Brain Pop Through this sequence, please show how President Obama is linked to Taylor Swift President Obama __________ (sang at Inauguration) ________(Interrupted her award speech) Taylor Swift.
Ecosystems: Everything is Connected
Components in an Ecosystem Abiotic Factors Non-living parts of an environment Example- gold, metal, air, water, light, temperature, etc. Biotic Factors Living parts/organisms in an environment Example- bacteria, trees, humans, mold, etc.
Defining an Ecosystem Ecosystem All organisms living is an area together with their physical environment Example- coral reefs in the ocean
: group of organisms that can mate to produce fertile offspring Species: group of organisms that can mate to produce fertile offspring Are mules a species? Can they have offspring? No- they are not a species, but a male donkey and female horse are two different species Habitat: the place an organisms lives
What is a Population Population is classified as all the members of a species living in the same place at the same time Refers to the group as a whole and the size of it Examples of a population… School of clown fish living in the Anacostia river in the month of December 2015 Mrs. Goldson’s 4th period Environmental Science class at Ballou STAY on Tuesday September 8,2015
Properties of Populations There are three categories 1. Size 2. Density 3. Dispersion Size: Small, Medium, Large Density: number of individuals per unit area (land) or volume (liquid) Dispersion: distribution or arrangement of the individuals (even, clumped, or random)
How Does a Population Grow? Populations can grow based on the number of births or deaths of individuals Change in Population size= Births – Deaths Gains= Births, Loses= Deaths As a result, a population can have 3 outcomes 1. Negative Growth (more deaths than births) 2. Zero Growth (births & deaths are =) 3. Positive Growth (more births than deaths)
Question? How can the growth equal zero? When amount of births = amount of deaths
How Fast Can a Population Grow? Relatively, populations remain somewhat the same size year after year due to 2 factors that help control or maintain reproduction 1. Reproductive Potential 2. Exponential Growth
Reproductive Potential is defined as the maximum number of offspring that each member of a population can produce Increase reproductive potential is when a species can produce multiple number's of offspring at a time Exponential Growth results in fast growth only when there is a plethora (plenty) of resources (food, H20, shelter) have little predators or competitors Why is that?
Question? Bacteria can reproduce within the 1 st few hours of life Cats can in about 3 months Humans are estimated to be able to create offspring around the age of 13 Which of these 3 has the greatest Reproductive Potential and why?
What Limits Population Growth? 2 factors that affect growth 1. Carrying Capacity- the maximum population that an ecosystem can support indefinitely 2. Resource Limits/limiting resource- Particular natural resource that when presented can influence the amount of resources for an environment/ecosystem
Two Types of Population Regulation ((((1) Density dependent- deaths occur more quickly in a crowded densely packed population than sparse iiii.e. diseases (outbreak), predation, competition ((((2) Density independent- certain portion of pop dies regardless of density eeeeffects all members of a pop iiii.e. sever weather, natural disaster
Assignment-Populations Copy both questions 1. Based on the information below, explain that type of growth rate that this population will experience. 2. Scientists do not always agree on the specific carrying capacity of Earth for humans. Why might this carrying capacity be difficult to determine?