Right Whale Migration Update: March 29, 2000
Today's Report Includes:
Greetings from the Stellwagen Bank National Marine Sanctuary.
I'm Anne Smrcina, the education coordinator of the sanctuary and your humpback whale correspondent. Not much has changed on the status of right whales up in the northern feeding ground of Cape Cod Bay. According to the National Marine Fisheries Service, from one to a dozen or more whales are being sighted on aerial and/or boat survey cruises. Aerial over-flights of the southern calving grounds have recorded few sightings this year. The word is still only one confirmed sighting of a mother-calf pair (much earlier in the season). It may be that other calves were born in other, non-patrolled areas, but researchers do not hold out much hope for any major changes in the numbers.
Radio-Tagged Whales -Tracking Right Whales From Shore
There is Nothing Simple in Animal Behavioral Studies
When scientists study animals they constantly ask questions and look for patterns in the animals' behavior. When patterns change, they study all the factors they can think of that might effect the changes. This year there seemed to be a tendency for the whales to show up in more northerly waters off the coasts of Georgia and South Carolina. They are also found to be somewhat further offshore. Scientists are not sure if these changes in habitat and the changes in the calving rate this season are just the sign of a single unusual year, or if they indicate a trend (there were only 4 calves last year).
How to Solve the Puzzle
One line of research is to look at whale positions and correlate this with sea surface temperatures using satellite images. Could it be that the surface waters are warming, leading to a shift in whale populations? Another way to look at this phenomenon is to ask whether the whales have used these more northern areas in the past, before there were scientific records. Could there have been unknown factors that caused the whales to move to the more southerly waters over the past few years?
Time to Focus on Cape Cod Bay
Now that the few whales in the southern grounds have departed, researchers will focus their attention on the group in Cape Cod Bay. They will take particular interest in making sure that boats are aware of their presence and that precautions are taken to avoid hitting them. Usually during the next couple of months the feeding forays range into the Great South Channel, a productive area of water between Cape Cod and Georges Bank (and also part of the major shipping channel from New York to Boston). Later in the summer the whales move on up to the Bay of Fundy and other areas off Nova Scotia.
This is Anne Smrcina, education coordinator of the Stellwagen Bank National Marine Sanctuary, signing off.
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The Next Right Whale Migration Update will Be Posted on April 12, 2000
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