Summarize the main points of the lecture and highlight how the lecture interacts with the text.

The reading passage and the lecturer deals with the decline of sea otthers population. Whilst the author thinks that the pollution caused it for three specific reasons, the lecturer opposses the author's claims. In his opinion, these reasons do not seem to be reasonable. First, the author claims that pollution is the main responsable for otter's population decline due to the sources of contaminants present at the Alaska coast. Samples of water presented high levels of rejects that could damage otters' immune system and cause their deaths. In contrast, the lecturer argues that pollution would be responsable for damaging other species in the coast and this was not seem. The speaker believes that orcs are the culprit. Second, the writer mentions that seals were also showing some decline in their populations and the could happen because of the pollution. He adds that this fact indicates that whatever was affecting the otters was affecting other animals. Again, the speaker specifically addresses this point when he states that the reduction in seals populations could be also related to the orcs. For the lecturer, human hunting has damage the orc's food chain, since their food was not avalaible anymore. Thus, the orcs started to hunt other animals like otters and seals. Finally, the author brings his argument to a close by suggesting that pollution would also explain the strange pattern associated with otters' declive. Not surprisingly, the lecturer takes issue with this claim by contednfing that this could also be explained by predadation. Otters will decrease more in places that orcs can access explaning why in some places the population of otter do not show any reduction. To sum up, both the writer and the speaker hold conflicting views about the main guilt of otter's population decline.