Outline 41 2008 Biology in Winter

Outline 41 2008 Biology in Winter - Lecture 41 Biology in...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 41: Biology in Winter Summary. The tilt of the Earth’s rotational axis causes the Earth’s northern and southern hemispheres to experience seasons. Winter is characterized by colder temperatures, shorter days, and drier conditions, even though precipitation, in the form of snow, may be high. Colder temperatures mean that water in organisms can freeze. Water expands when it freezes, which represents the danger of ice crystals tearing plasma membranes and bursting cells. Organisms have evolved three basic strategies to deal with this: migrate away, remain in the habitat and be dormant, or remain be active. We discussed migration in lecture 40, so in this final lecture, we will discuss physiological, behavioral and morphological adaptations that animals and plants use to make it through the winter. Reading Assignment Campbell, N. A. and Reece, J. B. (2008). Chapter 40 (p. 872). Objectives 1. To understand the depression of the supercooling point of body fluids and how this may help animals avoid freezing.
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern