| Cetaceans
consist of all whales, dolphins and porpoises and are divided into
toothed whales (odontocetes) and baleen whales (mysticetes). In the
research area of Cetacealab we are fortunate to be in the company of
both. The orca is a member of the toothed whale suborder and is the
largest member of the dolphin family. The humpback whale is a baleen
whale. It is the acoustic nature of both that is the true essence
of our research.
For
this reason in conjunction with the research facility we have set up
a network of hydrophone stations in strategic locations ranging from
3 to 10 km from Cetacealab. Each hydrophone has been placed 60-80 feet
underwater, connected via cable to a land- based transmitter. The
radio transmitter will broadcast all whale vocalizations back to Cetacealab.
All stations are powered with solar panels and 12 volt batteries. We
monitor these underwater sounds continuously
in the lab, day and night, all year round. When calls are heard we then
begin to record directly onto our computer. From these recordings we
can monitor the movement patterns of different Orca populations and Humpback
Whales. This method of research is ideal, as we are no longer dependent
on weather conditions or daylight. More important, we are able to collect
all acoustic information without having an impact on the whales. At present
this hydrophone network enables us to listen to an underwater area of
25sq.km. We would like to increase this coverage further to determine
how important this particular core habitat is to their continued existence.
Of great significance to us, in the fall of 2004 we recorded our first
humpback whale song. This song went on for over 30 minutes. For the
next 2 months we recorded over 30 hours of humpback whales "singing".
For years is has been assumed that humpback whales only sing once they
have migrated south to warmer waters. With our hydrophone network we
now know they begin this "singing" behavior in the early months of
fall in northern waters. We will begin to compare these songs with
the "song" they
will sing later in the season in either Hawaii or Mexico. We hope to
determine the purpose of this "song display" in northern waters. Please
refer to our Humpback page for more information.

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