10.1371/journal.pone.0012900.g005 Kyle S. Van Houtan Kyle S. Van Houtan Stacy K. Hargrove Stacy K. Hargrove George H. Balazs George H. Balazs Invasive macroalgae are chronically widespread in watersheds where disease rates and Nitrogen-footprint values are elevated. Public Library of Science 2010 macroalgae chronically watersheds rates nitrogen-footprint 2010-09-29 02:10:09 Figure https://plos.figshare.com/articles/figure/_Invasive_macroalgae_are_chronically_widespread_in_watersheds_where_disease_rates_and_Nitrogen_footprint_values_are_elevated_/497809 <p><i>A</i>, GWR predicted disease rates and Nitrogen-footprints grouped by island. Oahu points are clustered (87%, 48/55) in quadrants II and III, on Maui points are clustered in quadrants I and II (94%, 15/16), and Hawaii points are clustered in quadrant III (82%, 9/11). <i>B</i>, Disease and Nitrogen-footprints are elevated where macroalgae is chronic and widespread, seen as most points are in quadrant II (88%, 35/40). Green turtles now consume nonnative macroalgae which likely sequester environmental N as arginine. Arginine is known to regulate herpesviruses and contribute to tumor formation.</p>