Nasal saddles on ducks
We have been nasal saddling ducks since 1993 to study
movements and migration, survival rates and fidelity rates to winter
grounds, and other aspects of duck bio-ecology. We started with Anas
platyrhynchos (see total captures and resights),
during 1998 also with Anas penelope, A. strepera, A. acuta and
A. clypeata.
On 1999 we started with A. crecca and A. querquedula. During
the winter 2002/2003 we marked Anas carolinensis, hybrid Anas crecca x
carolinensis and we started to nasal saddle Aythya fuligula. We
already also marked one hybrid Anas ?specularioides x specularis?,
Aythya collaris and Aythya ferina. Our resightings and also some hundred
recaptures of marked birds did not show any apparent problems for the birds
in terms of survival, pairing success or behaviour. There is a natural
initial discomfort (also with metal ring…), but most birds have a normal
behaviour after few minutes. We have many resightings of migrant ducks
returning to the capture place in latter years and we recaptured ducks
marked more then 5 years before and they all were fine! On early 2007 was published a
scientific paper studying the possible effects of nasal saddles on ducks
(none...) - click here for the reference.
The 2008 reference show the importance of learning how to correctly apply
saddles.
We control birds with the help of telescopes,
since with binoculars we only can read codes
of birds at very close distances. Nasal saddling is probably the most
efficient marking process on ducks, but there is a limitation of the
distance you have to reach the marked duck to read alpha-numerical codes (+-350 m
with a 30x-90x telescope). As you can see in the photos the code is normally
repeated in both sides and in the front, allowing the reading of codes in
all of those sides. We use series with 1 or 2 letters and/or numbers number
(and also +, - and =, see photos). On Mallard, Shoveler, Pintail
and Wigeon with
white colour, we started to use different combinations of codes: – lateral
codes are equal but different from the front code. Like this we increase the
total number of combinations for the same colour (see photos).
During the winter 2005/6 we started to use the
same with Teal on white, introducing the LASER printed codes, although we
still apply a layer of ink with a pen to increase readability. The new
printing process also allowed us to use more symbols (see
LASER saddle photos - Mallard codes after
the crecca and querquedula photos. Wigeon LASER codes and
photos (only male has LASER print) are after the Mallard. On Gadwall we used
codes similar to Wigeon or codes with 2 digits - in this case, repeated in
all sides. In 2009 shovelers were marked with one digit repeated laterally
but different in front, like in wigeons), and
tufted ducks start to receive LASER printed saddles during 2011, using the
H series.
Colours we
use are:
Anas platyrhynchos – white, red, yellow and light blue;
Anas crecca – red, yellow (only one letter), white and light blue
(see Note below);
Anas carolinensis – red;
Anas querquedula – red, light blue, white;
Anas penelope – white, red, light blue;
Anas strepera – red, light blue, white;
Anas acuta – red, white, light blue;
Anas clypeata – red, white;
Aythya collaris – red;
Aythya ferina - red;
Aythya fuligula – red.
Note: - some colours can be difficult to split on not so
good light conditions. On most situations there will be no problem since
there aren't similar colours on the same species. On teal there can be some
mistakes between yellow/white and light green/light blue. The yellow and
light green are Teals marked in France (see bellow)
and can be easily split from the white and light blue
(marked in Iberia), through the
codes used: - in France the codes can have 1 digit equal laterally but
without code in front, or 2 digits equal laterally and only 1 digit in front
. In Iberia, teal saddles can have 1 or 2 digits but are equal in
all sides, except in white where are used also 1 digit equal laterally and 1
different digit in front (in case of French teals, 1 digit saddles don't
have front code).
I will be very grateful if you send me information about resightings of our
ducks. Please indicate code and colour of the saddle, sex of the bird, the
date and hour, place (with coordinates in Lat Long) and country of
resighting.
Other projects using nasal saddles on ducks in Europe can be found at:
http://www.oncfs.gouv.fr/Teal-research-program-ru141
http://www.mujweb.cz/veda/aythya/
Other projects of marked ducks and other bird species on Europe can be found
at:
http://www.cr-birding.be
And their photos at:
http://www.crb-photoguide.com/
Scientific studies about nasal saddles on ducks:
2001. Rodrigues, D.J.C., Fabião, A.M.D. & Figueiredo, M.E.M.A. The use of nasal markers for monitoring Mallard populations. Pages 316-318 in R. Field, R.J. Waren, H. Okarma, and P.R. Sievert (eds.). Wildlife, land, and people: priorities for the 21st century. Proceedings of the Second International Wildlife Management Congress. The Wildlife Society, Bethesda, Maryland, USA. (copies can be obtained through me)
2007. Guillemain, M., Poisbleau, M., Denonfoux, L., Lepley, M., Moreau, C., Massez, G., Leray, G., Caizergues, A., Arzel, C., Rodrigues, D. & Fritz, H. Multiple tests of the effect of nasal saddles on dabbling ducks: combining field and aviary approaches. Bird Study 54: 35-45 (copies can be asked to matthieu.guillemain@oncfs.gouv.fr).
2008. Guillemain, M., Lepley, M., Massez, G., Caizergues, A., Rodrigues, D. & Figueiredo, M. Addendum: Teal (Anas crecca) nasal saddle loss in the Camargue, France. Bird Study 55: 135-138 (copies can be asked to matthieu.guillemain@oncfs.gouv.fr).
Scientific paper showing nasal saddles efficiency on ducks:
Last updated in 23/03/11
Contact:
David Rodrigues (PhD)
Coordinator for duck nasal marking in Europe, from
DSG (WI/IUCN)
Departamento Florestal
Escola Superior Agrária de Coimbra
3040-316 COIMBRA
PORTUGAL
drodrigues@esac.pt (If you have problems with this e-mail account
please send e-mail to djrodrigues@gmail.com
)
Phone: (351) 239 802 285
Fax: (351) 239 802 289; 239 802 979
