# V. Ecology - Population potential I Posted SV.pdf - V...

• No School
• AA 1
• 24

This preview shows page 1 - 7 out of 24 pages.

V. Population Potential Learning Outcomes: 1. Identify factors that affect population size. 2. Explain what factors determine carrying capacity. 3. Compare real population growth curves to models. 4. Given specific examples, predict changes in population size due to different abiotic or biotic factors. Readings: Chapter 19 : 402-414; 417-420

Subscribe to view the full document.

An Overview of Population Ecology A population is a group of individuals of a single species that occupy the same general area at the same time . Individuals in a population rely on the same resources, are influenced by the same environmental factors, and are likely to interact with one another. § Population ecologists study: (1) how individuals in a population are distributed in space and time, and the reasons for those distribution patterns; and (2) the factors that influence a population’s abundance (population size, density), structure, and growth rate.
Terminology: Population size - number of individuals Density - number of individuals per unit area or volume Age structure - proportion of individuals of different ages Population dynamics - the interactions between biotic and abiotic factors that cause variation in population size. Population growth – an important aspect of population dynamics An Overview of Population Ecology

Subscribe to view the full document.

Factors affecting population size (N) Changes in population size (N) can be attributed to four factors: 1. Births 2. Immigration - new individuals from elsewhere join population 3. Deaths 4. Emigration - individuals leave population to go elsewhere Increases population size Decreases population size
Population Growth § These four factors can be incorporated into a mathematical formula for population growth. N t+1 = N t + B – D + I – E § N t+1 = future population size § N t = current population size The population size at some future time period (N t+1 ) equals the current population size (N t ) plus birth and immigrants minus deaths and emigrants.

Subscribe to view the full document.

What are some other influences? Parental age: - The younger the age of the parents when they reproduce: Faster increase - The older the parents when they reproduce: Slower increase Amount of available resources: More resources Healthier individuals -> live longer -> lower death rate: Increase AND/OR Individuals can spend more time growing, delay reproduction (e.g. long-lived trees): Slower increase Few resources Individuals less healthy -> increases death rate….and they have less energy for birthing healthy offspring: Decrease or slower increase AND/OR If resources are limiting….organisms may put available resources into reproduction and then

### What students are saying

• 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.

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

• 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.

Dana University of Pennsylvania ‘17, Course Hero Intern

• 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.

Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes