1. When there is a small amount of pesticide in the environment, it will enter the bodies of the
animals that are low in the food chain - grasshoppers
2. Even though there is only a small amount of the toxin in each grasshopper, the shrews will receive
a larger amount of the toxin in its body because the shrew will eat many grasshoppers.
3. When the secondary consumer is eaten (shrews), the higher-level predator, the owl will get all
of its toxins, plus those of all the other prey it eats.
that the higher the trophic level, the greater the concentration of toxins. This process is referred to as Bioamplification.
top carnivore which has the higher trophic level which is the owl, will be the most badly affected as it will obtain the most
This will lead
to a decline of the population of owls because a lot of owls will be poisoned and dead. If there would be a decline of the
owls, there would be a dramatic increase of the population of shrews as there would not be many predators, and if this happens
there will be a decrease in the population of grasshoppers as they will be more predators (shrews) to eat them.
All of this
comes to a final conclusion about pesticides:
1. Pesticides damage ecosystems
2. Pesticides may damage or harm un-targeted animals
3. Pesticides decrease biodiversity
4. Pesticides may cause a decline in populations or even cause extinction of species
5. Pesticides “mess up” food chains/webs
6. Pesticides disrupt the natural balance in ecosystems