The study of distributional patterns of animals at global scale is carried out in different ways e.g.: (i) Collective study of the distributional patterns of all members of particular species. This involves the division of animals in definite distributional areas on the basis of the abundance of animals species; (ii) Animal distribution is also studied […]
World Distribution of Animals | Biosphere | Geography
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2 Main Factors of Animal Dispersal | Biosphere | Geography
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The following points highlight the two main factors which stimulate, affect and control the dispersal of animals. The factors are: 1. Physical Factors 2. Biotic Factors. 1. Physical Factors: Environmental factors include land and water distribution, sediments, physical barriers, physical events, distance etc. Lands and waters are barriers for the dispersal and migration of aquatic […]
Historical Evolution of Plants | Biosphere | Geography
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In this article we will discuss about historical evolution of the plants that can be traced through the geological periods. (1) Evolution of organisms on the earth’s surface begins from the pre-cambrian period when probably the first life in the form of single celled or unicellular microscopic organisms resembling the present-day cocoid or spheroid bacteria, […]