Download e-book for kindle: Animal ecology by S. Charles Kendeigh

By S. Charles Kendeigh

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Additional info for Animal ecology

Example text

In spite of their fundamental imjxjrtance, available methods for measuring population size are only moderately satisfactory and are in need of vast improvement (Balogh 1958, Davis in Mosby 1960). Indices of abundance are sometimes used; for instance the number of individuals or songs observed per hour, per day, or per trip; per cent (frequency) was recorded num- of samples in vk-hich the species ; ber of nests, dens, tracks, or fecal pellets per unit area; amount of food or bait consumed per unit of and so forth.

It and succession succession, a process. communities comjirising a successional sequence leading to the climax is the sere. Seres are sometimes classified according to the predominant force that is bringing them about. These forces are biolic, climatic, physiofnal^hic. and t/eoloc/ic and their resultant seres are A is and geoscres. Produrtivin come is continues until a climax or Biotic succession is brought about by forces inherent within the community and in the activities and animals themselves.

Bioseres may be broadly grouped as priseres and depending on whether they develop on primary or secondary bare areas. A primary bare area is a sterile habitat, such as rock, sand, clay, or water. A secondary bare area is a denudation resulting from temporary flooding, fire, logging, cultivation, overgrazing, or other phenomenon that does not produce an extreme disturbance of the soil or substratum. Since in the latter the habitat has already sup- sttbseres, FIG. stage, Early stages in the pond sere: open water, floating emergent vegetation, swamp shrubs.

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Animal ecology by S. Charles Kendeigh

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