(RoSTI) ANNUAL REPORT 2003 - WIDECAST

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RoSTI Annual Report 2003 Franklin, Byrne and Eckert (2004) this initial season tagging was only undertaken on Rosalie Beach patrols, with the exception of the juvenile Green turtle stranded on Castle Bruce and later released by RoSTI staff at Rosalie Beach. Most turtles were tagged during “tamping” (=nest covering stages), and as a result it is definitely known that of the tagged females approximately 37.5% (a total of six) produced confirmed nests at the time of tagging. An equal number were positively identified as having not nested and were intercepted and tagged as they returned to the sea. Two tagged females (12.5%) were documented as having “suspected nests” after an examination of the nesting area. Chart 3. 2003 Tagging Dates at Rosalie Bay. [LB=Leatherback; HB=Hawksbill; G=Green Turtle] Number Date Species LB HB G 1 15-May 1 2 16-May 1 3 22-May 1 4 26-May 1 5 05-Jun 1 6 14-Jun 1 7 17-Jun 1 8 10-July 1 9 19-July 1 10 19-Aug 1 11 20-Aug 1 12 27-Aug 1 13 11-Sep 1 14 23-Sep 1 15 23-Sep 1 16 01-Oct 1 Totals 7 4 5 Twenty percent of the turtle activities resulted in the application of identification tags. Of those turtles tagged, three (19%) of them were documented returning to nest again! Returning turtles included a Leatherback tagged on 16 May 2003 at Rosalie, and then killed at La Plaine beach 10 days later. Measurements- Of the tagged turtles, the average Curved Carapace Length (CCL) and Curved Carapace Width (CCW) of adult female Leatherbacks was 152.50 cm and 120.50 cm, respectively. The maximum CCL was 165.0 cm and the minimum was 137.0 cm, for a range of 28.0 cm. The maximum CCW was 127.0 cm and the minimum was 112.0 cm, for a range of 15.0 cm. The average CCL and CCW measurement for Hawksbills was 90.66 cm and 82.66 cm, respectively. The largest Hawksbill CCL was 95.0 cm and the smallest was 88.0 cm, producing a range of 7.0 cm. There was a range of just 3.0 cm between the maximum recorded CCW of 84.0 cm and the minimum measurement of 81.0 cm. 16
RoSTI Annual Report 2003 Franklin, Byrne and Eckert (2004) The average size for Green turtles encountered in 2003 was 86.3 cm in length (CCL) and 72.4 in width (CCW), including both nesting adults and a tagged juvenile Green turtle which measured 30.0 cm CCL and 26.0 cm CCW. The maximum dimensions for Green turtles encountered on the nesting beach were 107.0 cm CCL and 95.0 cm CCW. Seasonality- A cursory glance at the data on tagging records, as well as the overall distribution of nesting at Rosalie Bay, reveals what may be a seasonal pattern. Leatherbacks nest mainly during the first half of the year and Green turtles mainly during the latter half of the year, with low density Hawksbill nesting extending over the longest period of time. For a rather brief period (June-July, see Chart 3) all three species were actively nesting; and this is broadly reflective of information gathered in more intensive studies in other Caribbean range states. As data accumulate over the years, more precise information on the seasonality of nesting by the various species will surely accrue. Geographic analysis- As noted in Table 1, Rosalie Beach had a total of 39 documented activities (49.4%) in comparison to La Plaine Beach, with 35 (44.3%) documented activities. Despite the close proximity of the two survey beaches, the pattern of nesting differed between them. For example, 60% of the nesting activity at La Plaine Beach was by Hawksbill turtles, almost twice the frequency evident on Rosalie Beach. Conversely, La Plaine received significantly fewer Leatherback nests compared with Rosalie (Table 4; Chart 4). Table 4. Documented Sea Turtle Activity by Species by Location in Rosalie Bay, 2003. Rosalie Beach La Plaine Beach Sea Turtle Species % Number % Number Leatherback 46.15 18 34.29 12 (*) Hawksbill 33.33 13 60.00 21 Green 20.51 08 05.71 02 Total 100.00 39 100.00 35 (*) Table 4 note: Including 3 (25%) egg-bearing leatherbacks killed illegally when they came ashore to nest at La Plaine Beach. 17
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(RoSTI) ANNUAL REPORT 2003 - WIDECAST

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