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Intro to Environmental Science
Vocab words from chapters 1-7 of
97
Environmental Studies
Undergraduate 1
03/10/2010

Additional Environmental Studies Flashcards

 


 

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Term
Biocentric Preservation
Definition
The belief that all organisms have intrinsic value
Term
Environment
Definition
Physical, social and cultural conditions that surround an organism
Term
Sustainable Development
Definition
Meeting the needs of the present without compromising the ability of the future generations to meet their own needs
Term
Utilitarian Conservation
Definition
Uses resources for the greatest good for the greatest number of people for the longest time
Term
Atom
Definition
The smallest particle to exhibit the characteristics of an element
Term
Molecules
Definition
Combination of 2 or more of the same atom (ex. O2)
Term
Compound
Definition
Combination of 2 or more different atoms (ex. H2O)
Term
Conservation of Matter
Definition
In any chemical reaction, matter changes form; it is neither created nor destroyed
Term
Critical Thinking
Definition
An ability to evaluate information and opinions in a systematic, purposeful, efficient manner
Term
Potential Energy
Definition
Energy that is in storage (ex. Water stored behind a dam)
Term
Kinetic Energy
Definition
Energy at work (ex. a car in motion)
Term
First Law of Thermodynamics
Definition
Energy is conserved; it is neither created nor destroyed
Term
Second Law of Thermodynamics
Definition
With each successive energy transfer or transformation in a system, less energy is available to do work (some energy is lost after each transfer)
Term
Photosynthesis
Definition
The biochemical process by which green plants and some bacteria capture light energy and use it to produce chemical bonds. Carbon dioxide and water are consumed and oxygen and simple sugars are produced (6CO2 + 6H2O --> C6H12O6 +6O2)
Term
Cellular Respiration
Definition
The process in which a cell breaks down sugar or other organic compounds to release energy used for cellular work; may be anaerobic or aerobic depending on oxygen availability (6O2 + C6H12O6 --> 6CO2 + 6H20)
Term
Nitrogen Gas Cycle
Definition
The cycle of Nitrogen in the environment (ground to air)
Term
Phosphorous Cycle (solid)
Definition
Starts with Phosphate rocks, Phosphate gets into water supply (via farm runoff, sewage, use of phosphate soaps), Phosphate reaches ocean and stimulates excessive growth, eventually back to rock.
Term
Cells
Definition
Fundamental unit of life; membranes enclose organelles; enzymes facilitate chemical reactions
Term
Producers
Definition
Produce food from inorganic compounds using an external energy source
Term
Biomass
Definition
Total mass of all organisms in a population or area (rainforests and estuaries have highest biomass)
Term
Productivity
Definition
The amount of biomass produced in a given area during a given time
Term
Consumers
Definition
Feed on other organisms or their remains
Term
Herbivore
Definition
Organisms that eat only plants
Term
Carnivore
Definition
Organisms that mainly prey on animals (meat eaters)
Term
Omnivore
Definition
Organisms that eat both plants and animals
Term
Scavenger
Definition
An organism that eats the remains of other animals
Term
Decomposer
Definition
Fungus or bacterium that breaks complex organic material into smaller molecules
Term
Detritivore
Definition
Organisms that consume organic litter, debris and dung
Term
Food Chain
Definition
A linked feeding series
Term
Food Web
Definition
A complex, interlocking series of individual food chains in an ecosystem
Term
Trophic Levels
Definition
Feeding levels in a food chain (producer vs consumer; first level, second level, etc.)
Term
Species
Definition
All the organisms genetically similar enough to breed and produce live, fertile offspring in nature (ex. Asian Elephants)
Term
Population
Definition
All the members of a species that live in the same area at the same time (ex. All Asian Elephants in India)
Term
Biological Community
Definition
The populations of plants, animals and microorganisms living and interacting in a certain area at a given time (ex. The Asian Elephants in India plus everything they eat, and their predators)
Term
Ecosystem
Definition
A specific biological community and its physical environment interacting in an exchange of matter and energy (ex. The Asian Elephants in India eating the plants)
Term
Adaptation
Definition
Physical changes that allow organisms to survive in a given environent
Term
Biotic Potential
Definition
The maximum reproductive rate of an organism, give unlimited resources and ideal environmental conditions
Term
Carrying Capacity
Definition
The maximum number of individuals of any species that can be supported by a particular ecosystem on a long-term basis
[has to have "on a long-term basis" to distinguish between overshoot]
Term
Dieback
Definition
A sudden population decline; also called population crash
Term
Ecological Niche
Definition
The functional role and position of a species in its ecosystem, including what resources it uses, how and when it uses those resources, and how it interacts with other species (ex. Panda Bears eating bamboo)
Term
Environmental Resistance
Definition
All the factors that limit population growth (ex. lack of food, climate, predation, disease)
Term
Evolution
Definition
A theory that explains how random changes in genetic material and competition for scarce resources cause species to change gradually
Term
Exponential Growth
Definition
A growth that is slow at first but that sharply increases (represented by a J-Curve)
Term
Habitat
Definition
The place or set of environmental conditions in which a particular organism lives
Term
Invasive Species
Definition
Organisms that thrive in new territory where they are free of predators, diseases or limitation of resources that may have controlled their population in their native habitat (ex. Zebra Muscles, Asian Beetles)
Term
Keystone Species
Definition
A species whose impact on the community or ecosystem are much larger and more influential than would be expected from mere abundance (ex. Krill, Prairie Dogs)
Term
Natural Selection
Definition
The mechanism of evolutionary change in which environmental pressures cause certain genetic combinations in a population to become more abundant; genetic combinations best adapted for the present environmental conditions tend to be predominant
Term
Overshoot
Definition
A sharp increase in population that usually results in a dieback because it is way over the carrying capacity
Term
Resource Partitioning
Definition
In a biological community, various populations sharing environmental resources through specialization, thereby reducing direct competition (similar to ecological niche (the panda bears))
Term
S-Curve
Definition
A curve that depicts logistic growth; a J-Curve that levels off at the end and then has an "S" shape
Term
Resource Partitioning
Definition
In a biological community, various populations sharing environmental resources through specialization, thereby reducing direct competition (similar to ecological niche (the panda bears))
Term
S-Curve
Definition
A curve that depicts logistic growth; a J-Curve that levels off at the end and then has an "S" shape
Term
Secondary Succession
Definition
A previous community is replaced after a disturbance
Term
Primary Succession
Definition
No previous living species
Term
What are the 4 community properties?
Definition
Abundance: the number of individuals
Diversity: the number of species
Complexity: the number of species at each trophic level
Stability: the ability to resist change or recover from change
Term
Tolerance Limits (Limiting Factors)
Definition
Chemical or physical factors that limit the existence, growth, abundance, or distribution of an organism
Term
Crude Birth Rate
Definition
The number of births in a year per 1000 (the human population growth curve)
Term
Crude Death Rate
Definition
The number of deaths a year per 1000
Term
Demographic Transition
Definition
A pattern of falling death and birth rates in response to improves living conditions (usually leads to rapid growth then stabilized growth)
Term
Total Fertility Rate
Definition
The average number of kids born to a woman
Term
Zero Population Growth
Definition
A condition in which births and immigration in a population just balance deaths and emigration
Term
Biodiversity
Definition
The genetic, species and ecological diversity of the organisms in a given area
Term
Biome
Definition
Ecosystems with similar climate, growth patterns and vegetation
Term
Deforestation
Definition
Removing trees from a forest
Term
Endangered Species
Definition
A species considered to be in imminent danger of extinction
Term
Extinction
Definition
The irrevocable elimination of species; can be a normal process of the natural world as species outcompete or kill off others or as environmental conditions change
Term
Fragmentation
Definition
Disruption of a habitat into small, isolated sections (ex. if a road is built through a forest, it fragments that habitat)
Term
Habitat Conservation Plan
Definition
Part of the U.S. Endangered Species Act of 1973 which also includes recovery plans, private land and critical habitat issues, and minimum viable populations
Term
Minimum Viable Population
Definition
The number of individuals needed for long-term survival of rare and endangered species
Term
Overharvesting
Definition
Harvesting so much of a resource that it threatens its existence
Term
Threatened Species
Definition
While still abundant in parts of its territorial range, this species, has declined significantly in total numbers and may be on the verge of extinction in certain regions or localities
Term
Vulnerable Species
Definition
Naturally rare organisms or species whose numbers have been so reduced by human activities that they are susceptible to actions that could push them into threatened or endangered status
Term
Clear Cutting
Definition
Cutting every tree in a given area, regardless of species or size; an appropriate harvest method for some species; can be destructive if not carefully controlled
Term
Corridors
Definition
Strips of natural habitat that connect two adjacent nature preserves to allow migration of organisms from one place to another
Term
Debt for Nature Swaps
Definition
Forgiveness of international debt in exchange for nature protection in developing countries
Term
Desertification
Definition
Denuding and degrading a once fertile land, initiating a desert-producing cycle that feeds on itself and causes long term changes in the soil, climate and biota of an area
Term
Ecotourism
Definition
A combination of adventure travel, cultural exploration and nature appreciation in wild settings
Term
Monoculture Forestry
Definition
Intensive planting of a single species; an efficent wood production approach, but one that encourages pests and disease infestations and conflicts with wildlife habitat or recreation uses
Term
Old Growth Forest
Definition
Forests free from disturbance for long enough (about 150-200 years) to have mature trees, physical conditions, species diversity and other characteristics of equilibrium ecosystems
Term
Poaching
Definition
Hunting wildlife illegally (ex. Elephants for their tusks)
Term
Rotational Grazing
Definition
Confining grazing animals in a small area for a short time to force them to eat weedy species as well as the more desirable grasses and forbes
Term
Selective Cutting
Definition
Harvesting only mature trees of certain species and size; usually more expensive than clear cutting but less disruptive for wildlife and often better for forest regeneration
Term
Wilderness
Definition
Public land owned by the federal government that has undeveloped land meaning there is no taking of resources form it (oil, logging, grazing)
Term
Wildlife Refuges
Definition
Public land owned by the federal government that has permanent habitat and can be developed (oil, logging, grazing)
Term
Contour Plowing
Definition
Plowing horizontally along the elevation lines on a hill
Term
Cover Crops
Definition
Plants, such as rye, alfalfa or clover, that can be planted immediately after harvest to hold and protect the soil
Term
Famines
Definition
Acute food shortages characterized by large-scale loss of life, social disruption and economic chaos
Term
Food Security
Definition
The ability of individuals to obtain sufficient food on a day-to-day basis
Term
Genetically Modified Organisms (GMOs)
Definition
Organisms created by combining natural or synthetic genes using the techniques of molecular biology
Term
Genetic Engineering
Definition
Laboratory manipulation of genetic material using molecular biology
Term
Green Revolution
Definition
Dramatically increased agricultural production brought about by "miracle" strains of grain (corn, wheat); usually requires high inputs of water, plant nutrients and pesticides
Term
Reduced Tillage Systems
Definition
Farming methods that preserve soil and save energy and water through reduced cultivation; includes minimum till, conserve-till, and no-till systems
Term
Salinization
Definition
A process in which mineral salts accumulate in the soil, killing plants; occurs when soils in dry climates are irrigated profusely
Term
Soil
Definition
A complex mixture of weathered rock material, partially decomposed organic molecules, and a host of living organisms
Term
Sustainable Agriculture
Definition
Ecologically sound, economically viable, socially just agricultural system. Stewardship. soil conservation, and integrated pest management are essential for sustainability
Term
Topsoil
Definition
The first true layer of soil; layer in which organic material is mixed with mineral particles; thickness ranges from a meter or more under virgin prairie to zero in some deserts
Term
Waterlogging
Definition
Water saturation of soil that fills all air spaces and cause plant roots to die from lack of oxygen a result of overirrigation
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