hyperspectral and physiological analyses of coral-algal interactions高光谱和珊瑚藻的生理分析交互.pdfVIP

Hyperspectral and Physiological Analyses of Coral-Algal Interactions 1 2 1 1 2 1 Katie Barott *, Jennifer Smith , Elizabeth Dinsdale , Mark Hatay , Stuart Sandin , Forest Rohwer 1 Department of Biology, San Diego State University, San Diego, California, United States of America, 2 Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, United States of America Abstract Space limitation leads to competition between benthic, sessile organisms on coral reefs. As a primary example, reef-building corals are in direct contact with each other and many different species and functional groups of algae. Here we characterize interactions between three coral genera and three algal functional groups using a combination of hyperspectral imaging and oxygen microprofiling. We also performed in situ interaction transects to quantify the relative occurrence of these interaction on coral reefs. These studies were conducted in the Southern Line Islands, home to some of the most remote and near-pristine reefs in the world. Our goal was to determine if different types of coral-coral and coral-algal interactions were characterized by unique fine-scale physiological signatures. This is the first report using hyperspectral imaging for characterization of marine benthic organisms at the micron scale and proved to be a valuable tool for discriminating among different photosynthetic organisms. Consistent patterns emerged in physiology across different types of competitive interactions. In cases where corals were in direct contact with turf or macroalgae, there was a zone of hypoxia and altered pigmentation on the coral. In contrast, interaction zones betwee