Literaturdatenbank
Literaturdatenbank |
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Schneeweiß, N. (2004). Climatic impact on reproductive success of emys orbicularis at the northwestern border of the species’ range (germany). Biologia (Bratislava), 59(Suppl. 14), 131–137.
Added by: Admin (06 Jan 2014 18:23:09 UTC) |
| Resource type: Journal Article BibTeX citation key: anon2004j View all bibliographic details  |
Categories: General Keywords: Emydidae, Emys orbicularis, Europa - Europe, Habitat - habitat, Schildkröten - turtles + tortoises, Zeitigung - incubation Creators: Schneeweiß Collection: Biologia (Bratislava) |
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| Abstract |
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Egg-laying dates, hatching success and survival rates of Emys orbicularis hatchlings overwintering in nests were correlated with climatic data (soil temperatures, sunshine hours) for Northeast Germany. An empirically rooted mathematical model was designed to predict the impact of temperature on embryonic development. For four different areas in Brandenburg the suitability of annual incubation conditions was assessed over 40 years, based on the correlation between soil temperature and sunshine duration. In the longterm, the more continental eastern part of Brandenburg has more favourable incubation conditions (55% of 40 years) than the more Atlantic western part (32% of 40 years). Females predominate in wild populations despite temperatures rarely exceeding 28.5◦C in natural nests. This suggests a genotypic sex determination under natural incubation conditions.
Added by: Admin |