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BIO121-ch6

TermDefinition
anthropogenic human-induced ecosystem degradation
ecosystem damage adverse alteration of a natural system’s integrity, diversity, productivity
pollutant substance or form of energy, like hear, that adversely alters the physical, chemical, or biological quality of natural systems or that accumulates in the cells or tissues of living organisms in amounts that threaten their health or survival
acute pollution effects occur immediately upon or shortly after intro of a pollutant, readily detected
chronic pollution effects act in the long term; they are not noticed until several years/decades after the intro of the pollutant
phototoxicity increase in harmful effects of a pollutant that occurs due to the presence of sunlight
synergistic effect their combined effect is greater or more harmful than the sum of their individual effects
bioaccumulation storage of chemicals in an organism in higher concentrations that are normally found in the environment
biomagnification accumulation of chemicals in organisms in increasingly higher concentrations at successive trophic levels
point-source pollution emitted from an identifiable, specific source or point
nonpoint-source pollution cannot be traced to a specific source but rather comes from multiple generalized sources like farmland, parking lots and construction sites
cross-media pollutants affect the ecosystem by moving from one medium (air, water, soil) to another
biodegradable materials that can be broken down and rendered harmless by living systems
nonbiodegradable a substance that enters a system in a forn unusable by the organisms present in that system
persistent pollutant pollutant that accumulates in natural systems over time
ecosystem disruption rapid change in species composition of a community that can be traced directly to a specific human activity
ecosystem destruction conversion of a natural system, such as a wetland, to a less complex human system, such as a farm
desertification land degradation in arid, semi-arid, and dry subsumed regions resulting mainly from adverse human impact
salinization build-up of salts in the soil
deforestation cutting down and clearing away of forests
siltation process by which soil erodes from land surfaces and accumulate in streams and lakes
frontier forests expansive tracts of contiguous forest largely untouched by human activities
fragmentation patchwork of cropland, logging roads and smaller, discrete forest areas—results from chain saws and bulldozers cutting down frontier forests
Created by: tallzy14