A quantitative comparison of towed-camera and diver-camera transects for monitoring coral reefs
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Date
2021
Open Access Location
Journal Title
Journal ISSN
Volume Title
Publisher
PeerJ Inc.
Rights
(c) 2021 The Author/s
CC BY 4.0
CC BY 4.0
Abstract
Novel tools and methods for monitoring marine environments can improve efficiency but must not compromise long-term data records. Quantitative comparisons between new and existing methods are therefore required to assess their compatibility for monitoring. Monitoring of shallow water coral reefs is typically conducted using diver-based collection of benthic images along transects. Diverless systems for obtaining underwater images (e.g. towed-cameras, remotely operated vehicles, autonomous underwater vehicles) are increasingly used for mapping coral reefs. Of these imaging platforms, towed-cameras offer a practical, low cost and efficient method for surveys but their utility for repeated measures in monitoring studies has not been tested. We quantitatively compare a towed-camera approach to repeated surveys of shallow water coral reef benthic assemblages on fixed transects, relative to benchmark data from diver photo-transects. Differences in the percent cover detected by the two methods was partly explained by differences in the morphology of benthic groups. The reef habitat and physical descriptors of the site-slope, depth and structural complexity-also influenced the comparability of data, with differences between the tow-camera and the diver data increasing with structural complexity and slope. Differences between the methods decreased when a greater number of images were collected per tow-camera transect. We attribute lower image quality (variable perspective, exposure and focal distance) and lower spatial accuracy and precision of the towed-camera transects as the key reasons for differences in the data from the two methods and suggest changes to the sampling design to improve the application of tow-cameras to monitoring.
Description
Keywords
Benthic, Coral reef monitoring, Image analysis, Mapping, Methodology, Methods comparison, Technology, Towed video
Citation
Cresswell AK, Ryan NM, Heyward AJ, Smith ANH, Colquhoun J, Case M, Birt MJ, Chinkin M, Wyatt M, Radford B, Costello P, Gilmour JP. (2021). A quantitative comparison of towed-camera and diver-camera transects for monitoring coral reefs.. PeerJ. 9. (pp. e11090-).