BIOL 215 Lecture Notes - Lecture 19: Propagule, Central Asia, Environmental Factor

• School: McGill University
• Department: Biology
• Course: BIOL 215
• Professor: Ehab Abouheif

Document Summary

Question: making a big description on how different the community is when cougars are absent and cougars are present. Tropic cascade - controlled by cougars: presence or absence has an impact all the way to frogs, where cougars are common (north creek, where cougars are rare (north fork) It"s not good science - there are so many variables, maybe one habitat isn"t livable for certain reasons, etc. Question 2: shows overwinter mortality of experimentally added seeds to youg sand dune. Explained the pattern observed based on your understanding of succession. Winter mortality: the larger the bar, the more the mortality during the winter: green: early successional species- seeds suffer from low mortality in winter, red: late successional species - suffer high mortality in winter. In the tropics, they have narrow geographic range: high latitude - greater range. Lower latitude - less rang: explanations, climatic variability in the north.