Species splits all over the world as many are aware are rapidly increasing and in a number cases in my opinion completely unjustified.
Classifying a species can of-course be tricky, particularly for disjunct populations with small apparent morphological or behavioural differences. This does not mean however that this necessitates a species split!!!!
A sub-species can only truly be redefined as a full species if it is unable to produce fertile offspring with the nominate species. Often new species splits require this, as morphological divergence is often small (in evolutionary terms) even if phenotypic variation can be relatively large. (some mutations are more frequent etc...)
Genetic differences between sub-species are often so slight that differentiaton on the basis of genetics is unreliable.
Eg:The common gull Larus canus is now I understand being slit up ito mew gull, kamchatkan gull etc. Absurd without verification.
The problem as I see it lies not in the technically accepted way of classifying species but how we view the classification system. Sub-species are not afforded the same consideration or (legal or otherwise) protection
The 'rules' can be 'bent' in my opinion in favour of classifying a bird a full species under threat of extinction or widespread extirpation (as this tends to afford it greater protection). But for birds under no such threat can we please stick to the rules!!!
Perhaps the way forward is to give grades at sub-species level
The criteria of some current re-classifications would allow human races to be divided into seperate species which would of-course be absurd.
Are book publishers sponsoring the people who make these splits?
Classifying a species can of-course be tricky, particularly for disjunct populations with small apparent morphological or behavioural differences. This does not mean however that this necessitates a species split!!!!
A sub-species can only truly be redefined as a full species if it is unable to produce fertile offspring with the nominate species. Often new species splits require this, as morphological divergence is often small (in evolutionary terms) even if phenotypic variation can be relatively large. (some mutations are more frequent etc...)
Genetic differences between sub-species are often so slight that differentiaton on the basis of genetics is unreliable.
Eg:The common gull Larus canus is now I understand being slit up ito mew gull, kamchatkan gull etc. Absurd without verification.
The problem as I see it lies not in the technically accepted way of classifying species but how we view the classification system. Sub-species are not afforded the same consideration or (legal or otherwise) protection
The 'rules' can be 'bent' in my opinion in favour of classifying a bird a full species under threat of extinction or widespread extirpation (as this tends to afford it greater protection). But for birds under no such threat can we please stick to the rules!!!
Perhaps the way forward is to give grades at sub-species level
The criteria of some current re-classifications would allow human races to be divided into seperate species which would of-course be absurd.
Are book publishers sponsoring the people who make these splits?