[TN-Bird] Re: Dyer County Trumpeter Swans
- From: kde@xxxxxxx
- To: Bill Pulliam <bb551@xxxxxxxxxxxxx>
- Date: Thu, 15 Jan 2009 15:59:37 -0500 (EST)
On Thu, 15 Jan 2009, Bill Pulliam wrote:
...
> Generally under ABA
> rules, an individual of a native species that has been reintroduced
> to a spot within its historic range is "countable" if it was wild-
> hatched.
....
Actually, that is not correct.
The ABA Recording Rules and Interpretations can be found online at
http://www.aba.org/bigday/rules.pdf
From those rules:
(iv) an indigenous species which is reintroduced into an historic
range of the species may be counted when the population meets
the ABA Checklist¢s definition of being established or when it is
not possible to reasonably separate the reintroduced individuals
from naturally occurring individuals;
The ABA rules concerning whether a species is "established" are
determined by the ABA Committee on Exotics. Their criteria are
also available online at
http://www.aba.org/checklist/exotics.html
There are 8 criteria which must be met for a species to be considered
"established".
1) The species is recorded in the form of a published photograph or a
specimen archived in an ornithological collection.
2) There is a more-or-less-contiguous population of interacting or
potentially interacting individuals, rather than a scattering of isolated
individuals or pairs.
3) The population is not currently, and is not likely to be, the subject
of a control program where eradication may be a management goal that is
likely to succeed.
4) The population is large enough to survive a routine amount of mortality
or nesting failure.
5) Sufficient offspring are being produced to maintain or increase the
population.
6) The population has been present for at least 15 years.
7) The population is not directly dependent on human support.
8) A publication, ideally in a peer-reviewed journal or book, describes,
how, when, and where the above seven criteria have been met.
Trumpeter Swan is currently listed as "Extirpated" on the Official List
of the Birds of Tennessee.
Dean Edwards
Secretary, Tennessee Bird Records Committee
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