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The chemoautotrophic bacteria and vesicomyid clams are the major fauna of the three cold seeps in Monterey Bay, California. The Mt Crushmore cold seep site is located in the vertically faulted and fractured region of the Purisima Formation, along the walls of Monterey Canyon. The Clam Field cold seep site is found near outcrops in the hydrocarbon-bearing Monterey Formation. The Clamp Flat site is located on the continental slope near 1,000 meter depth. Crabs, worms, clams, snails, limpets and several species of regional benthic fauna are also found at these seeps.

The blue marlin ( Makaira nigricans) is a highly migratory pelagic predator of tropical and subtropical seas. Information on the habitat use of marine species is fundamental to understanding their ecology and population dynamics and is needed to inform responsible management strategies. Using a long-term satellite tagging data set from The International Game Fish Association Great Marlin Race, we examined habitat use and how oxygen and temperature influence the horizontal and vertical distributions of blue marlin in the Central Pacific. Blue marlin primarily occurred in warm waters (26-30°C) and exhibited a diel bimodal depth distribution across the 5-year data record (2009-2013), with fish spending the majority of their time near the surface at night and at deeper depths during the day (25-100 m). The depth distribution of blue marlin was limited in areas where low oxygen and/or temperature conditions occur closer to the surface, with the extent of habitat compression being greatest when both oxygen and temperature were limiting. The migrations of blue marlin appeared restricted during the 2010 La Niña, when increased equatorial upwelling resulted in an extension of the cold, low oxygen waters of the cold tongue into the Central Pacific, creating a barrier to the trans-equatorial migrations that occurred during all other tagging years. If the frequency and intensity of La Niña events increases and the oxygen minimum layer continues to expand as has been predicted under certain climate change scenarios, the migratory behavior and habitat availability of blue marlin may be impacted. [ABSTRACT FROM AUTHOR]