Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"nest failure"”.
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Sources of Nest Failure in Mississippi Sandhill Cranes, Grus canadensis pulla: Nest Survival Modeling and Predator Occupancy
… pulla). Lack of information on sources of nest failure hinders effective management to increase recruitment. I examined sources of nest failure for 54 nests at the Mississippi Sandhill Crane National Wildlife Refuge, 2008-2009. Nest cameras identified predation as the primary source of …
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Breeding Biology of Wilson's Plovers (Charadrius Wilsonia): Reproductive Success, Habitat Use, and Sex Roles
… success rates and how a breeding pair achieves nest success is vital information needed for management of declining populations. Wilson’s Plover, a species of concern in most of the southeastern United States, has low hatching success on Cumberland Island National Seashore, a largely undeveloped …
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Factors influencing ruffed grouse productivity and chick survival in West Virginia
… The proportion of hens that attempted to nest, hen success, average clutch size, and hatch dates were similar between age classes, between sites, and between years. Hatch dates were similar between age classes and between sites. Depredation was the major cause of nest failure. I examined 2 …
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Reproductive ecology of Eastern wild turkey hens in Sussex County Delaware
… mortalities (61.3%, n=19) occurred during the nesting season (15 April-15 June). The variation in annual survival justifies the need for continued monitoring of this population. Nest success has been found to be an important factor in overall population success. Nesting habitat variables and …
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Effects of black flies on wild turkey reproductive success
… Wild Turkeys (Meleagris gallopavo silvestris), nest success and female survival have been found to have the strongest effects on population growth. Previous studies on Wild Turkeys have established that variables such as weather (e.g., precipitation and temperature), landscape composition (e.g., …
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Pheasant Nesting and Vegetation Development in Dense Nesting Cover Established Under the South Dakota Pheasant Restoration Program
Pheasant (Phasianus colchicus) nest use of dense nesting cover (DNC) established under the Pheasant Restoration Program was evaluated in Beadle, Codington, Tripp, and Walworth Counties in South Dakota from 1978 to 1981. Nest densities and success in DNC plots were compared to those found in …
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The Influence of Reduced Forest Cover and Dissolved Oxygen on the Viability of Eggs from Eastern Hellbenders (<i>Cryptobranchus alleganiensis</i>)
… population age structure, and high rates of nest failure. Adult male hellbenders normally provide extensive paternal care to embryos and larvae over an 8-month period. However, researchers have recently discovered that in degraded populations, hellbender nests are failing due to whole-clutch …
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Demography, Nest Site Selection, and Physiological and Behavioral Responses to Overflights and other Human Activities, of Wilson's Plover (Charadrius wilsonia) at Cape Lookout National Seashore, North Carolina
… decline. I studied Wilson's Plover demography, nest site selection, and physiological and behavioral responses to overflights at Cape Lookout National Seashore, North Carolina, where the National Park Service and U.S. Marine Corps recently lowered the altitude for overflights at tactical speeds. …
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Further studies on the breeding biology of redshank (Tringa totanus L.)
… smaller and more likely to hatch last. Nest hatching success varied annually from 30-741, with tidal flooding the main cause of nest failure. In successful nests, hatch success was less variable. Chick size at hatch was positively correlated with egg size. Pre-fledging mortality is …
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Determinants of variation in productivity, adult survival and recruitment in a declining migrant bird : the Whinchat (Saxicola rubetra)
… relatively common. Territory settlement and nesting attempts of colour-ringed individual Whinchats were monitored intensively during 2012-2014. Pairs were significantly more likely to breed in sheltered valleys with long, grassy, structurally diverse vegetation and a high density of tussocks. …
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Nest predation and habitat selection in the grasshopper sparrow (Ammodramus savannarum)
Predation is the leading cause of nest failure for many birds and is an important source of natural selection that shapes avian behavior and life-history traits. However, our understanding of the relationship between habitat characteristics and nest loss and how predation affects nest-site …
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Avian breeding ecology in soybean fields: does no-till provide any benefits?
… to regional bird populations. I compared the nesting success and avian communities in tilled and no-till soybean fields. I found significantly higher densities of birds in no-till fields than tilled fields but no differences in avian communities. Of the 114 nests found, 99 were in no-till …
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The breeding biology and ecology of the White-necked Picathartes <i>Picathartes gymnocephalus</i> temminck 1825, in Sierra Leone
… previously studied in detail. The incubation and nestling periods (20 and 25 days) respectively were longer than is usual for most tropical passerines. In most cases, one clutch of two eggs was laid between June and December, immediately followed by moult between January and May (the dry season). …
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Smallmouth bass mortality during parental care: implications for year-class strength
… relatively low and stable during spawning, and nest success was high (64%). Mortality (attrition) averaged 9.5% per day (range 5.2-13.9%) and 94.1% total (range 80.9-99.5%) for broods that survived to dispersal. Mean DMR for the interval from swim-up to larval metamorphosis (14.0%) was higher …
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Factors affecting foraging by breeding farmland birds
This thesis investigates nesting success, foraging behaviour, chick diet and growth of three ecologically contrasting species (skylark <i>Alauda arvensis</i>, yellowhammer <i>Emberiza citrinella</i> and song thrush <i>Turdus philomelos</i>) on farmland, in relation to microhabitat and the …
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Developmental stress in birds: phenotypic and fitness
… males invested more in parental care and reared nestlings in better condition compared to control males. Developmentally stressed males also sired more offspring and were less likely raise non-genetic nestlings compared to control males. In chapters four and five, I explore the causes and …
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Developmental stress in birds: phenotypic and fitness
… males invested more in parental care and reared nestlings in better condition compared to control males. Developmentally stressed males also sired more offspring and were less likely raise non-genetic nestlings compared to control males. In chapters four and five, I explore the causes and …
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Ecological Factors Associated With Songbird and Small Mammal Predation by Texas Ratsnakes
… avian ecology, predation is the primary cause of nest failure and yet few studies examine predators directly. For my dissertation, I used radio-telemetry to monitor Texas ratsnake (Elaphe obsoleta ) habitat use and behavior to examine predation risk on nests of two endangered bird species breeding …
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The breeding ecology and behavioural adaptations of African black oystercatchers in light of climate change
… factors influence the vulnerability of nesting African Black Oystercatchers Haematopus moquini (oystercatchers) to climate and habitat change. I explore, for the first time, the behavioural adaptations used by the species to cope with breeding in a limited strip of beach, between high …
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Evaluation of Duck Production On Waterfowl Production Areas in Northeast North Dakota
… habitat conditions, breeding populations and nesting were evaluated all four years. Brood observations were made during the last three years and nesting cover was evaluated during the last two years of investigation. Wetland habitat conditions were generally favorable during the first three …
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