studied, but also in the eastern Atlantic, where another southern hemisphere humpback whale population can be found north of the equator during winter.

Daniel Palacios, an oceanographer working out of NOAA’s Southwest Fisheries Science Center laboratory in Pacific Grove, Calif., correlated sea-surface temperature with the whale migration by using data collected from satellites and distributed by the National Oceanographic Data Center.

"This study was possible thanks to the availability of reliable, high-resolution sea-surface temperature data collection that cover even the most remote regions of the globe," said Palacios.

Source: NOAA National Marine Fisheries Service

Explore further: Evolving to cope with climate change

add to favorites email to friend print save as pdf

Related Stories

Recommended for you

Evolving to cope with climate change

5 minutes ago

Over the next two centuries, climate change is likely to impact everything from industrial agriculture to the shape of our coastlines. The changing climate will certainly cause huge changes around the world, ...

The environmental impact of cats on native wildlife

1 hour ago

A team of researchers, led by Dr Wayne Linklater from the Centre for Biodiversity and Restoration Ecology at Victoria University of Wellington, recently surveyed veterinarians and cat owners to understand ...

Human and animal interaction identified in the viking age

1 hour ago

Since 2001, ancient DNA has been used in paleoparasitological studies to identify eggs found in soil samples from prehistoric periods, because identification cannot be done by morphological study alone. The species of human ...

Ringling elephants say goodbye to the circus

14 hours ago

Across America through the decades, children of all ages delighted in the arrival of the circus, with its retinue of clowns, acrobats and, most especially, elephants.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.