Integrated writing. Summerise the poinst made in the reading and lecture

The reading passage and the lecture are both discussing the spread of zebra mussel in parts of North America and its detrimental consequences. The author describes three problems that have created due to the spread of zebra mussels. However, the professor effectively opposes this argument and refutes each of the point made in the reading. First, the author mentions that mussels transfer from Europe to the east coast of North America by ballast water of ships and will soon colonize all of North America. However, the lecturer believes that there is an effective way to manage this situation. For instance, ships can empty the ballast water and refill in the ocean. Mussels could not endure salty water of the ocean and soon will die. Second, the reading posits that zebra mussels in new habitat become dominant as they can cope with different conditions. Furthermore, they have no predators, hence they can reproduce easily and their population would increase rapidly. By contrast, the professor points out that when the population of mussels increases some of the aquatic birds change their feeding habits and feed on these mussels. Finally, the author mentions the point that as zebra mussels feed on planktons, they become a food competitor for other fishes and have negative effects on the overall population of other freshwater fishes. The professor consedes the negative effect of mussels on the fish population that feeds on planktons but asserts that these mussels have a positive impact on the population of bottom fishes. Mussels produce nutrients for bottom fishes. Whereby, the reading is contradicted by the listening because of the mentioned reasons.