60 terms

Ch. 6 AP Environmental Science (Species Interactions and Community Ecology)

The struggle between organisms to survive in a habitat with limited resources
Relating to the bottom of a lake or sea or the organisms that live there.
A defense against predators in which prey species have a shape or coloration that provides camouflage and allows them to avoid detection.
An interaction between species in which one species, the predator, eats the other, the prey.
Batesian mimicry
A type of mimicry in which a harmless species looks like a species that is poisonous or otherwise harmful to predators
Symbiotic relationship in which both organisms benefit, example is pollination
Ecosystem engineers
An organism that causes changes in the physical environment sufficient to influence the structure of landscapes, ecosystems, or communities.
Symbiotic relationship in which one organism(parasite) lives in or on another organism (the host) and consequently harms it
Competitive exclusion
The concept that when populations of two similar species compete for the same limited resources, one population will use the resources more efficiently and have a reproductive advantage that will eventually lead to the elimination of the other population.
Fundamental niche
The full potential range of the physical, chemical, and biological factors a species can use if there is no competition from other species.
Realized niche
The range of resources and conditions a species actually uses or can tolerate at optimal efficiency; smaller than fundamental niche
Resource partitioning
The division of environmental resources by coexisting species such that the niche of each species differs by one or more significant factors from the niches of all coexisting species. Can lead to character displacement
Character displacement
The tendency for characteristics to be more divergent in sympatric populations of two species than in allopatric populations of the same two species.
Structural adaptation that enables one species to resemble another species; may provide protection from predators or other advantages
Mullerian mimicry
Evolution of two species both of which are unpalatable and have poisonous stingers or some other defense mechanism to resemble each other.
An organism that spends a significant portion of its life attached to or within a single host...ultimately kills host
The evolution of two or more species that is due to mutual influence, often in a way that makes the relationship more mutually beneficial
interaction in which one animal (the herbivore) feeds on producers (such as plants)
Living together in mutually helpful association of two dissimilar organisms.
Relationship between two species in which one is inhibited or harmed, while the other is unaffected, an example may be allelopathy
Symbiotic relationship in which one member of the association benefits and the other is neither helped nor harmed. Example is facilitation
The production of chemicals by plants that inhibit the growth of neighbouring plants.
In ecological succession, the phenomenon in which early-arriving species make conditions more favorable for later-arriving species
Trophic level
Step in the movement of energy through an ecosystem; an organism's feeding status in an ecosystem. Each successive level only contains approximately 10% of previous level.
Primary consumer
An herbivore; an organism in the trophic level of an ecosystem that eats plants or algae
Organism that can capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds; also called a producer
Secondary consumer
A member of the trophic level of an ecosystem consisting of carnivores that eat herbivores.
Tertiary consumers
Animals that feed on animal-eating animals. They feed at high trophic levels in food chains and webs. Examples are hawks, lions, bass, and sharks.
Organisms that feed on the detritus and decomposing organic material of living organisms. Recycle nutrients and make soil richer.
Food Web
Network of complex interactions formed by the feeding relationships among the various organisms in an ecosystem (Just look at Pg.151)
The region of the shore of a lake or sea or ocean
Keystone Species
A species that is critical to the functioning of the ecosystem in which it lives because it affects the survival and abundance of many other species in its community
Trophic cascade
A series of changes in the population sizes of organisms at different trophic levels in a food chain, occurring when predators at high trophic levels indirectly promote populations of organisms at low trophic levels by keeping species at intermediate trophic levels in check. Trophic cascades may become apparent when a top predator is eliminated from a system. Also gives evidence for the existence of keystone species.
Term given to a community that resists change and remains stable despite a disturbance.
The rate at which an ecosystem returns to its original state after a disturbance
The gradual and orderly process of change in an ecosystem brought about by the progressive replacement of one community by another until a stable climax is established.
Primary Succession
An ecological succession that begins in an area where no biotic community previously existed or no vegetation or soil life remains.
Secondary Succession
The series of changes that occur in an area where the ecosystem has been disturbed, but where soil and organisms still exist
Pioneer Species
First species to populate an area during primary succession. Usually lichen.
Symbiotic organism between a fungus and a photosynthetic organism
Climax community
A relatively stable long-lasting community reached in a successional series; usually determined by climax and soil type
Fredrick Clements
Botanist who attempted to understand community structure and the first to write about succession.
He claimed communities developed and grew mature like a living organism.
Henry Gleason
Botanist who disagreed with Clements and believed in the individualistic hypothesis. He argued that communities were not cohesive units, but temporary associations of individual species that can reassemble into different combinations.
Invasive Species
Plants and animals that have migrated to areas where they did not originate; often displace native species by outcompeting them for resources
Dutch Elm Disease
A fungus that has seriously diminished or eliminated a very popular shade tree in Europe and North America. Transmitted by 2 species of elm bark beetles. They transfer the fungus to other trees that they borrow into.
National Invasive Species Act
1996 Act that directed the Coast Guard to ensure that ships dump their water ballast at sea and exchange it with salt water before entering the Great Lakes.
Ecological Restoration
The process of altering a site or area with the objective of reestablishing indigenous, historical ecosystems
Restoration ecology
Applying ecological principles in an effort to return ecosystems that have been disturbed by human activity to a condition as similar as possible to their natural state.
A natural community of plants and animals, its composition being largely controlled by climatic conditions. Tend to occur at similar latitudes worldwide.
A visual representation of a region's average monthly temperature and precipitation
Temperate deciduous forest
The biome characterized by warmer temperatures than the boreal forest and plenty of precipitation thats huge forests of broadleaf trees; covers regions in southeastern Canada, and eastern United States
Temperate Grasslands
Biome covering huge areas with low annual rainfall or uneven seasonal rainfall, not good for forests. Grazing animals. Also known as steppes or prairies.
Temperate Rainforest
Rare biome characterized by abundant moisture, mild climate, think and rish soil, and the growth of shrubs and small trees; currently found only in British Columbia, Alaska, and Chile, and parts of pacific north.
Tropical Rainforest
The biome characterized by highest rainfall and high temperatures throughout the year; believed to contain at least half of Earth's biomes, poor acidic soils. Most nutrients in plants.
Tropical Dry Forest
A terrestrial biome characterized by relatively high temperatures and precipitation overall but with a pronounced dry season lasting around 7 months.
Tropical or subtropical grassland, either treeless or with occasional clumps of trees. Most extensive in sub-Saharan Africa but also present in South America.
A barren biome with less than 10 inches of precipitation each year with little rainfall, extreme temperatures, and sparse vegetation.
Treeless arctic or alpine biome characterized by cold, harsh winters, a short growing season, and potential for frost any month of the year; vegetation includes low-growing perennial plants, mosses and lichens
Boreal Forest
A broad band of mixed coniferous and deciduous trees that stretches across northern North America (and also Europe and Asia); its northernmost edfe, the taiga, intergrades with the artic tundra
A scrubland biome of dense, spiny evergreen shrubs found at midlatitudes along coasts where cold ocean currents circulate offshore; characterized by mild, rainy winters and long, hot, dry summers.