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  • Elaborate how invasion by an alien species reduces the species diversity of an area.

Elaborate how invasion by an alien species reduces the species diversity of an area.

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When an alien species is introduced into an area accidentally or on purpose, it may become invasive and threaten other species. Invasive species can be a serious competitor, competing for the same resources. It can also turn out to be a predator for some species. There are many examples of invasive species, which played havoc with the local biodiversity. Some examples are  as follows: -

(a) Water Hyacinth: Water Hyacinth is originally from the Amazon basin. It has proved to be an invasive species in many countries. This plant grows at a rapid rate and covers the whole pond and lake. By covering the surface of the pond, this plant reduces the supply of sunlight and oxygen to the bottom of the pond. Thus, it proves detrimental to other organisms in the pond.

(b) Parthenium or Carrot Grass: This plant came as a contaminant along with imported wheat from America. This plant proved to be highly invasive in India. This notorious breed has become a big problem for farmers in India.

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