Literaturdatenbank
Literaturdatenbank |
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Widrig, A. L., & Burke, R. L. (2006). A study of temperature-dependent sex determination in the diamondback terrapins of jamaica bay Hudson River Foundation.
Added by: Sarina Wunderlich (18 Nov 2012 17:47:14 UTC) |
| Resource type: Report/Documentation BibTeX citation key: Widrig2006 View all bibliographic details  |
Categories: General Keywords: Emydidae, Habitat = habitat, Malaclemys, Malaclemys terrapin, Nordamerika = North America, Schildkröten = turtles + tortoises Creators: Burke, Neider, Waldman, Widrig Publisher: Hudson River Foundation |
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| URLs http://www.hudsonriver.org |
| Abstract |
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Nesting ecology and temperature-dependent sex determination were studied in diamondback terrapins Malaclemys terrapin at the Jamaica Bay Wildlife Refuge in Queens, New York. In 2005, the nesting season occurred from June 7th to July 28th One hundred and seventy six females were documented coming onshore; 58% of these had been captured in previous years. Days with the largest number of terrapin captures usually followed days with long periods of rainfall. I placed temperature loggers in 136 nests, then protected the nests from predators and monitored them for hatching. Average nest depth was 149mm, mean clutch size was 13 eggs, and mean egg mass was 8.73g. The average time before the first hatchling emerged from the nests was 62 days, which is much sooner than previous studies have shown. Nest viability was also higher than previously documented; only 8.8% of nests failed to produce any hatchlings. Egg viability was lower than previously documented; only 63% of eggs produced hatchlings that emerged from the nest. Hatchling emergence chronology appeared to be dependent on temperature and rainfall, because more hatchlings emerged on very hot days and during or directIy after large amounts ofrainfall. Nest temperatures and hatchling sex ratios have yet to be analyzed and will not be discussed in this paper.
Added by: Sarina Wunderlich |