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Unit 2: Energy in the Environment
Energy and Ecology
63
Environmental Studies
11th Grade
12/07/2011

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Term
The first law of thermodynamics says...
Definition
Energy cannot be created or destroyed.
Term
If there are 50 births and 30 deaths in a population of 1000 people, what is the % population change?
Definition
2 %
Term
Define: energy
Definition
The capacity to do work by performing mechanical, physical, chemical, or electrical tasks or to cause a heat transfer between two objects at different temperatures.
Term
Energy Quality
Definition
Ability of a form of energy to do useful work.

Low temp heat -> low quality energy
High temp heat -> high energy quality
Term
The 2nd law of thermodynamics says...
Definition
In any conversion of heat energy to useful work, some of the initial energy input is always degraded to a low-quality, more dispersed less useful energy (usually low temp)
Term
Photosynthesis Equation
Definition
6CO2 + 6H2O ==> C6H12O6 + 6O2
Term
Define: Photosynthesis
Definition
Complex process that takes place in cells of green plants.
Radiant energy from sun is used to combine CO2 and water (H2O) to produce oxygen and carbohydrates (such as glucose, (C6H12O6).
Term
Define: Respiration (aerobic)
Definition
Complex process that occurs in the cells of most living organism, in which nutrient organic molecules such as glucose (C6H12O6) combine with oxygen and produce carbon dioxide and water and energy.
Term
Biomass
Definition
Organic matter produced by plants and other photosynthetic producers; total dry weight of all living organisms that can be supported at each trophic level in a food chain or web.
Term
Define: Trophic Level
Definition
All organisms that are the same number of energy transfers away from the original source of energy.
Term
Define: Food Web
Definition
Complex network of many interconnected food chains and feeding relationships.
Term
Define: Food Chain
Definition
Series of organisms in which one eats or decomposes the preceding one.
Term
Define: Ecosystem
Definition
Community of different species interacting with one another and with the chemical and physical factors making up its nonliving environment.
Term
Define: Population
Definition
Group of individual organisms of the SAME species living within a particular area.
Term
Define: Community
Definition
Populations of ALL species living and interacting in an area at a particular time.
Term
Pyramid of Numbers
Definition
A diagram representing the number of organisms of a particular type that can be supported at each trophic level from a given input of solar energy at the producer trophic level in a food chain or food web.
Term
Pyramid of Energy
Definition
A diagram representing the flow of energy through each trophic level in a food chain or food web.

Typically 10% energy transferred to organisms in each energy transfer
Term
Pyramid of Biomass
Definition
A diagram representing the biomass or total dry weight of alll living organisms that can be supported at each trophic level in a food chain/web.
Term
Habitat
Definition
A place or type of place where an organism or population of organisms live
Term
Biotic Factors
Definition
The living organisms that make up the biotic parts of the ecosystem.
Term
Abiotic Factors
Definition
Nonliving component of an ecosystem.
Term
Ecotone
Definition
Transitional zone in which one type of ecosystem tends to merge with another ecosystem.
Term
Ecology
Definition
Study of the interactions of living organisms with one another and with their non-living environment of matter and energy; study of the structure and functions of nature.
Term
Niche (ecological)
Definition
Total way of life or role of a species in an ecosystem. includes all physical and biological conditions a species needs to live and reproduce in an ecoystem.
Term
Fundamental Niche vs. Realized Niche
Definition
A fundamental niche is the full potential range of the physical, chemical, and biological factors a species can use if there is no competition from other species whereas a realized niche is parts of the fundamental niche of a species that are actually used by that species.

Fundamental (potential) it rhymeees
Realized (what is actually used)
Term
Keystone Species
Definition
species that play roles affecting many other organisms in an ecosystem
Term
Indicator species
Definition
a species that serve as early warnings that a community or an ecosystem is being degraded
Term
Specialist species
Definition
species with a narrow ecological niche.
1. only able to live in one type of habitat
2. not very tolerable to climate change
3. use only one or few types of foods
Term
Generalist species
Definition
opposite of specialist (broad ecological niche)
Term
r-selected species
Definition
1. reproduce early
2. lots of offspring, don't raise them
3. small life span
Term
K-selected species
Definition
species that produce a few, often fairly large offspring and raise them to reproduction age
Term
carnivore
Definition
animal that feeds on other animals
Term
omnivore
Definition
animal that can use both plants and other animals as food sources
Term
scavenger
Definition
organism that feeds on dead organisms that were killed by other organisms/died naturally
Term
producer
Definition
organism that uses solar energy (green plant) or chemical energy (bacteria) to manufacture the organic compounds it needs as nutrients from simple inorganic compounds
Term
herbivore
Definition
an organisms that only eats plants
Term
detritivore
Definition
consumer organism that feeds off parts of dead organisms and wastes of living organisms
Term
natural selection
Definition
process by which a particular beneficial gene is passed down through younger generations making it easier for them to adapt to certain environmental conditions
Term
biodiversity
Definition
variety of dif. species
Term
What is the formula for GPP?
Definition
GPP = NPP + Respiration
Term
What is the formula for Respiration?
Definition
Initial dark - dark final
Term
Formula for NPP?
Definition
light final - light initial
Term
Range of Tolerance
Definition
range of chemical and physical conditions that must be maintained for populations of a particular species to stay alive and grow
Term
What is the GPP?
Definition
The gross primary productivity aka the rate at which an ecosystem's producers capture and store a given amount of chemical energy as biomass in a given length of time.
Term
Logistic Growth
Definition
involves exponential population growth when the population is small and a steady decrease in population growth with time as population encounters environmental resistance
Term
How have some species reduced/avoided competition?
Definition
resource partitioning
Term
Resource partitioning
Definition
dividing up of scarce resources so that species with similar needs use them at different time, in different ways or in different places
Term
Predation techniques
Definition
pursuit and ambush, hide and ambush, camouflage, chemical warfare
Term
Mutualism
Definition
When 2 species involved in a symbiotic relationship interact in ways that benefit both of them
Term
Commensalism
Definition
When 2 species involved in a symbiotic relationship interact in ways that benefits one and doesn't affect the other
Term
Parasitism
Definition
When 2 species involved in a symbiotic relationship interact in ways that benefits one and HARMS the other
Term
Amensalism
Definition
When 2 species involved in a symbiotic relationship interact in ways that harms one and doesn't affect the other (ex. an elephant stomps on some plants)
Term
Predation
Definition
members of one species feed directly on another
Term
Competition
Definition
sometimes one species eliminates another species in a particular area through competition for limited resources
Term
If there are 60 births and 20 deaths in a population of 1000 people, what is the % population change?
Definition
4 %
Term
What type of pyramid always looks the same?
Definition
Pyramid of energy (Big on bottom -> smaller)
Term
Net Primary Productivity represents...
Definition
1. plant growth per unit area per unit time
2. energy available per unit area per unit time
3. the energy available to herbivores
4. the amount of biomass remaining after some depletion by a plant's cellular respiration
Term
If a population grows at a MONTHLY rate of 4 %, what is the approximate doubling time in YEARS?
Definition
1.46 years
Term
If the doubling time of a population is 13 years, what is the annual growth rate?
Definition
5.4 %
Term
Which type of species would make a poor indicator species? r or k selected?
Definition
R selected
Term
What is an interacting group of organisms of different species that occupy the same geographic location called?
Definition
Community
Term
The combination of biotic and abiotic factors interacting with one another is called...
Definition
an ecosystem
Term
The total energy stored in this trophic level is highest due to the second law of thermodynamics
Definition
producer
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