This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: And 2 aquatic Biomes (marine &amp; freshwater) Measuring Biodiversity There are several definitions of biodiversity A commonly accepted approach is to measure biodiversity by counting the number of species in a given area (species richness) Species richness changes with the area sampled Species-area curve used to-Compare biomes-Predict biodiversity in unexplored areas-Predict extinctions due to loss of habitat-Figure 4-6 Biodiversity Loss Community Degradation-Decline in the number of species in an ecosystem-Lower diversity leads to an easier disruption-Ecosystem health can be defined by indicator species Ecological extinction-A species is too rare to have an impact on its ecosystem Extirpation -A species has died out in a local area Extinction-The complete loss of a species-Background extinction rate- 2 to 10 species per year-Table 11-4...
View Full Document
- Spring '09