Biology – Biodiversity | e-Consult
Biodiversity (1 questions)
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Calculations:
Total number of individuals = 50 + 30 + 20 + 10 + 5 = 115
- pi (Oak) = 50/115 ≈ 0.435
- pi (Beech) = 30/115 ≈ 0.261
- pi (Ash) = 20/115 ≈ 0.174
- pi (Maple) = 10/115 ≈ 0.087
- pi (Willow) = 5/115 ≈ 0.043
- Σ pi ≈ 0.435 + 0.261 + 0.174 + 0.087 + 0.043 = 1.000
- D = 1 - (1)^2 = 0
Answer:
The Simpson's index of diversity (D) for this forest plot is 0. This indicates that the plant diversity in this forest plot is very low. A D value of 0 suggests that one or a few species dominate the forest, with a few species being very common and others being rare.
Implications for Ecosystem Stability:
Low plant diversity can have several implications for the ecosystem's stability:
- Vulnerability to Disease/Pests: If a disease or pest targets the dominant species (Oak in this case), the entire ecosystem could be severely affected.
- Reduced Resilience to Environmental Change: A less diverse plant community may be less able to adapt to changes in climate or other environmental factors.
- Less Complex Food Webs: A lack of plant diversity can lead to simpler food webs, which are often less stable.
- Nutrient Cycling Issues: Different plant species have different nutrient requirements and contribute to nutrient cycling in different ways. Low diversity can disrupt these processes.