Casey Key Loggerheads 2007

Data provider
Mote Marine Laboratory
Originating data center
Satellite Tracking and Analysis Tool (STAT)
Project partner
Mote Marine Laboratory
www.mote.org/seaturtles
University of South Florida - College of Marine Science
http://www.marine.usf.edu/bio/fishlab/
SEATURTLE.ORG
CLS

Project sponsor or sponsor description
Two projects, the Acoustic Environment of Loggerhead Sea Turtles and the Determination of Intra-season Clutch Frequency for Loggerhead Turtles, were funded by a grant awarded from the Sea Turtle Grants Program. The Sea Turtle Grants Program is funded from proceeds from the sale of the Florida Sea Turtle License Plate. Learn more at
www.helpingseaturtles.org

Additional funding was provided by Longboat Key Turtle Watch and an anonymous donor, New Canaan Country School/Jeniam Foundation, Wooster School, Sarasota County Environmental Services, Virginia Miller, the Samek family on behalf of Kelly Samek, Curtis School, Comerica, Suntrust, and Community Foundation of Greater Lakeland.

Satellite tagging projects provide new data that address a variety of applied science contexts. This year's collaborative partners include Mote Marine Laboratory, University of South Florida, Univ. Georgia, Univ. Alabama-Birmingham, Duke Univ., West Connecticut State Univ., Florida A&M, Smithsonian, and National Geographic are all involved in various projects this nesting season.

A brief synopsis of the investigations includes:
Acoustic Study: The acoustic effects of undersea exploration and of vessel traffic are currently unknown for free-ranging sea turtles. The project will generate the first records of the acoustic environment of loggerhead sea turtles in inter-nesting habitats. Nesting females will be equipped with an acoustic bioprobe and a time-depth recorder before they swim away for an internesting interval. A recording tag will determine the acoustic environment experienced by turtles in the offshore environment. When a turtle returns to nest, the acoustic datalogger will be removed. The data gleaned and refinement of methodology developed from a nearshore study is a prerequisite before any studies are attempted on acoustic environments experienced by turtles in offshore realms. The project is a developmental step toward a more complete understanding of threats faced by sea turtles from boat traffic and opening Florida’s nearshore and offshore shelf to natural resource exploration.

Clutch frequency study: In deriving population density and abundance estimates for a species, adequate sampling regimes are needed to obtain non-biased population parameters. The sampling of sea turtle populations generally occurs at rookeries for that proportion of reproductive females nesting in a given year. Acknowledged problems inherent to adequately sampling these populations include tag loss, incomplete capture-recapture records, variation in remigration schedules, variable female reproductive output, and unrecorded nesting events occurring outside the sampling area. A serious consequence of estimating female fecundity is to overestimate populations, which would be detrimental to the aims of the U. S. Loggerhead Recovery Team.
To derive a more rigorous determination of clutch frequency, it is now possible to use satellite tags to evaluate how many nests a female may deposit within a season. The methods require that females be instrumented early in the nesting season and followed through the reminder of all internesting intervals until a final nest and then a post-reproductive migration. Although this is not the first time that loggerheads have been tagged in Florida nor in the Gulf of Mexico, all previous studies have generally tagged toward the end of the nesting season (July-August) and therefore would provide underestimates of annual fecundity.

This study proposes to determine clutch frequency of loggerheads at a primary nesting beach for loggerheads in the Gulf of Mexico. Satellite tags as well as standard Inconel flipper tags and PIT tags will be attached to nesting female loggerheads at either Casey Key or Manasota Key during May. Females will be tracked through the remainder of the nesting season to determine clutch frequency and site fidelity. Other valuable research byproducts related to conservation will be the determination of internesting movement, exposures levels to red tide, and other risks faced during the internesting and post-nesting movements. Pilot studies in 2005 and 2006 have previously determined the feasibility and logistics of such a study but were geared to tagging later in the season. By deploying tags early in May, a more accurate determination of clutch frequency will be obtained. These results would be comparable for other beaches in Florida, but are ideally suited to beaches that also conduct simultaneous night time tag patrols, such as on Manasota and Casey.

N/A

Visit STAT's project page for additional information.

Overview

Attributes described below represent those in the original dataset provided by the provider.
Only minimum required attributes are visible and downloadable online. Other attributes may be obtained upon provider's permission.

Attributes in dataset

Attribute (table column)	Description
prognum	Program number
tag_id	PTT ID
lc	Location class
iq	Quality indicator
dir1	Dir 1
nb_mes	Number of messages received
big_nb_mes	definition not provided
best_level	Best signal strength in dB
pass_duration	Pass duration in seconds
nopc	Number Of Plausibility Checks successful (from 0-4)
calcul_freq	Calculated frequency
altitude	Altitude used for location calculation
sensors	Sensors
species	Species name
project_id	STAT Project ID
lc_filter	Parameters to location filtering
speed_filter	Parameters to speed filtering
distance_filter	Parameters to distance filtering
topo_filter	Parameters to topo filtering
time_filter	Parameters to time filtering
angle_filter	Parameters to angle filtering
life_stage	Life stage of the animal
gender	Gender of the animal
wetdry	Wet or dry
wetdry_filter	Parameters to Wet or dry filterint
obs_datetime	Date and time (local time zone)
timezone_h	Time difference from UTC