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  • Boundary independence  (1)
  • Buffer zone  (1)
  • Density estimates  (1)
  • Nearest neighbours  (1)
  • Spatial competition  (1)
  • Springer  (3)
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  • Springer  (3)
Erscheinungszeitraum
  • 1
    Digitale Medien
    Digitale Medien
    Aggregation and regularity: an inclusive one-tailed nearest-neighbour analysis of small spatially patchy populations (1996)
    Springer
    Oecologia 106 (1996), S. 206-211 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Buffer zone ; Edge-effect corrections ; Density estimates ; Granite tors ; Buzzard territories
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract When analysing spatial pattern, aggregation and regularity are normally regarded as being mutually exclusive and a two-tailed test is applied to check whether or not there is a deviation from random expectation towards one or the other. However any fine-scale regularity occurring in crowded patches is likely to be masked by the larger-scale aggregation using this approach. An associated problem is that edge effects are particularly severe for small patchy populations. An inclusive analysis utilising one-tailed nearest-neighbour tests to check for aggregation and regularity separately is described. In addition the technique resolves the edge-effect problem. The approach is illustrated using a synthetic patchy population, and is then applied to a population of granite tors showing both large-scale aggregation and fine-scale regularity. Regular spacing of buzzard territories is discussed briefly.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00328600
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Detecting regular spacing in patchy environments and estimating its density using nearest-neighbour graphical analysis (1995)
    Springer
    Oecologia 102 (1995), S. 133-137 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Territoriality ; Spatial competition ; Boundary independence ; Acorn woodpeckers
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Organisms can aggregate to form patches or clusters interspersed with interstices of unoccupied space for behavioural or ecological reasons. Territorial spacing in the clusters could follow, resulting in regularity. In these circumstances an analysis of spatial pattern in a sample area defined by a boundary enclosing the clusters might reveal the aggregation but not the regularity. To demonstrate the occurrence of regularity, spacing trends and an estimate of density based on a nearest-neighbour graphical analysis can be used. The method is independent of boundaries and the presence of interstices. The basis of the method, and its strengths and limitations, are examined. A re-analysis of acorn woodpecker data, which has generated some controversy in the past, illustrates its potential for revealing “hidden” regularity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00333243
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 3
    Digitale Medien
    Digitale Medien
    Nearest-neighbour graphical analysis of spatial pattern and a test for competition in populations of singing crickets (Teleogryllus commodus) (1992)
    Springer
    Oecologia 92 (1992), S. 548-551 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Nearest neighbours ; Graphical analysis ; Spatal competition
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The most crowded individuals in a population often compete for space and develop a regular pattern of spacing. Such regularity is not normally recognized because it occurs within high-density regions of a populated area showing overall aggregation. Thus competition for space, as reflected by spatial pattern, often goes undetected when standard tests for spatial randomness are used. The test described in this paper makes use of truncated samples of nearest-neighbour distances arranged in ascending order, so that only the pattern of spacing of the most crowded individuals is analysed. This is the basis of Pielou's test (1962, 1977) for spatial competition. An advantage of the approach described is that the density of the most crowded individuals is determined graphically. The graphical method also provides a means for choosing an appropriate, non-arbitrary, truncation point for the test. The test was applied to two samples of singing crickets to demonstrate the procedure. The biological significance of the spacing patterns identified is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00317847
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
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