Populations. A group of individuals that belong to the same species and live in the same area, at the same time. A population is an interbreeding (and.

Slides:



Advertisements
Similar presentations
Chapter 13.
Advertisements

Populations. Rates That Affect Population Size Natality- the birth rate; the number of births over time Mortality- the death rate; the number of deaths.
Population Growth How do communities change over time?
POPULATION DENSITY, DISTRIBUTION & GROWTH.  Density is a measure of how closely packed organisms are in a population  Calculated by … DENSITY # of individuals.
Ecosystems and Organisms What Are The Three Most Important Aspects of Organisms in an Ecosystem? Populations Relationships Evolution Populations Relationships.
Populations How they grow and what affects them. Characteristics of a Population Population Density ◦ How many organisms in a specific area Geographic.
Populations.
 Population - an interbreeding group of individuals of a single species that occupy the same general area.  Community- interacting populations that.
Understanding Population Growth. Population Ecology Deals with #’s of indiv. in a species How and why their numbers are the way they are.
MRS. PITTALUGA – 8 TH GRADE SCIENCE POPULATION ECOLOGY.
Population Dynamics Life Science. Populations Change!  Population Dynamics is the study of why populations change and what causes them to change.
Competition ESE I. Population size A. Population density- # of individuals that live in a given area B. Growth Rate 1. exponential growth curve.
Population Dynamics – Growth Rates Chapter 4. Learning Targets I can… 1. Explain the concept of carrying capacity 2. Model how limiting factors and organism.
How Do Populations Grow? Biology Standard 6 Population Growth.
4 CHARACTERISTICS OF A POPULATION 1.Geographic Distribution/ Range- How much area does the population cover? 2.Density- How many members of the population.
KEY CONCEPT Populations grow in predictable patterns.
ECOLOGISTS STUDY ENVIRONMENTS AT DIFFERENT LEVELS OF ORGANIZATION. Population Ecology Organism  Population  Community  Ecosystem  Biome.
Chapter 5.  Determined by ◦ Births ◦ Deaths ◦ Migration.
Population Dynamics And Evidence for Evolution. Outline how population size is affected by natality, immigration, mortality and emigration Population.
Populations. Researchers study  Geographic range  Density distribution  Growth rate  Age structure.
14.4 Population and Growth Patterns TEKS 11B, 12A, 12D The student is expected to: 11B investigate and analyze how organisms, populations, and communities.
This presentation is available online at
Population Biology Under ideal conditions, populations will continue to grow at an increasing rate. The highest rate for any species is called its biotic.
Populations & Population Growth Populations Population size - number of members in a population 2 ways to estimate population size: 1.Random sampling.
14.4 Population and Growth Patterns KEY CONCEPT Populations grow in predictable patterns.
14.4 Population and Growth Patterns Populations grow in predictable patterns and is always changing.
Population Ecology. Population Dynamics Population: All the individuals of a species that live together in an area Demography: The statistical study of.
 Do you think that a population can just grow forever and forever?
Populations Introduction to Population Dynamics.
KEY CONCEPT Populations grow in predictable patterns.
KEY CONCEPT Populations grow in predictable patterns.
the number of individuals per unit area
Understanding Populations
Ecology # 2 Populations.
Populations.
Chapter 5 Populations.
Population Dynamics (Predator-Prey relationship).
Unit 2: Ecology 2.8 Population Growth.
Populations.
KEY CONCEPT Populations grow in predictable patterns.
Unit 8 Notes: Populations
KEY CONCEPT Populations grow in predictable patterns.
KEY CONCEPT Populations grow in predictable patterns.
Population Dynamics Dynamic=“changing”
Human Population National Geographic : 7 billion
Chapter 5: Populations Sections 1 and 2.
Populations Chapter 2 Guide Part II.
Population Growth Patterns
Population Dynamics Dynamic=“changing”
Populations Objective: A4 - Analyze how populations & communities respond to abiotic & biotic factors and recognize that long-term survival of a species.
How do communities change over time?
Growth Populations Photo Credit: 
Population Ecology.
Ecology POPULATIONS.
Populations Chapter 2 Guide Part II.
EQ: How do we measure populations?
How Populations Grow & Limits to Growth
Populations.
Population Ecology How are populations dispersed in areas?
Populations.
How they grow and what affects them
Feb 16, 2011 Bring up your Invasive Species Analysis questions
Population Dynamics.
Understanding Population Dynamics
Populations & Ecological Succession
Populations Chapter 5 Unit 2.
How Populations Grow.
Chapter 19: Population Ecology
KEY CONCEPT Populations grow in predictable patterns.
KEY CONCEPT Populations grow in predictable patterns.
Presentation transcript:

Populations

A group of individuals that belong to the same species and live in the same area, at the same time. A population is an interbreeding (and evolving) group. Population dynamics include growth, decline, or stability depending on the birth rate, death rate, immigration rate, and emigration rate in the population BIDE rule: (B+I) – (D+E) = change in pop. size

Population Growth Populations tend to grow exponentially (J-curve) given unlimited resources (food, space, etc) Limiting factors (competition for food/nutrients, predation, parasitism etc.) tend to limit growth Limiting factors force populations into logistic growth (S-curve) where population levels off at carrying capacity of the environment

Exponential Growth G = rN Where: G = number of individuals added per unit of time r = rate of increase (B + I) – (D + E ) N = population size If an aphid population of 10 individuals increases by a rate of 0.4 individuals per week. How many aphids will there be by the end of the first week? second? third? (assume living individuals survive)

Logistic Growth G = rN(K-N)/K Where: K = carrying capacity of the environment You are an ecologist attempting to manage the catch of a salmon population so that replacement of caught fish will happen at the fastest rate. The salmon population size is estimated to be about 80,000 fish and the carrying capacity of this environment is estimated to be about 100,000 fish. Given this information, how many fish should you allow to be caught?

Introduced (Invasive) Species May Out- Compete Native Species perch: native smelt: introduced