Geographic and ontogenetic variation in the diet and daily of the bonnethead shark, sphyrna tiburo in eastern Gulf of Mexico
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Summary
To examine variation in diet and daily ration of the bonnethead, Sphyrna tiburo (Linnaeus, 1758), sharks were collected from three areas in the eastern Gulf of Mexico: northwest Florida (29o40N, 85o13W), Anclote Key near Tampa Bay (28o10N, 82o42.5W), and Florida Bay (24o50N, 80o48W) from March through September, 1998-2000. In each area, diet was assessed by life stage (young-of-the year, juveniles, and adults) and quantified using five indices: percent by number (N), percent by weight (W), frequency of occurrence (O), index of relative importance expressed on a percent basis (IRI), and IRI based on diet category (IRIDC). Diet could not be assessed for young-of-the-year in Tampa Bay or Florida Bay owing to low sample size. Diet analysis showed an ontogenetic shift in northwest Florida. Young-of-the-year stomachs from northwest Florida (n68, 1 empty) contained a mix of seagrass and crustaceans while juvenile stomachs (n82, 0 empty) contained a mix of crabs and seagrass and adult stomachs (n39, 1 empty) contained almost exclusively crabs. Crabs made up the majority of both juvenile and adult diet in Tampa Bay (n79, 2 empty, and n88, 1 empty, respectively). Juvenile stomachs from Florida Bay (n72, 0 empty) contained seagrass and a mix of crustaceans while adult stomachs contained more shrimp and cephalopods (n82, 3 empty). Diets in northwest Florida and Tampa Bay were similar. The diet in Florida Bay was different from those in the other two areas, consisting of fewer crabs and more cephalopods and lobsters. Plant material was found in large quantities in all stomachs examined from all locations (15 IRIDC in 6 of the 7 life stage-area combinations, 30 IRIDC in 4 of the 7 combinations, and 62 IRIDC in young-of-the-year diet in northwest Florida). Using species- and area-specific inputs, a bioenergetic model was constructed to estimate daily ration. Models were constructed under two scenarios: assuming plant material was and was not part of the diet. Overall, daily ration was significantly different by sex, life stage, and region. The bioenergetic model predicted increasing daily ration with decreasing latitude and decreasing daily ration with ontogeny regardless of the inclusion or exclusion of plant material. These results provide evidence that bonnetheads continuously exposed to warmer temperatures have elevated metabolism and require additional energy consumption to maintain growth and reproduction.
Document Information
Document Type
Journal article
Document Format
Acrobat Portable Document Format
Publication Date
2007-05-04
Contact Information
Metadata Contact
John Carlson
John.Carlson@noaa.gov
850-234-6541 x221
Item Identification
Title: | Geographic and ontogenetic variation in the diet and daily of the bonnethead shark, sphyrna tiburo in eastern Gulf of Mexico |
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Status: | Completed |
Publication Date: | 2007-05-04 |
Abstract: |
To examine variation in diet and daily ration of the bonnethead, Sphyrna tiburo (Linnaeus, 1758), sharks were collected from three areas in the eastern Gulf of Mexico: northwest Florida (29o40N, 85o13W), Anclote Key near Tampa Bay (28o10N, 82o42.5W), and Florida Bay (24o50N, 80o48W) from March through September, 1998-2000. In each area, diet was assessed by life stage (young-of-the year, juveniles, and adults) and quantified using five indices: percent by number (N), percent by weight (W), frequency of occurrence (O), index of relative importance expressed on a percent basis (IRI), and IRI based on diet category (IRIDC). Diet could not be assessed for young-of-the-year in Tampa Bay or Florida Bay owing to low sample size. Diet analysis showed an ontogenetic shift in northwest Florida. Young-of-the-year stomachs from northwest Florida (n68, 1 empty) contained a mix of seagrass and crustaceans while juvenile stomachs (n82, 0 empty) contained a mix of crabs and seagrass and adult stomachs (n39, 1 empty) contained almost exclusively crabs. Crabs made up the majority of both juvenile and adult diet in Tampa Bay (n79, 2 empty, and n88, 1 empty, respectively). Juvenile stomachs from Florida Bay (n72, 0 empty) contained seagrass and a mix of crustaceans while adult stomachs contained more shrimp and cephalopods (n82, 3 empty). Diets in northwest Florida and Tampa Bay were similar. The diet in Florida Bay was different from those in the other two areas, consisting of fewer crabs and more cephalopods and lobsters. Plant material was found in large quantities in all stomachs examined from all locations (15 IRIDC in 6 of the 7 life stage-area combinations, 30 IRIDC in 4 of the 7 combinations, and 62 IRIDC in young-of-the-year diet in northwest Florida). Using species- and area-specific inputs, a bioenergetic model was constructed to estimate daily ration. Models were constructed under two scenarios: assuming plant material was and was not part of the diet. Overall, daily ration was significantly different by sex, life stage, and region. The bioenergetic model predicted increasing daily ration with decreasing latitude and decreasing daily ration with ontogeny regardless of the inclusion or exclusion of plant material. These results provide evidence that bonnetheads continuously exposed to warmer temperatures have elevated metabolism and require additional energy consumption to maintain growth and reproduction. |
Purpose: |
To (1) describe and quantify the diet and feeding ecology of bonnetheads by life stage and area (following Lombardi-Carlson et al. 2003), and (2) model consumption using a bioenergetic approach for life stages and sexes from each area, examining the sensitivity of the model to input parameters. |
Other Citation Details: |
Bethea, D.M., Hale, L., Carlson, J.K. et al. Mar Biol (2007) 152: 1009. doi:10.1007/s00227-007-0728-7 |
Keywords
Theme Keywords
Thesaurus | Keyword |
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UNCONTROLLED | |
None | Anclote Key |
None | bonnethead |
None | diet |
None | Florida Bay |
None | Tampa Bay |
None | young-of-the-year |
Stratum Keywords
Thesaurus | Keyword |
---|---|
UNCONTROLLED | |
None | Gulf of Mexico |
Document Information
Document Type: | Journal article |
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Format: | Acrobat Portable Document Format |
Status Code: | Published |
Support Roles
Co-Author
Date Effective From: | 2007 |
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Date Effective To: | |
Contact (Person): | Carlson, John |
Address: |
3500 Delwood Beach Road Panama City, FL 32408 |
Email Address: | John.Carlson@noaa.gov |
Phone: | 850-234-6541 x221 |
Fax: | 850-235-3559 |
Contact Instructions: |
Contact by email preferred. |
Data Steward
Date Effective From: | 2016 |
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Date Effective To: | |
Contact (Person): | Carlson, John |
Address: |
3500 Delwood Beach Road Panama City, FL 32408 |
Email Address: | John.Carlson@noaa.gov |
Phone: | 850-234-6541 x221 |
Fax: | 850-235-3559 |
Distributor
Date Effective From: | 2007 |
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Date Effective To: | |
Contact (Organization): | Southeast Fisheries Science Center (SEFSC) |
Address: |
75 Virginia Beach Drive Miami, FL 33149 USA |
Phone: | (305)361-5761 |
URL: | https://www.fisheries.noaa.gov/about/southeast-fisheries-science-center |
Business Hours: | 8:00 a.m. - 4:30 p.m. EST |
Metadata Contact
Date Effective From: | 2016 |
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Date Effective To: | |
Contact (Person): | Carlson, John |
Address: |
3500 Delwood Beach Road Panama City, FL 32408 |
Email Address: | John.Carlson@noaa.gov |
Phone: | 850-234-6541 x221 |
Fax: | 850-235-3559 |
Access Information
Security Class: | Unclassified |
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URLs
URL 1
URL: | https://link.springer.com/article/10.1007/s00227-007-0728-7 |
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URL Type: |
Online Resource
|
Description: |
Landing Page For Journal Article |
URL 2
URL: | https://www.researchgate.net/profile/Dana_Bethea/publication/226288832_Geographic_and_ontogenetic_variation_in_the_diet_and_daily_ration_of_the_bonnethead_shark_Sphyrna_tiburo_from_the_eastern_Gulf_of_Mexico/links/00b7d51d2de06b0033000000/Geographic-and-ontogenetic-variation-in-the-diet-and-daily-ration-of-the-bonnethead-shark-Sphyrna-tiburo-from-the-eastern-Gulf-of-Mexico.pdf |
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URL Type: |
Online Resource
|
Description: |
Download Page From Dana Bethea's publications on Researchgate |
URL 3
URL: | https://www.ncddc.noaa.gov/approved_recs/ecowatch/game/GAME_2563.xml |
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URL Type: |
Online Resource
|
File Resource Format: | xml |
Description: |
.xml file of metdata for article from the National Coastal Data Development Center of NOAA |
Catalog Details
Catalog Item ID: | 46157 |
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GUID: | gov.noaa.nmfs.inport:46157 |
Metadata Record Created By: | Lee M Weinberger |
Metadata Record Created: | 2017-06-02 00:21+0000 |
Metadata Record Last Modified By: | SysAdmin InPortAdmin |
Metadata Record Last Modified: | 2022-08-09 17:11+0000 |
Metadata Record Published: | 2022-05-31 |
Owner Org: | SEFSC |
Metadata Publication Status: | Published Externally |
Do Not Publish?: | N |
Metadata Last Review Date: | 2022-05-31 |
Metadata Review Frequency: | 1 Year |
Metadata Next Review Date: | 2023-05-31 |