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31 Cards in this Set

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  • Back
Ecology
is the scientific study of interactions among organisms and between organisms and their enviorment, or surroundings
Biosphere
contains the combined portions of the planet in which all of life exists, including land, water, air, or atmosphere
Species
is a group of organisms so similiar to one anotehr that they can breed and produce fertile offspring
Populations
groups of individuals taht belong to the same species and live in the same area
Communities
assemlages of different populations that live together ina defined area
Ecosystem
is a collection of all the organisms that live in a particulare place
Biome
is a group of ecosystems that have the same climate and similar dominant communites
Autotrophs
use evergy from the evniornment to fuel the assembly of simple inorganic compunds inot complez organic molecules
Producers
those that capture evergy from sunlight and those that capture chemical energy are essential to the flow of evergy throu the biosphere
Photosynthesis
these autotrophs use light to power chemical reactions that convert carbon dioxide and water into oxygen
Chemosynthesis
when organisms use chemical energy to produce carbohydrates
Heterotrophs
organisms that rely on other organisms for their energy and food supply, and is also called consumers
Herbivores
obtain energy by eating only plants
Carnivores
eat animals
Omnivores
eat both plants and animals
Detritivores
feed on plant and animal remains and other dead matter
Decomposeres
break down organic matter
Food Chain
a series of steps in which organisms transfer energy by eaten and being eaten
Food Web
links all the food chains in an ecosystem together
Trophic Level
each step in a food chain or food web
Ecological Pyramid
is a diagram that shows the relative amounts of energy or matter contained within each trophic level in a food chain or food web
Biomass
the total amount of living tissue within a given trophic level
Bigeochemical Cycles
when elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the biosphere to anther
Evaporation
the process by which water changes from liquid form to an atmosphere gas
Transpirtation
Water can also enter the atmosphere by evaporating from the leaves of plants
Nutrients
all the chemical substances that an organism needs to sustain life
Nitrogen Fixation
convert nitrogen gas into ammonia
Denitrification
this process releases nitrogen into the atmosphere once again
Primary productivity
is the rate at which organic matter is created by producers
Limiting nutrient
when an ecosystem is limited by a single nutrient that is scarce or cycles very slowly
Algal Bloom
increase in the amount of algae and other producers