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September 1997
B io Factsheet Number 5
An Idiot's Guide to Populations
April 1997 Number
A population is a group of organisms of one species in a particular location. The location may be defined by natural boundaries (eg. an
island) or defined by the researcher (eg a particular field). We…

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An Idiot's Guide to Populations BioFactsheet

Density dependent factors, however, usually exert a regulatory effect - they Variable Carrying Capacity
act to reduce the rate of increase as the population grows larger. This is The carrying capacity is determined by the availability of resources. This
usually modelled by considering the…

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An Idiot's Guide to Populations BioFactsheet

Population dynamics for two species · The numbers of predators will in general be smaller than those of
The interaction between two or more different species is often the dominant prey,since they are higher in the food chain
influence on the numbers of both.…

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An Idiot's Guide to Populations BioFactsheet

Fig 5 shows the variation in populations of red grouse and its parasite, the Fig 5. Population cycles for red grouse and nematodes
nematode worm. bird over a 13 year period. The graph shows average
number of parasites per bird, not total parasite numbers;…

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An Idiot's Guide to Populations BioFactsheet

Practice Questions 3. The graph illustrates the variation in numbers of hare and
lynx populations over the period 1845 -1935.
1. In an investigation to estimate the population of woodlice in a dead
tree, 100 woodlice were captured and marked, then re-released into…


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