Multi Annual Sand Temperatures

8/9/2019 Multi Annual Sand Temperatures

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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

Documents

Multi Annual Sand Temperatures