South River Bird Study: Are we having fun yet? › ... › srst_7_18_06_birds.pdf · a) More birds...
Transcript of South River Bird Study: Are we having fun yet? › ... › srst_7_18_06_birds.pdf · a) More birds...
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Mid-Summer UpdateSouth River Bird Study: Are we having fun yet?
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Screech Owls
Objectives:a) more adults Hg levelsb) reproductive successc) follow fledglings
Achievement:a) 15 Contaminated and
15 Reference adults for 2005-2006
combined
One failed nest…
Maryse Leandre - NSF biomath student
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Sarah Folsom of Biodiversity Research Institute with Mallard “decoy” trap
Mallards
Objectives:Blood and feathersfrom 15 contaminated and 15 reference adults
Achievement:• Plagued by vandals and flood
• 11 contaminated and 9 reference adults
• Plus 5 juveniles
Live decoy farm duck
Wild pair that hastriggered door
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Carolina Wrens
Objectives:a) Adult Hg levelsb) Collect prey items using
the ligature technique
Achievements:a) 34 Contaminated and
10 Reference adults for 2006
c) 75 prey items collected
• Still trapping and collecting prey items!
Carolina Wren nest in a tube
Nestling Carolina Wren with a ligature being applied
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Belted Kingfishers
Objectives:a) More birds from
the South River
b) Habitat availability inriver reaches without kingfishers
Achievements:a) 20 South River adults
for 2005-2006 (up from 4)plus 27 reference adults
b) Mapped all potential andactual nest sites
Dan Cristol with 7 nestlings at Water Treatment plant. All 7 fledged before thecliff nest was obliterated in the late June flood event.
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Tree SwallowsObjectives:Compare return rate of contaminated and reference birds
Achievements:Approximately 50 adultsreturned; a very high returnrate for any songbird study
3 nestlings returned out of >800!
Reproductive failuresclearly up from 2005.
Tree swallow photographed in the act of hatching
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Eastern Bluebirds
Objectives: Follow and re-trap bluebirds after they fledge
Achievements:• 30 transmitters on 13
nests (1st brood)• Caught 16 fledglings
first round, 13 in second, 12 in third, 1 in fourth
• Still trapping!
Kelly Hallinger, NSF-biomath undergraduate field assistant, with a fledgling bluebird
Fledgling bluebird with transmitter
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Also:
•Collected food items from 10 contaminated bluebird nests•Collected potential invertebrate prey items•First documentation of “second clutching” by tree swallows•Collected clutches from 3 contaminated and 3 reference:
bluebirds, chickadees, swallows, wrens, kingfishers•Collected blood/feathers for isotope study