overview of fire effects on avian communities€¦ · overview of fire effects on avian communities...
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Overview of Fire Effects on Avian Communities A Mid-Atlantic Coastal Plain Perspective
Ron Gutberlet
Salisbury University
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Mid-Atlantic States (one of many definitions) http://en.wikipedia.org/wiki/File:US_Mid-Atlantic_states.png
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Atlantic Coastal Plain http://en.wikipedia.org/wiki/File:Atlantic_Coastal_Plain.svg
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Birds of the Mid-Atlantic
State Number of Species
Delaware www.dosbirds.org/statelist
405
Maryland www.mdbirds.org/mddcrc/pdf/mdlist.pdf
447
New Jersey http://njbrc.net/documents/NJStateList.pdf
468
New York http://nybirds.org/Publications/ChecklistNYS.htm
480
Pennsylvania http://birdcountry.us/State Bird Lists/Pennsylvania Bird List.pdf
407
Virginia http://www.bubo.org/Checklists/virginia-avian-records-committee-varcom.html
455
West Virginia http://www.brooksbirdclub.org/records.html
358
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Extinct Birds of the Mid-Atlantic
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Heath Hen An extinct “fire bird”
“Fire created the Heath Hens’ home, just as it creates the Greater Prairie-Chickens’ home. Set by lightning strikes, Native Americans and, on Martha’s Vineyard, blueberry farmers, fire kept forests from establishing themselves, thus generating the brushy scrub-oak and berry-bush barrens Heath Hens needed for foraging and nesting, as well as the meadows needed for booming grounds or leks.” --Christopher Cokinos Hope is the Thing with Feathers (2000)
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Brawn et al. 2001. The Role of Disturbance in the Ecology and Conservation of Birds. Annual Review of Ecology and Systematics 32: 251-276.
“40% of North American bird species associated with some type of disturbance-mediated habitats were significantly decreasing between 1966 and 1998.”
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Maryland Bird Habitats Influenced by Disturbance • Loblolly Pine Woodland
• Shrub Meadow
• Fallow Field
Ellison, W.G. 2010. Second Atlas of the Breeding Birds of Maryland and the District of Columbia. The Johns Hopkins University Press.
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Loblolly Pine Woodland in MD
• Medium to tall open woodland
• Loblolly Pine, Willow Oak, American Holly, Sweet Gum
• Chuck-will’s-widow
• Brown-headed Nuthatch
• Yellow-throated Warbler
• Pine Warbler
• Red-cockaded Woodpecker
Ellison, W.G. 2010. Second Atlas of the Breeding Birds of Maryland and the District of Columbia. The Johns Hopkins University Press.
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Maryland has one species—but has lost the other two—that are nearly endemic to the Southeastern Pine Savannas.
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Engstrom et al. (1984)
• 15-year study of fire suppression
• Florida pine woodland
• Loss of herbaceous understory
• Hardwood encroachment
• Loggerhead Shrike and Bachman’s Sparrow lost within 9 years
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Shrub Meadow in MD
• Late successional grasses, forbs, and shrubs
• Sweet gum, oaks, cherry, sassafras
• Goldenrod, asters
• Fescue, switchgrass, broomsedge
• Northern Bobwhite, American Woodcock, White-eyed Vireo, Gray Catbird, Brown Thrasher, Cedar Waxwing, Prairie Warbler, Yellow-breasted Chat, Eastern Towhee, Field Sparrow, Blue Grosbeak, Indigo Bunting, American Goldfinch
• Many of these species occur in young pine plantations also.
• Succession continues in the absence of disturbance.
Ellison, W.G. 2010. Second Atlas of the Breeding Birds of Maryland and the District of Columbia. The Johns Hopkins University Press.
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CBC Trends
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CBC Trends
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Fallow Fields in MD
• Some are planted to warm weather prairie grasses.
• Others may contain many non-native grasses and forbs.
• Northern Bobwhite, Common Yellowthroat, Grasshopper Sparrow, Indigo Bunting, Blue Grosbeak, Dickcissel, Eastern Meadowlark, Red-winged Blackbird
• Have become uncommon
• Modern agricultural practices
• Development
• Succession
• Succession continues in the absence of disturbance.
Ellison, W.G. 2010. Second Atlas of the Breeding Birds of Maryland and the District of Columbia. The Johns Hopkins University Press.
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Chester River Field Research Center Queen Anne’s Co, MD
Courtesy of Dan Small
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Restoration
• 228 acres converted to native warm season grasses
• Fields were enrolled in state and federal conservation programs
• Experimental design - 12 fields
• Fields were planted in replicate fashion
• Combinations of grass species and planting rates designed to attain varying heights
1999 - present
Field #
Seed Mix
Grasses
Seed Rate (lbs/acre)
1 and 6 Short Little Bluestem 4
Sideoats Grama Grass 2
Deer-Tongue Grass 2
Blue Grama Grass † ?
2 and 7 Moderately Short Little Bluestem 4
Big Bluestem 2
Eastern Gama Grass 2
3 and 5 Tall Little Bluestem 2
Big Bluestem 2
Indian Grass 4
4 and 8 Moderately Tall Eastern Gama Grass 4
Switch Grass 2
Red Fescue* 2
Tall Fescue*† ?
9 through 12 Mid-height Coastal Panicum 4
Little Bluestem 3
Indian Grass 1
Courtesy of Dan Small, Chino Farms, QA Co, MD
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Courtesy of Dan Small, Chino Farms, QA Co, MD
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Management
Challenges: • How to maintain high
plant biodiversity? • How to control
dominating species?
Methods: • Fire • Disking • Chemical herbicides • Rotational Grazing
Courtesy of Dan Small, Chino Farms, QA Co, MD
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Courtesy of Dan Small, Chester River Field Research Center (Chino Farms), QA Co, MD
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Courtesy of Dan Small, Chino Farms, QA Co, MD
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Henslow’s Sparrow
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Henslow’s Sparrow
• Wet meadows, weedy fallow fields
• Management recommendations
• Multiyear accumulation of litter (Robins, 1971)
• Standing dead vegetation (Zimmerman, 1988)
• Scattered medium and heavy-stemmed forbs or shrubs (Hands et al., 1989)
• Periodic disturbance to set back succession and retain dense, low vegetation
Robbins, C.S. and E.A.T. Blom. 1996. Atlas of the Breeding Birds of Maryland and the District of Columbia. University of Pittsburg Press.
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Courtesy of Dan Small, Chino Farms, QA Co, MD