Quantification of massive seasonal aggregations of blacktip sharks (Carcharhinus limbatus) in Southeast Florida
Abstract
Southeast Florida witnesses an enormous seasonal influx of upper trophic level marine predators each year as massive aggregations of migrating blacktip sharks (Carcharhinus limbatus) overwinter in nearshore waters. The narrow shelf and close proximity of the Gulf Stream current to the Palm Beach County shoreline drive tens of thousands of sharks to the shallow, coastal environment. This natural bottleneck provides a unique opportunity to estimate relative abundance. Over a four year period from 2011–2014, an aerial survey was flown approximately biweekly along the length of Palm Beach County. A high definition video camera and digital still camera mounted out of the airplane window provided a continuous record of the belt transect which extended 200 m seaward from the shoreline between Boca Raton Inlet and Jupiter Inlet. The number of sharks within the survey transect was directly counted from the video. Shark abundance peaked in the winter (January-March) with a maximum in 2011 of 12,128 individuals counted within the 75.6 km-2 belt transect. This resulted in a maximum density of 803.2 sharks km-2. By the late spring (April-May), shark abundance had sharply declined to 1.1% of its peak, where it remained until spiking again in January of the following year. Sharkmore »
- Authors:
-
- Florida Atlantic Univ., Boca Raton, FL (United States)
- Agriculture and Water Resources, Canberry City (Australia)
- Publication Date:
- Research Org.:
- Florida Atlantic Univ., Boca Raton, FL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1255119
- Grant/Contract Number:
- EE0000319
- Resource Type:
- Accepted Manuscript
- Journal Name:
- PLoS ONE
- Additional Journal Information:
- Journal Volume: 11; Journal Issue: 3; Journal ID: ISSN 1932-6203
- Publisher:
- Public Library of Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; sharks; animal migration; cameras; Florida; predation; beaches; shores; winter
Citation Formats
Kajiura, Stephen M., Tellman, Shari L., and Patterson, Heather M. Quantification of massive seasonal aggregations of blacktip sharks (Carcharhinus limbatus) in Southeast Florida. United States: N. p., 2016.
Web. doi:10.1371/journal.pone.0150911.
Kajiura, Stephen M., Tellman, Shari L., & Patterson, Heather M. Quantification of massive seasonal aggregations of blacktip sharks (Carcharhinus limbatus) in Southeast Florida. United States. https://doi.org/10.1371/journal.pone.0150911
Kajiura, Stephen M., Tellman, Shari L., and Patterson, Heather M. Wed .
"Quantification of massive seasonal aggregations of blacktip sharks (Carcharhinus limbatus) in Southeast Florida". United States. https://doi.org/10.1371/journal.pone.0150911. https://www.osti.gov/servlets/purl/1255119.
@article{osti_1255119,
title = {Quantification of massive seasonal aggregations of blacktip sharks (Carcharhinus limbatus) in Southeast Florida},
author = {Kajiura, Stephen M. and Tellman, Shari L. and Patterson, Heather M.},
abstractNote = {Southeast Florida witnesses an enormous seasonal influx of upper trophic level marine predators each year as massive aggregations of migrating blacktip sharks (Carcharhinus limbatus) overwinter in nearshore waters. The narrow shelf and close proximity of the Gulf Stream current to the Palm Beach County shoreline drive tens of thousands of sharks to the shallow, coastal environment. This natural bottleneck provides a unique opportunity to estimate relative abundance. Over a four year period from 2011–2014, an aerial survey was flown approximately biweekly along the length of Palm Beach County. A high definition video camera and digital still camera mounted out of the airplane window provided a continuous record of the belt transect which extended 200 m seaward from the shoreline between Boca Raton Inlet and Jupiter Inlet. The number of sharks within the survey transect was directly counted from the video. Shark abundance peaked in the winter (January-March) with a maximum in 2011 of 12,128 individuals counted within the 75.6 km-2 belt transect. This resulted in a maximum density of 803.2 sharks km-2. By the late spring (April-May), shark abundance had sharply declined to 1.1% of its peak, where it remained until spiking again in January of the following year. Shark abundance was inversely correlated with water temperature and large numbers of sharks were found only when water temperatures were less than 25°C. Shark abundance was also correlated with day of the year but not with barometric pressure. Although shark abundance was not correlated with photoperiod, the departure of the sharks from southeast Florida occurred around the vernal equinox. The shark migration along the United States eastern seaboard corresponds spatially and temporally with the spawning aggregations of various baitfish species. As a result, these baseline abundance data can be compared to future studies to determine if shark population size is changing and if sharks are restricting their southward migration as global water temperatures increase.},
doi = {10.1371/journal.pone.0150911},
journal = {PLoS ONE},
number = 3,
volume = 11,
place = {United States},
year = {Wed Mar 30 00:00:00 EDT 2016},
month = {Wed Mar 30 00:00:00 EDT 2016}
}
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