Q.3
Van Valen's (1976) Ecological species concept explains that a species taxon as a lineage of organisms is maintained and
segmented by ecological forces. Accordingly, the species integrity is maintained by:
- Van Valen's Ecological Species Concept (1976): Leigh Van Valen defined a species as a lineage (an ancestral-descendant sequence of populations) that occupies an adaptive zone minimally different from that of any other lineage in its range and evolves separately from all lineages outside its range.
- Mechanism of Maintenance: The cohesive integrity of the lineage is maintained primarily by stabilizing ecological selection, while disruptive selection driving ecological divergence into distinct niches leads to the formation of new species. (Correct answer: Option 1)
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