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Download A Cybernetic View of Biological Growth: The Maia Hypothesis by Tony Stebbing PDF

By Tony Stebbing

Maia is the tale of an idea, and its improvement right into a operating speculation, that offers a cybernetic interpretation of the way development is managed. development on the lowest point is managed via regulating the speed of development. entry to the output of regulate mechanisms is supplied via perturbing the starting to be organism, after which filtering out the implications to development price. The output of the expansion keep an eye on mechanism is then available for interpretation and modeling. Perturbation experiments were used to supply interpretations of hormesis, the neutralization of inhibitory load and purchased tolerance to poisonous inhibition, and catch-up progress. The account starts off with an creation to cybernetics overlaying the legislation of progress and inhabitants elevate in animals and guy and describes this new method of entry the keep an eye on of development tactics. This booklet is acceptable for postgraduate scholars of organic cybernetics and researchers of organic development, endocrinology, inhabitants ecology and toxicology.

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Extra resources for A Cybernetic View of Biological Growth: The Maia Hypothesis

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The unlimited population growth of all species tends to reflect a constant relative growth rate, reflecting an underlying constant rate of reproduction in the individual organism. This is the ‘intrinsic rate of natural increase’. New individuals join the population, and in time become reproductive themselves. This positive feedback of the young back into the population acts as multiplier, such that the larger the population becomes the faster it grows. In the long term, exponential growth is unsustainable, even for animals with the slowest rate of reproduction.

The simplest form of growth rate (R) may be expressed as R = N/t but, as we shall see in Chapter 5, such growth is not independent of population size; the rate increases with population size. For reasons that will become clear, it is preferable to separate the two factors that contribute to overall growth rate. dN/dt or dlogeN/dt. This is a per capita growth rate which is independent of population size and is, in principle, constant for each species. In the Law of Exponential Growth (dN/dt = rN), r denotes the relative growth rate.

Unlike the other examples given so far, the population of asexually produced zooids, although capable of independent existence, grows as a plant-like population, such that the history of their growth is spelled out in their fronds. Each year in winter they leave a growth check line on the frond, indicating where growth ceased during the winter months. This allows the size of the colony to be calculated retrospectively at annual ages, and the growth curves of each year class back-plotted over time.

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