the climate
the climate
There are many contributing factors that could be the cause for a decrease in fox population. Over population, not enough food, disease, or over hunting or poaching any of these could be the reason for a decrease in the population.
Death and migration are factors that can decrease hare population.
The hare's population would decrease if the number of predators that eat the hare increased. Take the Lynx for example. In 1865, The population of hares in the forest was almost over 150. But 1 week later, the population dropped by 50 due to more lynxes in the forest. Another reason might be because of migration. Migration might have happened because the hares were simply frightened. Hoped this helped :D
an increase in the spider population
To thrive is to flourish. For example, an organism will thrive in a particular environment if the living conditions are good - this could be caused by abiotic or biotic factors such as a decrease in predator numbers thus increasing the organism's population, or favorable weather that promote growth etc.
This could be anything, from earthquakes to migration to floods to disease, and so on, and so forth. In nature, population sizes naturally fluctuate even without such events, due to changes in the availability of resources, predation, and so on.
If the carrying capacity suddenly decreased, you could probably expect the amount of organisms within the ecosystem to decrease as well. (There is a decreased amount of room/resources for the organisms, causing the quantity of organisms to decrease as well.) hope that helps :)
A sudden decrease in the butterfly population would cause a corresponding decrease in the chameleon population since they no longer have enough food.
Probably an increase in the population in their main predator or over hunting by humans
More predators so the population would decrease :(
A population can decrease in size through emigration, which is the movement of individuals out of a population to another area. Another way is through mortality, which is the death rate within a population exceeding the birth rate, leading to a net decrease in population size. These two factors, emigration and mortality, can result in a decline in population numbers over time.