Diet of scalloped hammerhead shark in eastern Gulf of Mexico

Description

Juvenile scalloped hammerhead sharks, Sphyrna lewini, were collected in northwest Florida to examine foraging ecology, bioenergetics, and trophic level (30-60 cm FL mean FL 41.5 cm n 196). Diet analysis was performed using single and compound measures of prey quantity. Diet was also analyzed using seven broad diet categories (DC). Diet composition and estimated daily ration were compared to previously published information on bonnethead sharks, S. tiburo. Diet overlap was low between species. Juvenile S. lewini feed on relatively small (85 of prey items 5 shark length) teleosts (mostly bothids and sciaenids) and shrimps, whereas S. tiburo have been documented to feed mostly on crustaceans and plant material in northwest Florida. Plant material contributed little to the diet of S. lewini. Estimated daily ration was significantly lower for S. lewini (4.6 BW d-1) than for S. tiburo in northwest Florida, regardless if plant material was included in the model (p0.02 including and p0.00001 excluding plant material). Trophic level was calculated at 4.0 for S. lewini and 2.6 for S. tiburo. Stable isotope analysis showed S. lewini had significantly higher 15N values and significantly lower 13C values than S. tiburo, supporting the difference observed in calculated trophic level. These results provide evidence that small juvenile hammerhead species co-exist in coastal northwest Florida by feeding at separate trophic levels.

Resources

Name Format Description Link
0 https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/accession/download/163192
0 View the complete metadata record on InPort for more information about this dataset. https://www.fisheries.noaa.gov/inport/item/24913
0 Online Resource https://www.ncei.noaa.gov/archive/accession/0163192
0 The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
33 NOAA Data Management Plan for this record on InPort. https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/sefsc/dmp/pdf/24913.pdf
0 https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/accession/download/163192
33 NOAA Data Management Plan for this record on InPort. https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/sefsc/dmp/pdf/24913.pdf
0 View the complete metadata record on InPort for more information about this dataset. https://www.fisheries.noaa.gov/inport/item/24913
0 Online Resource https://www.ncei.noaa.gov/archive/accession/0163192
0 Global Change Master Directory (GCMD). 2024. GCMD Keywords, Version 19. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/accession/download/163192
0 View the complete metadata record on InPort for more information about this dataset. https://www.fisheries.noaa.gov/inport/item/24913
0 Online Resource https://www.ncei.noaa.gov/archive/accession/0163192
33 NOAA Data Management Plan for this record on InPort. https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/sefsc/dmp/pdf/24913.pdf
0 Global Change Master Directory (GCMD). 2024. GCMD Keywords, Version 19. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/accession/download/163192
0 View the complete metadata record on InPort for more information about this dataset. https://www.fisheries.noaa.gov/inport/item/24913
0 Online Resource https://www.ncei.noaa.gov/archive/accession/0163192
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
33 NOAA Data Management Plan for this record on InPort. https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/sefsc/dmp/pdf/24913.pdf

Tags

  • coastal waters of florida
  • fishery-dependent
  • 0163192
  • nesdis
  • scalloped hammerhead sharks
  • 1998-2005
  • biological data
  • oceans
  • water temperature
  • taxonomy
  • panama city
  • noaa
  • southeast fisheries science center
  • nmfs
  • biological classification
  • ocean temperature
  • us doc
  • st. vincent island
  • doc/noaa/nmfs/sefsc
  • sphyrna lewini
  • atlantic ocean
  • gulf of mexico
  • u.s. department of commerce
  • earth science
  • national marine fisheries service
  • bathymetry/seafloor topography
  • ocean
  • 163192
  • doc/noaa/nesdis/ncei
  • diet
  • fl laboratory
  • ysi - handheld multi-parameter instrument
  • stomach contents - prey count
  • s. lewini
  • s. tiburo
  • water depth
  • resource partitioning
  • animals - individual - stomach contents
  • foraging ecology
  • north atlantic ocean
  • gulf of america
  • scale
  • a comparison of the foraging ecology and bioenergetics of the early life-stages of two sympatric ham
  • national centers for environmental information
  • crooked island sound
  • stomach contents stomach contents - content weight
  • stomach contents - prey

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