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  • 1
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    Pennsylvania's Defiance of the United States (1908)
    New York, N.Y. : Periodicals Archive Online (PAO)
    Harper's. 117:701 (1908:Oct.) 670 
    Details
    ISSN: 0017-789X
    Topics: General, Interdisciplinary
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:5128-1908-117-01-000004
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  • 2
    Electronic Resource
    Electronic Resource
    Sympatric pest (1989)
    [s.l.] : Nature Publishing Group
    Nature 338 (1989), S. 304-304 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR—Three recent letters1'3 and an accompanying News and Views article4 concern the fascinating story of how, in the past 200 years, the native American fly Rhagoletis pomonella has apparently moved from its native hawthorne host to become an important pest of commercial apple ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/338304a0
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  • 3
    Electronic Resource
    Electronic Resource
    The Galapagos that were (1992)
    [s.l.] : Nature Publishing Group
    Nature 355 (1992), S. 202-203 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] EXCITING new geological evidence, described by Christie and colleagues on page 246 of this issue1, shows that a series of drowned islands (seamounts) occurs east of the existing Galapagos islands. The oldest seamount, 10 million years old and 2,500 m deep, lies 700 km east of an ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/355202a0
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  • 4
    Electronic Resource
    Electronic Resource
    Ancient Chromosomal Polymorphism in Hawaiian Drosophila (1973)
    [s.l.] : Nature Publishing Group
    Nature 241 (1973), S. 200-202 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Geographical distribution and relevant chromosomal conditions in fourteen large Drosophila species found on four southeastern Hawaiian islands. For details see text. After an inversion has occurred, there exist two alternate arrangements of genes. In the case of a naturally-occurring ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/241200a0
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  • 5
    Electronic Resource
    Electronic Resource
    Inference of the time of origin of some Drosophila species (1976)
    [s.l.] : Nature Publishing Group
    Nature 259 (1976), S. 395-396 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The ages of each of the twelve volcanoes comprising the five largest Hawaiian Islands (Kauai, Oahu, Molokai, Maui and Hawaii; see inset, upper left, Fig. ]) are accurately known from potassium-jargon and magnetic declination data7. According to a well-supported theory, each volcano has been formed ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/259395a0
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  • 6
    Electronic Resource
    Electronic Resource
    Genetic change after colonization (1992)
    Springer
    GeoJournal 28 (1992), S. 297-302 
    Details
    ISSN: 1572-9893
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
    Notes: Abstract Consideration is given to the case of a daughter population of a sexual species that becomes successfully established in an area previously lacking that species, as has occurred recently in the Krakataus. If the new area is isolated geographically and if the number of founder individuals is small, conventional wisdom foresees a reduction of genetic variability within the colony. This might obstruct genetic adjustment to new conditions. Recent studies of the genetics of such bottlenecked populations, however, show that, in some instances, genetic variability for quantitative traits may actually increase rather than decrease after a bottleneck event. Whereas loss of some quasi-neutral biochemical alleles may occur, the quantitative polygenic balances on which adaptation depends can be carried through the bottleneck into the new population. Novel phenotypes may result from natural selection during the generations that immediately follow the bottleneck. Growing shield volcanoes in particular show rapid turnover of their surfaces such that organisms surviving there must continually recolonize or become extinct. Such species, existing as metapopulations, should be prone to bottleneck effects that produce genetic shifts. Examples are given from Drosophila silvestris on the island of Hawaii. The relevance of such genetic shifts to population structure and evolutionary change in populations is discussed, emphasizing the probable role of metapopulation structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00177245
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  • 7
    Electronic Resource
    Electronic Resource
    The contribution of sexual behavior to Darwinian fitness (1987)
    Springer
    Behavior genetics 17 (1987), S. 597-611 
    Details
    ISSN: 1573-3297
    Keywords: sexual selection ; sexual isolation ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract The idea that sexual selection is responsible for most of the characters, morphological, physiological, and behavioral, that are observed as subserving the efficiency of the reproductive act as an important monitor of fitness is developed. As a corollary, sexual isolation is downgraded, being considered a relatively unimportant secondary process for which the term “mechanism” is singularly inappropriate. The reproductive isolation frequently observed between allopatric species appears to me to be mostly an incidental out come of the fine tuning of the intrapopulational efficiency of the process of sexual reproduction. Two points are stressed: first, sexual selection is a powerful means of serving fitness; and second, hybridization poses little threat to the integrity or future well-being of a species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01065534
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  • 8
    Electronic Resource
    Electronic Resource
    Sexual behavior in laboratory strains ofDrosophila mercatorum that have spontaneously adopted parthenogenesis (1991)
    Springer
    Behavior genetics 21 (1991), S. 305-316 
    Details
    ISSN: 1573-3297
    Keywords: sexual behavior ; sexual selection ; origin of parthenogenesis ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Three instances are described in which bisexual laboratory strains spontaneously adopted an exclusively parthenogenetic mode of reproduction, even in the presence of fertile, bisexual males. The few males produced by the parthenogenetic strains lack a Y chromosome and are sterile but, nevertheless, showed no correlated impairment of normal mating behavior. In contrast, females show a strong reluctance to accept copulation. This behavioral correlate of parthenogenesis also has been observed previously in experimentally produced parthenogenetic lines. We suggest that genetic breakdown in female mating behavior may contribute to an evolutionary stimulus that results in a selective increase in the frequency of diploidizing events in unfertilized eggs. This ultimately might lead to the origin of an exclusively parthenogenetic reproductive mode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01065822
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  • 9
    Electronic Resource
    Electronic Resource
    Human genetic diversity, a critical resource for man's future (1993)
    Springer
    Biology and philosophy 8 (1993), S. 33-45 
    Details
    ISSN: 1572-8404
    Keywords: Human evolution ; genetics of populations ; genetic load ; mutations ; quantitative genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Philosophy
    Notes: Abstract The human gene pool displays exuberant genetic variation; this is normal for a sexual species. Even small isolated populations contain a large percentage of the total variability, emphasizing the basic genetic unity of our species. As modern man spread across the world from its African source, the genetic basis for man's unique mental acuity was retained everywhere. Nevertheless, some geographical genetic variation such as skin color, stature and physiognomy was established. These changes were biologically relatively insignificant. Most of the ‘genetic load’ in the genome has been carried throughout the history of the species. There is little hope of purging all of these harmful genes; we must accept them and continue to treat their syndromes medically. All populations carry extensive genetic variation due to genes that encode variations in quantitative traits. Of greatest importance among these is ubiquitous polygenic variability in brain function and intelligence. Mental acuity is what sets us apart from the rest of the biological world. Throughout our history, genetic recombination among the many genes involved in brain function has occurred. This has provided a genetic basis for the action of natural selection that favors intelligence in meeting the demands of the environment. As environments change in the future, this type of genetic variability will continue to be a crucial resource.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00868504
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  • 10
    Electronic Resource
    Electronic Resource
    Variation in genetic recombination in natural populations (1955)
    Philadelphia : Wiley-Blackwell
    Journal of Cellular and Comparative Physiology 45 (1955), S. 221-236 
    Details
    ISSN: 0095-9898
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1030450512
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