Mark Lindberg, Brandt Meixell, & Tim Spivey Institute of Arctic Biology, UAF USGS, Alaska Science...
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Transcript of Mark Lindberg, Brandt Meixell, & Tim Spivey Institute of Arctic Biology, UAF USGS, Alaska Science...
Health and Ecology of Mallards Wintering on the Chena River
Mark Lindberg, Brandt Meixell, & Tim SpiveyInstitute of Arctic Biology, UAFUSGS, Alaska Science Center
Mallard
Anas platyrhynchos
One of the most abundant and ubiquitous ducks in North America – 25 million?
Migration – Minto Flats
Wintering Further North - Fairbanks
Why? Open water
▪ Warm water effluent Feeding
▪ Timing of increase - organized feeding (1 Nov)
▪ Banding data▪ Most Aug and Sep birds
appear to migrate
▪ Diet (Stable Isotopes)▪ Data from Anchorage
(numbers and weights)
Christmas Bird Count Trends
0
100
200
300
400
500
600
700
Year
# o
f bird
s
1995
1997
1999
2001
2003
2005
2007
2009
2011
0
500
1000
1500
2000
2500
3000
3500
4000
Year
AnchorageFairbanks
Organized Feeding(1 Nov – 1 May)
~5x IncreaseSince 2005
~1/2x since 2005
Opportunity – Yes and No
How does bird flu affect wild birds?
Repeatedly capture individuals through winter Influenza and antibody
response Condition (Mass)
What are costs or benefits of wintering further north?
Avian Influenza Factoids
Naturally occurring Type A virus in waterbirds Can infect poultry, other birds, other animal – rarely
humans Low and High Pathogenic forms In humans
Mostly from poultry, no know infections from wild birds Rarely between humans H5N1 – 600 cases since 2003 First case in Americas (Canada – Jan 2014, recent travel to China)
Methods
Monthly captures from August – May 2012-2014 Swim-in traps and
propelled nets After Capture
Banding, measure, weigh, swabs, and blood
Release in Chena
Results - Banding
Augus
t
Septe
mbe
r
Octobe
r
Novem
ber
Decem
ber
Janu
ary
Febru
ary
Mar
chApr
il0
10
20
30
40
50
60
70
2013.Recap
2013.Cap
Month
2013/2014158 Banded67 Recaptures(48 Resightings)
Augus
t
Septe
mbe
r
Octobe
r
Novem
ber
Decem
ber
Janu
ary
Febru
ary
Mar
chApr
il0
20
40
60
80
100
120
140
2012.recap
2012.cap
Month
# o
f bird
s ca
ug
ht
2012/2013272 Banded37 Recaptures
Results - MassAug
ust
Septe
mbe
rO
ctob
erD
ecem
ber
Febr
uary
Mar
ch
April
600.0
800.0
1000.0
1200.0
1400.0
1600.0
1800.0
AHY M
AHY F
HY M
HY F
Month
Ma
ss (
g)
Augus
tSep
tem
ber
Oct
ober
Nov
embe
rD
ecem
ber
Janu
ary
Febr
uary
Mar
chApr
il
600.0
800.0
1000.0
1200.0
1400.0
1600.0
1800.0
Month
Feb Mass in Anchorage~300g lighter
2012/2013 2013/2014
1kg = 2.2lbs
Results – Diet (You Are What You Eat)
8/14
/13
9/3/
13
9/23
/13
10/1
3/13
11/2
/13
11/2
2/13
12/1
2/13
1/1/
14
1/21
/14
2/10
/14
-28
-26
-24
-22
-20
-18
-16
-14
-12
-10
(HY)
(n = 2)
(Corn signature range)
Date
13(‰
) d
C
Results - AI
Analyzed at MITOnly for 2012/13 so farSerology - some infection during
winter
Aug (35)
Sep (60)
Oct (236)
Nov (0)
Dec (144)
05
101520253035
% Positive
Summary Number of mallards wintering
on Chena have increased from organized feeding
Birds in great condition Overfed? AI infection low
Increased risk of disease and spread Concentrated Food and feces mix avian cholera, duck plague –
DVE) Migration is OK
Concerns about domestic birds AI transfer Hybridization
Future of power plant Be Informed
Future
Limited effort on Chena next year
Collaborating with ADF&G on Anchorage study
Thanks: USGS, Alaska Science Center, USFWS, Yukon Flats NWR, M. Bertram, A. Brinkman, M. Cameron, B. Lake, M. Zarzyki
Other Winter Residents