Show simple item record

dc.contributor.advisor Edmunds, Peter en_US
dc.contributor.author Widrick, Arien
dc.date.accessioned 2019-01-11T00:54:44Z
dc.date.copyright 2019 en_US
dc.date.issued 2019-01-10
dc.identifier.uri http://hdl.handle.net/10211.3/207656
dc.description.abstract On macroalgal-dominated reefs, the continuation of coral populations is dependent on successful recruitment and post-settlement success, both of which may be challenged by the presence of macroalgae. This study considers how the environment, particularly macroalgal abundance, contributes to the growth and survival of juvenile corals in two regions in the tropics: the South Pacific and the Caribbean. To determine how juvenile corals and coral larvae are affected by macroalgae in the back reef of Moorea, surveys and manipulative experiments were used to test the hypotheses that proximity to macroalgae with and without contact, or cover of macroalgae, will impact the survival and growth of early life stages of corals. Survival of Pocillopora damicornis larvae did not differ when they were incubated in situ adjacent to coral, macroalgae, or rock. Growth of juvenile colonies of massive Porites spp. and Pocillopora spp. were unaffected by centimeter-scale proximity to macroalgae. Additionally, growth was not affected by cover of macroalgae in 4-m2 plots, or by cages, which protected coral from macroalgal abrasion. Caged corals tended to grow faster, although this was not significant, and I hypothesize that this was related to protection from fish predation on lower cover plots, and from algae on higher cover plots. Macroalgae may not decrease Porites and Pocillopora growth through chemical effects, but factors including macroalgal cover may have indirect effects on the fish community that adversely affect exposed coral colonies. In St. John, US Virgin Islands, 12 sites distributed between White Point and Cabritte were selected and analyzed for benthic cover, herbivore abundance, rugosity, and rock type. Surveys of juvenile corals were conducted to determine whether the abundance and distribution of juvenile colonies within three types of microhabitats were affected by site characteristics, including macroalgae cover, and herbivore abundance. While the characteristics analyzed at the site level explained 75.9% of the variation between sites, these characteristics were not predictive of juvenile microhabitat distribution; ~ 75% of juvenile corals were found on exposed habitats at every site. While juvenile coral distribution among microhabitats was not related to site variation, survival rates within microhabitats may still vary among these sites.
dc.description.statementofresponsibility by Arien Widrick en_US
dc.format.extent ix, 75 pages en_US
dc.language.iso en_US en_US
dc.publisher California State University, Northridge en_US
dc.rights.uri http://scholarworks.csun.edu/xmlui/handle/10211.2/286 en_US
dc.subject coral reef
dc.subject coral ecophysiology
dc.subject ecology
dc.subject macroalgae
dc.subject phase shift
dc.subject calcification
dc.subject juvenile corals
dc.subject microhabitats
dc.subject macroalgal density
dc.subject species density
dc.subject.other Dissertations, Academic -- CSUN -- Biology. en_US
dc.title An ecophysiological investigation of the effects of macroalgae on juvenile corals and larvae on coral reefs in the Pacific and Caribbean
dc.type Thesis en_US
dc.date.updated 2019-01-11T00:54:44Z
dc.description.embargoterms 1 year en_US
dc.date.embargountil 2020-01-11T00:54:44Z
dc.contributor.department California State University, Northridge. Department of Biology en_US
dc.description.degree M.S. en_US
dc.contributor.committeeMember Carpenter, Robert en_US
dc.contributor.committeeMember Pisapia, Chiara en_US
dc.rights.license By signing and submitting this license, you the author grant permission to CSUN Graduate Studies to submit your thesis or dissertation, and any additional associated files you provide, to CSUN ScholarWorks, the institutional repository of the California State University, Northridge, on your behalf. You grant to CSUN ScholarWorks the non-exclusive right to reproduce and/or distribute your submission worldwide in electronic or any medium for non-commercial, academic purposes. You agree that CSUN ScholarWorks may, without changing the content, translate the submission to any medium or format, as well as keep more than one copy, for the purposes of security, backup and preservation. You represent that the submission is your original work, and that you have the right to grant the rights contained in this license. You also represent that your submission does not, to the best of your knowledge, infringe upon anyone's copyright. If the submission contains material for which you do not hold copyright, or for which the intended use is not permitted, or which does not reasonably fall under the guidelines of fair use, you represent that you have obtained the unrestricted permission of the copyright owner to grant CSUN ScholarWorks the rights required by this license, and that such third-party owned material is clearly identified and acknowledged within the text or content of the submission. If the submission is based upon work that has been sponsored or supported by an agency or organization other than the California State University, Northridge, you represent that you have fulfilled any right of review or other obligations required by such contract or agreement. CSUN ScholarWorks will clearly identify your name(s) as the author(s) or owner(s) of the submission, and will not make any alterations, other than those allowed by this license, to your submission. en_US


Files in this item

Icon

This item appears in the following Collection(s)

Show simple item record

Search DSpace


My Account

RSS Feeds