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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
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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 VS. BIOTIC • The nonliving parts of an organisms environment. • Affect an organisms life • Air currents, temperature, moisture, light and soil • 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