A Global Crisis for Seagrass Ecosystems...alue of seagrass meadows. ... seagrass, decline, sentinels, ecological services, monitoring ... Tim Carruthers ... Bill Dennison ... Orth RJ, Carruthers TJB, Dennison WC, Duarte CM, Fourqurean JW, Heck KL Jr, Hughes AR, Kendrick GA, Kenworthy WJ, O...