How are animals affected by run-off?

Answer 1

coz they have nothing to drink

Answer 2

Runoff can kill animals in the water because it brings chemicals into the water that do not belong there. These chemicals can include pesticides actually meant to kill insects, fish, and animals.

Answer 3

The answer depends very much on the nature of the fields nearby: are they planted agricultural fields? fallow and plowed (meaning exposed soil with nothing growing in them)? or are they used for grazing livestock?

Rain runoff from any of the above would vary in terms of how much fertilizer or nitrogen from manure might be dissolved in the runoff, how much sediment, how much residual herbicides or pesticides from treating crops, etc.

Each of these will have an impact on the pond depending on the concentration in the runoff and the size of the pond. Excess nitrogen/manure can cause high demand on dissolved oxygen in the pond water and result in algae blooms which in turn reduce oxygen as the algae dies (problem for fish); too much sediment makes the water cloudy which can harm fish and block the sunlight aquatic plants need; and finally, chemicals like herbicides and pesticides can directly kill aquatic organisms like insects and fish and harm the food chain in the pond.

Ultimately, the goal for a healthy pond ecosystem is to ensure the rain runoff is as clean as possible. One way to do that is to plant a buffer strip around the pond that intercepts polluted runoff and helps it soak into the ground before going directly into the pond. The plants in the buffer strip and the soils can help trap and break down pollutants before they reach the pond.

Answer 4

By clearing hillsides, rain water erodes the bare ground, washing silt into pristine streams and rivers, often damaging the ecosystems there. Many fish species prefer gravel or sand bottoms for reproduction, and will either move out of an area to spawn, or in the case of brook trout, refuse to spawn at all, if silting makes the bottom soft and muddy.

If fish are absent, the species that depend on them will suffer as well.

Then comes the problem of farming chemicals like pesticides and fertilizer washed into the water, making it intolerable for many species.

Answer 5

Water evaporates from the sweat or urine of animals, where it is converted back into rain. They also alter it by breathing because this releases water vapor.

Answer 6

The plants and animals would die

Answer 7

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