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  • 1
    Electronic Resource
    Electronic Resource
    Single-species models for many-species food webs (2002)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 417 (2002), S. 541-543 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Most species live in species-rich food webs; yet, for a century, most mathematical models for population dynamics have included only one or two species. We ask whether such models are relevant to the real world. Two-species population models of an interacting consumer and resource collapse to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/417541a
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  • 2
    Electronic Resource
    Electronic Resource
    A simple mechanism for population cycles (1976)
    [s.l.] : Nature Publishing Group
    Nature 263 (1976), S. 319-320 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Existing models of cycling populations involve one of three mechanisms: The population is assumed to be a component of a stable but underdamped systemthat is, in the absence of environmental noise the system approaches equilibrium in a series of damped oscillations. Cyclic behaviour is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/263319a0
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  • 3
    Electronic Resource
    Electronic Resource
    The glass bead game (reply) (1981)
    [s.l.] : Nature Publishing Group
    Nature 292 (1981), S. 178-178 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] GURNEY ET AL. REPLY—Readshaw raises three scientific objections to the model described in our recent article1. We shall deal with these in turn. The question of the nature of the mechanism responsible for the observed cycles is very far from 'esoteric'. Any moderately repetitive fine ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/292178b0
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  • 4
    Electronic Resource
    Electronic Resource
    Nicholson's blowflies revisited (1980)
    [s.l.] : Nature Publishing Group
    Nature 287 (1980), S. 17-21 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A simple time-delay model of laboratory insect populations which postulates a ‘humped’ relationship between future adult recruitment and current adult population gives good quantitative agreement with Nicholson's classic blowfly data and explains the appearance of narrow ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/287017a0
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  • 5
    Electronic Resource
    Electronic Resource
    Model of material cycling in a closed ecosystem (1976)
    [s.l.] : Nature Publishing Group
    Nature 264 (1976), S. 633-634 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We consider a linear chain of n trophic levels (see Fig. 1) and denote by xi the number of mol of a given element in the ith trophic level. We follow Ulanowicz and May and model both predatfon and the uptake of inorganic material by quadratic terms of the Lotka?Volterra type. Our key assumption is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/264633a0
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  • 6
    Electronic Resource
    Electronic Resource
    Population dynamic consequences of competition within and between age classes (1994)
    Springer
    Journal of mathematical biology 32 (1994), S. 329-344 
    Details
    ISSN: 1432-1416
    Keywords: Population dynamics ; Competition ; Age structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract We investigate the population dynamics of a semivoltine species whose juvenile development takes two years to complete, and is followed by a very short reproductive adult stage. Reproduction is synchronized so at any given time the juvenile population consists of two cohorts. Coexistence of the two cohorts requires that the strength of intea-cohort competition exceeds that of inter-cohort competition, an extension of the competitive exclusion principle. The population may exhibit population cycles with low integer period. We identify two mechanisms for two-year cycles, and note that four-year cycles are a natural consequence of overcompensation. Three year cycles can occur and we discuss the mechanisms involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00160164
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  • 7
    Electronic Resource
    Electronic Resource
    Generation cycles in stage structured populations (1990)
    Springer
    Bulletin of mathematical biology 52 (1990), S. 375-396 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Some insect populations exhibit cycles in which successive population peaks may correspond to effectively discrete generations. Motivated by this observation, we investigate the structure of matriarchal generations in five simple, continuous-time, stage structure models in order to determine the proportion of individuals in one population peak who are the offspring of individuals in the pervious peak. We conclude that in certain models (including a model of Nicholson's blowflies) successive population peaks do not correspond to discrete generations, whereas in others (including some models of uniform larval competition) successive peaks may well approximate discrete generations. In all models, however, there is eventually significant overlap of generations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458578
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  • 8
    Electronic Resource
    Electronic Resource
    Endogenous metabolism and the stability of microbial prey-predator systems (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 25 (1983), S. 301-306 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: We formulate a variant of the “double Monod model” which takes explicit account of endogenous metabolism. Using parameter values appropriate to carbohydrate-limited substrate, bacterial prey, and protozoan predator, we study the stability of steady states under chemostat conditions. We conclude that the predator's endogenous metabolism may have a stabilizing effect at low dilution rates.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260250122
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  • 9
    Electronic Resource
    Electronic Resource
    Backscattering of light by red cell suspensions (1979)
    Springer
    Medical & biological engineering & computing 17 (1979), S. 763-768 
    Details
    ISSN: 1741-0444
    Keywords: Backscattering ; Red cell suspensions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract It is possible in principle to measure the blood content and oxygenation of the skin and superficial tissues by studying the backscattering of light from such tissues. It is normally assumed that photodiffusion theory may be used to relate reflectance to the optical properties of the tissue, and in order to test this assumption we have madein vitro measurements of the backscattered light from blood over a wide range of haematocrits. The experimental results are consistent with the theory, except over distances comparable with the photon mean free path in the blood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02441559
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  • 10
    Electronic Resource
    Electronic Resource
    What individual life histories can (and cannot) tell about population dynamics (1997)
    Springer
    Aquatic ecology 31 (1997), S. 37-45 
    Details
    ISSN: 1573-5125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We present an overview of a long-term research programme that is aimed at revealing the relations between individual feeding, growth, reproduction and mortality in Daphnia pulex and the state and dynamics of the population. We analyse a physiologically structured population model, in which individual performance is described using an energy budget model that incorporates a food dependence. The model predictions are shown to be at odds with experimental observations on populations of Daphnia. We argue that these discrepancies are primarily due to insufficient knowledge about the precise size-scaling of the food ingestion rate, which plays a central role in the competitive interaction among individuals. To a lesser extent, the discrepancies arise because details about the energy budget of individual Daphnia are not sufficiently known for the food conditions prevailing in population experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009995420368
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