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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/29336

Title: Influence of surface currents on post-nesting migration of green sea turtles nesting on Wan-an Island, Penghu Archipelago, Taiwan
Authors: I-Jiunn Cheng;Yu-Huai Wang
Contributors: NTOU:Institute of Marine Biology
國立臺灣海洋大學:海洋生物研究所
Keywords: turtle migration;satelite telemetry;swimming speed;Taiwan strait
Date: 2009-01
Issue Date: 2011-10-21T03:05:21Z
Publisher: Journal of Marine Science and Technology
Abstract: Abstract:The relationships between ambient flows and the migration corridors of green turtles (Chelonia mydas) nesting at Wan-an Island, Penghu Archipelago in Taiwan Strait were determined. Six turtles deployed with Argos-linked satellite tags from 1996 to 2004 were used. The ambient flows were derived from the combination of ship board measurements, a global tidal model, and the geostrophic flows derived from sea surface height anomalies. The results showed that there were, basically, three migrating patterns. Turtles that migrated northeastward rode the main surface currents, traveling 2000 km in a month. The swimming speeds along the track were less than 0.5 m s -1 . More than half of their migration energy was spent in adjust their headings against the tidal currents. Turtles that travel southward against the current had swimming speeds over 1 m s -1 . These turtles corrected their headings and increased swim-ming speeds when they encountered oceanic eddies that de-flected them from their destination. For the third migration pattern, turtles used the coast landmarks as migration guides, swimming constantly at 0.7 m s -1 . Their migration distance was proportional to the swimming speed with little influence from the flows in shallow coastal waters. All three patterns showed very good compass sense in migration orientation and the swimming speeds were related to the ambient current.
Relation: 17(4), pp.306-311
URI: http://ntour.ntou.edu.tw/handle/987654321/29336
Appears in Collections:[海洋生物研究所] 期刊論文

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