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Class 7 - Population Dynamics.docx

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Environmental Studies
Course Code
Sonia Wesche

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Class 7 Population Dynamics Amphibians Dramatic declines in amphibian populations since 1980so Mass localized extinctionso Locations around the world Possible causes not well understoodDiseaseHabitat destruction and modificationExploitationPollutionPesticide useIntroduced alien speciesIncreased UV radiationChanges in PopulationThe number of organisms within an ecosystem from any given species is not stableTends to fluctuate along with environmental conditionsUnder extremely favourable or extremely unfavourable conditions the shifts may be dramatic Biotic PotentialThe capacity for a given species to increase its number given optimum c
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