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David,
There are two categories of Ospreys in New South
Wales at present, those that are breeding and those that are not. The
non-breeding birds would constitute those within their first 2-3 years which are
too young to breed and older birds that haven't been able to secure a
territory/mate etc. Whether they comprise separate 'populations' depends
upon how you define the term. One definition is "All individuals of a
species living in more or less intimate association with each other" (Dictionary
of Geological Terms, Dolphin Books 1962). Some non-breeding birds would be
associating with breeding birds at present but whether you would define that as
'intimate' is debatable. Inland records are most likely of young
non-breeding birds dispersing from natal areas.
Regards
Greg
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