A) ecotone
B) keystone
C) edge effect
D) critical link species
E) edge species
Correct Answer: A
Solution :
Ecotone is the area of transition between two biotic communities or ecosystems. Ecotone is characterized by the presence of species of both the communities. Edge effect is the characteristic species composition found in the region of ecotone or at the boundary of a community. The species which are most abundant or spend most their time in ecotone or community boundary are known or edge species. Keystone species are non-dominant, less abundant species having characteristically large influence on the community structure and characteristics. Their removal or decrease in number causes destruction in community structure or function. Critical link species play major role in supporting network species by-functioning as pollinators, dispersal agents etc. Tropical ram forests have a number of critical link species.
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