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  • 1
    Electronic Resource
    Electronic Resource
    General properties of predictive population models in red grouse (Lagopus lagopus scoticus) (1984)
    Springer
    Oecologia 62 (1984), S. 382-386 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The general properties of an empirical predictive model of population fluctuations in red grouse are discussed. The model incorporates two observed time-lagged relationships between (a) chick production and spring numbers two years earlier, and (b) overwinter survival and numbers in spring one year earlier. The model produced oscillations which were slowly damped with a period of nine years. The addition of randomly-imposed poor breeding sustained the amplitude of oscillations but did not affect the period. Incorporating immigration at low densities reduced the amplitude but preserved the period. Cycle length varied with the model parameters but was generally between 8–10 years. A model with reduced lags of one and zero years could produce shorter cycles of 4–6 years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00384271
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Population size and status of the southern elephant seal (Mirounga leonina) at South Georgia, 1951–1985 (1988)
    Springer
    Polar biology 8 (1988), S. 305-309 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The elephant seal population of South Georgia was surveyed comprehensively during the 1985 breeding season. 87711 females and 10260 adult males were counted. The counts were corrected using a model of the haul-out distribution to adjust for date of count. Annual pup production was estimated to be about 102000. Counts made at various beaches on South Georgia between 1951 and 1964 were examined to compare pup production then with present data. Although the population has fluctuated substantially, the 1985 population estimate was very similar to the estimate based on an incomplete survey in 1951. This contrasts with the Indian Ocean and Macquarie Island populations of this species which recent surveys show to be declining.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263179
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Resampling methods for ecotoxicological data (1996)
    Springer
    Ecotoxicology 5 (1996), S. 197-207 
    Details
    ISSN: 1573-3017
    Keywords: resampling ; randomization tests ; bootstrap estimation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Resampling techniques for statistical analysis have become increasingly popular in recent years. This paper aims to introduce the reader to some simple applications of resampling methods as applied to ecotoxicological data. Examples of applications in trend detection, comparison of two populations and estimation of population parameters are given. These are compared to results obtained from more familiar methods. Finally, the potential of resampling methods is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00116340
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    Paper (German National Licenses)
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