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Spatial Dynamics of Sea Turtle Abundance and Shrimping Intensity in the U.S. Gulf of Mexico

Conservation ecology, 2000, Vol.4 (1), p.15, Article art15 [Peer Reviewed Journal]

Copyright © 2000 by The Resilience Alliance ;ISSN: 1195-5449 ;ISSN: 1708-3087 ;EISSN: 1195-5449 ;EISSN: 1708-3087 ;DOI: 10.5751/es-00181-040115

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  • Title:
    Spatial Dynamics of Sea Turtle Abundance and Shrimping Intensity in the U.S. Gulf of Mexico
  • Author: McDaniel, Carrie J. ; Crowder, Larry B. ; Priddy, Jeffery A.
  • Subjects: Chelonia ; Coasts ; Conservation biology ; Decapoda ; density estimates ; endangered species ; Fisheries science ; GIS ; Gulf of Mexico ; Gulfs ; Kemp's ridley ; Lepidochelys kempi ; management ; Mortality ; Ocean fisheries ; Sea turtles ; Sea water ; Shrimp ; shrimp fishing ; spatial dynamics ; strip transect methods ; Turtles ; USA
  • Is Part Of: Conservation ecology, 2000, Vol.4 (1), p.15, Article art15
  • Description: In order to examine the scientific feasibility of area closures for sea turtle protection, we determined the spatial dynamics of sea turtles for the U.S. Gulf of Mexico by analyzing National Marine Fisheries Service (NMFS) aerial survey data in September, October, and November of 1992, 1993, and 1994. Turtle sightings were grouped into depth zones and NMFS fishery statistical zones, and strip transect methods were used to estimate the relative abundance of sea turtles in each subzone. Average shrimping intensity was calculated for each subzone for all months of 1992, 1993, and 1994, as well as for the months and locations of the aerial survey. The spatial overlap of sea turtle abundance and shrimping intensity suggested regions where interactions are likely to occur. Sea turtles were observed at much higher rates along the coast of Florida than in the Western Gulf; the highest density of sea turtles was observed in the Florida Keys region (0.525 turtles/km²). Shrimping intensity was highest in the Western Gulf along the coast of Texas and Louisiana, for both annual and fall estimates. Among alternative management scenarios, area closures in conjunction with continued Turtle Excluder Device (TED) requirements would probably best prevent sea turtles from future extinction. By implementing shrimping closures off of South Padre Island, Texas, a potential second nesting population of Kemp's ridleys (Lepidochelys kempi) could be protected. Closing waters where shrimping intensity is low and sea turtle abundance is high (e.g., South Florida waters) would protect sea turtles without economically impacting a large number of shrimpers.
  • Publisher: Resilience Alliance
  • Language: English
  • Identifier: ISSN: 1195-5449
    ISSN: 1708-3087
    EISSN: 1195-5449
    EISSN: 1708-3087
    DOI: 10.5751/es-00181-040115
  • Source: TestCollectionTL3OpenAccess
    Alma/SFX Local Collection
    Digital Library of the Commons
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