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  • Nature Publishing Group  (3)
  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 342 (1989), S. 625-625 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR—In asking "why do plants produce so many more ovules than seeds", Charles-worth1 and Wiens et al.2 have addressed an important issue. Wiens et al. attribute the high level of ovule abortion observed in many plants to genetic load, a factor also emphasized by Charlesworth in her ...
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 352 (1991), S. 204-205 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DESPITE worldwide concern, the rate of tropical deforestation is accelerating and in 1989 was almost twice that in 1979. (Norman Myers, Deforestation Rates in Tropical Forests and their Climatic Im-plications, Friends of the Earth, Lon-don). The pace of change is alarming, and only a small fraction ...
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 383 (1996), S. 398-399 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR á€" Canopy trees, the main structural elements of tropical rain forests, typically occur at the density of one adult or less per hectare1'3. Because these trees are strongly outcrossed4"6, their populations are expected to cover large areas of hundreds of square kilometres. ...
    Type of Medium: Electronic Resource
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