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Movements of Juvenile Bull Sharks in Response to a Major Hurricane Within a Tropical Estuarine Nursery Area

  • Bradley A. StricklandEmail author
  • Jordan A. Massie
  • Natasha Viadero
  • Rolando Santos
  • Kirk R. Gastrich
  • Valeria Paz
  • Patrick O’Donnell
  • Andrea M. Kroetz
  • David T. Ho
  • Jennifer S. Rehage
  • Michael R. Heithaus
Special Issue: Impact of 2017 Hurricanes

Abstract

Predicting the responses of animals to environmental changes is a fundamental goal of ecology and is necessary for conservation and management of species. While most studies focus on relatively gradual changes, extreme events may have lasting impacts on populations. Animals respond to major disturbances such as hurricanes by seeking shelter, migrating, or they may fail to respond appropriately. We assessed the effects of Hurricane Irma in 2017 on the behavior and survival of juvenile bull sharks (Carcharhinus leucas) within a nursery of the Florida coastal Everglades using long-term acoustic telemetry monitoring. Most of our tagged sharks (n = 14) attempted to leave the shallow waters of the Shark River Estuary before the hurricane strike, but individuals varied in the timing and success of their movements. Eight bull sharks left within hours or days before the hurricane, but three left more than a week in advance. Nine of 11 bull sharks (~ 82%) eventually returned to the array within weeks or months of the storm. Six of these returning individuals were detected in a different coastal array in nearshore waters ca. 80 km away from the mouth of the estuary during their absence. The remaining three bull sharks moved downstream relatively late (after the hurricane) and may have died. We used binomial generalized linear mixed models to estimate the probability of presence within the array as a function of several environmental variables. Departure from the array was predicted by declining barometric pressure, increasing rate of change in pressure, and potentially fluctuations in river stage. Juvenile bull sharks may weigh multiple environmental cues, perceived predation risk, their own physical size, and shifting prey resources when making decisions during and after hurricanes.

Keywords

Animal movement Estuaries Extreme events Hurricane Juvenile bull sharks Nursery habitat Carcharhinus leucas 

Notes

Acknowledgments

We are grateful to many field and lab volunteers that assisted with capture and sample processing. This is a contribution from the Center for Coastal Oceans Research in the Institute for Water and Environment at Florida International University. B. Strickland was supported by University Graduate School and Department of Biological Sciences assistantships at Florida International University as well as an Everglades Foundation fellowship. We would like to thank Yannis Papastamatiou and two anonymous reviewers for their comments and suggestions to improve the manuscript. In addition, we would like to acknowledge Javiera Hernandez, Hugh Willoughby, and Robert Burgman for their insights on hurricanes.

Funding information

This work was supported by the National Science Foundation through the Florida Coastal Everglades Long-Term Ecological Research program under Grant DEB-1237517 and in collaboration with the RECOVER program of the Comprehensive Everglades Restoration Plan. Dissolved oxygen measurements were made as part of a project supported by the National Science Foundation through the Water Sustainability and Climate solicitation (EAR 1204572) and the National Aeronautics and Space Administration (NNX14AJ92G) under the Carbon Cycle Science Program.

Research and animal procedures were conducted under the auspices of protocol no. IACUC-16-022 from the Institutional Animal Care and Use Committee of Florida International University and in accordance with sampling permit no. EVER-2017-SCI-0031 granted by Everglades National Park.

Supplementary material

12237_2019_600_MOESM1_ESM.eps (37 kb)
Figure A1 Tracks of two acoustically tagged juvenile bull sharks (Carcharhinus leucas) that evacuated a telemetry array in the Shark River Estuary (SRE), Florida, USA. Each dot represents a daily detection. Red dotted line denotes the estimated time Hurricane Irma was reported to be at its closest (ca. 60 km) to the Shark River mainstem at 15:00 UTC 10 September 2017. (EPS 37 kb)
12237_2019_600_MOESM2_ESM.eps (38 kb)
Figure A2 Tracks of two acoustically tagged juvenile bull sharks (Carcharhinus leucas) showing potential mortality within telemetry array in the Shark River Estuary (SRE), Florida, USA. Each dot represents a daily detection. Red dotted line denotes the estimated time Hurricane Irma was reported to be at its closest (ca. 60 km) to the Shark River mainstem at 15:00 UTC 10 September 2017. (EPS 38 kb)

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Copyright information

© Coastal and Estuarine Research Federation 2019

Authors and Affiliations

  • Bradley A. Strickland
    • 1
    Email author
  • Jordan A. Massie
    • 2
  • Natasha Viadero
    • 2
  • Rolando Santos
    • 2
  • Kirk R. Gastrich
    • 1
  • Valeria Paz
    • 1
  • Patrick O’Donnell
    • 3
  • Andrea M. Kroetz
    • 4
  • David T. Ho
    • 5
  • Jennifer S. Rehage
    • 2
  • Michael R. Heithaus
    • 1
  1. 1.Department of Biological SciencesFlorida International UniversityMiamiUSA
  2. 2.Department of Earth and EnvironmentFlorida International UniversityMiamiUSA
  3. 3.Rookery Bay National Estuarine Research Reserve, Florida Department of Environmental ProtectionNaplesUSA
  4. 4.Riverside Technologies, Inc. for National Oceanic and Atmospheric Association, National Marine Fisheries Service, Southeast Fisheries Science CenterPanama CityUSA
  5. 5.Department of OceanographyUniversity of Hawaii at ManoaHonoluluUSA

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