Which of the following niche models suggests the most competition between two species? Number of seeds consumed Seed size (mm) Number of seeds consumed Seed size (mm) Number of seeds consumed Seed size (mm) Number of seeds consumed
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Step 1: The niche model that suggests the most competition between two species is the one where the two species have the most overlap in their resource use. Show more…
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Which of the following niche models suggests the most competition between two species? Number of seeds consumed Seed size (mm) Number of seeds consumed Seed size (mm) Number of seeds consumed Seed size (mm) Number of seeds consumed Seed size (mm)
Sana R.
Imagine that Galapagos finch species A through D shown below are competing for seed resources on a single island. Figure 1. Galapagos Finches and Seeds 2. The size and number of seeds that each finch species consumes is indicated in the diagram above. Use this information to fill in boxes I to IV in the graph below, each with the letters of two species that would lead to the outcome indicated in the graph. Leave box V blank for now. Explain your reasoning in ~2 sentences. [2pts] Competitive exclusion Priority effect Coexistence Figure 2. Coexistence Graph
Katlin K.
1. Brown and Davidson (1977) examined the possible competition for seeds between rodents and ants in a desert in Arizona by means of a field experiment. In unmanipulated areas (i.e. controls), there was an average of 318 ant colonies and 122 rodents per plot. In two plots, where the rodents were trapped out and then excluded by mesh fences, the average number of ant colonies increased by 71% to 543, and in two other plots, where the ants were killed with insecticide, the mean number of rodents increased by 18% to 144. In two other plots where both ants and rodents were excluded, the seed biomass increased by 24% to 5.12 kg from 4.13 kg on the control plots. A. Do these results confirm that ants and rodents are competing for seeds? Are there alternative explanations for these results? B. Assuming that there is interspecific competition, calculate the approximate interspecific competition coefficients for the two species.
Supreeta N.
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