A Comparison of the Foraging Ecology and Bioenergetics of the Early Life-Stages of Two Sympatric Hammerhead Sharks
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Summary
Juvenile scalloped hammerhead sharks, Sphyrna lewini (Griffith and Smith, 1834), were collected in northwest Florida to examine foraging ecology, bioenergetics, and trophic level [30–60 cm fork length (FL); mean FL= 41.5 cm; N = 196]. Diet analysis was performed using single and compound measures of prey quantity, as well as seven broad diet categories. Diet composition and estimated daily ration were compared to previously published information on bonnethead sharks, Sphyrna tiburo (Linnaeus, 1758). 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 juvenile S. tiburo has been documented to feed mostly on crustaceans and plant material. Plant material contributed little to the diet of S. lewini. Estimated daily ration was significantly lower for S. lewini than for S. tiburo, regardless of whether plant material was included in the model. 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 d15N values and significantly lower d13C values than S. tiburo, consistent with the difference observed in calculated trophic level. These results provide evidence that juvenile hammerhead species coexist in coastal northwest Florida by feeding at separate trophic levels.
Document Information
Document Type
Journal article
Document Format
Acrobat Portable Document Format
Publication Date
2011-10-01
Contact Information
No contact information is available for this record.
Please contact the owner organization (SEFSC) for inquiries on this record.
Item Identification
| Title: | A Comparison of the Foraging Ecology and Bioenergetics of the Early Life-Stages of Two Sympatric Hammerhead Sharks |
|---|---|
| Status: | Completed |
| Publication Date: | 2011-10-01 |
| Abstract: |
Juvenile scalloped hammerhead sharks, Sphyrna lewini (Griffith and Smith, 1834), were collected in northwest Florida to examine foraging ecology, bioenergetics, and trophic level [30–60 cm fork length (FL); mean FL= 41.5 cm; N = 196]. Diet analysis was performed using single and compound measures of prey quantity, as well as seven broad diet categories. Diet composition and estimated daily ration were compared to previously published information on bonnethead sharks, Sphyrna tiburo (Linnaeus, 1758). 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 juvenile S. tiburo has been documented to feed mostly on crustaceans and plant material. Plant material contributed little to the diet of S. lewini. Estimated daily ration was significantly lower for S. lewini than for S. tiburo, regardless of whether plant material was included in the model. 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 d15N values and significantly lower d13C values than S. tiburo, consistent with the difference observed in calculated trophic level. These results provide evidence that juvenile hammerhead species coexist in coastal northwest Florida by feeding at separate trophic levels. |
| Other Citation Details: |
DOI: https://doi.org/10.5343/bms.2010.1047 Bethea, D.M., Carlson, J.K., Hollensead, L.D., Papastamatiou, Y.P. and Graham, B.S., 2011. A comparison of the foraging ecology and bioenergetics of the early life-stages of two sympatric hammerhead sharks. Bulletin of Marine Science, 87(4), pp.873-889. |
Keywords
Theme Keywords
| Thesaurus | Keyword |
|---|---|
| UNCONTROLLED | |
| None | diet |
| None | foraging ecology |
| None | resource partitioning |
| None | S. lewini |
| None | S. tiburo |
| None | scalloped hammerhead sharks |
Temporal Keywords
| Thesaurus | Keyword |
|---|---|
| UNCONTROLLED | |
| None | 1998-2005 |
Spatial Keywords
| Thesaurus | Keyword |
|---|---|
| UNCONTROLLED | |
| None | Crooked Island Sound |
| None | gulf of mexico |
| None | northwest Florida |
| None | St. Vincent Island |
Document Information
| Document Type: | Journal article |
|---|---|
| Format: | Acrobat Portable Document Format |
| Status Code: | Published |
Support Roles
Author
| Date Effective From: | 2011 |
|---|---|
| Date Effective To: | |
| Contact (Person): | Bethea, Dana M |
| Address: |
263 13th Avenue South St Petersberg, FL 33701 |
| Email Address: | Dana.Bethea@noaa.gov |
| Contact Instructions: |
No longer works for NMFS Panama City Lab |
Co-Author
| Date Effective From: | 2011 |
|---|---|
| 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 |
|---|---|
| Data Access Policy: |
Open to everyone |
| Data Access Procedure: |
Download from provided |
| Data Access Constraints: |
None |
| Data Use Constraints: |
Data not for use in litigation. cite as Bethea, D.M., Carlson, J.K., Hollensead, L.D., Papastamatiou, Y.P. and Graham, B.S., 2011. A comparison of the foraging ecology and bioenergetics of the early life-stages of two sympatric hammerhead sharks. Bulletin of Marine Science, 87(4), pp.873-889 |
URLs
URL 1
| URL: | http://www.ingentaconnect.com/contentone/umrsmas/bullmar/2011/00000087/00000004/art00009 |
|---|---|
| URL Type: |
Online Resource
|
| Description: |
Landing Page To journal article |
URL 2
| URL: | https://doi.org/10.5343/bms.2010.1047 |
|---|---|
| URL Type: |
Online Resource
|
| Description: |
Landing Page Through DOI resolution |
Catalog Details
| Catalog Item ID: | 45944 |
|---|---|
| GUID: | gov.noaa.nmfs.inport:45944 |
| Metadata Record Created By: | Lee M Weinberger |
| Metadata Record Created: | 2017-05-01 22:01+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 |