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ESR 41:265-277 (2020)  -  DOI:

Effects of a power plant closure on home ranges of green turtles in an urban foraging area

Tomoharu Eguchi1,*, Jessica Bredvik2, Suzanne Graham3, Robin LeRoux1, Brendan Saunders3, Jeffrey A. Seminoff1

1Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, La Jolla, CA 92037-1508, USA
2United States Navy, Naval Facilities Engineering Command Southwest, San Diego, CA 93132-5190, USA
3United States Navy, Naval information Warfare Center, San Diego, CA 92152-5001, USA
*Corresponding author:

ABSTRACT: A natural experiment was conducted to determine effects of a fossil-fueled power plant on home ranges of east Pacific green turtles Chelonia mydas in an urban foraging ground. The power plant, located in south San Diego Bay, California, USA, co-existed with a resident foraging aggregation of ~60 green turtles for ~50 yr. It was decommissioned during a long-term green turtle monitoring study, thus providing a rare opportunity to evaluate how the cessation of warm-water effluent affected turtle movements and habitat use in the area. During pre- and post-decommissioning of the power plant, 7 and 23 green turtles, respectively, were equipped with GPS-enabled satellite transmitters. Useful data were obtained from 17 turtles (4 for pre- and 13 for post-decommissioning). Core use areas (50% utilization distribution [UD]) increased from 0.71 to 1.37 km2 after the power plant decommissioning. Increase in post-power plant 50% UD was greater during nighttime (0.52 to 1.44 km2) than daytime (1.32 to 1.43 km2). Furthermore, UDs moved from the effluent channel to an area closer to seagrass pastures, a presumed foraging habitat of the turtles. The observed expansion of green turtle home ranges may increase turtle-human interactions, such as boat strikes, within the foraging ground; this underscores how seemingly innocuous human actions contribute to inadvertent consequences to wildlife. Possible management and conservation actions include increasing awareness of the public regarding turtle presence in the area through signage and education as well as legislating for a reduction in boat speeds in select areas of the bay.

KEY WORDS: Argos · Anthropogenic effects · Chelonia mydas · Eastern Pacific Ocean · Fastloc-GPS · Movements · Satellite telemetry

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Cite this article as: Eguchi T, Bredvik J, Graham S, LeRoux R, Saunders B, Seminoff JA (2020) Effects of a power plant closure on home ranges of green turtles in an urban foraging area. Endang Species Res 41:265-277.

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