The Marine Mammal Institute's Whale Telemetry Group (WTG) has pioneered the development of satellite-monitored radio tags to study the movements, critical habitats, and dive characteristics of free-ranging whales and dolphins around the world. Since the first deployment of a satellite tag on a humpback whale off Newfoundland, Canada, in 1986, the WTG has tagged a total of 462 whales from 11 different species. This work has led to the discovery of previously unknown migration routes and seasonal distribution (wintering and summering areas), as well as descriptions of diving behavior.
The WTG primarily focuses on endangered whale species whose distribution, movements, and critical habitats (feeding, breeding, and migration areas) are unknown for much of the year. Decision makers use this valuable information to manage human activities that may jeopardize the recovery of endangered whale populations.
The objectives of the WTG’s telemetry studies are to: (1) identify whale migration routes; (2) identify specific feeding and breeding grounds, if unknown; (3) characterize local whale movements and dive habits in both feeding and breeding grounds, and during migration; (4) examine the relationships between whale movements/dive habits and prey distribution, time of day, geographic location, or physical and biological oceanographic conditions; (5) provide surfacing-rate information that can be useful in the development of more accurate abundance estimations, or assessing whales’ reactions to human disturbance; (6) characterize whale vocalizations; and (7) characterize sound pressure levels to which whales are exposed.
A new paper about Antarctic minke whales by MMI's Ari Friedlaender was published this week in the Journal of Experimental Biology. An article about the research in Science News highlights that this is the first time anyone has been able to tag the elusive whales, and that tagging is a nonlethal research method which is allowing scientists to uncover the minkes’ unique feeding behavior under the sea ice.
A new paper by Ladd Irvine and other MMI researchers finds that the favored feeding areas of endangered blue whales along the US West Coast are crossed by heavily used shipping lanes. The paper, which was published today in PLoS ONE, notes that moving the shipping lanes off Los Angeles and San Francisco slightly could significantly decrease the probability of ships striking the whales. The analysis is the most comprehensive study of blue whales' movements ever conducted.
Bruce Mate tagged his first whale 35 years ago using a primitive dart emitting a VHF signal that could be heard a whopping 5 miles away—if the weather wasn’t stormy that day. Fellow scientists thought he was a bit touched in the head for thinking a tag attached to a migrating whale would survive the saltwater pounding.