Bulletin of The British Ornithologists' Club 2010 130(4):286-301
47499910

A new taxon of Collared Petrel Pterodroma brevipes from the Banks Islands, Vanuatu

Vincent Bretagnolle, Hadoram Shirihai
Vincent
Bretagnolle
&
Hadoram
Shirihai
287
Bull.
B.O.C.
2010
130(4)
Figure
1
(top).
Five
specimens
of
Collared
Petrel
Pterodroma
brevipes
collected
in
Fiji,
in
the
interior
of
Viti
Levu
(University
Museum
of
Zoology,
Cambridge,
UK),
showing
the
basic
colour
variation
in
the
species.
Plumage
types
are
adopted
from
Watling
(1986),
which
were
used
to
score
specimens
and
live
birds
at
sea.
From
right
to
left:
'pure
white'
the
two
right-hand
specimens
(this
category
includes
completely
clean
white-bellied
birds
as
well
as
those
with
a
few
very
indistinct
dark
feather
tips);
'grey
peppering'
the
middle
specimen,
with
variable
dark
mottling
and
dappling,
giving
the
underparts
a
blotchy
appearance,
but
with
a
predominantly
white
belly;
'smoky'
fourth
from
right,
with
variable
grey
wash,
but
ground
colour
still
pale
and
contrasts
with
breast-band,
and
many
birds
appear
faintly
blotched
below
(much
individual
variation
between
this,
the
previous
and
next
categories);
'dark
grey'
the
left-hand
specimen,
with
rather
medium
/
dark
and
uniform
grey
pigments,
and
the
dark
breast-band
is
not
obvious
but
still
detectable
in
most.
No
'extreme
dark
grey'
type
was
found
in
collections
other
than
in
P.
b.
magnificens
(Fig.
2).
The
percentage
of
each
colour
type
is
given
in
Table
2
(Hadoram
Shirihai,
©
Tubenoses
Project)
Figure
2
(bottom).
Five
left-hand
specimens
from
the
Banks
Islands,
northern
Vanuatu
(all
held
in
AMNH)
of
Pterodroma
brevipes
magnificens,
with
left
to
right,
AMNH
216921
and
222193
(both
'extreme
dark
grey'),
216919
(holotype)
and
215400
(both
'dark
grey'),
and
216920
(borderline
'dark
grey'
but
placed
under
'smoky'
because
some
P.
b.
magnificens
can
appear
slightly
paler
grey
below).
The
'extreme
dark
grey'
type
seems
unique
to
P.
b.
magnificens,
it
being
found
in
two
of
the
five
specimens
illustrated
here
(i.e.
40%),
or
in
c.42%
of
birds
scored
during
pelagic
observations
in
the
Banks
(Table
2).
The
right-hand,
pale-bellied
bird
(AMNH
216923)
was
collected
at
the
same
locality
and
on
the
same
date
as
the
others
but
is
not
P.
b.
magnificens
(see
text)
(Hadoram
Shirihai,
©
Tubenoses
Project)