Sea Technology

DEC 2018

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40 ST | December 2018 www.sea-technology.com Molluscs Unaffected by PETM Climate Change The impact of global warming on shallow marine life approximately 56 million years ago is the subject of a new paper by researchers at Syracuse University. This research is the first to address the effects of the Paleocene-Eocene Thermal Maxi- mum (PETM)—a relatively brief pe- riod of global climate change, span- ning 200,000 years—on marine invertebrates, including molluscs. Invertebrates now account for more than 98 percent of all animal life. The research found that any po- tential selection pressure imparted by global warming was weak, tax- on-specific, short-lived and ulti- mately inconsequential to overall molluscan evolutionary history. Their adaption to the prevailing warm conditions at the time, cou- pled with the slow release of carbon dioxide relative to the time scale of ocean mixing, likely mollified the impact of global warming; a "best- case scenario." Coral Bleaching Can Increase Disease Risk Bleaching events caused by ris- ing water temperatures could in- crease mortality among staghorn coral, already threatened by dis- ease, says new research by Mote Marine Laboratory and Penn State. The study emphasizes the need for maintaining genetic diversity while increasing species resilience. Once prevalent throughout the Florida Reef Tract, staghorn coral has suffered substantial declines over decades due to increasing ocean temperatures and disease outbreaks. The Florida Reef Tract is estimated to be worth more than $6 billion to the state economy. Eco- system services will be lost if the living coral is not restored. eDNA Potential Tool For Beach Safety A collaboration between re- searchers from UC Santa Barbara and the U.S. Geological Survey, with colleagues from California State University Long Beach and Central Michigan University, will enable detection of the presence of white sharks in beaches through de- velopments in environmental DNA (eDNA). Scientists can extract and amplify specific genes in the DNA fragments found in water samples and determine if the DNA is from a specific species. "One of the goals of this research is for a lifeguard to be able to walk down to the shore, scoop up some water, shake it and see if white sharks are around," said researcher Kevin Lafferty. White sharks had been declining due to overfishing but have late- ly been experiencing a comeback along the California coast due to the success of state and federal pro- tections from fishing, recovery of marine mammal populations and ocean research NEW class of ROV Propulsion COPENHAGEN SUBSEA A/S sales@copenhagensubsea.com • www.copenhagensubsea.com Powerful and silent subsea thrusters from Copenhagen Subsea A/S have been developed with reliability as the highest design priority. The ROV thrusters are responsive, powerful and easy to integrate – and will provide vehicles with a unique combination of silent power and high maneuverability.

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