Ecology and Conservation

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80 Terms

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Community structure

The number of species found in a community, the particular species that are present, and the relative abundance of these species

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Interspecific interaction

include competition, predation, herbivory, parasitism, mutualism, and commensalism

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Competition

A -/- interaction that occurs when individuals of different species each use a resource that limits the survival and reproduction of both individuals

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Competitive exclusion

Local elimination of an inferior competitor

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Ecological niche

The specific set of biotic and abiotic resources that an organism uses in its environment

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Resource partitioning

The differentiation of niches that enables similar species to coexist in a community is called

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Character displacement

Tendency for characteristics to diverge more in sympatric than in allopatric populations of two species is called

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Exploitation

Much of the drama in nature involves this, a term for any type of +/- interaction in which individuals of one species benefit by feeding on individuals of the other species

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Predation

+/- interaction in which an individual of one species kills and eats an individual of the other species

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Aposematic coloration

Warning coloration, such as a poison dart frog

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Cryptic coloration

Camouflage, makes prey difficult to see

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Batesian mimicry

A palatable or harmless species mimics an unpalatable or harmful species to which it is not closely related

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Mullerian mimicry

Two or more unpalatable species, such as the cuckoo bee and yellow jacket, resemble each other

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Herbivory

Exploitative (+/-) interaction in which an organism eats part of a plant or alga, thereby harming it but not killing it

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Parasitism

(+/-) exploitative interaction in which one organism gets its nourishment from another organism that is then harmed in the process

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Endoparasites

Parasites that live within the body of their host

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Ectoparasites

Parasites that feed on the external surface of a host

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Positive interactions

Term that refers to a +/+ interaction between members of two species in which at least one individual benefits and neither is harmed

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Mutualism

+/+ interaction that benefits individuals of both of the interacting species

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Commensalism

Interaction that benefits the individuals of one of the interacting species but neither harms nor helps the individuals of the other species

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Biomass

The total mass of all organisms in a habitat

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Trophic structure

The feeding relationships between organisms

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Food chain

The transfer of chemical energy from its source in plants and other autotrophs through herbivores, to carnivores and eventually to decomposers

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Trophic level

Position an organism occupies in a food chain

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Food web

A group of food chains linked together

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Energetic hypothesis

suggests that the length of a food chain is limited by the inefficiency of energy transfer along the chain

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Foundation species

Have strong effects on their communities as a result of their large size or high abundance

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Keystone species

Not usually abundant in a community

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Ecosystem engineers

Species that create or dramatically alter their environment

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Bottom up control

The abundance of organisms at each trophic level is limited by nutrient supply or the availability of food at lower trophic levels

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Top-down control

The abundance of organisms at each trophic level is controlled by the abundance of consumers at higher trophic levels

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Disturbance

An event that changes a community by removing organisms from it or altering resource availability

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Nonequilibrium model

Describes most communities as constantly changing after disturbance

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Intermediate disturbance hypothesis

Moderate levels of disturbance foster greater species diversity than do high or low levels of disturbance

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Ecological succession

The disturbed area may be colonized by a variety of species, which are gradually replaced by other species, which in turn are replaced by other species

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Primary succession

Process of succession happening in a virtually lifeless area

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Secondary succession

Involves the recolonization of an area after a major disturbance has removed most but not all of the organisms in a community

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Evapotranspiration

The evaporation of water from soil and plants

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Species-area curve

All other factors being equal, the larger the geographic area of a community, the more species it has

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Pathogens

Disease causing microorganisms

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Zoonotic pathogens

Those that are transferred to humans from other animals

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Vector

Intermediate species aiding in the transfer of diseases

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Ecosystem

The sum of all the organisms living in a given area and the abiotic factors with which they interact

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Law of conservation of mass

Matter cannot be created or destroyed

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Primary producers

The trophic level that ultimately supports all others consists of autotrophs

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Primary consumers

Herbivores, which eat plants and other primary producers

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Secondary consumers

Carnivores that eat herbivores

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Tertiary consumers

Carnivores that eat other carnivores

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Decomposers

Group of heterotrophs, consumers that get their energy from detritus

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Detritus

Nonliving organic material, such as the remains of dead organisms, feces, and fallen leaves

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Primary production

The amount of light energy converted to chemical energy by autotrophs during a given tie period.

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Gross primary production (GPP)

Total primary production is an ecosystem is known as that ecosystem’s _____________________, the amount of energy from light converted to the chemical energy of organic molecules per unit of time

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Net primary production (NPP)

Equal to gross primary production minus the energy used by the primary producers because they used by primary producers for their cellular respiration

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Net ecosystem production

Measure of the biomass accumulation by producers and consumers during that time

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Limiting nutrient

The element that must be added for production to increase

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Eutrophication

Primary production can increase dramatically when the nutrient status of an ecosystem changes from nutrient-poor to nutrient-rich

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Secondary production

The amount of chemical energy in consumers’ food that is converted to their own new biomass during a given period

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Production efficiency

The percentage of energy stored in assimilated food that is used for growth and reproduction, not respiration

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Biogeochemical cycles

Nutrient cycles involve both biotic and abiotic components are called this

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Bioremedation

To detoxify polluted ecosystems

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Conservation biology

A discipline that integrates ecology, physiology, molecular biology, genetics, and evolutionary biology to conserve the diversity of life on Earth.

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Genetic diversity

Comprises not only the individual genetic variation within a population, but also genetic differences betweenpopulations.

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Species diversity

The number of species in an ecosystem or across the biosphere

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Endangered species

In danger of extinction throughout all or much of its range

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Threatened species

Considered likely to become endangered in the future

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Ecosystem services

Encompass all the processes through which natural ecosystems help sustain human life. Purify the air and water

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Introduced species

Invasive, non-native or exotic species, those that humans move intentionally or accidentally from the species’ native locations to new geographic regions

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Over harvesting

Harvesting of wild organisms at rates exceeding the ability of their populations to rebound

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Extinction vortex

A small population is vulnerable to inbreeding and genetic drift, can draw the population down this toward smaller and smaller populations size until no individuals survive

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Minimum viable population (MVP)

The minimum population size at which a species is able to sustain its numbers is known as this

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Effective population size

Based on the breeding potential

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Movement corridor

Narrow strip or series of small clumps of habitat connecting otherwise isolated patches, can be important for conserving biodiversity

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Biodiversity hotspot

Relatively small area with numerous endemic species, species found no where else in the world, and a large number of endangered and threatened species

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Zoned reserve

Extensive region that includes areas relatively undisturbed by humans surrounded by areas that have been changed by human activity and are used for economic gain

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Urban ecology

Examines organisms and their environment in urban settings

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Critical load

The amount of added nutrient, usually nitrogen or phosphorous, that can be absorbed by plants without damaging ecosystem integrity

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Biological magnification

Happens because the biomass at any given tropic level is produced from a much larger biomass from a much larger biomass ingested from the level below

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Microplastics

Plastic particles less than 5 mm in size

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Climate change

A directional change to the global climate

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Sustainable development

Economic development that meets the needs of people today without limiting the ability of future generations to meet their needs