1 Enigmatic declines of Australia’s sea snakes from a biodiversity hotspot. 2 3 Vimoksalehi Lukoschek*1, Maria Beger2, Daniela Ceccarelli3, Zoe Richards4, Morgan Pratchett1 4 1Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University, 5 Townsville, QLD, 4811, Australia 6 2Australian Research Council Centre of Excellence for Environmental Decisions, School of 7 Biological Sciences, The University of Queensland, St Lucia, QLD 4072, Australia 8 3Marine Ecology Consultant, P.O. Box 215, Magnetic Island QLD 4819, Australia 9 4Aquatic Zoology, Western Australian Museum, 49 Kew Street, Welshpool, WA, 6105 10 11 *Corresponding Author: 12 Australian Research Council Centre of Excellence for Coral Reef Studies, 13 Room 120, DB032 14 James Cook University 15 Townsville, QLD, 4811, Australia 16 Email:
[email protected] 17 Phone: +61-7-47816294 18 19 20 Abstract 21 Declines in the abundance of marine vertebrates are of considerable concern, especially when they 22 occur in isolated locations relatively protected from most major anthropogenic disturbances. This 23 paper reports on sustained declines in the abundance and diversity of sea snakes at Ashmore Reef, a 24 renowned biodiversity hotspot in Australia’s Timor Sea. Surveys conducted in eight years between 25 1973 and 2010 recorded the highest abundances (average 42-46 snakes day-1) and species richness 26 (nine species) in 1973 and 1994. In 2002 abundance had declined by more than 50% (21 snakes 27 day-1) and only five species were recorded. Since 2005 abundances have been consistently low (1-7 28 snakes day-1), with just two species, Aipysurus laevis and Emydocephalus annulatus, recorded in 29 significant numbers.