Populations and Sustainability

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  • Created by: livmoss
  • Created on: 04-10-16 15:18
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Logistic growth S-shaped population growth in which exponential increase is limited by
resources, so environmental resistance sets in and carrying capacity is
Limiting factor Any biotic or abiotic factor that restrains the growth of a population.
Environmental The combined effects of the factors that prevent the further increase of a
resistance population.
Carrying The maximum population density that and ecosystem can support.
Niche The role of a species in a habitat, including its trophic level, iteractions with
abiotic environment and interactions with other species e.g. predator/host
Competitive When individuals of different species compete for the same resources, one
exclusion species may succeed and the other species may be excluded from the niche
and completely disappear.
Example: Red/grey squirrel.
Resource Different species competing for the same sort of resources (e.g. food) occupy
partitioning slightly different niches so that they avoid direct competition.
Example: Finding different places to find food.
Character Two species that compete with each other show differences in characters
displacement (features) where they exist in the same ecosystem, but do not show these
differences where they do not exist alongside similar species.
Sustainable A biological resource required as a food r as a raw material that is renewed by
resource the activity of organisms so that there are always sufficient stocks to take
from the environment.
Sustainable Aims to provide for the needs of an increasing human population without
management harming ecosystems, both natural and artificial, and their ability to provide
materials and services for us.


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