Ship strikes and entanglement in fishing gear are threatening the survival of the North Atlantic right whale, one of the most endangered whales with an estimated population of about 350. With eight recorded deaths in the past 16 months and a population growth rate that has declined since 1980, scientists say that unless emergency management actions are taken the population will face a catastrophic decline and become extinct.

A report in the July 22 issue of the journal Science says the recent loss of eight whales, six of them adult females and three carrying near-term fetuses, is unprecedented in 25 years of study of this species, Eubalaena glacialis. Four of the females were beginning to bear calves, and since the average lifetime calf production is as high as five calves, the deaths of these females represents a reproductive loss of as many as 21 animals.

After almost 1,000 years of whaling that brought the species close to extinction in the early 20th century, the North Atlantic right whale has been protected from commercial whaling since 1935 but has faced constant threats from human activities, mainly collisions with ships and entanglement in fishing gear. In contrast, southern right whales, Eubalaena australis, are thriving, with a population estimated at more than 10,000 animals and growing at more than seven percent each year.

According to the recent study, led by Scott Kraus of the New England Aquarium, 50 right whales have been reported dead since 1986, at least half of them from human activities. At least 19 were killed by vessel collisions and at least six by entanglement in fishing gear. In addition, there were 61 confirmed reports of whales carrying fish gear, with about half of those whales able to shed the gear or were disentangled by humans.

Study co-authors Hal Caswell and Michael Moore of the Woods Hole Oceanographic Institution (WHOI) emphasize the consequences for the population. "The bottom line is that human
'"/>

Contact: Shelley Dawicki
sdawicki@whoi.edu
508-289-2270
Woods Hole Oceanographic Institution
25-Jul-2005

Page: 1 2 3
Related biology news :

1. Endangered shortnose sturgeon saved in Hudson River
2. Endangered Species Act provisions appear to benefit imperiled organisms
3. Endangered frogs coexist with fungus once thought fatal
4. Changing climate will challenge Northeast agriculture, CU expert warns
5. Northern forests less effective than tropical forests in reducing global warming
6. Genomatix expands operations in North America
7. Overfishing great sharks wiped out North Carolina bay scallop fishery
8. Iowa State University botanists identify new species of North American bamboo
9. Climate changes, Cod collapse have altered North Atlantic ecosystems
10. Altered ocean currents disturb ecosystem off Northern California and Oregon coast
11. Hotspots of mercury contamination identified in eastern North America