Short Citation:
Southeast Fisheries Science Center, 2019: Diet of bonnethead shark in eastern Gulf of Mexico, https://inport.nmfs.noaa.gov/inport/item/24912.

Item Identification

Title: Diet of bonnethead shark in eastern Gulf of Mexico
Short Name: Stomach contents of bonnethead sharks in eastern Gulf of Mexico
Status: Completed
Publication Date: 2017
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.

Supplemental Information:

Please note that the data provided to the archive consists of two data tables joined together. The "Header" table information can be recreated by just taking the columns from this one before the second shark number column, and then eliminating all blank records.

To Get just the stomach contents information chop of all columns before this in the table.

Keywords

Theme Keywords

Thesaurus Keyword
None Anclote Key
None bonnethead
None diet
None Florida Bay
None Tampa Bay
None young-of-the-year

Stratum Keywords

Thesaurus Keyword
None Gulf of Mexico

Physical Location

Organization: NESDIS National Oceanographic Data Center
City: Silver Spring
State/Province: MD

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: CSV Files
Maintenance Frequency: None Planned
Data Presentation Form: Table (digital)
Instrument (Deprecated): N/A
Platform (Deprecated): N/A
Physical Collection / Fishing Gear (Deprecated): N/A

Support Roles

Data Steward

CC ID: 566189
Date Effective From: 2016
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

Data Steward

CC ID: 280079
Date Effective From: 1998
Date Effective To: 2016
Contact (Person): Bethea, Dana M
Address: 263 13th Avenue South
St Petersberg, FL 33701
Email Address: Dana.Bethea@noaa.gov
Contact Instructions:

Has gotten a position with a different NMFS organization

Distributor

CC ID: 283196
Date Effective From: 2017
Date Effective To:
Contact (Organization): NESDIS National Oceanographic Data Center (NESDIS-NODC)
Address: 1315 East-West Highway
Silver Spring, MD 20902
Phone: 301-713-3277
URL: http://www.nodc.noaa.gov/

Metadata Contact

CC ID: 566190
Date Effective From: 2016
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

Metadata Contact

CC ID: 235086
Date Effective From: 1998
Date Effective To: 2016
Contact (Person): Bethea, Dana M
Address: 263 13th Avenue South
St Petersberg, FL 33701
Email Address: Dana.Bethea@noaa.gov

Point of Contact

CC ID: 280082
Date Effective From: 2015
Date Effective To:
Contact (Person): Harrell, Emily
Address: 3500 Delwood Beach Road
Panama City, FL 32408
Email Address: emily.harrell@noaa.gov
Phone: 850-234-6541 x 227
Fax: 850-235-3559
Contact Instructions:

Contact by email preferred.

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 273984
W° Bound: -85.292
E° Bound: -82.063
N° Bound: 29.978
S° Bound: 25.056
Description

Localized Sampling Area

Extent Group 1 / Time Frame 1

CC ID: 273983
Time Frame Type: Range
Start: 2001
End: 2002

Extent Group 2

No extents defined for this group.

Access Information

Security Class: Unclassified
Security Classification System:

No security classification system is applicable

Security Handling Description:

This document is available to all government employees and the public.

Data Access Policy:

This document is available to all government employees and the public.

Data Access Procedure:

Access by URL

Data Access Constraints:

None

Data Use Constraints:

Not for use in litigation.

Metadata Access Constraints:

No access constraints are applicable.

Metadata Use Constraints:

Please cite as appropriate

Distribution Information

Distribution 1

CC ID: 598478
Start Date: 2017-08-17
End Date: Present
Download URL: https://www.nodc.noaa.gov/archive/arc0111/0163192/1.1/data/0-data/24912/
Distributor: NESDIS National Oceanographic Data Center (NESDIS-NODC) (2017 - Present)
Description:

Directory Containing The Files To Be Downloaded

Compression: no compression applied
Review Status: Not Chked

Distribution 2

CC ID: 283203
Start Date: 2017
End Date: Present
Download URL: https://data.nodc.noaa.gov/cgi-bin/iso?id=gov.noaa.nodc:0163192
Distributor: NESDIS National Oceanographic Data Center (NESDIS-NODC) (2017 - Present)
Description:

Landing Page Ascension Number 0163192

Review Status: Not Chked

Data Quality

Quality Control Procedures Employed:

N/A

Data Management

Have Resources for Management of these Data Been Identified?: No
Approximate Percentage of Budget for these Data Devoted to Data Management: 0
Do these Data Comply with the Data Access Directive?: Yes
Is Access to the Data Limited Based on an Approved Waiver?: Yes
If Distributor (Data Hosting Service) is Needed, Please Indicate: No
Approximate Delay Between Data Collection and Dissemination: 365
Actual or Planned Long-Term Data Archive Location: NCEI-MD
Approximate Delay Between Data Collection and Archiving: 365
How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?:

The data resides on a secure government network requiring multi-factor authentication for network access.

Lineage

Process Steps

Process Step 1

CC ID: 283202
Description:

Data was entered by hand into the database and saved on a local computer.

Catalog Details

Catalog Item ID: 24912
Metadata Record Created By: Emily Harrell
Metadata Record Created: 2015-05-05 10:45+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2019-06-04 13:14+0000
Metadata Record Published: 2017-08-17
Owner Org: SEFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2018-08-18