That species are a natural entity and subspecies are an entity created by humans
should be obvious if you had carefully read my first post.

Species are fixed, separate from each other and form a closed natural unit. 

Subspecies are not a closed unit, they can interbreed and develop new forms
within the species unit.  If a part of the population of a species occurs over a
part of the species range and has developed certain characters common to all the
individuals in that part of the population it has been named a subspecies by
human taxonomists.  It's not a natural division and many subspecies interbreed
and form clines between themselves.  If a subspecies becomes isolated from the
main stem for a very long period of time, it may change enough for it to become
a separate unit that is unable to interbreed with the main stem and thus form a
new distinct species.

Most conservation efforts deal with species, not subspecies.

Best regards
Roger White
Cyprus.

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