Chapter 4 Flashcards

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1
Q

Artificial selection

A

The identification and selection of desirable traits by selectively breeding

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2
Q

Apex predator

A

An animal with no natural predators. Top of the food chain

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3
Q

Biome

A

A major ecological community type

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4
Q

Charismatic megafauna

A

A large species with symbolic value or widespread popular appeal. Often used by activists to gain public support for environmentalist goals

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5
Q

Ecosystem diversity

A

The variety of different habitats, communities, and ecological processes within an ecosystem

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6
Q

Evolution

A

The change in the genetic makeup of a population over time

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7
Q

Foundation species

A

Species that form habitats. Fundamental to the survival of an ecosystem

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8
Q

Functional diversity

A

Variety of processes that occur within ecosystems as species interact (ex: energy flow, matter cycling)

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9
Q

Generalist species

A

Broad niche
Many different habitats
Many different foods
Tolerate a wide range of environmental conditions

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10
Q

Specialist species

A

Narrow niche
One habitat
Few foods
Tolerate a narrow range of environmental conditions
More suceptible to extinction

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11
Q

Genetic diversity

A

Variety of genes found in a population or species

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12
Q

Genetic engineering

A

The process by which scientists alter genes in order to create new traits

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13
Q

Geographic isolation

A

The separation of two populations by a physical barrier, sometimes resulting in speciation

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14
Q

Green world hypothesis

A

Predators regulate the ecosystem from the top down, ensuring that insects don’t eat all the plants

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15
Q

Habitat

A

The home of any living thing

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16
Q

Indicator species

A

A highly sensitive species which can indicate an environmental change early

17
Q

Keystone species

A

A species with a pivotal role in its ecosystem

18
Q

Mass extinction

A

When species vanish at a rate much faster than they can be replaced

19
Q

Mutation

A

A mistake in the DNA sequence of an individual

20
Q

Native species

A

normally live/thrive in a particular ecosystem

21
Q

Natural selection

A

The process by which individuals with favorable traits are better able to survive and reproduce

22
Q

Niche

A

The role an organism plays in a healthy ecosystem

23
Q

Non-native species

A

Migrate into/introduced to a new ecosystem

24
Q

Reproductive isolation

A

The behavioral, geographic, or temporal separation of one group from another

25
Q

Specialist species

A

Narrow niche
One type of habitat
More susceptible to extinction

26
Q

Species

A

A group of organisms capable of producing viable offspring

27
Q

Species diversity

A

Number and abundance of different kinds of species within an ecosystem

28
Q

Species evenness

A

Describes the abundances of species relative to those within their ecosystem
Highest when all species have the same abundance

29
Q

Speciation

A

The process by which a new species evolves from a common ancestor through evolution

30
Q

Trophic cascade

A

The impact on an entire ecosystem when a species is removed or reduced