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Artificial light disrupts the nearshore dispersal of neonate flatback turtles Natator depressus

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dc.contributor Pendoley Environm
dc.contributor Marine Sci Program
dc.contributor Australian Inst Marine Sci
dc.contributor Univ Western Australia M096
dc.contributor Australian Institute Of Marine Science
dc.contributor Indian Ocean Marine Res Ctr
dc.contributor University Of Western Australia
dc.contributor Univ Western Australia
dc.contributor Dept Biodivers Conservat & Attract
dc.contributor Uwa Oceans Inst
dc.contributor Oceans Grad Sch WHITING, SCOTT WILSON, PHILLIPA THUMS, MICHELE PATTIARATCHI, CHARITHA MEEKAN, MARK PENDOLEY, KELLIE FISHER, REBECCA 2018-08-26T18:45:44Z 2018-08-26T18:45:44Z 2019-07-08T02:21:01Z 2018-08-26T18:45:44Z 2018-08-26T18:45:44Z 2019-07-08T02:21:01Z 2018-07-30
dc.identifier.citation Wilson P, Thums M, Pattiaratchi C, Meekan M, Pendoley K, Fisher R, Whiting S (2018) Artificial light disrupts the nearshore dispersal of neonate flatback turtles Natator depressus. Marine Ecology Progress Series 600: 179-192
dc.identifier.issn 0171-8630
dc.description.abstract After emerging from nests, neonate sea turtles entering the water are thought to orientate away from shore using wave cues to guide them out to sea. Artificial light may interfere with this process, but the relative importance of natural and anthropogenic cues to the dispersal of hatchlings is unknown. Here, we used acoustic telemetry to track the movement of flatback turtle Natator depressus hatchlings dispersing through nearshore waters. Turtles dispersed in the presence and absence of artificial light through a receiver array where a range of oceanographic variables were measured. Turtle tracks were analysed using a full subsets generalised additive mixed model approach to identify the most important cues influencing the bearing, variance in bearing (a measure of the ability to orientate directly), rate of travel and time spent in the array. Artificial light reduced their swim speed by up to 30%, increased the amount of time spent in nearshore waters (by 50 to 150%) and increased the variance in bearing (100 to 180% more variable), regardless of oceanographic conditions. Under ambient conditions, ocean currents affected the bearing of hatchlings as they left the shore, but when light was present, this effect was diminished, showing turtles actively swam against currents in their attempts to move towards light. After accounting for the effects of currents on hatchlings dispersing under ambient conditions, turtles swam offshore by moving perpendicular to the coastline and did not appear to orient into incident wave direction. Overall, light disrupted the dispersal of hatchlings, causing them to linger, become disoriented in the nearshore and expend energy swimming against ocean currents.
dc.description.sponsorship Special thanks to the staff of Mackerel Island, Dennis Stanley and Dr Suzanne Long for their assistance in field experiments and to Dr Vinay Udyawer for providing R code for track animations. The Department of Biodiversity, Conservation and Attractions (formerly Department of Parks and Wildlife), the Australian Institute of Marine Science and the University of Western Australia provided financial support. All procedures were approved by the University of Western Australia Animal Ethics Committee (RA/3/100/1423) and Department of Biodiversity, Conservation and Attractions licenses SF010696.
dc.language English
dc.subject Vemco Positioning System
dc.subject Orientation Cues
dc.subject Hatchling Loggerhead Turtles
dc.subject Marine & Freshwater Biology
dc.subject Chelonia-mydas
dc.subject Offshore Migration
dc.subject Movement
dc.subject Multiple-regression
dc.subject Oceanography
dc.subject Light Pollution
dc.subject Acoustic Telemetry
dc.subject In-water Movement
dc.subject Ocean Currents
dc.subject Sea-finding Behavior
dc.subject Environmental Sciences & Ecology
dc.subject Hatchling
dc.subject Ecology
dc.subject Green
dc.subject Caretta-caretta L
dc.subject Pollution
dc.title Artificial light disrupts the nearshore dispersal of neonate flatback turtles Natator depressus
dc.type journal article
dc.identifier.doi 10.3354/meps12649
dc.identifier.wos WOS:000441331700014

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