Insight into coral reef ecosystems: investigations into the application of acoustics to monitor coral reefs and how corallivorous fish respond to mass coral mortality.
Coral reefs around the world are threatened by a variety of sources, from localized impacts, including overfishing and coastal development, to global temperature increases and ocean acidification. Conserving these marine biodiversity havens requires both global and local action informed by scientifi...
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ftuvicpubl:oai:dspace.library.uvic.ca:1828/12666 2023-05-15T17:52:09+02:00 Insight into coral reef ecosystems: investigations into the application of acoustics to monitor coral reefs and how corallivorous fish respond to mass coral mortality. Dimoff, Sean Baum, Julia Kathleen 2021 application/pdf http://hdl.handle.net/1828/12666 English en eng http://hdl.handle.net/1828/12666 Magel, J.M.T., Dimoff, S.A., Baum, J.K., 2020. Direct and indirect effects of climate change‐amplified pulse heat stress events on coral reef fish communities. Ecol. Appl. https://doi.org/10.1002/eap.2124 Dimoff, S.A., Halliday, W.D., Pine M.K., Tietjen K.L., Juanes F., Baum J.K. 2021. In press. The utility of different acoustic indicators to describe biological sounds of a coral reef soundscape. Ecological Indicators. Available to the World Wide Web Passive Acoustic Monitoring (PAM) Sound Pressure Level (SPL) Acoustic Complexity Index (ACI) Coral Reef Coral Reef Fishes Corallivore El Niño Marine Heatwave Underwater Acoustics Thesis 2021 ftuvicpubl https://doi.org/10.1002/eap.2124 2022-05-19T06:10:25Z Coral reefs around the world are threatened by a variety of sources, from localized impacts, including overfishing and coastal development, to global temperature increases and ocean acidification. Conserving these marine biodiversity havens requires both global and local action informed by scientific research. In this thesis, I use data collected from the coral reefs around Kiritimati atoll (Republic of Kiribati) in the central equatorial Pacific, first to assess the applicability of two common metrics used in passive underwater acoustic research, and second to examine the effects of a marine heatwave and local human disturbance on an assemblage of corallivorous fish. Using acoustic data recorded in 2017 and 2018 on reefs around Kiritimati, I assess how sound pressure level (SPL) and the acoustic complexity index (ACI) respond to changes in fish sounds in a low frequency band (160 Hz – 1 kHz) and snapping shrimp snaps in a high frequency band (1 kHz – 22 kHz). I found that while SPL was positively correlated with increases in fish sounds and snap density, changes in ACI were dependent upon the settings chosen for its calculation, with the density of snaps negatively correlated with ACI across all settings. These findings provide evidence that despite its quick and prolific adoption, acoustic metrics like ACI should be thoroughly field-tested and standardized before they are applied to new ecosystems like coral reefs. Next, using underwater visual censuses (UVCs) of reef fish assemblages, I quantified how two functional groups of corallivores, obligate and facultative, responded to a mass coral mortality event created by the 2015-2016 El Niño. Declines in abundance of both groups were largely driven by the response of coral-associated damselfishes, Plectroglyphidodon johnstonianus in the obligate group and Plectroglyphidodon dickii in the facultative group, to heat stress and subsequent coral mortality. I also observed a significant decline in the species richness of obligate corallivores, and a continued decline ... Thesis Ocean acidification University of Victoria (Canada): UVicDSpace Pacific Ecological Applications 30 6 |
institution |
Open Polar |
collection |
University of Victoria (Canada): UVicDSpace |
op_collection_id |
ftuvicpubl |
language |
English |
topic |
Passive Acoustic Monitoring (PAM) Sound Pressure Level (SPL) Acoustic Complexity Index (ACI) Coral Reef Coral Reef Fishes Corallivore El Niño Marine Heatwave Underwater Acoustics |
spellingShingle |
Passive Acoustic Monitoring (PAM) Sound Pressure Level (SPL) Acoustic Complexity Index (ACI) Coral Reef Coral Reef Fishes Corallivore El Niño Marine Heatwave Underwater Acoustics Dimoff, Sean Insight into coral reef ecosystems: investigations into the application of acoustics to monitor coral reefs and how corallivorous fish respond to mass coral mortality. |
topic_facet |
Passive Acoustic Monitoring (PAM) Sound Pressure Level (SPL) Acoustic Complexity Index (ACI) Coral Reef Coral Reef Fishes Corallivore El Niño Marine Heatwave Underwater Acoustics |
description |
Coral reefs around the world are threatened by a variety of sources, from localized impacts, including overfishing and coastal development, to global temperature increases and ocean acidification. Conserving these marine biodiversity havens requires both global and local action informed by scientific research. In this thesis, I use data collected from the coral reefs around Kiritimati atoll (Republic of Kiribati) in the central equatorial Pacific, first to assess the applicability of two common metrics used in passive underwater acoustic research, and second to examine the effects of a marine heatwave and local human disturbance on an assemblage of corallivorous fish. Using acoustic data recorded in 2017 and 2018 on reefs around Kiritimati, I assess how sound pressure level (SPL) and the acoustic complexity index (ACI) respond to changes in fish sounds in a low frequency band (160 Hz – 1 kHz) and snapping shrimp snaps in a high frequency band (1 kHz – 22 kHz). I found that while SPL was positively correlated with increases in fish sounds and snap density, changes in ACI were dependent upon the settings chosen for its calculation, with the density of snaps negatively correlated with ACI across all settings. These findings provide evidence that despite its quick and prolific adoption, acoustic metrics like ACI should be thoroughly field-tested and standardized before they are applied to new ecosystems like coral reefs. Next, using underwater visual censuses (UVCs) of reef fish assemblages, I quantified how two functional groups of corallivores, obligate and facultative, responded to a mass coral mortality event created by the 2015-2016 El Niño. Declines in abundance of both groups were largely driven by the response of coral-associated damselfishes, Plectroglyphidodon johnstonianus in the obligate group and Plectroglyphidodon dickii in the facultative group, to heat stress and subsequent coral mortality. I also observed a significant decline in the species richness of obligate corallivores, and a continued decline ... |
author2 |
Baum, Julia Kathleen |
format |
Thesis |
author |
Dimoff, Sean |
author_facet |
Dimoff, Sean |
author_sort |
Dimoff, Sean |
title |
Insight into coral reef ecosystems: investigations into the application of acoustics to monitor coral reefs and how corallivorous fish respond to mass coral mortality. |
title_short |
Insight into coral reef ecosystems: investigations into the application of acoustics to monitor coral reefs and how corallivorous fish respond to mass coral mortality. |
title_full |
Insight into coral reef ecosystems: investigations into the application of acoustics to monitor coral reefs and how corallivorous fish respond to mass coral mortality. |
title_fullStr |
Insight into coral reef ecosystems: investigations into the application of acoustics to monitor coral reefs and how corallivorous fish respond to mass coral mortality. |
title_full_unstemmed |
Insight into coral reef ecosystems: investigations into the application of acoustics to monitor coral reefs and how corallivorous fish respond to mass coral mortality. |
title_sort |
insight into coral reef ecosystems: investigations into the application of acoustics to monitor coral reefs and how corallivorous fish respond to mass coral mortality. |
publishDate |
2021 |
url |
http://hdl.handle.net/1828/12666 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
http://hdl.handle.net/1828/12666 Magel, J.M.T., Dimoff, S.A., Baum, J.K., 2020. Direct and indirect effects of climate change‐amplified pulse heat stress events on coral reef fish communities. Ecol. Appl. https://doi.org/10.1002/eap.2124 Dimoff, S.A., Halliday, W.D., Pine M.K., Tietjen K.L., Juanes F., Baum J.K. 2021. In press. The utility of different acoustic indicators to describe biological sounds of a coral reef soundscape. Ecological Indicators. |
op_rights |
Available to the World Wide Web |
op_doi |
https://doi.org/10.1002/eap.2124 |
container_title |
Ecological Applications |
container_volume |
30 |
container_issue |
6 |
_version_ |
1766159502376173568 |