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    Topography and biological noise determine acoustic detectability on coral reefs

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    Type
    Article
    Authors
    Cagua, Edgar F. cc
    Berumen, Michael L. cc
    Tyler, Elizabeth
    KAUST Department
    Red Sea Research Center (RSRC)
    Biological and Environmental Sciences and Engineering (BESE) Division
    Marine Science Program
    Reef Ecology Lab
    Date
    2013-08-19
    Online Publication Date
    2013-08-19
    Print Publication Date
    2013-12
    Permanent link to this record
    http://hdl.handle.net/10754/562911
    
    Metadata
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    Abstract
    Acoustic telemetry is an increasingly common tool for studying the movement patterns, behavior and site fidelity of marine organisms, but to accurately interpret acoustic data, the variability, periodicity and range of detectability between acoustic tags and receivers must be understood. The relative and interactive effects of topography with biological and environmental noise have not been quantified on coral reefs. We conduct two long-term range tests (1- and 4-month duration) on two different reef types in the central Red Sea to determine the relative effect of distance, depth, topography, time of day, wind, lunar phase, sea surface temperature and thermocline on detection probability. Detectability, as expected, declines with increasing distance between tags and receivers, and we find average detection ranges of 530 and 120 m, using V16 and V13 tags, respectively, but the topography of the reef can significantly modify this relationship, reducing the range by ~70 %, even when tags and receivers are in line-of-sight. Analyses that assume a relationship between distance and detections must therefore be used with care. Nighttime detection range was consistently reduced in both locations, and detections varied by lunar phase in the 4-month test, suggesting a strong influence of biological noise (reducing detection probability up to 30 %), notably more influential than other environmental noises, including wind-driven noise, which is normally considered important in open-water environments. Analysis of detections should be corrected in consideration of the diel patterns we find, and range tests or sentinel tags should be used for more than 1 month to quantify potential changes due to lunar phase. Some studies assume that the most usual factor limiting detection range is weather-related noise; this cannot be extrapolated to coral reefs. © 2013 Springer-Verlag Berlin Heidelberg.
    Citation
    Cagua, E. F., Berumen, M. L., & Tyler, E. H. M. (2013). Topography and biological noise determine acoustic detectability on coral reefs. Coral Reefs, 32(4), 1123–1134. doi:10.1007/s00338-013-1069-2
    Publisher
    Springer Nature
    Journal
    Coral Reefs
    DOI
    10.1007/s00338-013-1069-2
    ae974a485f413a2113503eed53cd6c53
    10.1007/s00338-013-1069-2
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program

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