No plant or animal lives as isolated individual. Plants and animals generally prefer to live in groups or colonies. Different plants and animals living in a habitat constitute a biotic community. When only assemblage of plants in a habitat is considered, it is plant community. Similarly, assemblage of animals in a habitat is called animal community. In any biological organization [...]
Species differ in their environmental requirements. They also differ in respect of their tolerance to environmental fluctuations. The species occur in several morphological forms in different habitat conditions. Gote Turesson (1922), a Swedish worker conducted a series of experiments on variations within a Swedish plant species Plantago maritina. He collected a group of 20 or more individuals of the same [...]
Several eminent workers have prepared detailed schemes for a systematic study of autecological life histories. Stevens and Rock (1952) have suggested scheme for autecological life histories of herbaceous plants, Pelton (1951) has given a scheme for the study of autecological life histories of trees, shrubs and stem succulents; Curtis (1952) for vascular epiphytes, and Cooke (1951) for fungi and they [...]