Make the following paragraph more consistent
The largest pollutant threat to Cottus carolinae habitat is siltation of rivers and streams. Water impurities such as mining-derived metals in areas of Missouri have posed a high enough threat to populations that numbers have dwindled in those areas.
The largest pollutant threat to Cottus carolinae habitat is siltation of rivers and streams. Additionally, water impurities such as mining-derived metals in areas of Missouri have posed a high enough threat to populations that numbers have dwindled in those areas.