In an Ecotone some species have more abundant population as compared to other species or communities...........

Environment and Ecology Concept of Ecosystems

In an 'Ecotone' some species have more abundant population as compared to other species or communities. Such species are called

Edge species

Endemic species

Rare species

Threatened species

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Explanation:

First option is correct.
Ecotone is the transition zone between two communities. The phenomenon of having increased variety and density of organisms at the community border is known as edge effect or principle of edges. The organisms which are adapted to life in the ecotone are called edge species.
Endemic species are plants and animals that exist only in one geographic region.
A rare species is a group of organisms that are very uncommon, scarce, or infrequently encountered.
Threatened species are any species (including animals, plants, fungi, etc.) which are vulnerable to endangerment in the near future.