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  • Cucurbita pepo  (1)
  • Nesomyinae  (1)
  • Springer  (2)
  • American Meteorological Society
  • Blackwell Publishing Ltd
  • 1990-1994  (2)
Collection
Keywords
Publisher
  • Springer  (2)
  • American Meteorological Society
  • Blackwell Publishing Ltd
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Effects of genotype on pollen performance in Cucurbita pepo (1991)
    Springer
    Sexual plant reproduction 4 (1991), S. 208-214 
    Details
    ISSN: 1432-2145
    Keywords: Cucurbita pepo ; Pollen competition ; Geno-type ; Non-random fertilization ; Pollen performance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary This study examines the assumption of the pollen competition hypothesis that genetic differences among microgametophytes lead to differences in pollen performance and result in non-random fertilization. In addition, we examined the assumption that pollen performance is genetically correlated with sporophyte vigor due to an overlap in gene expression between the two stages of the life cycle. The results from a pollen mixture experiment in which two cultivars of common zucchini were used show that the ability to sire seeds is nonrandom with respect to the cultivar of the pollen donor plant. The proportion of the progeny sired by the two cultivars is not independent of the region of the fruit where the seeds are produced. The progeny sired by the yellow cultivar outperformed the progeny sired by the green cultivar in a greenhouse study. In addition, the progeny sired by the yellow cultivar from the stylar region of the fruit germinated faster and had more leaf area than the progeny sired by the same cultivar from the peduncular end of the fruit. Thus, the most vigorous progeny are obtained from the stylar region of the fruit where the ovules are fertilized by the most vigorous microgametophytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190007
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The small mammal fauna of Réserve Spéciale d'Analamazaotra, Madagascar: the effects of human disturbance on endemic species diversity (1993)
    Springer
    Biodiversity and conservation 2 (1993), S. 603-615 
    Details
    ISSN: 1572-9710
    Keywords: conservation and tourism ; habitat disturbance ; mid-altitude rain forest ; Nesomyinae ; Tenrecidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: This study represents the first long-term small mammal survey of the mid-altitude rain forest reserve of Analamazaotra, Madagascar. Twenty-three visits were made to the reserve between April 1988 and May 1990. Live-trapping with Sherman and pitfall traps at four sites subjected to varying levels of human disturbance revealed the presence of seven endemic tenrec species, three endemic rodent species and an introduced rat. Greater species richness was demonstrated at the most undisturbed site, though individual species abundance was reduced. Human disturbance associated with tourism was correlated with a decrease in endemic species richness and an increase in abundance of introduced rats. Forest subjected to infrequent logging by local people exhibited an intermediate level of species richness. It is recommended that core areas of the reserve be left undisturbed in order to preserve small mammal species diversity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00051961
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    Paper (German National Licenses)
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