Biology 2483A Lecture Notes - Lecture 5: Habitat Fragmentation, Mate Choice, Maltose

• School: Western University
• Department: Biology
• Course: Biology 2483A
• Professor: Hugh Henry

Document Summary

Bighorn sheep populations have been reduced by 90% by hunting, habitat loss, and introduction of cattle. Hunting is now restricted; permits for a large (cid:862)trophy ram(cid:863) cost over ,000. Trophy hunting removes the largest and strongest males the ones that would sire many healthy offspring. In one population, 10% of males were removed by hunting each year, the average size of males and their horns decreased over 30 years of study. This is also being observed in other species: Rock shrimp are all born male, and become females when they are large enough to carry eggs. Evolution can be viewed as genetic change over time or as a process of descent with modification. As a population accumulates differences over time and a new species forms, it is different from its ancestors. (happens over generations and at a population level) It begins with adaptions to the environment that gets fixed over time.