Movement patterns of Kemp’s ridley sea turtles in the northwestern Gulf of Mexico 2004-2007
Erin Seney and Andre Landry, Sea Turtle & Fisheries Ecology Research Laboratory, Department of Marine Biology, Texas A&M University at Galveston
Seney, E. 2013. Movement patterns of Kemp’s ridley sea turtles in the northwestern Gulf of Mexico 2004-2007. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/960) on yyyy-mm-dd.
Halpin, P.N., A.J. Read, E. Fujioka, B.D. Best, B. Donnelly, L.J. Hazen, C. Kot, K. Urian, E. LaBrecque, A. Dimatteo, J. Cleary, C. Good, L.B. Crowder, and K.D. Hyrenbach. 2009. OBIS-SEAMAP: The world data center for marine mammal, sea bird, and sea turtle distributions. Oceanography. 22(2):104-115.
The Kemp's ridley sea turtle Lepidochelys kempii is recovering from declines that reduced nesting from a single-day estimate of 10000 to 40000 females in 1947 to <300 during the entire 1985 nesting season. Although beach monitoring is crucial to estimating nesting population size and activity, in-water data are essential for understanding population dynamics, evaluating management strategies, and ensuring the species’ continued recovery. Fifteen immature and 7 adult female ridleys were fitted with platform terminal transmitters and released off the upper Texas coast during 2004 through 2007. Immature individuals were tracked primarily during warmer months and exhibited preferences for tidal passes, bays, coastal lakes, and nearshore waters, although movement patterns varied among years. Females tracked during their inter-nesting intervals remained in the vicinity of the upper Texas coast and, upon entering the post-nesting stage, moved eastward along the 20 m isobath to foraging areas offshore of central Louisiana. Satellite telemetry indicated that inshore and continental shelf waters of the northwestern Gulf of Mexico serve as developmental, migratory, inter-nesting, and post-nesting habitat for the Kemp’s ridley. Projected population growth will likely lead to increased use of the northwestern Gulf by the species and more frequent encounters with human activities. The extent of such anthropogenic interactions and need for mitigation measures should be examined and considered by natural resource managers to facilitate continued recovery of this and other sea turtle species in the Gulf of Mexico. Likewise, research efforts should be continued to better understand seasonal in-water distributions, abundances, population dynamics, and mortality risks to all life history stages.
The following research objectives were identified:
(1) to characterize movements of benthic-stage im mature and adult female Kemp’s ridleys in the northwestern Gulf of Mexico; and
(2) to identify Kemp's ridley migration patterns and foraging grounds in the northwestern Gulf of Mexico.
Seney, E.E. and A.M. Landry. 2011. Movement patterns of immature and adult female Kemp’s ridley sea turtles in the northwestern Gulf of Mexico. Marine Ecology Progress Series. 440:241-254.
Attributes described below represent those in the original dataset provided by the provider.
The dataset contains information necessary to locate the species sightings observed in the survey. The structure of the dataset was defined by NOAA Southeast Fisheries Science Center. Note that the dataset is a subset of the larger, complete dataset collected in the survey which includes environmental information. The columns before LineNo are applied to the shapefile only. The following information is not included in the dataset but will be found in the master data. For details, please contact NOAA Southeast Fisheries Science Center. Track; Speed; GPS Status; Observers; Wind direction; Weather; Sea state; Swell; Visibility; Turbidity; Sunlight; Water depth; Water color; Water temperature; Sighting angle; Effort status.
Attributes in dataset provided
|Rays and sharks||0|
|Latitude||28.27 - 30.05|
|Longitude||-96.54 - -90.35|
|Coord. prec.||3 decimal digits|
|Data type||Telemetry location|
|Tracklines||YES (ID: 961)|
|Sharing policy||CC-BY-NC (Minimum)|
|Also availalbe from||iOBIS|
|See metadata in static HTML|
|See metadata in FGDC XML|
|See download history / statistics|