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Tortoise Nest Temperature Data Collection

Discussion in 'Advanced Tortoise Topics' started by Tom, Dec 14, 2018.

  1. Markw84

    Markw84 Well-Known Member 5 Year Member

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    Carol, are we looking south in this photo? The wall of the building next to the nest facing east?
  2. CarolM

    CarolM Well-Known Member

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    The stones are now off. Sorry didn't think about that.
  3. CarolM

    CarolM Well-Known Member

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    Had to get my son to help. 20190104_191551.jpeg
  4. Olddog

    Olddog Well-Known Member

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    Possibly you may find this article of intrest re nest temperatures measurements in Leatherback Turtles:

    The authors list the temperature data loggers utilized in thier study and details of their study setup.
    Measurement of Metabolic heat during the final third of the incubation period was associated with the number of eggs per nest.


    Incubation temperatures, sex ratio and hatching success of leatherback turtles (Dermochelys coriacea)
    in two protected hatcheries on the central Mexican coast of the Eastern Tropical Pacific Ocean
    J. García–Grajales, J. F. Meraz Hernando, J. L. Arcos García, E. Ramírez Fuentes


    Animal Biodiversity and Conservation 42.1 (2019)

    Abstract

    Incubation temperatures, sex ratio and hatching success of leatherback turtles (Dermochelys coriacea) in two protected hatcheries on the central Mexican coast of the Eastern Tropical Pacific Ocean. Incubation temperatures, sex ratio and hatching success of leatherback turtles have received little attention in conservation programs in Mexico. This study was carried out from October 2014 to May 2017 in two enclosed hatchery sites. To determine temperature parametersin the nest chamber environment and their variation during the incubation period, we placed data loggers in the centre of the egg mass in relocated nests. We then buried other data loggers in the sand near the relocated nests, inside and outside the hatchery. A total of 46 nests were examined over three nesting seasons. Mean nest temperature showed no statistical difference between nests in either the San Juan Chacahua hatchery or in the Palmarito hatchery nests. The mean sex ratio based on average temperature during the middle third of incubation duration was 96.3% skewed to female production. Hatching success in both San Juan Chacahua and Palmarito was high. Our findings support the common pattern of a female–dominated leatherback turtle sex ratio. Furthermore, hatching success rates in the shade–cloth hatchery were higher than those in the natural nests observed in other populations.

  5. Markw84

    Markw84 Well-Known Member 5 Year Member

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    @CarolM Have you received the data loggers yet? Last I saw they left Johannesburg on the 6th. Let me know when you get them. I sent you 3.

    I also am working with the park warden for the largest Burmese Star facility in Myanmar. She has 3170 Burmese in her care right now. I am working on getting her some data loggers as well. She never thought that necessary as they just naturally hatch!, but I am trying to convince her!!
    mrnewberry, CarolM and KarenSoCal like this.
  6. CarolM

    CarolM Well-Known Member

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    Sorry Mark, just checked. Still nothing.
  7. Markw84

    Markw84 Well-Known Member 5 Year Member

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    We got the 2 week update from Carol on the C angulata nest we are monitoring. Here is the updated chart. I have added rainfall data from her town weather station as I like to track rainfall events when I am looking at nest data. I have charts like this for the past year+ on locations in the middle of their prime natural habitats for G platynota, S p pardalis, and A radiata. I don't have in situ nest data - so hopefully as we collect data from nests we can extrapolate what nests would be with those conditions. I also graph cloud cover in all my other data set graphs, but did not here with Carol's.

    Interesting to me that we are now 3 weeks past summer solstice and the nest temperature for C angulata has only briefly peaked above 80° for a few hours on a handful of days. The average nest temperature is running about 75°!

    Nest temp is red. Air temp is grey. Rainfall -blue- to show graphically on chart is X100 and is for a 3 hour period. So a reading of 10 on the chart for rainfall is 0.1 " of rain in that 3 hour period. This allow rain events to be readily seen. I do this on all my weather charts when used to predict nest temps and hatch dates, etc.

    C angulata nest jan 14.jpg
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  8. CarolM

    CarolM Well-Known Member

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    Such a pity that I cannot get one in an actual nest, as it would be very interesting to see if the temps spike closer to hatching dates. Thank you Mark for putting it all together.
  9. Markw84

    Markw84 Well-Known Member 5 Year Member

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    We do have a nest within centimeters of this location. This will tell us a lot!! I am already amazed at how low mid summer temperatures are in the "nest".
    CarolM likes this.
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