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MOBIRDS-L  November 2002, Week 4

MOBIRDS-L November 2002, Week 4

Subject:

Re: More about Mystery Duck

From:

"Robert J. Mangile" <[log in to unmask]>

Reply-To:

MO Wild Bird Forum <[log in to unmask]>

Date:

Wed, 27 Nov 2002 01:32:29 -0600

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (111 lines)

November 27, 2002

Species hybrids can be tricky, for sure.  I've made various "breed"
crosses in domestic pigeons and have cataloged over one thousand, four
hundred (1400) matings as of this year.  There seems to be a general
inheritance pattern with regards to white feathers. Usually when the
plumage of a given area on one breed is colored (pigmented) and that
same general area is "white" on the other breed, the resulting offspring
usually display pigmented feathers in that general area, i.e., dark
dominates.  It ain't fool proof by any means but it is a good generality
I've learned over the years.

Assuming that the above generality is correct, the hybrid duck in
question displays a mostly white "cheek" all the way to its bill and
even extending "above" the eye - just a little; hence, both species
involved in the "blind folded" union (as per Dorothy Lambert!!) must
have had white in that area.  The Barrow's Goldeneye has white clearly
extending above the eye, in direct contact with the black bill and above
the top of the bill.  (I'm only looking at field guides.  I don't have
museum specimens in hand!)

If that reasoning is applied to the wing and side coloration of the
birds involved, my thoughts tell me that the Ruddy and Hooded Merganser
are out of the picture - no white sides.  But the male Bufflehead
displays some or much white on its side, (depending on the season), and
has other white areas in its plumage.

Another thing learned in cross breeding is that large, wide based bills
tend to be dominant characteristics.  Heavy billed x small billed
hybrids tend to display large, broad based bills.  Again, the hybrid
duck in question doesn't have the large, wide based bill of the Ruddy;
and the Common Goldeneye tends to have a little larger bill that the
Barrow's, but more importantly it is black - as displayed in the hybrid
duck.

There is a problem with the absence of the "black spur" displayed at the
Barrow's neckline and the pigmented (black) portion of the upper wing
but hybrids don't inherit characteristics with considerations for
pictures in a book.

The pictures of the Barrow's Goldeneye tend to show a raised region on
the back of the head and that might be a characteristic said to have
been displayed in the hybrid duck. The dark eye is displayed in both the
Bufflehead and the hybrid duck.  The bill is similar to the Barrow's
Goldeneye but it shows a resemblance to the Hooded Merganser, too.

Also, the Goldeneye x Bufflehead is an intra-generic paring (as opposed
to inter-generic parings); lending to better potential chromosome
balance. In generic crosses the offspring have less chance to survive
due to chromosome imbalance - females fare less well that males.  But
after all the guess work we will probably never be certain without DNA
testing - assuming that wildlife scientists don't do much "test
breeding" to learn more about the many plumage variants in wild species.

This is growing much too long.  Just thought I'd offer my reasoning
behind my "guess" at the hybrid.  Did I mention that it was cold today,
and that I was sorta bored!

Bob Mangile
--

> Robert Fisher wrote:
>
> The suggestions, Bufflehead x Ruddy, Tufted Duck X Am. Goldeneye and
> Bufflehead X Barrow's Goldeneye all make some sense. David Castaner's
> description included elements of most of those species. For example,
> he mentioned that the head seemed greenish (like a Goldeneye). He also
> mentioned that the tail seemed somewhat stiff, like a Ruddy. He also
> said  that the head had a hint of a crest at times, like a merganser,
> but at other times lay flat. (The description thus supports several
> hypotheses).
>
> I have cropped the pictures to make the file smaller. The whole
> pictures show  scaup, goldeneye and a ruddy in relation to the mystery
> duck.
>
> A second cropped picture set at higher resolution is attached, as are
> the uncropped larger versions.
>
> For me, the white in the head seemed wrong for Bufflehead, and the
> white on the sides seemed wrong for Barrow's Goldeneye, but right for
> Common Goldeneye and especially Tufted Duck. I guessed Common
> Goldeneye X Hooded Merganser because they are known to hybridize, but
> the white in the face does look more like a drake Ruddy in alternate
> plumage. (Unfortunately, it seems whiter than a Ruddy in basic
> plumage.  Compare the sleeping Ruddy on the right side of one of the
> pictures.) In support of my Hooded Merg. hypothesis, there is a hint
> of cinnamon just under and behind the white in one picture.
>
> See if these additional photos help.
>
>
>                               Bob Fisher
>                         Independence, Missouri
>                         [log in to unmask]
>

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