Tuesday,
May 24, 2005
Hello again from Gray’s Reef
Today
was a day of full-fledged science. We got an early start on
the day with the first dive team leaving the ship at 8:00a.m.
The currents today were not as strong as they were on Monday
and the first dive team did not have a problem getting down
to the bottom. In the first group Rob Ruzicka and Danny Gleason
collected some tunicates and bryozoans so that they could have
them for the database that they are trying to compile. This
database will soon be placed on a website so that scientists
and the general public will be able to go and look at photographs
and information about the benthic invertebrates at Gray’s
Reef. The plan is to compile a key that can be used to identify
invertebrates of Gray’s Reef. Leslie Bates was also in
the first dive group. She tried to determine a good place to
conduct her experiment, which is to test whether or not there
is a correlation between the amount of predation on sponges
and the sponges’ chemical defenses.
Chris
Freeman and Patrick Erwin were in the second dive team, and
dove to collect sea urchins and sea stars to put in the aquarium
tanks that are aboard the Foster so that these animals could
be tested by using food cubes with sponge extracts in them to
determine whether or not the sea stars and sea urchins (Phylum
Echinodermata) will eat these food sources. This research will
help to determine some of the major predators on sponges within
Gray’s Reef. Lauren Wagner collected some sea cucumbers,
another group within Phylum Echinodermata for the data base.
The next set of dives took place at J-Reef
which is just outside Gray’s Reef. The second dive for
both teams went well despite having some difficulties with the
dive boat. Rob was able to set up his sample locations for the
testing of effects of predation on sponge distribution by building
cages around certain locations within the reef so that he could
exclude the sponge’s predators. He also set up a site
in which there were no cages as a control for the experiment.
The rest of the divers for both teams concentrated on the specimen
collections, consisting of photographing the organisms in their
natural environment, then collecting specimens in jars and in
bags. Once on the surface, the specimens are photographed again,
identified, and added to the data base.
Tomorrow we will be back in Gray’s
Reef.
So until then,
Ryan Yaden
|