BIO205H5 Midterm: lecture 1 - test 1.docx
Document Summary
Triangle is roulcaree: come to shore and give birth, only go on beaches protected by predators in water (killer whales) and land cliffs (foxes and wolves) Divide the sea lions into 2 groups: eastern, western. Do we compare population with years past/ analyze the past population of sea lions. Graph: number of sea lion way smaller in east than west. West population was part of eastern population. In the west 1960 the fisheries closed: this meant that no fishing on polluck, so polluck population increased, polluck feed on herring and sea lion eat polluck. In east 1970, the polluck fisheries increased, which meant that 2 species praying on herring. Polluck hard to find by sea lions as travel alone, and eat on polluck. Sea lions feed on polluck but they are harder to find and have less nutritional value as herring. The meat of a herring is 10% more fatty and they are easier to capture as travel in schools.
