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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Atlantic economic journal 11 (1983), S. 118-125 
    ISSN: 1573-9678
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Atlantic economic journal 17 (1989), S. 55-62 
    ISSN: 1573-9678
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Atlantic economic journal 12 (1984), S. 50-59 
    ISSN: 1573-9678
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Atlantic economic journal 20 (1992), S. 21-31 
    ISSN: 1573-9678
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Behavioral ecology and sociobiology 33 (1993), S. 131-136 
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary This study investigated whether reduced male aid in defending offspring potentially reduces the fitness of females choosing already-mated males in the house wren (Troglodytes aedon), a small, territorial songbird. Frozen snakes were placed at 23 nests of monogamously mated males and 12 “secondary” nests of bigamously mated males. All presentations were made during incubation stages of females attending focal nests. Snakes were placed at nests of secondary females when nests of their primary counterparts contained young 5–9 days old. Males are most attentive to primary nests during this period and should therefore be relatively inattentive to secondary mates and nests. Nevertheless, an equal proportion of monogamous and bigamous males discovered snakes within 15 min, and mean time to discovery, when discovery occurred, did not differ with nest status. Monogamous and bigamous males were also equally likely to attack snakes physically once discovered. Monogamous males appeared no more likely to discover snakes than bigamous males for two main reasons. First, although monogamous males were near focal nests (i.e., 〈 10 m) more often than bigamous males, monogamous males tended to stay out of view of nests for long periods. In contrast, bigamous males always went immediately to focal nests upon arriving in their vicinity. Second, about one-third of monogamous males in this study spent much of their time during trials at the far edges of their territories advertising for secondary mates. Our experiment suggests that reduced male aid in defending nests against small, diurnal predators probably does not contribute to the cost of polygyny in house wrens.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1618-2650
    Keywords: Untersuchung von Cholinergica ; Belegzellen aus dem Rattenmagen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Plant systematics and evolution 125 (1976), S. 155-167 
    ISSN: 1615-6110
    Keywords: Angiospermae ; Myrtaceae ; Eucalyptus ; Generic delimitation ; species concept ; inflorescence ; phyletics ; polyphylesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Eucalyptus is recognised as containing somewhat more than 450 species, but this number could reasonably be either decreased or increased considerably by slight variations of species concept. Recognition of taxa, at least in the wild, is less difficult than supposed but their ranking depends on degree and nature of discontinuities or steepened gradients of correlated variation, in this group of diploid sexual outbreeding trees of the dominant stratum. Some 8–10 rather distinct lines marked by different character constellations are discernible inEucalyptus s. lat. (incl.Angophora), and it is clear that the floral operculum is of diverse nature and multiple origin. The advisability of recognising several distinct genera depends on the wideness of polyphylesis in relation to other Myrtaceous genera, and (unfortunately) on practical convenience.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Plant systematics and evolution 168 (1989), S. 95-108 
    ISSN: 1615-6110
    Keywords: Cladistics ; phenetics ; phylogeny ; evolutionary taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phenetic classification corresponds to no biological model and lacks a sound philosophical basis. Cladistics (ignoring meaningless “transformed cladistics”) assumes divergent evolution and, usually, that best estimates of phylogeny are obtained by parsimony principles, both questionable assumptions at times. It is better than phenetics since more-or-less testable hypotheses are generated, but pitfalls are many, in data selection and interpretation (as to homology), and in commensurability of units and direction of change. Above all we learn: homoplasy is rife in nature. Much bad cladistics has been done. If it is to reflect phylogeny, classification cannot be artificially stabilized, but is its only aim to express (hypothesized) cladistic patterns? And can it do that with any degree of overall assurance? Biologists are legitimately interested in defining grades as well as clades. Recognition of an unequivocal clade-grade frequently leaves a paraphyletic grade residue that cannot itself be unequivocally resolved. This is a real problem that requires attention in formal taxonomy and in applying cladistics. Primarily morphological cladistics will be increasingly supplanted by molecular (nucleotide-sequence) cladistics. The role of evolutionary taxonomy will change accordingly.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Atlantic economic journal 10 (1982), S. 65-65 
    ISSN: 1573-9678
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1573-966X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract Keynes believed that the "general theory" would create a revolution in economics. The extent to which his prophesy was realized, in part, depends on the definition of "key elements" in the general theory itself. This paper presents one of the key elements that led Keynes to believe the general theory might indeed create such a revolution. This key element is his theory of probability. Keynes' theory of probability evolved over time and resulted in his employing two distinctly different theories of probability in the general theory—one, implicitly, the other, explicitly. The first was an objective degree of belief theory of probability that was implicitly employed in the general theory. The second was a subjective degree of belief theory of probability that Keynes explicitly developed in the general theory.
    Type of Medium: Electronic Resource
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