Why are there so many changes to the bay's plant and animal population

Due to fast pace of climate change.

Explanation:

The climatic conditions in a bay area is changing rapidly. Due to this, the flora and fauna of the native area is affected deeply. The mountain pine found on 27 million acres of area has destroyed greatly. The winters have become warm due to which the population of parasites has increased tremendously due to which the large oysters have died. Not only this, there has been a rise in algal blooms and dead zones.  The changing temperature of ocean and river water has affected the navigation of fishes and has also destroyed their habitat.