Pennsylvania Game News - September 2016 - 56

they did not arrive later on winter territories.
In a paper they wrote for the Proceedings of the Royal Society they suggested
some individuals might prepare to migrate
more rapidly than others by investing
more heavily in fat storage during the
early stages of molt.
In a geolocator study of gray catbirds
by Thomas B. Ryder of the Smithsonian Conservation Biology Institution's
Migratory Bird Center, he pointed out
that although geolocators can estimate
longitude fairly accurately, latitudinal
error can be large -108 miles for purple
martins, and between 132 and 192 miles
for wood thrushes.
For this reason, he used both geolocators and bird-banding records "to
estimate the migratory connectivity of
breeding and nonbreeding populations
of gray catbirds," he reported in The Auk,
the official publication of the American
Ornithologists' Union.
In July of 2009, he put 22 geolocators
on gray catbirds in two forest parks
near Washington, D.C. These
birds left their breeding
territory in late August
and early September and
arrived on wintering grounds
in south Florida or Cuba in
mid-October. They left the
following April and arrived
back in the D.C. area in early
to mid-May.
Looking at recovered birdbanding data
that showed
Midwestern
gray catbirds
overwintered exclusively
in Central America and
56

our birds from the Mid-Atlantic overwintered in Florida and the Caribbean,
and combining it with their geolocator
studies, they concluded their research
"underscores the importance of geolocators, as well as other tools, to advance our
understanding of migratory connectivity."
With all this geolocator research, bird
migration is proving to be more complex
and varied than we could have imagined.
A study of the European common
cuckoo using geolocators found them 600
miles away from their usual departure area
in northern Europe. Then each cuckoo
flew by itself on its usual route to wintering grounds in central Africa.
In Scientific Reports researcher Mikkel
Willemoes wrote that, "They [cuckoos]
evaluate their own conditions and adjust
their reactions to it, displaying a complicated behavior that we were able to document for the first time in migratory birds."
A news note about this study in National Wildlife summed it up this way: "This
tells us that bird migration in general is far
more complex than previously assumed."
That's a point we can ponder as
we watch our songbirds head
south, knowing that many
of them will not survive
their migratory journeys and return
to us next
spring.

Wood Thrush



Table of Contents for the Digital Edition of Pennsylvania Game News - September 2016

Contents
Pennsylvania Game News - September 2016 - Intro
Pennsylvania Game News - September 2016 - Cover1
Pennsylvania Game News - September 2016 - Cover2
Pennsylvania Game News - September 2016 - Contents
Pennsylvania Game News - September 2016 - 2
Pennsylvania Game News - September 2016 - 3
Pennsylvania Game News - September 2016 - 4
Pennsylvania Game News - September 2016 - 5
Pennsylvania Game News - September 2016 - 6
Pennsylvania Game News - September 2016 - 7
Pennsylvania Game News - September 2016 - 8
Pennsylvania Game News - September 2016 - 9
Pennsylvania Game News - September 2016 - 10
Pennsylvania Game News - September 2016 - 11
Pennsylvania Game News - September 2016 - 12
Pennsylvania Game News - September 2016 - 13
Pennsylvania Game News - September 2016 - 14
Pennsylvania Game News - September 2016 - 15
Pennsylvania Game News - September 2016 - 16
Pennsylvania Game News - September 2016 - 17
Pennsylvania Game News - September 2016 - 18
Pennsylvania Game News - September 2016 - 19
Pennsylvania Game News - September 2016 - 20
Pennsylvania Game News - September 2016 - 21
Pennsylvania Game News - September 2016 - 22
Pennsylvania Game News - September 2016 - 23
Pennsylvania Game News - September 2016 - 24
Pennsylvania Game News - September 2016 - 25
Pennsylvania Game News - September 2016 - 26
Pennsylvania Game News - September 2016 - 27
Pennsylvania Game News - September 2016 - 28
Pennsylvania Game News - September 2016 - 29
Pennsylvania Game News - September 2016 - 30
Pennsylvania Game News - September 2016 - 31
Pennsylvania Game News - September 2016 - 32
Pennsylvania Game News - September 2016 - 33
Pennsylvania Game News - September 2016 - 34
Pennsylvania Game News - September 2016 - 35
Pennsylvania Game News - September 2016 - 36
Pennsylvania Game News - September 2016 - 37
Pennsylvania Game News - September 2016 - 38
Pennsylvania Game News - September 2016 - 39
Pennsylvania Game News - September 2016 - 40
Pennsylvania Game News - September 2016 - 41
Pennsylvania Game News - September 2016 - 42
Pennsylvania Game News - September 2016 - 43
Pennsylvania Game News - September 2016 - 44
Pennsylvania Game News - September 2016 - 45
Pennsylvania Game News - September 2016 - 46
Pennsylvania Game News - September 2016 - 47
Pennsylvania Game News - September 2016 - 48
Pennsylvania Game News - September 2016 - 49
Pennsylvania Game News - September 2016 - 50
Pennsylvania Game News - September 2016 - 51
Pennsylvania Game News - September 2016 - 52
Pennsylvania Game News - September 2016 - 53
Pennsylvania Game News - September 2016 - 54
Pennsylvania Game News - September 2016 - 55
Pennsylvania Game News - September 2016 - 56
Pennsylvania Game News - September 2016 - 57
Pennsylvania Game News - September 2016 - 58
Pennsylvania Game News - September 2016 - 59
Pennsylvania Game News - September 2016 - 60
Pennsylvania Game News - September 2016 - 61
Pennsylvania Game News - September 2016 - 62
Pennsylvania Game News - September 2016 - 63
Pennsylvania Game News - September 2016 - 64
Pennsylvania Game News - September 2016 - Cover3
Pennsylvania Game News - September 2016 - Cover4
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