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What chemical weakens bird eggs and lead to decline in bird population?
Wiki User
∙ 15y ago
Dichloro-Diphenyl-Trichloroethane better know at DDT was a pesticide used extensively in America until it was banned 1972. DDT weakens bird shells and causes them to break when the parent tries to incubate them. DDT almost led to the extinction of many species of birds until Rachel Carson's book Silent Spring brought the plight of birds to worldwide attention. Unfortunately DDT is still exported to many third world countries.
Wiki User
∙ 15y ago
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What is the symbiosis balance between the rodents and the carnivorous birds?
The carnivorous birds like the owl, thrush, parrot, hawk, eagle, etc. usually eat the rodents. The rodents are the prey while the carnivorous birds are the predators. Let's try to cut them down here: Prey: Rodents Predator: Carnivorous Birds Here's a simple food chain: Grass>Rodent>Carnivorous Birds There's an interdependence between the rodents and the carnivorous birds. "Interdependence" means when 2 sources tends to depend on each other. There should be enough carnivorous birds to help control the rodent's population, otherwise the rodent might overpopulate or their population might explode. There should also be enough rodents to help feed the carnivorous birds, otherwise they might starve to death. If the animal population changes, it can wreck the food chain and affect other animals. Population Change Without Grass: If the carnivorous bird's population dropped, then the rodent's population will rise as there'll rodents to get eaten. If the rodent's population dropped, then the carnivorous bird's population will also drop as there'll be less food for them to eat. If the carnivorous bird's population rose, then the rodent's population will drop as there'll be more rodents to get eaten. If the rodent's population rose, then the carnivorous bird's population will also rise as there needs to be more carnivorous birds to take more control patrol of the rodent population. Population Change With Grass: If the carnivorous bird's population dropped, then the rodent's population will rise as there'll be more rodents to get eaten. The grass population will also drop as more grasses will get eaten. If the rodent population dropped, then the carnivorous bird's population will also drop as there'll be less food for them to eat. The grass population will rise as less grasses will get eaten. If the carnivorous bird's population rose, then the rodent's population will drop as more rodents will get eaten. The grass population will rise as less grasses will get eaten. If the rodent population rose, then the carnivorous bird's population will also rise as there needs to be more carnivorous birds to take more control patrol of the rodent population. Indirect Interdependence: Animals in the higher link also relies on the lower link. If animal went extinct, then it'll affect the whole upper part as their predator will starve to death, and it affects the other predator. Animals in the higher also have an indirect interdependence with the lower link, although they don't prey on these stuffs. Although the carnivorous birds don't eat the grasses, they still needs to rely on grass because the rodents needs the grasses, which then drives the food chain to them. This is why they need to indirectly depends although that's not their primary food source. Although the carnivorous birds don't eat the grass, they won't last long enough if there weren't any in quite a long explanation. The rodents needs to depend on grass for their primary food source, so without them, the rodents will starve to death. The rodents are the primary food source for the carnivorous birds, so if the rodents are gone, then these carnivorous birds will starve to death. This explains the indirect interdependence that higher animals also needs to rely on the lower links because the lower links helps drive every food source through the food chain, which is them passed to them.
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t rex
