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MULTIANNUAL SAND TEMPERATURESCOLLECTED AT CAPE CANAVERALFLORIDA AND RELATIONSHIPS TO
CENTRAL FLORIDA SEA TURTLE SEX
RATIOS
Jane Provancha and Michael Corsello.DYN-2 Kennedy Space Center, FL 32899
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MULTIANNUAL SAND TEMPERATURESFLORIDA AND RELATIONSHIPS TO
TURTLE SEX
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COLLECTED AT CAPE CANAVERALCENTRAL FLORIDA SEA
RATIOS
Jane Provancha and Michael Corsello
DYN-2 Kennedy Space Center, FL 32899
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ABSTRACT
Sand temperature data were collected at middlenest depth for C. caretta (30 cm) at Cape Canaveral,from 1986-1995. These data were used to determineannual temperature variability over the decade inrelation to a previous five-year study which indicateda strong female bias (Mrosovsky and Provancha1993). Seasonal mean sand temperatures rangedfrom 29.6 to 31.3 (oC), with most biweekly meansabove the pivotal temperature for Caretta (29.4 oC).Annual variation during the decade was notstatistically significant, however, the 1988 and 1991nest seasons had lowest temperatures, closest tothe pivotal.
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INTRODUCTION
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Study Site AtCape Canaveral Florida
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Study Site AtCape Canaveral Florida
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Study Site Sand temperature data from fixed stakesalong transects: manual intermittent &automated continuous collections.
Manual : YSI Model 33 with soilprobes accuracy +/- 0.25 oCAutomatic: Hydrolab Datasonde(model 2020, accuracy +/- 0.1 oC ), GrantSquirrel Meter (accuracy +/- 0.2 oC ) andLi-Cor 1000 with soil probes (accuracy+/- 0.5 oC) .
Nest data were collected by biologistsduring daily crawl surveys of the Capeand Kennedy Space Center beaches.
METHODS
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METHODS contd
The temperatures reported here were collected from probesburied at 30 cm depths to represent mean depths forCaretta nests.
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RESULTS
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DATE 86 87 88 89 90 91 92 93 94 95
26
28 24
29 28 27 30 29 28
31 30 28 30 31 30 29 32 30
30 30 29 31 31 31 29 30 30 28
31 31 30 31 31 30 32 32 32 31
32 32 31 31 32 33 32 33 30 30
32 32 29 31 31 32 31 33 30 31
31 31 27 31 31 29 31 29 30
31 29 31 31 31 29 30 31
30 30 31 29 30
25 27 29
April 16-30
May 1-15May 16-31
June 1-15
June 16-30
July 1-16July 17-31
Aug 1-16
Aug 17-31
Sept 1-15Sept 16-30
Oct 1-16
Oct 17-31 24
71% 77 % 76% 64% 73% 74% 76% 78% 76% 73%ercent of nests laid inmid-season box above
Temperature data averaged for biweekly periods in each nesting season
}
Midseo
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MeS
Tmpaue
22
24
26
28
30
32
34
1988
19861987
1989
1990
19911992199319941995
Plot 1 100% Female
Plot 1 50% Distribution
Plot 1 100% Male
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0.3
0.20.1
0.0
-0.1-0.2
-0.3-0.4-0.5
1870 1890 1910 1930 1950 1970 1990YEAR
Temperature(oC)
Annual Change in Global Land/Ocean Temperature (oC) from1856-1994. (Modified from NOAA, National Climatic Data Center.)
Period of our study
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0.3
0.20.1
0.0
-0.1-0.2-0.3
-0.4-0.5
1870 1890 1910 1930 1950 1970 1990YEAR
Temperature(oC)
Annual Change in Global Land/Ocean Temperature (oC) from1856-1994. (Modified from NOAA, National Climatic Data Center.)Period of our study
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CONCLUSIONS:
(Monastersky 1996)
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NASA- Kennedy Space Center, Ecological Program,N. Mrosovsky played a major role in the original design andencouragement of this project. R. Hall, M. Hensley, H.Klienschmidt, P. Makurjee, C. McMillan, , E. Possardt, R. Roane,D. Turner, R. Theimann, K. Whaley/Merritt Island National Wildlife
Refuge provided field assistance.
Mrosovsky, N. and J. Provancha. 1992. Sex ratio of logger head sea turtles: data andestimates from a 5-year study. Canadian Journal Zoology 70: 530-538.
Mrosovsky, N. and J.A. Provancha. 1989. Sex ratio of loggerhead sea turtles hatching on aFlorida beach. Canadian Journal Zoology 69:2533-2539.
Monastersky, R. 1996. 1996: Year of warmth and weather reversals. Science News, Vol.151, p38.
ACKNOWLEDGMENTS
Citations