Doug correctly wrote:
>Sorry,
>
>Plesiomorphic traits are traits that have been passed down through earlier
>taxa. They arose in animals which evolved prior to the animal in question,
>and they continue to manifest themselves, usually because they are
>effective. In the sense of bird (and other animal) communication, we often
>find certain calls that several different, but related, species use - this
>is a plesiomorphic call - it came from a common ancestor. If you are
>familiar with Canyon Towhees and Abert's Towhees, you might hear them both
>use the same complicated duetting call - a call unlike any other bird uses=
.
>They both inherited it from a previous species.
>
>Our human "Flight or Fight" response is a plesiomorphic trait that we
>inherited ultimately from the earliest animals - a very effective tool tha=
t
>survived in nearly all animals.
>
>Plesiomorphic calls are important because they indicate how closely relate=
d
>taxa are and are sometimes an indication of where a particular species
>arose. That's why I pay attention to plesiomorphic vocalizations - they ar=
e
>a way to know who's related to whom and how close that relation is.
>
>Doug
>Doug Von Gausig
>Clarkdale, Arizona, USA
>Moderator
>Nature Recordists e-mail group
>http://groups.yahoo.com/group/naturerecordists
RANT warning! Delete as you wish.
Yes, but the relationships between and among birds are being redefined as
we write. The AOU committee has just re-arranged several major groups
(putting ducks and chickens/quail first just after the Tinamiformes, and
before the Gaviiformes and Procellariiformes) and announced* (see below
attachment, copied from their July 2003 introduction) that they will be
making many huge shifts every July from now on as well, especially among
the small Embrizidae slash Thraupidae slash Fringillidae mess. Several
years ago they reversed the order of all the Tanagers, so finding a tanager=
in a tropical guide depends on exactly when the guide was published!
AOU has now relegated more birds into the taxonomic equivalent of a
trashcan -- "there is now NO real family" called "incertae sedis". As I
understand it, this category means - "you stick these genera and species in=
about here in the list, but they are not necessarily related to the others=
we place in this same trashcan."
So, although what Doug says sounds fair enough for my purposes, he is
assuming the plesiomorphologicality of sound traits, and it is going to get=
trickier and tricker before AOU is done. Taxonomists got where we are now=
by always assuming certain characteristics are non-adaptive (conservative
characteristics). I think we sound-people should now be more and more
suspicious of convergence, especially in evolving communication
systems. Human anthropologists and sociologists have long warned of using=
language as a key to long-term human relationships, because of the
volatility (you Yanks, like me, try reading the latest Harry Potter if you=
think British English isn't rapidly changing).
Of course, in English we call the Spangled Tanager that name to correctly
inform the layman that the bird is in the tanager family. When it becomes=
a sparrow what will we call it? The AOU has a policy of changing all the
English names to be consistent with the family. If you don't believe me,
this July (actually published in September) the familiar "Rock Dove"
officially became "Rock Pigeon" and the ten New World species in the genus=
Columba disappeared from the scene and magically fell into the
unpronouncable Patagioenas. Here was IMHO a case for nomina conservanda
rule to be invoked. All Latin American birders I know use genus and
species, and thus call these birds Columba, and now some bunch of gringo
guys, most of whom have never even been to any Latin American country, are=
telling them how to call birds that ONLY occur in their own
country?? There are no new world members of Otus anymore, either.
Personally, I think the AOU committee are significantly misguided, and I am=
at best skeptical of the effects of all the changes in the elusive goal of=
perfection. I (regret to) predict that their messing with the names will
at the very least add fuel to the anti-conservation movement when we have
currently such a volatile political situation and we probably least need to=
move in the direction of stimulating more anti-intellectualism to obstruct=
the enforcement of The Endangered Species Act. It seems to me it is only
most USA people who do not realize how presumptuous USA people appear! Or,=
maybe I am just getting too old for this S**T. [SET RANT OFF]
my best regards to all,
Marty Michener
MIST Software Associates PO Box 269, Hollis, NH 03049
EnjoyBirds.com - Software that migrates with you. http://www.EnjoyBirds=
.com
*A recent series of papers on genetic relationships of members of the
nine-primaried oscines has shown that some species and genera long
classified in established family groups actually, or probably, are more
closely related to members of other family groups. It has long been
recognized that the distinction between =93tanagers=94 and =93finches=94 is=
problematical; see Notes under Emberizidae in AOU 1998:591. Recent studies=
of mitochondrial DNA (Burns 1997, Burns et al. 2002, Klicka et al. 2000,
Garc=EDa-Moreno et al. 2001, Lovette and Bermingham 2002, Yuri and Mindell=
2002) indicate that some species normally considered to be members of the
Thraupidae are actually more closely related to the Cardinalidae,
Emberizidae, or Fringillidae. Other groups of species seem not to belong in=
the Thraupidae, but relationships with other families are not obvious.
Further, some species traditionally placed in the Emberizidae or Parulidae=
may make these families paraphyletic or polyphyletic in respect to other
families in the nine-primaried oscines. In many instances these studies
complement and support earlier morphological work that questioned
traditional placement but that were inconclusive. The combination of
several lines of evidence often provide compelling arguments that species
and genera are misplaced in the current classification, but do not provide=
equally compelling arguments about where they should be placed. The primary=
reason for this is the limited sampling of taxa either within the misplaced=
groups or among the potential recipient groups. Another related reason is
that different studies may lead to different placement, partly because of
differences in taxon sampling. These studies leave us with varying degrees=
of uncertainty about the relationships of groups that have been studied-not=
to mention those that have not yet been tested. We anticipate that
additional studies, some already under way, will lead eventually to
definitive answers to questions raised by past studies. Meantime, we are
faced with several options. First, we can leave the present classification=
alone, continuing with a system we know to be flawed but that is at least
familiar. Second, we can remove genera from families where genetic data
show that they do not belong and place them into a large and growing group=
of uncertain position (incertae sedis), which admits our ignorance but
results in a mere list rather than a classification. Third, we can remove
genera from families where they do not belong and place them tentatively in=
other families on the basis of genetic evidence, which risks an unstable
classification that may change when more data become available. We have
chosen what we believe is a middle ground, to retain the present sequence
of families and species, but to mark those species that studies have shown=
or suggested should be transferred to another, but still indefinite,
position. In the list of species on pp. xvii-liv of AOU (1998), and on the=
AOU web site, we suggest using the symbol * to mark such species. When
additional studies resolve the relationship of these problematical taxa,
formal changes will be proposed and acted on.
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