The following points highlight the top two barriers to animal distribution. The barriers are: 1. Extrinsic Barriers 2. Intrinsic Barriers. Animal Distribution: Barrier # 1. Extrinsic Barriers: Those barriers working from outside of an individual's body of the population are extrinsic barriers. Extrinsic barriers are generally of three types: (a) Physiographic (b) Biotic and (c) Climatic barriers. (a) Physiographic Barriers: [...]
Zoology Notes on Animal Distribution! Animal Distribution: Type # 1. Distribution in Space: In this type of distribution the arrangement of different types of animal on the earth's surface is considered, i.e., animal's distribution both on land and water. This can further be sub-divided into two types: (i) Geographical or Horizontal Distribution over earth's surface, (ii) Bathymetric or Vertical Distribution. [...]
In this article we will discuss about the Zoogeographical Realms:- 1. Meaning of Zoogeographical Realms 2. Types of Zoogeographical Realms. Meaning of Zoogeographical Realms: On the basis of presence and absence of several organisms, the earth can be divided into some regions. These regions are called realms. Several scientists proposed several scheme of realms. P. L. Sclater (1857) divided the [...]