Consider the following statements regarding ecosystem structure, ecological niches, and community boundaries:
1. An ecological niche encompasses not only the physical microhabitat occupied by a species, but also its functional role and trophic interactions within the community.
2. In open-water aquatic ecosystems, the pyramid of biomass is typically inverted because the standing crop of producers at any given moment is lower than that of primary consumers, supported by a high turnover rate of phytoplankton.
3. An ecotone represents a sharp boundary zone that consistently exhibits lower total species richness and lower population density than either of the adjoining biological communities.
Which of the statements given above are correct?
- 1 and 2 onlyAnswer
- B2 and 3 only
- C1 and 3 only
- D1, 2 and 3
Answer
1 and 2 only
The correct response identifies statements 1 and 2 as true while recognizing statement 3 as false. Ecological niches integrate both spatial habitat requirements and functional community roles. In aquatic ecosystems, rapid reproduction rates of producers create an inverted biomass pyramid despite a upright energy pyramid. Conversely, ecotones exhibit increased species richness and density due to the edge effect, contradicting the claim of reduced diversity.
Step-by-Step Solution
Key Concept
Ecological Niche, Aquatic Pyramids of Biomass, and Edge Effect in Ecotones
Estimated Time:1m 30s