Multiple Choice
Removal of a ________________ from a community affects community structure significantly.
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51. Community Ecology
Community Structure
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Which of the following statements correctly describes conditions on a glacier moraine during the reign of pioneer species?
A
Vegetation consists of sphagnum bogs on poorly drained flat areas.
B
Decomposition of acidic spruce needles reduces the pH of the soil.
C
Alder forms dense thickets up to 9 meters tall.
D
Bare soil is acidic because of the carbonate compounds in the parent rocks.
E
Low nitrogen content causes many plants to have yellow leaves.
Verified step by step guidance1
Understand the context: A glacier moraine is a landform made of glacial debris. Pioneer species are the first organisms to colonize this barren environment, initiating ecological succession.
Identify the characteristics of pioneer species: These species are typically hardy, able to withstand harsh conditions, and often improve the environment for subsequent species by altering the soil composition.
Consider the soil conditions: Initially, the soil on a glacier moraine is often nutrient-poor, particularly lacking in nitrogen, which is essential for plant growth.
Recognize the symptoms of nitrogen deficiency: Plants with low nitrogen content often exhibit yellow leaves, a condition known as chlorosis, due to insufficient chlorophyll production.
Connect the information: The statement about low nitrogen content causing yellow leaves aligns with the typical conditions during the reign of pioneer species on a glacier moraine, where soil is initially low in nutrients like nitrogen.
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