The recent north winds blew out the fog and then calmed down nicely this morning, giving us our first good weather window in two weeks. Excited to be out on the water again, we awoke at 4:15 this morning to check the weather, put on lots of layers, ate breakfast and loaded the boat with equipment. By 5:30 we were off the dock and headed out to find the whales!

We went to the eastern part of the Bay as we had heard that whales were recently seen there. After a few hours of surveying we found our first whale and quickly began to see others. As we photographed each whale, we would head over to photograph the next one that surfaced and soon found ourselves so far east that we were sitting in the middle of the outbound shipping lane! Keeping a keen eye out for ships (although we didn't see any all day) so we could be quick to move out of their way, we photographed four mother and calf pairs and six other individuals. Four of these individuals were involved in a surface active group (SAG).

We photographed the whales as they energetically rolled and twisted around each other. The female in the SAG was a well known whale named Morse (go to the right whale catalog and search for #1608). Morse was born in 1986 and was given her name because a few white scars on her head reminded researchers of Morse code. After a good day with the whales, it will be a quite night at the "Whale house" as we all head to bed early in hopes that we will be woken by a subtle knock and the words "we're good to go."


We were able to get out on the water today for a brief window. Here is some footage of researchers Yan, Dan, Cyndi, Monica and Erin Burke (Massachusetts Division of Marine Fisheries) hard at work documenting a mother and calf pair. The mom's name is Arpeggio (go to the right whale catalog and search for #2753). Listen and look closely and you will hear the sounds of camera shutters clicking as researcher describe the scene and see the distinctive propeller scar on the right flank of Arpeggio.

Photo of Morse (EG #1608) taken by Erin Burke.
Video of Arpeggio (EG #2753) and her calf taken by Jonathan Cunha.

- Cyndi/Jonathan

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Labels: Cyndi, Jonathan, mother and calf pairs, Right Whales, SAG

One of the terms we frequently use when describing right whale behavior is surface active group (SAG). A SAG has a fairly broad definition--two or more whales within a body length interacting at the surface--but typically, the SAG is comprised of one female and a number of males competing with each other in order to mate with her. Some SAGs are extremely active, with a lot of rolling and white water, whereas others are more sedate. The number of animals in a SAG can range from two or three to more than 40!

For years researchers presumed that the primary reason for a SAG was mating. However, conception is thought to take place in the winter (since gestation is about 12 months and right whales usually give birth between December and February), yet SAGs occur year round. Recent analyses of the composition and seasonality of these SAGs indicate that actually only about half of them include females able to reproduce. Thus, SAGs are not just for mating purposes.

Some have been documented to be all male, or all female, or all youngsters. Our colleague, Dr. Susan Parks from Woods Hole Oceanographic Institution, wrote a paper about SAG behavior in collaboration with Aquarium researchers (see below). She hypothesizes that, in addition to conception, SAGs may serve a variety of different roles including practice, play and social bonding.

Studying the behavior of marine mammals such as right whales is much more difficult than that of terrestrial species, because we get just a glimpse of these animals when they're at the water's surface. But the long-term photo-identification aspect of the Aquarium's program has enabled researchers to answer some very basic and important questions. To see video of a SAG see entry #11 Behavior Video (SAG).

Top photo: Taken by Monica Zani in the Southeast U.S.
Bottom photo: A typically boisterous SAG in the Bay of Fundy. Photo taken by Moira Brown

Parks, S. E. et al. 2007. Occurrence, Composition, And Potential Functions Of North Atlantic Right Whale (Eubalaena glacialis) Surface Active Groups. Marine Mammal Science 23(4): 868-887.

Marilyn

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Labels: Behaviors, Marilyn, Right Whales, SAG

Surface Active Group



This is a video of a Surface Active Group (SAG) of North Atlantic Right Whales in the Bay of Fundy. Stay tuned for more information about right whale behaviors!

Jonathan

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Labels: Bay of Fundy, Jonathan, Right Whales, SAG