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POPULATION CHANGES AND ECOSYSTEMS Biology I Mrs. Price BELL WORK Which of the following is a density-dependent limitation on population growth? A) wildfire C) unlimited nutrients B) competition D) severe drought Which of the following is a density-independent factor? A) impact of an object from space C) predation B) introduced species D) availability of sunlight POPULATION CHANGES AND ECOSYSTEMS VIDEO http://education-portal.com/academy/lesson/ecosystems- habitats-and-ecological-niches.html#transcript POPULATION DENSITY Number of individuals of the same species living in a given area What affects population density? Relationships between organisms Movement into and out of the area Resources climate CARRYING CAPACITY The largest population that an environment can support over a long period of time. The carrying capacity is different for different species. When can the carrying capacity change? When conditions in the environment change EXAMPLE: A change in the number of deer may change the carrying capacity for animals that prey on deer. If an area starts getting more precipitation…….. Its carrying capacity for trees may increase. NICHE Each population in a community occupies a unique niche. What is a niche? An organisms role in its environment ( interactions with other organisms and with the nonliving environment) What would be this chickens niche? ABIOTIC The nonliving parts of an organisms environment. Affect an organisms life Air currents, temperature, moisture, light and soil VS. BIOTIC All the living organisms that inhabit an environment All organisms depend on others directly or indirectly for food, shelter, reproduction, and protection VIDEO QUESTIONS Which factor is abiotic? A) # of predators C) soil B) disease D) competition What is a habitat? A) one of the world’s major ecosystem types that is classified according to its predominant vegetation and climate B) An area that is suitable for a particular organism to live in C) The entire area that an organism is found in Which of the following is not an abiotic factor? A) amount of tree cover B) sources of water C) elevation D) climate Cheetahs and lions can coexist together on the plains of the Masai Mara National Reserve because: A) Their different hunting styles allow them different niches B) Lions and cheetahs mark their territory. Lions stay out of cheetah territory What is a niche A) an area that is suitable for a particular organism to live in B) the role that is played by a particular species in the ecosystem TICKET OUT What type of ecosystem did KiKi the lion live in? A) Desert B) Tundra C) Serengeti-Mara D) Tropical Rainforest