p p biodiversity limiting factors in pop #6
TRANSCRIPT
Biodiversity andLimiting Factors
Chapt 5-2
Factors that cause population growth to decrease
Minnesota has 3 diverse biomes
Biodiversity
� The period since the emergence of humans an ongoing biodiversity reduction and an accompanying loss of genetic diversity. This is due to:– Hunting species to extinction– Introducing toxic chemicals into food
webs– Introducing a foreign species to a new
environment
Invasive Species
� http://www.youtube.com/watch?v=rJDVg35qPNs (4:21 minutes)
Biodiversity Health� Biodiversity boosts ecosystem productivity
where each species, no matter how small, all have an important role to play. For example:– A larger number of plant species means a greater
variety of crops– Greater species diversity ensures natural
sustainability for all life forms– Healthy ecosystems can better withstand and
recover from a variety of disasters.
Sustainability� Sustainability describes how biological
systems remain diverse, robust and productive over time, a necessary precondition for the well-being of humans and other organisms.
� Long-lived and healthy wetlands and forests are examples of sustainable biological systems.
Density Dependent Factors
� A limiting factor that depends on population size
� Limiting factors
Food supply
� Disease– Ex. Dutch Elm disease
� Stress– Predator-prey– Competition– Overcrowding
DENSITY INDEPENDENT
� Limiting factor that affects all populations in similar ways, regardless of population size
Examples: Natural disasters
Hurricane Katrina
Katrina Continued
More of Katrina
One more of Katrina
Density Independent
� Human Activities - damming, cutting forests, building roads
Things to study for the test
� Relationships within an environment– Biotic vs abiotic– symbiosis– Preditor-prey– Mutualism
– Commensalisms– Niches– Habitat– competition
� Levels of organization
- biosphere– Biomes– Ecosystem
– Community– Population– Organism/species
Test stuff
Cycles in Nature:– Atmosphere to soil (N2 - NO3) denitrification,
nitrification– Carbon Cycle Photosynthesis/ respiration (O2 - CO2)
– H2O Cycle– Phosphorus Cycle
More
� Populations graphs– Exponential– Logistic– Predator prey– Extinction
– 3 different possible phases on graphs
– Carrying capacity
� Limiting factors on populations– Density dependent– Density independent– Limiting factors
Biodiversity
Sustainability
resources
Big Arrow
� Trophic levels� Autotrophs� heterotrophs� Detrivore� Decomposer� Productivity� Food chain� Food web
� Immigration� Emigration� Omnivore� Carnivore� Herbivore� Natality� mortality
Partner Quiz
� 1. Autotrophs use light energy to power chemical reactions that convert CO2 and H2O into ____– A. water and carbohydrates
– B. oxygen and carbohydrates– C. energy and proteins– D. energy and fats