Utilization of Low Altitude Remote Sensing Techniques for Coral Bleaching Assessments
Date
2016-12
Authors
Contributor
Advisor
Department
Instructor
Depositor
Speaker
Researcher
Consultant
Interviewer
Narrator
Transcriber
Annotator
Journal Title
Journal ISSN
Volume Title
Publisher
[Honolulu] : [University of Hawaii at Manoa], [December 2016]
Volume
Number/Issue
Starting Page
Ending Page
Alternative Title
Abstract
The utilization of small-unmanned aerial systems (sUAS) as a cheap, effective complement to other assessment tools is imminent in the field of coral reef ecology. Here, we describe the current status of sUAS in the field of coastal monitoring, and introduce the utilization of low-altitude sUAS assessments for coral reef research using proof-of-concept results and completed work describing the distribution of coral bleaching across several patch reefs in Kāneʻohe Bay, Hawaii. Overlapping sub- centimeter reef imagery collected during the 2015 coral bleaching event was used to construct complete high-resolution reef images of four Kāneʻohe Bay patch reefs located in “long residence time” and “short residence time” flow regimes. The spatial distributions of bleached and paled corals were assessed in relation to coastal stressors (sedimentation rates, salinity and phosphate concentrations). Results support the notion that phosphate, an important inorganic nutrient, differed significantly between “closer to shore” and “further from shore” reefs instead of between previously determined flow regimes. Mean phosphate concentrations and salinities were both significantly correlated to unhealthy (bleached or paled) coral cover. When assessing the environmental conditions in close temporal proximity to image collection, only salinity had a strong negative correlation with the cover of unhealthy coral. Paled, bleached, and healthy coral on all four reefs were significantly clumped spatially, although bleached corals had the largest mean distances between affected colonies. This project provides valuable insight into the relationships between Kāneʻohe Bay patch reefs and coastal stressors at previously unexplored spatial scales, and demonstrates the effective use of sUAS surveys in the field of coral reef science.
Description
M.S. University of Hawaii at Manoa 2016.
Includes bibliographical references.
Includes bibliographical references.
Keywords
coral reef, remote sensing, coral bleaching, unmanned aerial systems
Citation
Extent
Format
Geographic Location
Time Period
Related To
Theses for the degree of Master of Science (University of Hawaii at Manoa). Marine Biology
Related To (URI)
Table of Contents
Rights
Rights Holder
Local Contexts
Collections
Email libraryada-l@lists.hawaii.edu if you need this content in ADA-compliant format.