Short Citation:
Southeast Fisheries Science Center, 2019: Diet of scalloped hammerhead shark in eastern Gulf of Mexico, https://inport.nmfs.noaa.gov/inport/item/24913.

Item Identification

Title: Diet of scalloped hammerhead shark in eastern Gulf of Mexico
Status: Completed
Abstract:

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.

Purpose:

To (1) quantify the diet and foraging ecology of juvenile S. lewini in northwest Florida, (2) model consumption rates using a bioenergetics approach, and (3) compare our findings to previously published diet and bioenergetics data for juvenile S. tiburo from the same area (Bethea et al. 2007) in an attempt to understand resource partitioning.

Keywords

Theme Keywords

Thesaurus Keyword
None diet
None foraging ecology
None resource partitioning
None S. lewini
None S. tiburo
None scalloped hammerhead sharks

Temporal Keywords

Thesaurus Keyword
None 1998-2005

Spatial Keywords

Thesaurus Keyword
None Crooked Island Sound
None gulf of mexico
None northwest Florida
None St. Vincent Island

Physical Location

Organization: National Centers for Environmental Information - Silver Spring, Maryland
City: Silver Spring
State/Province: MD

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Database
Maintenance Frequency: None Planned
Data Set Creation Date: 1998
Data Set Revision Date: 2017
Data Set Publication Status: Published
Data Set Publication Date: 2017
Data Presentation Form: Table (digital)
Instrument (Deprecated): N/A
Platform (Deprecated): Boats
Physical Collection / Fishing Gear (Deprecated): gillnets

Support Roles

Co-Author

CC ID: 830746
Date Effective From: 2005
Date Effective To:
Contact (Person): Bethea, Dana M
Address: 263 13th Avenue South
St Petersberg, FL 33701
Email Address: Dana.Bethea@noaa.gov

Data Steward

CC ID: 388147
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

Distributor

CC ID: 283205
Date Effective From: 2017
Date Effective To:
Contact (Organization): National Centers for Environmental Information - Silver Spring, Maryland (NCEI-MD)
Address: NOAA/NESDIS E/OC SSMC3, 4th Floor, 1351 East-West Highway
Silver Spring, MD 20910-3282
Phone: (301) 713-3277

Metadata Contact

CC ID: 388148
Date Effective From: 2016
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:

Phone or email

Metadata Contact

CC ID: 273992
Date Effective From: 1998
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

Point of Contact

CC ID: 283207
Date Effective From: 2007
Date Effective To:
Contact (Person): Davenport, Guy
Address: 3500 Delwood Beach Road
Panama City, FL 32408
Email Address: Guy.Davenport@noaa.gov
Phone: 850-234-6541 x 203
Fax: 850-235-3559
Contact Instructions:

Contact by email preferred.

Publisher

CC ID: 830747
Date Effective From: 2017
Date Effective To:
Contact (Organization): Panama City Laboratory (PANLAB)
Address: 3500 Delwood Beach Road
Panama City, FL 32408
Phone: 850.234.6541
URL: http://www.sefsc.noaa.gov/labs/panama/

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 273996
W° Bound: -85.887
E° Bound: -85.087
N° Bound: 30.275
S° Bound: 29.652
Description

Localized Sampling Area

Extent Group 1 / Time Frame 1

CC ID: 273995
Time Frame Type: Range
Start: 1998
End: 2005

Access Information

Security Class: Unclassified
Data Access Policy:

Open to everyone

Data Access Procedure:

Download Data fom provided links

Data Access Constraints:

None

Data Use Constraints:

Please cite appropriately.

Metadata Access Constraints:

none

Distribution Information

Distribution 1

CC ID: 567502
Start Date: 2017
End Date: Present
Download URL: https://data.nodc.noaa.gov/cgi-bin/iso?id=gov.noaa.nodc:0163192
Distributor: National Centers for Environmental Information - Silver Spring, Maryland (NCEI-MD) (2017 - Present)
Description:

Landing Page For The archive containing the data for this data set

Distribution 2

CC ID: 710659
Start Date: 2017
End Date: Present
Download URL: https://www.nodc.noaa.gov/archive/arc0111/0163192/1.1/data/0-data/24913
Distributor: National Centers for Environmental Information - Silver Spring, Maryland (NCEI-MD) (2017 - Present)
Description:

Landing page of the directory in the NCEI archive holding the data files of this dataset

Data Quality

Analytical Accuracy:

Analytical error associated with foraging ecology measurements was typically = 0.2‰.

Quantitation Limits:

Items found in the stomachs were measured for length (to nearest cm), and

weighed (wet weight, to nearest 0.001 g)

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
If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed:

This data is currently wavered under the current NOAA guidelines for relational databases.

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: 283211
Description:

Data was entered into the database by hand.

Process Contact: Carlson, John
Phone (Voice): 850-234-6541 x221
Email Address: John.Carlson@noaa.gov

Catalog Details

Catalog Item ID: 24913
Metadata Record Created By: Emily Harrell
Metadata Record Created: 2015-05-05 10:49+0000
Metadata Record Last Modified By: Lee M Weinberger
Metadata Record Last Modified: 2019-03-25 14:23+0000
Metadata Record Published: 2017-05-09
Owner Org: SEFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2018-05-10