The phylum chordata is divided into different sub phyla. These are known as the urochordata, cephalochordate and vertebrata. They all have different features and they are described below. The urochordata is also known as the tail notochord. They are also known as tunicata, as their body ...

There are certain characteristic features of the phylum chordata. They have a notochord which is like a solid and stiff rod. It is flexible and is present on the mid dorsal side. It lies between the alimentary canal and central nervous system. It is present ...

The ecological dominance is also known as the dominant species. It refers to the most of population in a climax community. The effect on the population is mainly done by the dominant plant species. The community has many species. The Andaman group of islands consists ...

The different stages of succession which are present on the water are known as a hydrosere. It appears as the mud from water disappears. There are many seral stages on the water which are discussed below. The plankton stage is the first stage to appear on ...

The lichen stage is the pioneer stage on rock. The lichens are wind born which settle on the wet surfaces made of rock. This process happens after the rain occurs. They have rhizoids. The crustose lichens are the first one to develop out of all ...

There are different types of biotic succession which can be of primary or secondary type. The primary succession is also known as the prisere. It occurs on the bare areas which include the sand dunes, lava sediments, exposed sea floor and the newly submerged areas. ...

The changes in the biotic community are also known as the biotic succession. It is also known as the ecological succession. It is defined as the development of series which occurs naturally at the same site until a climax community is formed. The climax community ...

The biotic stability is defined as the non appearance of any major fluctuations in the populations so that the stability of community should not be disturbed. The diversity mainly controls the biotic community. The number of species and its interactions also play an important role ...