Breed population analyses: some background, a guide to the reports, & some interesting examples.
Population A group of organisms that belongs to the same species Population members breed with each...
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Population A group of organisms that belongs to the same species Population members breed with each other and live in the same area
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Transcript of Population A group of organisms that belongs to the same species Population members breed with each...
Population A group of organisms that belongs to the
same species Population members breed with each other
and live in the same area
Population dynamics The study of the change in population
numbers and the factors influencing those changes
Population
sizeBirth
Immigration
Death
Emmigration
Time, in generations
Pop
ulat
ion
size
Exponential growth –
Can this happen in nature? Yes Invasive species
Time, in generations
Pop
ulat
ion
size
Logistic equation –
K
K = Carrying capacity The maximum number of individuals that a
habitat can support for a prolonged period of time
Not constant, it fluctuates.
Limiting Factors-factors that affect the carrying capacity
Density-independent factors
Density-dependent factors
Population structure A population that is 75% adults, 25% juveniles
is very different from a population of 25% adults and 75% juveniles.
Population structure Age structure –
distribution of ages in a population.
Size structure – distribution of sizes in a population.
Biodiversity:
Who cares?
Which is more diverse?
A B
Which is more diverse?
A B
Which is more diverse?
A B
A B
Which is more diverse?
A B
Which has more cultural diversity?
Which has more biodiversity?
A B
Which has more biodiversity?
A B
What do you think biodiversity means?
Bio =
Biodiversity
What does “Bio” mean?
Biodiversity
Diversity = Variety
What does “Diversity” mean?
Biodiversity is the variety of life in an area or on Earth
Threats to BiodiversityThings that mess up our delicate balance with Earth 1. Habitat Loss
2. Pollution
3. Exploitation
4. Global Climate Change
5. Invasive Species
Habitat Loss
Habitat destruction Logging Ranching Agriculture Houses Roads
Exploitation
Over hunting Over Fishing Over Using
Pollution
Pollution occurs in the air, on the land, and in the water.
Biological Magnification
Toxic substances become more concentrated at higher levels in the food chain.
Ozone Depletion
Pollution from chlorofluorocarbons (CFC’s) released into the atmosphere destroys the ozone layer.
Invasive Species
Non-native species that is brought into an area that takes over killing many things that live there.
Global Climate Change
Global Warming: warming of planet due to atmospheric accumulation of carbon dioxide.
KEY BAD WORDS
Threatened Species - any species which is likely to become an endangered species within the foreseeable future throughout all or a significant portion of its range
Endangered Species - any species which is in danger of extinction throughout all or a significant portion of its range
Extinction - no longer in existence
Should we be concerned about biodiversity?
What we know: The Earth is losing species at an alarming rate
Three species per hour are going extinct. When species of plants and animals go
extinct, many other species are affected.
What do we get from biodiversity?
FoodOxygen Clean WaterMedicineSurvival!
Conservation Biology
Preservations Rescue programs Resource
conservation Reintroduction
programs
A branch of biology that focuses on the preservation of biodiversity
Protecting Biodiversity
16 June 2010 Biodiversity.ppt 35
Biodiversity “hotspots” Protection of habitat
