Ecology Organisms and Their Environments Ecology n The
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Ecology Organisms and Their Environments
Ecology n. The study of the interactions of organisms and their environment
Biotic Factors All the living organisms that inhabit an environment. n Bio = life tic = pertaining to. n Animals, plants, fungi, bacteria, protists n
Abiotic Factors All the non-living parts of the environment n A = not/without, bio = life n Examples = soil, rocks, water, minerals, temperature n
NOTE: n All organisms depend on others for food, shelter, reproduction and protection. We must study an organism’s relationship with other organisms at different levels and see how different factors affect them.
Levels of Biological Organization
Organism
Population n. A group of organisms of one species that interbreed and live in the same area.
Community n. A collection of populations that interact with one another.
Ecosystem n Interactions of a community and its abiotic factors
Biome large community of plants and animals that occupies a distinct region.
Biosphere n The portion of the Earth that supports life. n Many different environments exist here. n Bio = life
Niche vs. Habitat
Niche n The role a species plays in a community. n Includes the space, food, and other conditions the organism needs to survive.
Habitat n The place where the organism lives.
NOTE: n Several species may share a habitat, but the food, shelter, and resources of that habitat are divided into separate niches.
Interactions between Organisms Aka relationships
Autotrophs n Organisms that use solar energy to make their own food. n Auto = self n Also called Producers
Heterotrophs n Organisms that depend on other organisms for food and energy. n Hetero = other n Also called consumers
5 Types of Heterotrophs
Herbivores n Eat only plants
Carnivores n Eat other heterotrophs
Scavengers n Eat organisms that are already dead
Omnivores n Eat both animals and plants n omni = all
Decomposers n Absorb nutrients from dead organisms n Fungi, Bacteria
Competition Organisms of the same or different species attempt to use an abiotic or biotic resource in the same ecosystem.
Predation n An interaction in which one organism captures and feeds on another organism.
Symbiosis n Close and permanent relationships between organisms
Commensalism n One species benefits and the other is not harmed or benefited.
n Crab sheltering in carpet of a sea anemone
Mutualism n Both species benefit.
n Golden damselfish being cleaned by 2 different cleaner fish- both parties benefit.
Parasitism n One species benefits and the other is harmed.
n Mosquitoes are a parasite. They benefit from our blood and we are harmed by the bite and/or transmitted disease.
n These are common parasites. n Lice, Hookworms, Fleas, Ticks, Leeches
Energy in Ecosystems Note: Organisms interact in order to obtain energy and resources necessary to stay alive.
Energy Flow n Energy flows thru an ecosystem in one direction: sun autotroph heterotroph
Food Chain n. A model that shows how matter and energy move through an ecosystem. It has arrows that show the direction that energy is being transferred.
FOOD CHAIN
Trophic Level n. A feeding step in a food chain that represents each organism.
4 3 2 1
Can you name the trophic levels below? ? Producer Primary consumer Secondary consumer Tertiary consumer
Food Web n Shows all the possible feeding relationships at each trophic level in a community.
Ecological pyramids n Diagram that shows the relative amounts of energy or matter contained within each trophic level in a food chain or food web. n 3 types
Energy Pyramid of Energy Heat 0. 1% Consumers n 1% Consumers 10% Consumers Heat Pa dec rasit lev omp es, s el. ose cav rs eng fee ers da , a t e nd ach 100% Producers n 10% Rule - Only about 10% of energy available within one trophic level is transferred to organisms at the next trophic level The rest is lost as heat
Pyramid of numbers Pyramid of Numbers Fox (1) n Based Birds (25) Grasshoppers (250) Grasses (3000) on the number of individual organisms at each trophic level
Biomass Pyramid n The total amount of living tissue within a given trophic level is called biomass. n A pyramid of biomass represents the amount of potential food available for each trophic level in an ecosystem.
NOTE: n Energy and matter are constantly being recycled. A balance of everything going on in an ecosystem is called HOMEOSTASIS.
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