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Speed of travel of migrating Green turtles (Chelonia mydas) from Ascension Island to Brazil. / Pilar Santidrian Tomillo

Swansea University Author: Pilar Santidrian Tomillo

Abstract

This thesis investigates the speed of travel during migration from Ascension Island to Brazil of 12 female green sea turtles (Chelonia niydas). Diving behaviour (Mean dive duration, standard deviation of the mean dive duration and number of dives), the prevailing oceanic currents (north-south compon...

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Published: 2002
Institution: Swansea University
Degree level: Master of Philosophy
Degree name: M.Phil
URI: https://cronfa.swan.ac.uk/Record/cronfa42601
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first_indexed 2018-08-02T18:55:06Z
last_indexed 2019-10-21T16:48:07Z
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spelling 2018-08-16T14:39:02.9105634 v2 42601 2018-08-02 Speed of travel of migrating Green turtles (Chelonia mydas) from Ascension Island to Brazil. 11037f76a86c75dd0dfda2579cd47f45 NULL Pilar Santidrian Tomillo Pilar Santidrian Tomillo true true 2018-08-02 This thesis investigates the speed of travel during migration from Ascension Island to Brazil of 12 female green sea turtles (Chelonia niydas). Diving behaviour (Mean dive duration, standard deviation of the mean dive duration and number of dives), the prevailing oceanic currents (north-south component, east-west component, speed of the current and angle between the direction of the current and the direction of the turtle) and size, were analysed to determine their possible influence on the speed of travel. Two different methods were applied: (1) a detailed analysis made by dividing the migration route into pixels of 1.25&deg; longitude x 1.25&deg; latitude and (2) a general study on the overall speed of travel. The mean speed of travel of migrating Ascension Island green turtles was found to be 2.59 km/h, most likely to be the speed at which the Cost of Transport (COT) is minimal. The speed of migrating turtles from Ascension Island depends on the mean duration of dives, the number of dives and the angle between the direction they follow and that of the prevailing current. The main factor explaining the variation of the speed of travel of Ascension Island turtles is the duration of the dives. Mean dive duration, its standard deviation and number of dives, are related to the size of the turtles. E-Thesis Biological oceanography. 31 12 2002 2002-12-31 COLLEGE NANME Biosciences COLLEGE CODE Swansea University Master of Philosophy M.Phil 2018-08-16T14:39:02.9105634 2018-08-02T16:24:29.8057994 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Pilar Santidrian Tomillo NULL 1 0042601-02082018162507.pdf 10805359.pdf 2018-08-02T16:25:07.3100000 Output 3091540 application/pdf E-Thesis true 2018-08-02T16:25:07.3100000 false
title Speed of travel of migrating Green turtles (Chelonia mydas) from Ascension Island to Brazil.
spellingShingle Speed of travel of migrating Green turtles (Chelonia mydas) from Ascension Island to Brazil.
Pilar Santidrian Tomillo
title_short Speed of travel of migrating Green turtles (Chelonia mydas) from Ascension Island to Brazil.
title_full Speed of travel of migrating Green turtles (Chelonia mydas) from Ascension Island to Brazil.
title_fullStr Speed of travel of migrating Green turtles (Chelonia mydas) from Ascension Island to Brazil.
title_full_unstemmed Speed of travel of migrating Green turtles (Chelonia mydas) from Ascension Island to Brazil.
title_sort Speed of travel of migrating Green turtles (Chelonia mydas) from Ascension Island to Brazil.
author_id_str_mv 11037f76a86c75dd0dfda2579cd47f45
author_id_fullname_str_mv 11037f76a86c75dd0dfda2579cd47f45_***_Pilar Santidrian Tomillo
author Pilar Santidrian Tomillo
author2 Pilar Santidrian Tomillo
format E-Thesis
publishDate 2002
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 1
active_str 0
description This thesis investigates the speed of travel during migration from Ascension Island to Brazil of 12 female green sea turtles (Chelonia niydas). Diving behaviour (Mean dive duration, standard deviation of the mean dive duration and number of dives), the prevailing oceanic currents (north-south component, east-west component, speed of the current and angle between the direction of the current and the direction of the turtle) and size, were analysed to determine their possible influence on the speed of travel. Two different methods were applied: (1) a detailed analysis made by dividing the migration route into pixels of 1.25&deg; longitude x 1.25&deg; latitude and (2) a general study on the overall speed of travel. The mean speed of travel of migrating Ascension Island green turtles was found to be 2.59 km/h, most likely to be the speed at which the Cost of Transport (COT) is minimal. The speed of migrating turtles from Ascension Island depends on the mean duration of dives, the number of dives and the angle between the direction they follow and that of the prevailing current. The main factor explaining the variation of the speed of travel of Ascension Island turtles is the duration of the dives. Mean dive duration, its standard deviation and number of dives, are related to the size of the turtles.
published_date 2002-12-31T03:53:17Z
_version_ 1763752644346642432
score 11.037581

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