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MEPS
Marine Ecology Progress Series

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MEPS 654:219-224 (2020)  -  DOI: https://doi.org/10.3354/meps13503

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Changes in ocean conditions and hurricanes affect porbeagle Lamna nasus diving behavior

Zeliang Wang1,*, Rachel Horwitz1, Heather D. Bowlby2, Fuhong Ding1, Warren N. Joyce2

1Ocean and Ecosystem Sciences Division, Bedford Institute of Oceanography, Dartmouth, Nova Scotia, B2Y 4A2, Canada
2Population Ecology Division, Bedford Institute of Oceanography, Dartmouth, Nova Scotia, B2Y 4A2, Canada
*Corresponding author:

ABSTRACT: Recovered archival satellite tags afford a rare opportunity to evaluate diving behavior relative to ocean conditions at fine spatiotemporal scales. Ocean temperature and mixed layer depth (MLD) were strongly related to daily and seasonal patterns in diving behavior of an adult female porbeagle shark Lamna nasus. The shark remained below MLD when waters were strongly stratified in summer or in the Gulf Stream; the daily timing of dives was associated with local sunrise and sunset. In the presence of a hurricane, diving activity abruptly increased, coincident with upwelling causing an abrupt decrease in surface temperature. Our first report of the behavioral response to a hurricane as well as the seasonal patterns in depths, occupied temperatures, and vertical speeds suggest environmental preferences of porbeagle are not static and individuals may use horizontal, as well as vertical, movement to take advantage of areas with specific characteristics.


KEY WORDS: Ocean conditions · Hurricanes · Porbeagle · Diving behavior


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Cite this article as: Wang Z, Horwitz R, Bowlby HD, Ding F, Joyce WN (2020) Changes in ocean conditions and hurricanes affect porbeagle Lamna nasus diving behavior. Mar Ecol Prog Ser 654:219-224. https://doi.org/10.3354/meps13503

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