NEET BIOLOGY

Detailed explanation-1: -Many fish die due to an increase in water temperature. Due to over-fishing, the number of walleye in Lake Erie decreases. A population is growing quickly when parasites cause disease to spread quickly. Since lake sturgeon migrate long distances to spawn, many do not survive the trip.

Detailed explanation-2: -There are many common density independent factors, such as temperature, natural disasters, and the level of oxygen in the atmosphere. These factors apply to all individuals in a population, regardless of the density.

Detailed explanation-3: -Density-independent mortality is defined as a population-limiting process that is often caused by environmental stochasticity and not influenced by the density of the population. The most dramatic form of density-independent mortality occurs from natural catastrophes such as hurricanes, floods, or wild fires.

Detailed explanation-4: -Density-independent factors affect per capita growth rate independent of population density. Examples include natural disasters like forest fires.

Detailed explanation-5: -While the previously mentioned density-dependant factors are often biotic, density-independent factors are often abiotic. These density-independent factors include food or nutrient limitation, pollutants in the environment, and climate extremes, including seasonal cycles such as monsoons.