3 Biotic vs. Abiotic-Biotic – all LIVING parts of environment. -ex: tree, fly, people -Abiotic – all NONLIVING parts of environment. -ex: water, soil, sunlight, temp.
4 Levels of Environmental Organization OrganismPopulation – all same species that live in areaCommunity – all species that live in areaEcosystem – community plus abiotic factors5. Biosphere – all ecosystems, anywhere life exists
8 Players in the Energy Game -Producers – use sunlight to make food -ex: plants, algae -Consumers – eat other organisms -herbivore – eats only plants -omnivore – eats both plants & animals -carnivore – eats only animals -scavenger – eats dead plants & animals
9 -Decomposers – get energy by breaking down dead organisms -ex: bacteria & fungi -called nature’s recyclers
10 Food Chains-Diagram that shows energy flow from one organism to another -Why are these rare in nature?
11 Food Webs-More realistic than chains -Interconnected chains show feeding relationships in ecosystem -Arrows – is eaten by
15 Limiting Factors-Scarce resource that limits size population can grow -ex: food becomes a limiting factor when population outgrows amount of food available
16 Carrying Capacity-Largest population an environment can support at any given time -When a population grows larger than carrying capacity, limiting factors cause individuals to die or leave
17 Competition-2 or more individuals or populations trying to use the same resource.
18 Predators vs. Prey-Predator – organism that eats the prey -wide variety of methods & abilities for getting foodA cheetah’s speed gives it an advantage over other predators competing for the same prey
19 Prey Adaptations-Prey have methods to keep from being eaten: 1. stay in groups 2. camouflage 3. defense (poison, chemical, physical) 4. burrowing