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  • 1
    Electronic Resource
    Electronic Resource
    Experimental playbacks show vocal mediation of intergroup avoidance in a forest monkey (1975)
    [s.l.] : Nature Publishing Group
    Nature 255 (1975), S. 56-58 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] I report here the response of gray-cheeked mangabeys, Cercoce-bus albigena, to playback of recorded vocalisations, made in conjunction with an observational study of this species in the Kibale Forest Reserve, western Uganda, between March 1972 and April 1973. The study took place in evergreen rain ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/255056a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Monkeys and matrices: On the coexistence of “omnivorous” forest primates (1981)
    Springer
    Oecologia 49 (1981), S. 102-108 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Members of competing species may influence their share of food sources either by finding new feeding sites more frequently or by more effectively monopolizing those sites once found. We describe a model that separates the effects of these two forms of competition; in a set of African forest primates, only the first has a major effect on species' relative population densities. The model identifies factors which might lead to a greater role of interference at food sources in other communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00376906
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Spontaneous lactation is an adaptive result of pseudopregnancy (1991)
    [s.l.] : Nature Publishing Group
    Nature 351 (1991), S. 660-662 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Dwarf mongooses live in cooperatively breeding packs (mean = 8.9 ±0.4 adults, n = 202 pack-years; 1 pack-year =1 pack monitored for 1 year) in which only a single pair reproduces, though most adults mate in synchrony9"13. Pregnancies are normally precluded in subordinate females by ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/351660a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Is there a “sound window” for primate communication? (1984)
    Springer
    Behavioral ecology and sociobiology 15 (1984), S. 73-76 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary It has long been asserted that habitat acoustics can determine the frequency band bestadapted for long-range communication, but the generality and validity of measurements claiming to demonstrate a “window” of best frequencies have recently been questioned. We report the discovery of a prominent sound window in Kenyan rain forest in a study that is free of methodological difficulties. Our results allow us to calculate the range advantage attained by an animal vocalizing within the sound window, and show that sound windows can be a potent factor for the evolution of primate communication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310219
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Sociality or territorial defense? The influence of resource renewal (1981)
    Springer
    Behavioral ecology and sociobiology 8 (1981), S. 231-237 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The rate with which resources in an area recover from local exploitation should influence the costs to an inhabitant of sharing it with neighbors. I develop a model which predicts the costs of tolerating conspecific foragers (or the benefits of excluding them) as a function of a predator's rate of harvesting prey and the prey's renewal rate. The predictions are consistent with patterns of social grouping observed in small African carnivores. A generalization of the model considers alternate forms of resource renewal (logistic, constant, or “exponential”) and suggests that not only the average rate of renewal but also the details of its time course should influence animal spacing patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00299835
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Cost-benefit approaches to territoriality: A test with forest primates (1979)
    Springer
    Behavioral ecology and sociobiology 6 (1979), S. 115-119 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Defense of an area has often been suggested to be more likely when the area contains critical resources which are available more continously, more reliably, or in greater concentration. We report a case in which field experiments and observations of two closely related primate species do not support these expectations. Among other possibilities, the results may indicate conflicting strategies of spacing between males and females.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00292557
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    “Chance” and mixed-species associations (1984)
    Springer
    Behavioral ecology and sociobiology 15 (1984), S. 197-202 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Spatial associations between members of different animal species may arise through mutual behavioral attraction, through attraction to common resources or locations, or by “chance”. I outline a means of calculating the expected duration of associations based on the null hypothesis that members of different species move independently and randomly. Observed association durations can be compared to these expectations to identify those cases of association (or avoidance) that have biologically interesting causes. The method is applicable to any species in which the presence of a second species can be recorded during focal samples of an individual or a cohesive social group. The data required are readily collected in the field; I illustrate the use of the technique with data from several East African forest primates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00292975
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Sound localization by monkeys: A field experiment (1977)
    Springer
    Behavioral ecology and sociobiology 2 (1977), S. 427-431 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Characteristic responses shown by free ranging mangabeys to playback of species-specific vocalizations allow field measurement of their sound-localizing abilities. The median error of localization of single 10 to 15 s calls heard through several hundred meters of tropical forest was only 6°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00299511
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Fruit Finding by Mangabeys (Lophocebus albigena): Are Monitoring of Fig Trees and Use of Sympatric Frugivore Calls Possible Strategies? (1998)
    Springer
    International journal of primatology 19 (1998), S. 339-353 
    Details
    ISSN: 1573-8604
    Keywords: mangabeys ; range use ; search path ; Kibale National Park ; figs ; frugivore calls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Frugivorous forest primates face a continual challenge to locate ripe fruit due to the poor visibility characterizing a heavily vegetated habitat and the spatial and temporal unpredictability of their fruit sources. We present two hypotheses regarding fruit finding in gray-cheeked mangabeys (Lophocebus albigena). The first hypothesis is that mangabeys monitor nonfruiting fig trees by visiting and checking them for fruit at a higher rate than control trees that do not produce preferred fruit. We test this hypothesis by comparing rates of visitation to focal fig trees and control trees. The second hypothesis is that mangabeys use sympatric frugivore loud calls to locate fruit sources. We test this hypothesis (1) observationally, by comparing the rates at which mangabeys visit calling sites of sympatric frugivores and matched control areas; and (2) experimentally, by following mangabey responses to playbacks of tape-recorded calls: the black-and-white-casqued hornbill (Bycanistes subcylindricus) long call, the great blue turaco (Corythaeola cristata) rattling kok, the adult male mangabey whoopgobble, and the chimpanzee (Pan troglodytes) pant hoot. We tested the hypotheses via data from a single group of mangabeys in the Kibale National Park, Uganda. There is no evidence that mangabeys monitor fig trees for the presence of fruit, but they may use the calls of hornbills to locate fruit. Statistical evidence that mangabeys use conspecific whoopgobbles and chimpanzee pant hoots in fruit finding is lacking, though anecdotal observations suggest this possibility. There is no evidence for use of turaco calls in fruit finding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020391901832
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    Paper (German National Licenses)
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