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  • Biology  (1)
  • population dynamics  (1)
  • sampling  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    The population dynamics of the mangrove Avicennia marina; demographic synthesis and predictive modelling (1995)
    Springer
    Hydrobiologia 295 (1995), S. 83-88 
    Details
    ISSN: 1573-5117
    Keywords: mangroves ; Avicennia marina ; population dynamics ; demography ; modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Population dynamics of the widespread mangrove Avicennia marina was studied over the complete life-history from zygotes through to adults in southeastern Australia. Zygote survival, propagule dispersal, seedling establishment, seedling recruitment and sapling recruitment were examined by demographic censuses over a range of spatial and temporal scales. Hypotheses about factors regulating survival were tested by manipulative field experiments. Life table statistics for survival and fecundity were used to calculate transition probabilities and their variance for seven stages of life history. These parameters were used as the basis of a stochastic model that predicts population structure after small and large scale perturbations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029114
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    An assessment of some improved techniques for estimating the abundance (frequency) of sedentary organisms (1995)
    Springer
    Plant ecology 120 (1995), S. 131-145 
    Details
    ISSN: 1573-5052
    Keywords: Abundance ; frequency ; frequency-score ; importance-score ; presence-absence ; sampling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The traditional sampling method for estimating frequency (the number of sub-quadrats containing a basal part of the organisms) is compared, using both computer simulations and direct comparison in the field, to two new methods that use a compound series of variable-sized concentric sub-quadrats. Both the new frequency-score and the new importance-score methods are closer approximations of density than is the standard frequency method, and the estimates produced by both of the new methods are less affected by the choice of sub-quadrat size and the spatial distribution (dispersion) of the organisms (i.e. clumping and regularity). Thus, the two nested-quadrat methods appear to ameliorate the usual frequency limitations associated with sub-quadrat size and organism dispersion, by the use of a range of different sub-quadrat sizes. This is important in community studies, where the component species may show a wide range of densities and dispersions. Both of the new methods are easily employed in the field. The importance-score method involves no more sampling effort than does standard qualitative (presence-absence) sampling, and it can therefore be used to sample a larger quadrat area than would normally be used for frequency sampling. This makes the method much more cost-effective as a means of estimating abundance, and it allows a greater number of the rarer species to be included in the sampling. The frequency-score method is more time-consuming, but it is capable of detecting more subtle community patterns. This means that it is particularly useful for the study of species-poor communities or where small variations in composition need to be detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034343
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    Paper (German National Licenses)
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  • 3
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    Transitions in the morphological features, habitat use, and diet of young-of-the-year goosefish (Lophius americanus) (2021)
    In:  http://aquaticcommons.org/id/eprint/8861 | 403 | 2014-01-02 19:26:10 | 8861 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-28
    Description: This study was designed to improve our understanding of transitions in the early life history and the distribution, habitat use, and diets for young-of-the-year (YOY) goosefish(Lophius americanus) and, as a result, their role in northeastern U.S. continental shelf ecosystems. Pelagic juveniles (〉12 to ca. 50 mm total length [TL]) were distributed over most portions of the continental shelf in the Middle Atlantic Bight, Georges Bank, and into the Gulf of Maine. Most individuals settled by 50−85 mm TL and reached approximately 60−120 mm TL by one year of age. Pelagic YOY fed on chaetognaths, hyperiid amphipods, calanoid copepods, and ostracods, and benthic YOY had a varied diet of fishes and benthic crustaceans. Goosefish arewidely scattered on the continental shelf in the Middle Atlantic Bight during their early life history and once settled, are habitat generalists, and thus play a role in many continental shelf habit
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 457-469
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    PAPER (OA)
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