Chapter 3 Threats to Biodiversity

Chapter 3 Threats to Biodiversity - Chapter 3 Threats to...

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Chapter 3: Threats to Biodiversity Human population and consumption pressures are the root threat to biodiversity Major Threats to Biodiversity and Their Interaction Habitat degradation: includes the spectrum of total conversion from a usable to an unusable habitat type, severe degradation and pollution that makes a habitat more dangerous or difficult for an organism to live in, and fragmentation that can reduce population viability. Caused by hu- man activities such as industry, agriculture, forestry, aquaculture, fishing, mining, sediment and groundwater extraction, infrastructure development, and habitat modification as a result of spe- cies introductions, changes in native species abundance, or changes in fire or other natural dis- turbance regimes. See Figure 3.1, pg 64 for a diagram. Overexploitation: hunting, collecting, fisheries and by-catch, and the impacts of trade in species and species parts. Impacts: more obvious global/local extinction; less obvious decrease in population sizes that could alter an entire ecosystem. Spread of invasive species: direct interactions: predation, parasitism, disease, competition, or hybridization; indirect: disruption of mutualisms, changing abundances or dynamics of native species, or modifying habitat to reduce habitat quality.
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  • Fall '07
  • JeffreyPowellMartaWells
  • native species abundance

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