North Carolina Museum of Natural Sciences Life on the Edge: Exploring Deep Ocean Habitats - NC Museum of Natural Sciences Website
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2005 Questions & Answers

10/18/05

Dave, a teacher from Michigan, sent the following:

From your map it appears your sample sites are between 400 m and 800 m in depth. Does depth play a significant role in selecting your sites and if so, why such a range of depths?
Depth does play a significant role in determining our dive sites because the corals we are targeting (Lophelia) only occur in the deeper depths (between 300Ė900 meters). Although we know the coral is out here, there are not many maps identifying the location of these coral mounds. We use the shipís sonar to help select target submersible sites.

Where does the Gulf Stream generally travel relative to your sampling sites?
Generally the Gulf Stream moves from south to north over our sites. When we launch the sub we have to consider the force of the Gulf Stream on the descent of the sub. It is a good geometry problem to determine where to launch the sub so that its angle of descent will make it land at its target site.

Shay, a sixth grader from Alaska asks:

What is your boat like?
Our boat, the R/V Seward Johnson, is 210 feet long. It is a research vessel which means most of its deck is used to hold science equipment. The four-person submersible (Johnson-Sea-Link) sits on the deck and is our primary means of collecting specimens. We have both a dry lab (for the computers) and a wet lab (for processing the specimens). There is an environmental room, which is kept cold so that we can keep some specimens alive for observations. In addition to the submersible we use otter trawls, Neuston nets, dip nets, and plankton nets to collect specimens.

Technical information about R/V Seward Johnson can be found on the Harbor Branch Oceanographic Institution's website.

Do you have any pictures of seagrapes?
Unfortunately we donít have any pictures of seagrapes. They are found in shallow water and we are in deep water.

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