Ontogenetic and Site-Related Trends in the Diet of the Atlantic Sharpnose Shark Rhizoprionodon Terraenovae From the Northeast Gulf Of Mexico
Southeast Fisheries Science Center
Document
(DOC)
| ID: 46082
| Published / External
Created: 2017-05-17
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Last Modified: 2022-08-09
Data Set (DS) | ID: 24911
ID: 46082
Document (DOC)
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* » Title | Ontogenetic and Site-Related Trends in the Diet of the Atlantic Sharpnose Shark Rhizoprionodon Terraenovae From the Northeast Gulf Of Mexico |
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* Status | Completed |
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• Publication Date | 2006-03-01 |
* » Abstract |
Atlantic sharpnose shark Rhizoprionodon terraenovae (Richardson, 1836) diet is described from Crooked Island Sound, an embayment of the northeast Gulf of Mexico. Diet was assessed by life-stage and quantified using six indices: percent by number, percent by weight, frequency of occurrence, the index of relative importance (IRI), IRI expressed on a percent basis (%IRI), and %IRI based on prey category (%IRIPC). Young-of-the-year (YOY) sharks (n = 56 examined, 37 non-empty stomachs) fed on a mix of teleosts (mostly clupeids, 44.6 %IRIPC) and invertebrates (combined, 25.1 %IRIPC), juveniles (n = 185 examined, 118 non-empty stomachs) on sciaenids (40.7 %IRIPC) and clupeids (37.8 %IRIPC), and mature sharks (n = 105 examined, 67 non-empty stomachs) on sciaenids (71.4 %IRIPC). Differences in diet by site and ontogeny were tested by comparing the diet from Crooked Island Sound with previous published data from areas off St. Vincent Island in Apalachicola Bay, an adjacent estuary. Stomach contents were also used to expand on published prey sizepredator size information. Spearman correlation analysis, Pianka’s overlap values, null-model simulations, and simple correspondence analysis showed that life stage diet differed within and between sites. Three of four size-selectivity tests showed negative size selection. Absolute prey size and the range in absolute prey size increased with increasing shark size. Atlantic sharpnose shark diet was dominated by prey that were < 40% of shark length; however, 69% of prey items were 21%–40% of shark length while 26% were = 20% of shark length. Variations in diet composition within and between the two sites are likely due to differences in shark size, overall habitat structure, and availability of potential prey species. |
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BULLETIN OF MARINE SCIENCE, 78(2): 287–307, 2006 |
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* » Date Effective From | 2006-03-01 |
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Person | Bethea, Dana M |
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263 13th Avenue South St Petersberg, FL 33701 |
Email Address | Dana.Bethea@noaa.gov |
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* » Support Role | Co-Author |
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* » Date Effective From | 2006-03-01 |
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Person | Carlson, John |
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3500 Delwood Beach Road Panama City, FL 32408 |
Email Address | John.Carlson@noaa.gov |
Phone | 850-234-6541 x221 |
Fax | 850-235-3559 |
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URL | http://www.ingentaconnect.com/contentone/umrsmas/bullmar/2006/00000078/00000002/art00005 |
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Catalog Details
Catalog Item ID | 46082 |
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Metadata Record Created By | Lee M Weinberger |
Metadata Record Created | 2017-05-17 15:54+0000 |
Metadata Record Last Modified By | SysAdmin InPortAdmin |
» Metadata Record Last Modified | 2022-08-09 17:11+0000 |
Metadata Record Published | 2021-10-19 |
Owner Org | SEFSC |
Metadata Publication Status | Published Externally |
Do Not Publish? | N |
Metadata Workflow State | Published / External |
Metadata Last Review Date | 2021-10-19 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2022-10-19 |
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