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Languages : en
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ABSTRACT SAVAGE, AMELIA LEE. Diet of Swainsonââ'¬â"¢s Warblers on the Breeding Grounds. (Under the direction of Dr. Christopher Moorman). Swainsonââ'¬â"¢s Warbler (SWWA), Limnothlypis swainsonii, is a migratory songbird that breeds in bottomland hardwood forests across the southeastern United States. It is believed to be one of the least abundant breeding songbird species in the region. While nest-site selection has been well studied, little is known about SWWA foraging habits except that the species is insectivorous with a large bill used to flip fallen leaves on the forest floor. We captured and crop-flushed SWWA to determine diet, and sampled leaf litter arthropods and vegetation at each SWWA capture location. We compared the proportion of arthropod orders detected in crop-flush samples to the proportion of arthropods collected in the leaf litter to determine which orders were eaten by SWWA more or less than their proportional availability. Although Acari (mites and ticks) and Chilopoda (centipedes) were the most abundant arthropods recorded in the leaf litter samples (51% and 18%, respectively), these orders rarely occurred in crop flush samples. Conversely, Araneae (spiders) and Coleoptera (beetles) were uncommon in leaf litter samples (2% and 5%, respectively) but were the most abundant arthropod orders in SWWA crop flush samples. We conducted binary logistic regressions with the presence or absence of Aranids as the dependent variable and habitat measures as the independent variables. The probability that spiders were present in the leaf litter increased as leaf litter depth increased. Leaf litter depth should be preserved by maintaining closed canopy forests and natural flooding regimes to promote SWWA foraging habitat.
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Languages : en
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ABSTRACT SAVAGE, AMELIA LEE. Diet of Swainsonââ'¬â"¢s Warblers on the Breeding Grounds. (Under the direction of Dr. Christopher Moorman). Swainsonââ'¬â"¢s Warbler (SWWA), Limnothlypis swainsonii, is a migratory songbird that breeds in bottomland hardwood forests across the southeastern United States. It is believed to be one of the least abundant breeding songbird species in the region. While nest-site selection has been well studied, little is known about SWWA foraging habits except that the species is insectivorous with a large bill used to flip fallen leaves on the forest floor. We captured and crop-flushed SWWA to determine diet, and sampled leaf litter arthropods and vegetation at each SWWA capture location. We compared the proportion of arthropod orders detected in crop-flush samples to the proportion of arthropods collected in the leaf litter to determine which orders were eaten by SWWA more or less than their proportional availability. Although Acari (mites and ticks) and Chilopoda (centipedes) were the most abundant arthropods recorded in the leaf litter samples (51% and 18%, respectively), these orders rarely occurred in crop flush samples. Conversely, Araneae (spiders) and Coleoptera (beetles) were uncommon in leaf litter samples (2% and 5%, respectively) but were the most abundant arthropod orders in SWWA crop flush samples. We conducted binary logistic regressions with the presence or absence of Aranids as the dependent variable and habitat measures as the independent variables. The probability that spiders were present in the leaf litter increased as leaf litter depth increased. Leaf litter depth should be preserved by maintaining closed canopy forests and natural flooding regimes to promote SWWA foraging habitat.
Author: Brooke Meanley
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Category : Swainson's warbler
Languages : en
Pages : 104
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Author: Brooke Meanley
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Category : Swainson's warbler
Languages : en
Pages : 412
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Languages : en
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Conservation plans for the southeastern U.S. have identified Swainson's Warblers (Limnothlypis swainsonii) to be among the more vulnerable Neotropical migrants. However, a lack of life history information, in particular breeding, jeopardizes sound management decisions. My study examined a population in Britton's Neck, South Carolina on timberland owned by International Paper Co. From 1999-2001, I conducted a breeding biology study that examined nesting, territory, vegetative, and landscape characteristics. I discovered 98 SWWA nests, 63 of which were active. SWWA nesting success equaled 60% using the Mayfield success estimator. Contrary to the notion of SWWA requiring mature forests to breed, SWWA bred successfully in 20-year old regenerating clearcuts. Multiple brooding, where a pair initiates nesting attempts after their first is successful, was detected in 20% of the pairs. An individual's seasonal fecundity was doubled by multiple brooding, increasing the young per female from 1.5 to 3.7. Brown-headed Cowbirds (Molothrus ater) parasitized only 10% of nests. No SWWA chicks were observed fledging in the presence of Cowbirds. Apparent population density was 17 territories/km2, equaling the highest density ever recorded for SWWA. One-fifth the site contained 59 territories/km2, compared to the remaining four-fifths with 12 territories/km2. I examined vegetative differences between nests built in high- versus low-density areas using a discriminant function analysis (DFA). The DFA results indicated understory thickets accounted for the largest difference between high- and low-density nest sites. Nests in the high-density area were more associated with understory thickets.
Author: Aimlee D. Laderman
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Category : Atlantic white cedar
Languages : en
Pages : 128
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Category : Zoology
Languages : en
Pages : 100
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Author: David N. Wear
Publisher:
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Category : Electronic books
Languages : en
Pages : 652
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The southern forest resource assessment provides a comprehensive analysis of the history, status, and likely future of forests in the Southern United States. Twenty-three chapters address questions regarding social/economic systems, terrestrial ecosystems, water and aquatic ecosystems, forest health, and timber management; 2 additional chapters provide a background on history and fire. Each chapter surveys pertinent literature and data, accesses conditions, identifies research needs, and examines the implications for southern forests and the benefits they provide.
Author: Pete Dunne
Publisher: Houghton Mifflin
ISBN: 0358164079
Category : Nature
Languages : en
Pages : 293
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Book Description
Focusing on families and their shared traits makes bird identification easier than ever. This guide takes readers beyond merely identifying birds to understanding them. Many birders can tell the difference between a White-eyed and Bell's Vireo but cannot begin to describe a vireo and what distinguishes members of this family from warblers or flycatchers. The "species by species" approach makes it difficult to appreciate birds for what they are: members of well-organized groupings united by common traits. Putting the focus on families, and their shared characteristics, makes bird identification easier and more meaningful. More than 150 color photos illustrate the 81 bird families of the United States and Canada.
Author: Irby J. Lovette
Publisher: John Wiley & Sons
ISBN: 1118291050
Category : Science
Languages : en
Pages : 736
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Selected by Forbes.com as one of the 12 best books about birds and birding in 2016 This much-anticipated third edition of the Handbook of Bird Biology is an essential and comprehensive resource for everyone interested in learning more about birds, from casual bird watchers to formal students of ornithology. Wherever you study birds your enjoyment will be enhanced by a better understanding of the incredible diversity of avian lifestyles. Arising from the renowned Cornell Lab of Ornithology and authored by a team of experts from around the world, the Handbook covers all aspects of avian diversity, behaviour, ecology, evolution, physiology, and conservation. Using examples drawn from birds found in every corner of the globe, it explores and distills the many scientific discoveries that have made birds one of our best known - and best loved - parts of the natural world. This edition has been completely revised and is presented with more than 800 full color images. It provides readers with a tool for life-long learning about birds and is suitable for bird watchers and ornithology students, as well as for ecologists, conservationists, and resource managers who work with birds. The Handbook of Bird Biology is the companion volume to the Cornell Lab’s renowned distance learning course, Ornithology: Comprehensive Bird Biology.
Author: Herbert A. Raffaele
Publisher: Princeton University Press
ISBN: 0691199930
Category : Nature
Languages : en
Pages : 289
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An updated edition of the acclaimed field guide to the spectacular birds of the West Indies Birds of the West Indies is the first field guide that covers and depicts all birds known to occur in the region, including infrequently occurring and introduced forms. Now fully updated and expanded, this stunningly illustrated book features detailed accounts of more than 600 species, describing identification field marks, range, status, voice, and habitat. There are more than 100 beautiful color plates that depict plumages of all species—including those believed to have recently become extinct—as well as distribution maps, a color code for endemic birds, and an incisive introduction that discusses avifaunal changes in the West Indies in the past fifteen years and the importance of conservation. Covers more than 60 new species, including vagrants, introductions, and taxonomic splits Updates the status of every species Features illustrations for all new species and improved artwork for warblers and flycatchers Color codes endemic species confined to one or just a few islands Includes many new and enhanced maps Provides bird weights for each species Compact and easy to use in the field
