Species-Time Hypothesis 

Communities diversify, that is, gain species, with time

Temperate regions are less species-rich than tropical regions because they are younger and have only more recently recovered from glaciations and severe climatic disruption

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#Unit 10. Ecological Principles

1. Number of species of animal( In India) 

Arthopoda ( 68389)  > Mollusca (5070) > Protozoa (2577) > Pisces (2546) > Aves (1232) > Reptile (456) > mammal(390) > Amphibian ( 209)  

2. Number of species of vertebrate animal (Global) 

Fish (30000) > Birds (9956) > Reptiles (8240) > Amphibian (6199) > Mammal (5416)

Species diversity in plant Angiosperm >Fungi > Algae > Bryophytes > Fern  > Gymnosperm 

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#Unit 10. Ecological Principles

Ecological diversity: At the ecosystem level, India, for instance, with its deserts, rain forests, mangroves, coral reefs, wetlands, estuaries, and alpine meadows has greater ecosystem diversity than a Scandinavian country like Norway.

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#Unit 10. Ecological Principles

Biomes:  A biome is a collection of ecosystems sharing similar climatic conditions. A biome has distinctive abiotic factors and species which distinguish it from other biomes.

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#Unit 10. Ecological Principles

Precipitation and temperature, two primary non biological factors have major impacts on the biome Periodic fires are important in maintaining some grassland and shrub climax communities 

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#Unit 10. Ecological Principles

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#Id: 6046

#Unit 10. Ecological Principles