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The reproductive ecology of two corals and one gorgonian from sub-tropical Bermuda. / Samantha Julie de Putron

Swansea University Author: Samantha Julie de Putron

Abstract

This study examines the sexual reproductive ecology of three species of corals common on the sub-tropical reefs of Bermuda: the scleractinians Porites astreoides and Madracis mirabilis, and the gorgonian Pseudoplexaura porosa. The reproductive biology of corals in Bermuda is of particular interest b...

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Published: 2003
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42702
first_indexed 2018-08-02T18:55:20Z
last_indexed 2018-08-03T10:10:52Z
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recordtype RisThesis
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spelling 2018-08-02T16:24:30.1646016 v2 42702 2018-08-02 The reproductive ecology of two corals and one gorgonian from sub-tropical Bermuda. fdb79238b96f47fe71889b784a3de35a NULL Samantha Julie de Putron Samantha Julie de Putron true true 2018-08-02 This study examines the sexual reproductive ecology of three species of corals common on the sub-tropical reefs of Bermuda: the scleractinians Porites astreoides and Madracis mirabilis, and the gorgonian Pseudoplexaura porosa. The reproductive biology of corals in Bermuda is of particular interest because low winter seawater temperatures and geographical isolation make it an extreme of distribution for many of the species there. In addition, the Bermuda platform comprises reef zones that experience gradients of temperature, sediment loading and wave intensity at the different depths. The objectives are twofold; firstly, information is presented on the reproductive mode, sexuality and fecundity of the corals, and the occurrence of lunar periodicity to gamete development, planula release or spawning. The second objective addresses the question of whether environmental variability across the Bermuda platform and between years alters the reproductive cycles of these species. The study species varied in reproductive mode and sexuality. The scleractinian Porites astreoides is a brooder with a mixed sexuality; the gorgonian Pseudoplexaura porosa exhibits gonochorism with broadcasting, and the scleractinian Madracis mirabilis has hermaphroditic colonies with a proposed intermediate 'pseudo-brooding' reproductive mode. Fecundity was variable within and between Po. astreoides colonies but was not related to colony size. There was a relationship between polyp size and gamete production in Ps. porosa. The synchrony of lunar periodicity to spawning or planulae release varied between the species and this is related to the different reproductive modes. The extent that planula release of Po. astreoides was synchronised to the lunar cycle also varied according to the reef zone in Bermuda, a proposed consequence of variable turbidity levels from inshore to offshore. Observed differences in the reproductive effort of Po. astreoides and Ps. porosa, both at the different reef zones within Bermuda, as well across study years, are related to spatial and inter-annual variations in temperature profiles. E-Thesis Biological oceanography. 31 12 2003 2003-12-31 COLLEGE NANME Biosciences COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:30.1646016 2018-08-02T16:24:30.1646016 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Samantha Julie de Putron NULL 1 0042702-02082018162515.pdf 10807471.pdf 2018-08-02T16:25:15.2500000 Output 18845722 application/pdf E-Thesis true 2018-08-02T16:25:15.2500000 false
title The reproductive ecology of two corals and one gorgonian from sub-tropical Bermuda.
spellingShingle The reproductive ecology of two corals and one gorgonian from sub-tropical Bermuda.
Samantha Julie de Putron
title_short The reproductive ecology of two corals and one gorgonian from sub-tropical Bermuda.
title_full The reproductive ecology of two corals and one gorgonian from sub-tropical Bermuda.
title_fullStr The reproductive ecology of two corals and one gorgonian from sub-tropical Bermuda.
title_full_unstemmed The reproductive ecology of two corals and one gorgonian from sub-tropical Bermuda.
title_sort The reproductive ecology of two corals and one gorgonian from sub-tropical Bermuda.
author_id_str_mv fdb79238b96f47fe71889b784a3de35a
author_id_fullname_str_mv fdb79238b96f47fe71889b784a3de35a_***_Samantha Julie de Putron
author Samantha Julie de Putron
author2 Samantha Julie de Putron
format E-Thesis
publishDate 2003
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 study examines the sexual reproductive ecology of three species of corals common on the sub-tropical reefs of Bermuda: the scleractinians Porites astreoides and Madracis mirabilis, and the gorgonian Pseudoplexaura porosa. The reproductive biology of corals in Bermuda is of particular interest because low winter seawater temperatures and geographical isolation make it an extreme of distribution for many of the species there. In addition, the Bermuda platform comprises reef zones that experience gradients of temperature, sediment loading and wave intensity at the different depths. The objectives are twofold; firstly, information is presented on the reproductive mode, sexuality and fecundity of the corals, and the occurrence of lunar periodicity to gamete development, planula release or spawning. The second objective addresses the question of whether environmental variability across the Bermuda platform and between years alters the reproductive cycles of these species. The study species varied in reproductive mode and sexuality. The scleractinian Porites astreoides is a brooder with a mixed sexuality; the gorgonian Pseudoplexaura porosa exhibits gonochorism with broadcasting, and the scleractinian Madracis mirabilis has hermaphroditic colonies with a proposed intermediate 'pseudo-brooding' reproductive mode. Fecundity was variable within and between Po. astreoides colonies but was not related to colony size. There was a relationship between polyp size and gamete production in Ps. porosa. The synchrony of lunar periodicity to spawning or planulae release varied between the species and this is related to the different reproductive modes. The extent that planula release of Po. astreoides was synchronised to the lunar cycle also varied according to the reef zone in Bermuda, a proposed consequence of variable turbidity levels from inshore to offshore. Observed differences in the reproductive effort of Po. astreoides and Ps. porosa, both at the different reef zones within Bermuda, as well across study years, are related to spatial and inter-annual variations in temperature profiles.
published_date 2003-12-31T05:49:26Z
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score 11.098581

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