منابع مشابه
Climate warming and environmental sex determination in tuatara: the last of the Sphenodontians?
Consider the plight of tuatara—reptiles seemingly preadapted for extinction. Today only two species survive— paltry remnants of a lineage (order Sphenodontia) that originated over 200 Myr ago (figure 1). They currently live only on some small islands off New Zealand. Their populations are small, sometimes male-biased, and genetically homogeneous (Hay et al. 2003). Moreover, tuatara take at leas...
متن کاملTuatara
Figure 1. Young adult tuatara from North Brother Island with a regenerating tail (Photo by Alison Cree). What is a tuatara? The tuatara is a modern reptile found only in New Zealand (Figure 1). Although it superficially looks like a mediumsized lizard it is in fact the only living member of the Rhynchocephalia, a group of animals that were successful, globally distributed, and ecologically dive...
متن کاملPredicting the fate of a living fossil: how will global warming affect sex determination and hatching phenology in tuatara?
How will climate change affect species' reproduction and subsequent survival? In many egg-laying reptiles, the sex of offspring is determined by the temperature experienced during a critical period of embryonic development (temperature-dependent sex determination, TSD). Increasing air temperatures are likely to skew offspring sex ratios in the absence of evolutionary or plastic adaptation, henc...
متن کاملWalls: Feeding of Tuatara
Food habits of the tuatara (Sphenodon punctatus) on Stephens Island, in north-western Cook Strait, were studied by field observations and faecal analysis. The tuatara is a selective predator, feeding on a wide range of small animals, mainly large insects. Its diet shows seasonal changes and habitat differences, related to local conditions: the coastal broadleaf forest habitat, which predominate...
متن کاملSex determination
struggled for years with parasites that evolve resistance to commonly used drugs. Why should it be any different in animals? Yet as far as we know, no study has ever looked at whether parasites become resistant to the chemicals in the plants that hosts use for protection, though in the Drosophila example referenced above, ethanol did not negatively affect larvae of specialist wasps as strongly ...
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ژورنال
عنوان ژورنال: Nature
سال: 1995
ISSN: 0028-0836,1476-4687
DOI: 10.1038/375543a0