#2

Scientists determined that excess fertilizer from a pig farm entered a shallow lake. The fertilizer initially caused an
increase in aquatic plants in the lake. However, as the plants died and decomposed, there was a decrease in oxygen
levels in the water. The intensity at which a fish species is affected by oxygen levels in the water varies. Trout are the
first to feel the effects at oxygen levels below 5.0 parts per million. Carp been able to survive levels down to about 1.0
ppm for extended periods.
What will most likely happen to the trout and carp populations in the lake if low oxygen level,
or hypoxia, continue over an extended period? Explain using the concepts of range of
tolerance and abiotic factors.