13) Below are data from an experiment testing whether experimentally elevated CO

Question

13) Below are data from an experiment testing whether experimentally elevated CO2 increased the rate of herbivory by Pieris caterpillars on cabbage plants. Name two things that are missing from this graph, and therefore make it impossible to draw conclusions from the results (2 points).

14) You are comparing the alpine plant diversity (measured here as species richness) of peaks in the Northern versus Southern Rocky Mountains. The Northern site has 30 plant species and the Southern site has 20 plant species. The two sites only have 5 species that are the same (that is, 5 species occur at both sites). Determine the following (1 point each).

alpha (?) diversity of each site:_North:_______South: _______

gamma (?) diversity: __________________

beta (?) diversity: ________________

Explanation / Answer

Answer:

13) Name two things that are missing from the graph that makes it impossible to draw conclusions from the results:

14) Based on the given information w.r.t Alpine plant diversity of peaks in Northern vs Southern Rock Mountains:

Alpha diversity: Diversity within a particular area or ecosystem and is expressed as number of species.

Gamma diversity: Gamma diversity is a measure representing overall diversity for different ecosystems within a region. Therefore overall diversity = 30 + 20 - 5 = 45 (5 are common species and was counted twice, therefore number 5 is subtracted once). 2 habitats with 45 species total diversity.

Beta diversity: Beta diversity represents degree of change in species richness from one habitat to another and can be determined as the ratio between regional (gamma) diversity and local (alpha) diversity. Amount of species change between the ecosystem.

Therefore, Beta diversity = (30-5) + (20-5) = 25 + 15 = 40

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