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science 10 chpt 3 set 3
n/a
10
Science
10th Grade
01/15/2011

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Term
Natural selection
Definition
a process that favours the survival of organisms with traits that make them better adapted to the environment; tends to eliminate those individuals that are poorly adapted
Term
Niche
Definition
the overall role of an organism in a community, including the range of biotic and abiotic conditions that the organism can tolerate
Term
Pioneer species
Definition
refers to the first species to arrive and colonize a new environment; over time, the presence of the pioneer species changes the environment, creating acceptable conditions for other species
Term
Polar ice
Definition
the biome characterized by the presence of permanent ice and the absence of significant terrestrial vegetation; occurs at the North and South Poles
Term
Primary productivity
Definition
a measure of the available energy provided by the producers in an ecosystem
Term
Primary succession
Definition
one of two types of ecological succession; the occupation by plant life of an area not previously covered by vegetation
Term
Proliferation
Definition
increase in numbers of individuals with new adaptive traits resulting from natural selection; populations with the new adaptations will proliferate until further selective pressure leads to further adaptations
Term
Resource
Definition
partitioning a process that reduces or eliminates competition for similar resources by individuals of different species; species develop adaptations that allow them to occupy different non-overlapping ecological niches and partition available resources
Term
Savanna
Definition
a tropical grassland biome; of all the biomes, savannas support the greatest number and variety of large herbivores
Term
Secondary succession
Definition
one of two types of succession; the occupation by plant life in an area that was previously covered by vegetation but where there has been a significant disturbance such as fire, flooding, landslides, or forest harvesting
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