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In class bio 100 notes March 29th-31st

by: Megan Hansel

In class bio 100 notes March 29th-31st Biol 100

Marketplace > Kansas > Biology > Biol 100 > In class bio 100 notes March 29th 31st
Megan Hansel
GPA 3.78

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Lecture notes
Principles of Biology
Laurel Haavik, Richard Williamson
Class Notes
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This 4 page Class Notes was uploaded by Megan Hansel on Sunday April 3, 2016. The Class Notes belongs to Biol 100 at Kansas taught by Laurel Haavik, Richard Williamson in Winter 2016. Since its upload, it has received 34 views. For similar materials see Principles of Biology in Biology at Kansas.


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Date Created: 04/03/16
March 29 2016 Chapters: 34, 36-37 (Chapter 36) Ecology: study of organisms and how they take part in the habitat they live in  Food is a large part of ecology o Food has a lot to do with evolution (Natural Selection) What is a population?  A group of organisms in the same species that live in the same habitat o Have the same needs in the same environment  Share the same water, food, shelter, ect. Population changes in size  Things that effect size: o Increasing:  Migration  Birth rates o Decreasing:  Death  Leaving of organisms  Population Density o Used to create an estimate of how many organisms are in an environment o It is the # of individuals of a species per unit area Gold spotted oak borer  Kills trees  They can kill trees if enough of them are within a tree  Population density is used to estimate how many are in a specific tree Clicker Question 1: Does beetle density decrease with increasing tree trunk height? C. yes, but only on some trees ***interpreting graphs is on the test*** Dispersion pattern  Clumped dispersion patterns (most common dispersion in nature) o The organism is clumped in groups throughout the habitat  Usually due to resources  Uniform Dispersion Pattern o Basically the same distance between individuals  Random Dispersion Pattern o Randomly in the environment  Example: dandelion; they are in random places throughout an environment Life Tables:  Helps look at mortality factors in a generation  Survivorship Curves: (3 types) o Type 1:  parental care  only have a few offspring  ex: people o Type 2:  They have a random chance of dying at anytime o Type 3:  No parental care  Have lots of babies  Short life spans Clicker Question 2: C. Type 3 Exponential growth model equation: G=rN  J-shaped curved graph  G= growth rate of population  N= population size  r= per capita rate of increase (# of offspring a female has) o example: if you and your partner have 2 children then they will replace you in the world and r=1 in this case o if you have 4 children with your partner then r=2 Logistic Growth model equation: G= rN ((K-N)/K)  S-shaped curved graph  population growth that is slows when the population increases by limiting factors and stops at the carrying capacity or the max amount of animals in an environment  K= carrying capacity o Density-dependent processes  As the # of individuals increase some process has a higher impact if there are more individuals in an environment  Usually we see declining in births and/or increases in death o Intraspecific competition  Competing for limited resources  Density-dependent factor  Example: Sparrows o Resources: nesting place, food, water o The less female sparrows in the environment the more births Clicker Question 3: C. Abiotic factors:  Are density-independent factors  Usually weather or natural disasters o Drought, fires, seasonal changes Clicker Question 4: D. Clicker Question 5: B. Exponential March 31 2016 Bio 100 Chapter 36 Snow hares Lynx What is causing: 1. Birth rate of prey (b) 2. Death rate of prey (d) 3. Movements of prey (e/i) Clicker Question 1: C. peak reproductive output precedes peak prey density Clicker question 2: A. Survival rate is relatively high when population starts to increase. When density is increasing when the reproduction and survival rates of these hares are at its maximum. Coniferous forests: (where snow hares and lynx live)  Cold, long winters  Short, wet summers  Food in summer: o Plants  Food in winter: o Twigs and shrubs Clicker Question 3: B. Population size change does not depend on food quality. Hypothesis: Predators are an important factor for hare survival.  True: o The cycle of the Snowshoe hare population is affected greatly by predators on the ground o But those predators in the air don’t do much for the snowshoe hares population Clicker Question 4: B predators are an important factor for hare survival Why is the snowshoe hare having less babies while the predator (lynx) population is rising?  If the hares are stressed out due to being preyed on by the lynx  So they cannot reproduce due to this stress


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