Please use this identifier to cite or link to this item: http://hdl.handle.net/10790/6860

EXAMINING PATTERNS IN CORAL DEMOGRAPHIC EVENTS IN PAPAHĀNAUMOKUĀKEA MARINE NATIONAL MONUMENT

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Title:EXAMINING PATTERNS IN CORAL DEMOGRAPHIC EVENTS IN PAPAHĀNAUMOKUĀKEA MARINE NATIONAL MONUMENT
Authors:Bonis-Ericksen, Nola Keilani
Contributors:Burns, John hr (advisor)
Tropical Conservation Biology & Environmental Science (department)
Keywords:Environmental science
Conservation biology
Ecology
coral
demography
show 3 morereef
resiliency
Structure-from-Motion photogrammetry
show less
Date Issued:Dec 2021
Publisher:University of Hawaii at Hilo
Abstract:Identifying drivers of coral resilience and survival is critical for predicting how coral reefs will respond to changing environmental conditions. Coral reef researchers have historically struggled to temporally quantify fine-scale changes in live coral patches, such as growth and partial mortality, due to the difficulty involved in high resolution underwater mapping of coral habitats. Demographic events, including growth, shrinking, recruitment, mortality, fission, and fusion are important changes that occur in live coral patches that are indicative of capacity for resilience. The objectives of this study were to 1) examine high resolution time-series imagery collected at two timepoints to quantify these changes in coral patches (shrinking, growth, fission, fusion, mortality, recruitment) in Papahānaumokuākea Marine National Monument (PMNM), and 2) statistically explore how coral patch characteristics (size and genus) and site characteristics (coral cover and reef complexity) influence the occurrence of these demographic events. This project tracked 2409 coral patches from multiple reef sites across two timepoints spanning from 2016 to 2019. Reef characteristics associated with positive (growth, recruitment) or negative events (mortality, shrinkage) were quantified to identify drivers of coral patch resiliency. Logistic regression modeling revealed that reefs composed of larger coral patches and reefs with greater structural complexity values were associated with lower predictive probabilities of mortality events. Reef complexity, patch size, and genus were found to be statistically significant indicators of reef resiliency (growth, recruitment, survival). These findings can benefit reef management programs by providing bioindicators of reef resiliency that can be incorporated into an array of monitoring efforts to enhance our capacity to conduct vulnerability assessments of these important ecosystems.
Pages/Duration:51 pages
URI:http://hdl.handle.net/10790/6860
Rights:All UHH dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections: Tropical Conservation Biology and Environmental Science
TCBES Theses


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