Decline in the population of indian native fishes due to introduction of clarias gariepinus in river yamuna can be categorised as

Rapid decline in the population , due to high mortality rate is called

Read the following information and five statements given below it carefully and answer the question which follow : Excerpt from a research report - 'Average life expectancy in southern part of India is far more than that in Western India. While the average life of a native of South India is 82 years, the average life of a native of Western India is only 74 years.' Based on the above fact, the proposal that the above study makes is that if an individual moves from Western India to South India, his/her life life expectancy would immediately increase by eight years. Which of the following statement would weaken the above-mentioned studies proposal that people belonging to Western parts of India should move to South India to increase their life expectancy ? 1) The average life expectancy of population living in Eastern part of the country is also less than the population living in South India. 2) Nearly 80% of the population in Southern India has a minimum age of 83 years 3) Higher life expectancy in Southern India can be ascribed to the genetic makeup of the population belonging to that area. 4) The average life expectancy of South India is comparable to the best averages in the world. 5) Higher life expectancy in the Southern India can be attributed to better environmental conditions and better healthcare facilities.

Population of California Candor/Gymnogyps californianus is declining due to

Extinction of more than 200 species of cichlid fish in lake Victoria was due to introduction of