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Current expedition: DEEP CORAL DIVERSITY 2019.

Some of the Ocean’s most iconic and alien-looking species are found in the Bathyal zone, 800 to 3500 meters deep. Also known as the midnight zone, the Bathyal zone is the least well-known depth zone in the ocean, but contains much of the deep sea coral diversity. This species diversity is almost completely different between the Aleutians and Hawaii, with species transition occurring somewhere along the Emperor Seamount chain. Professor Les Watling and his team hypothesize that this boundary is determined by the flow of North Pacific Intermediate Water that comes from the Gulf of Alaska and the northwest coast of North America and crosses the Emperor Seamount chain at the Main Gap. This zonal water movement could function as a moderate to strong barrier to north-south species dispersal and may be responsible for the observed faunal differences. The team will sample seamounts on each side of the Emperor Seamount Chain Main Gap to differentiate the coral fauna and the water conditions where the corals live.

In the North Pacific there is only one range of seamounts between the Aleutian Islands and the Hawaiian Island chain that harbors bathyal species: the Emperor Seamount Chain. The North Pacific Intermediate Water crosses the chain at what is known as the Main Gap. This location will help the multidisciplinary team of scientists on Falkor identify this ecosystem transition. Up until now, most of the bathymetric surveys conducted in this area have been the result of transits, therefore lacking quality coverage necessary to pinpoint precise locations of study. This is why Falkor’s first task will be mapping the geologic features of the selected seamounts.

In addition to the ROV work, Falkor’s CTD rosette will be used to identify an assorted mix of water masses that affect the types of organisms found at specific locations. Dr. Watling’s team believes that there are three water masses dominating the water column in the area with distinct geochemical signatures.

Seamounts are fascinating features of our oceans and taking a closer look at them is always extraordinary. The team is hoping to better understand the distribution of octocoral species on each side of the Main Gap, as well as investigate the processes that influence these distributions. They will first produce detailed maps of the seamounts visited; these will be used to determine optimal dive locations for ROV SuBastian to collect octocoral samples for taxonomic and molecular analyses. Water samples will be collected to better understand the origin and characteristics of the environment in which the corals reside.

Read more about the research and keep up with its blogs here.

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