Unit #2: The Living World (Biodiversity)

biomagnification

• the concentration of toxins in an organism as a result of its ingesting other plants or animals in which the toxins are more widely disbursed.
• area of federally-owned land where logging and grazing are permitted under more heavily-managed conditions
• the condition in which, at ecosystem boundaries, there is greater species diversity and biological density than there is in the heart of ecological communities.
• Occurs when a species is no longer found in an area it once inhabited but is still found elsewhere in the world

the occupation of a habitat or territory by a biological community or of an ecological niche by a single population of a species.

• overgrazing
• colonization
• biomagnification
• speciation

Deliberate alteration of a degraded habitat or ecosystem to restore as much of its ecological structure and function as possible.

• ecological tolerance
• reproductive isolation
• national forest
• ecological restoration

range of tolerance

• the relative proportion of different species in a given area
• the limits to the abiotic conditions that a species can tolerate
• The removal of trees faster than forests can replace themselves.
• the number of different species in a community (synonym for species diversity)

marine protected areas (MPAs)

• discrete regions of ocean that are legally protected from various forms of human exploitation
• Succession following a disturbance that destroys a community without destroying the soil
• Separation of species or populations so that they cannot interbreed and produce fertile offspring
• protected strips of land that allow the migration of organisms from one wilderness area to another

Separation of species or populations so that they cannot interbreed and produce fertile offspring

• background extinction
• primary succession
• genetic diversity
• reproductive isolation

buffer zone

• an area of land that serves as a barrier
• an area that supports a large number of native species
• the formation of new and distinct species in the course of evolution.
• Evaporation of water from the leaves of a plant

A large extinction of many different types of species in a relatively short period of time

• mass extinction
• keystone species
• species richness
• national forest

indicator species

• A species that influences the survival of many other species in an ecosystem
• species that plays a major role in shaping a community by creating and enhancing a habitat that benefits other species
• Species that serve as early warnings that a community or ecosystem is being degraded.
• species that are native to and found only within a limited area

First species to populate an area during primary succession

• endemic species
• pioneer species
• keystone species
• species richness