Pennsylvania Game News - September 2012 - 53

at least 25 to 50 are migratory. In North America, with more than 300 species of dragonflies, approximately nine species in two families — the darners and skimmers — migrate, including the twelve-spotted skimmer, blue dasher, wandering glider, spot-winged glider and black saddlebags. Sometimes a few of these species, predominately black saddlebags, join a common green darner migration or feeding swarm. While many researchers are studying bird migration, the study of dragonfly migration is in its infancy. But Martin Wikelski, a professor of ecology and evolutionary biology at Princeton University, as well as a licensed pilot, along with five colleagues, decided to study whether dragonfly migration is similar to bird migration. They glued miniature radio transmitters four-tenths of an inch long and .01 ounce in weight to the undersides of the thoraxes of 14 common green darners — seven males and seven females — and followed them during their autumn migration using receiver-equipped Cessna airplanes and ground teams. They took the dragonflies from five sites in New Jersey. All were newly-emerged adults still strengthening and developing when the urge to migrate started them on their way south. The 14 dragonflies took off within three minutes after the transmitters were attached. The researchers hypothesized that because the male common green darners often carry the females during copulation, and also capture prey larger than themselves, they would have no trouble carrying a transmitter weighing the equivalent of a paper clip. Although they followed them by receivers on the ground using tracking vehicles and handheld devices and by aerial surveys, it was easier to keep track of them from the air, Wikelski told reporters, “because they move so much. From the ground it’s almost impossible to follow them.” They found that most of the dragonflies traveled on average 38 miles a day, but one did fly 100 miles in a day. The common
SEPTEMBER  2012 

green darners followed the same flyways used by songbirds and raptors along the Atlantic seaboard, gathering around shores and mountain ridges. The researchers stopped surveying individual migration movements when the dragonflies moved out of their driving or flying range, approximately 84 miles from Princeton. Like songbirds, common green darners did not migrate if surface winds were more than 15 miles an hour. Also, they flew on days when the previous night was colder

Probably the best book to  read about common green  darner migration is a lavishly illustrated children’s book  by Laurence Pringle titled  A Dragon in the Sky.
than the night before that, and they stayed put when the nights were warmer. Although they headed south from Princeton, when they reached the Delaware Bay at its mouth, just like songbirds do, they turned north again until they could find a narrower place to cross. They also did not seem to compensate for wind direction, but flew with it, again, like migrating songbirds do. Unlike songbirds, though, common green darners moving northward in the spring have little wing wear, suggesting that they are newly-emerged adults that have never flown the route before. Probably the best book to read about common green darner migration is a lavishly illustrated children’s book by Laurence Pringle titled A Dragon in the Sky. He says that migrating common green darners fly above the treetops and catch strong southeast breezes that enable them to glide much of the way like raptors do. Because they can eat on the wing, they can keep flying even while they catch insects and
53



Pennsylvania Game News - September 2012

Table of Contents for the Digital Edition of Pennsylvania Game News - September 2012

Pennsylvania Game News - September 2012
History of the Whitetail
Table of Contents
Going to the Ducks
A Tribute to Jon DeBerti
You Can’t Call It Back
Cover Story
Last Shot for Pap?
75 Years of Success in Pennsylvania
NASP Students are Hungry for More
Bears and Turkeys
A Natural Connection
The Other Migratory Game Birds
Field Notes
Conservation News
Off the Wire
Another View
The Naturalist’s Eye
Straight from the Bowstring
Fun Game
Lock, Stock & Barrel
Crossings
Pennsylvania Game News - September 2012 - Pennsylvania Game News - September 2012
Pennsylvania Game News - September 2012 - Cover2
Pennsylvania Game News - September 2012 - History of the Whitetail
Pennsylvania Game News - September 2012 - Table of Contents
Pennsylvania Game News - September 2012 - Going to the Ducks
Pennsylvania Game News - September 2012 - 4
Pennsylvania Game News - September 2012 - 5
Pennsylvania Game News - September 2012 - 6
Pennsylvania Game News - September 2012 - A Tribute to Jon DeBerti
Pennsylvania Game News - September 2012 - 8
Pennsylvania Game News - September 2012 - 9
Pennsylvania Game News - September 2012 - You Can’t Call It Back
Pennsylvania Game News - September 2012 - 11
Pennsylvania Game News - September 2012 - 12
Pennsylvania Game News - September 2012 - Cover Story
Pennsylvania Game News - September 2012 - 14
Pennsylvania Game News - September 2012 - Last Shot for Pap?
Pennsylvania Game News - September 2012 - 16
Pennsylvania Game News - September 2012 - 17
Pennsylvania Game News - September 2012 - 75 Years of Success in Pennsylvania
Pennsylvania Game News - September 2012 - 19
Pennsylvania Game News - September 2012 - 20
Pennsylvania Game News - September 2012 - NASP Students are Hungry for More
Pennsylvania Game News - September 2012 - 22
Pennsylvania Game News - September 2012 - Bears and Turkeys
Pennsylvania Game News - September 2012 - 24
Pennsylvania Game News - September 2012 - 25
Pennsylvania Game News - September 2012 - A Natural Connection
Pennsylvania Game News - September 2012 - 27
Pennsylvania Game News - September 2012 - The Other Migratory Game Birds
Pennsylvania Game News - September 2012 - 29
Pennsylvania Game News - September 2012 - Field Notes
Pennsylvania Game News - September 2012 - 31
Pennsylvania Game News - September 2012 - 32
Pennsylvania Game News - September 2012 - 33
Pennsylvania Game News - September 2012 - 34
Pennsylvania Game News - September 2012 - Conservation News
Pennsylvania Game News - September 2012 - 36
Pennsylvania Game News - September 2012 - 37
Pennsylvania Game News - September 2012 - 38
Pennsylvania Game News - September 2012 - 39
Pennsylvania Game News - September 2012 - 40
Pennsylvania Game News - September 2012 - 41
Pennsylvania Game News - September 2012 - 42
Pennsylvania Game News - September 2012 - 43
Pennsylvania Game News - September 2012 - 44
Pennsylvania Game News - September 2012 - 45
Pennsylvania Game News - September 2012 - 46
Pennsylvania Game News - September 2012 - Off the Wire
Pennsylvania Game News - September 2012 - Another View
Pennsylvania Game News - September 2012 - 49
Pennsylvania Game News - September 2012 - 50
Pennsylvania Game News - September 2012 - The Naturalist’s Eye
Pennsylvania Game News - September 2012 - 52
Pennsylvania Game News - September 2012 - 53
Pennsylvania Game News - September 2012 - 54
Pennsylvania Game News - September 2012 - Straight from the Bowstring
Pennsylvania Game News - September 2012 - 56
Pennsylvania Game News - September 2012 - 57
Pennsylvania Game News - September 2012 - 58
Pennsylvania Game News - September 2012 - Fun Game
Pennsylvania Game News - September 2012 - Lock, Stock & Barrel
Pennsylvania Game News - September 2012 - 61
Pennsylvania Game News - September 2012 - 62
Pennsylvania Game News - September 2012 - 63
Pennsylvania Game News - September 2012 - Crossings
Pennsylvania Game News - September 2012 - BB1
Pennsylvania Game News - September 2012 - BB2
Pennsylvania Game News - September 2012 - Cover3
Pennsylvania Game News - September 2012 - Cover4
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