Skip to document
Welcome to StudocuSign in to access the best study resources
Guest user
0followers
HomeMy LibraryAsk AI
  • You don't have any recent items yet.
My Library
  • You don't have any courses yet.
  • You don't have any books yet.
  • You don't have any Studylists yet.

10 - 2 Bio - Lesson notes

Lesson notes
Course

Cellular Biology (BIOL 201)

13 Documents
Students shared 13 documents in this course
Academic year: 2018/2019
Uploaded by:
Anonymous Student
This document has been uploaded by a student, just like you, who decided to remain anonymous.
Gonzaga University

Comments

Please sign in or register to post comments.

Students also viewed

Related documents

Preview text

*V. Populations and Their Environment

*V. Populations and Their Environment A. Simple ecological question B. Factors limiting distribution C. Biotic Interactions

*A. A simple ecological Question What limits the distribution of a species? -Adapted to their specific environments -could be predators Food, competition

*B. Factors Limiting Distribution Species Pool Geographic Abiotic Biotic “more specific” location

    1. Dispersal A species may not occur in an area simply because it cannot get there (a geographic filter) -E. Ocean separate Lion and the North America

We can assess this possibility with a transplant experiment.

  • Transplant a species (e., Gopher Tortoise, commonly in South Georgia) to an area where it does not occur. -Endangered species because of habitat -Why not in North GA? -It just can’t get there

  • If the transplanted organisms fail to survive and reproduce, dispersal is NOT the limiting factor.

  • If the transplanted organisms survive and reproduce, dispersal IS the limiting factor.

  • Unfortunately, there are many examples, mostly accidental:

Example: Fire ant = introduced into Mobile, Alabama, in the 1930s from Brazil. -the only reason why it won’t go north because of the cold (aka environmental problem)

  • They are obviously thriving.

(insert photo about the march of the fire ant)

  • Kudzu = introduced from Japan during the depression (1930’s) to control erosion.

Prior to: Japanese pavilion in the 1876 Centennial Exposition in Philadelphia.

  • Insert photo of rate of spread of Kudzu

  • These are all examples of invasive species, a major environmental problem worldwide. -Another example is Python (which came from Asia)

  • However, dispersal barriers can be overcome naturally (e., Cattle Egret). -insert photo of Cattle Egret-

-most of the time bird migrate north and south. Cattle Egret is the only known bird that migrate all four-cardinal direction. -Cattle Egret is also known as “cow bird”

  • Be sure that you can distinguish three types of dispersal.

  • Jump dispersal = rapid dispersal over inhospitable habitat

  • Diffusion dispersal = slow dispersal across many generations over favorable habitat.

  • Natal dispersal = movement from birthplace to first breeding. -E. Human living away from parent after turning adult is considered a natal dispersal -some organism it can be either male or female Mammal tend to be male Birds tend to be female

*

Behavioral = organisms can make short – term behavioral adjustments in order to maintain a favorable physical environment

  • Physiological = organisms can also make medium – term physiological changes. These reversible changes allow an organism to acclimate to the environment.

  • At high elevations your body adjusts by increasing number of red blood cells and hemoglobin production.

BUT, this is reversible.

  • Genetic = Finally, over the long term, populations can adapt to changing conditions via natural selection. These are changes in populations, not individuals.
Was this document helpful?

10 - 2 Bio - Lesson notes

Course: Cellular Biology (BIOL 201)

13 Documents
Students shared 13 documents in this course

University: Gonzaga University

Was this document helpful?
*V. Populations and Their Environment
*V. Populations and Their Environment
A. Simple ecological question
B. Factors limiting distribution
C. Biotic Interactions
*A. A simple ecological Question
What limits the distribution of a species?
-Adapted to their specific environments
-could be predators
Food, competition
*B. Factors Limiting Distribution
Species Pool
Geographic
Abiotic
Biotic
“more specific” location
*
1. Dispersal
A species may not occur in an area simply because it cannot get there (a geographic filter)
-E.g. Ocean separate Lion and the North America
We can assess this possibility with a transplant experiment.
*
Transplant a species (e.g., Gopher Tortoise, commonly in South Georgia) to an area where it
does not occur.
-Endangered species because of habitat
-Why not in North GA?
-It just can’t get there
*
If the transplanted organisms fail to survive and reproduce, dispersal is NOT the limiting factor.
*
If the transplanted organisms survive and reproduce, dispersal IS the limiting factor.
*
Unfortunately, there are many examples, mostly accidental:

Students also viewed

Related documents