Acoustic accelerometry reveals diel activity patterns in premigratory Port Jackson sharks

Julianna Kadar, Monique Ladds, Johann Mourier, Joanna Day, Culum Brown

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Distinguishing the factors that influence activity within a species advances understanding of their behavior and ecology. Continuous observation in the marine environment is not feasible but biotelemetry devices provide an opportunity for detailed analysis of movements and activity patterns. This study investigated the detail that calibration of accelerometers measuring root mean square (RMS) acceleration with video footage can add to understanding the activity patterns of male and female Port Jackson sharks (Heterodontus portusjacksoni) in a captive environment. Linear regression was used to relate RMS acceleration output to time-matched behavior captured on video to quantify diel activity patterns. To validate captive data, diel patterns from captive sharks were compared with diel movement data from free-ranging sharks using passive acoustic tracking. The RMS acceleration data showed captive sharks exhibited nocturnal diel patterns peaking during the late evening before midnight and decreasing before sunrise. Correlation analysis revealed that captive animals displayed similar activity patterns to free-ranging sharks. The timing of wild shark departures for migration in the late breeding season corresponded with elevated diel activity at night within the captive individuals, suggesting a form of migratory restlessness in captivity. By directly relating RMS acceleration output to activity level, we show that sex, time of day, and sex-specific seasonal behavior all influenced activity levels. This study contributes to a growing body of evidence that RMS acceleration data are a promising method to determine activity patterns of cryptic marine animals and can provide more detailed information when validated in captivity.

LanguageEnglish
Pages8933-8944
Number of pages12
JournalEcology and Evolution
Volume9
Issue number16
DOIs
Publication statusPublished - Aug 2019

Fingerprint

accelerometry
diel activity
activity pattern
shark
sharks
acoustics
captivity
biotelemetry
captive animals
gender
animal
accelerometer
breeding season
marine environment
calibration
ecology

Bibliographical note

Copyright the Author(s) 2019. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • accelerometer
  • activity pattern
  • diel cycle
  • migratory restlessness
  • Port Jackson shark
  • root mean square acceleration

Cite this

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abstract = "Distinguishing the factors that influence activity within a species advances understanding of their behavior and ecology. Continuous observation in the marine environment is not feasible but biotelemetry devices provide an opportunity for detailed analysis of movements and activity patterns. This study investigated the detail that calibration of accelerometers measuring root mean square (RMS) acceleration with video footage can add to understanding the activity patterns of male and female Port Jackson sharks (Heterodontus portusjacksoni) in a captive environment. Linear regression was used to relate RMS acceleration output to time-matched behavior captured on video to quantify diel activity patterns. To validate captive data, diel patterns from captive sharks were compared with diel movement data from free-ranging sharks using passive acoustic tracking. The RMS acceleration data showed captive sharks exhibited nocturnal diel patterns peaking during the late evening before midnight and decreasing before sunrise. Correlation analysis revealed that captive animals displayed similar activity patterns to free-ranging sharks. The timing of wild shark departures for migration in the late breeding season corresponded with elevated diel activity at night within the captive individuals, suggesting a form of migratory restlessness in captivity. By directly relating RMS acceleration output to activity level, we show that sex, time of day, and sex-specific seasonal behavior all influenced activity levels. This study contributes to a growing body of evidence that RMS acceleration data are a promising method to determine activity patterns of cryptic marine animals and can provide more detailed information when validated in captivity.",
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Acoustic accelerometry reveals diel activity patterns in premigratory Port Jackson sharks. / Kadar, Julianna; Ladds, Monique; Mourier, Johann; Day, Joanna; Brown, Culum.

In: Ecology and Evolution, Vol. 9, No. 16, 08.2019, p. 8933-8944.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Kadar,Julianna

AU - Ladds,Monique

AU - Mourier,Johann

AU - Day,Joanna

AU - Brown,Culum

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