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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 33 for “"Brood size"”.
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Effect of predator type, season, brood size, and West Nile Virus infection on the nest defense behavior of male and female Eastern Bluebirds
… by many factors, including a parent's sex, brood size, stage of breeding season, type of predator, and physical condition. Because previous studies have produced conflicting results concerning the effects of these factors on the nest defense behavior of birds, additional studies are needed …
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Possible Role Of Breeding Phenology, Brood Size, And Male Parental Care On The Number Of Nesting Attempts By Female Eastern Bluebirds, A Facultatively Multibrooded Species
… of songbirds attempt to raise two or more broods in a single breeding season. The results of previous studies have revealed much variation among species in the factors that influence the likelihood of female songbirds attempting to raise multiple broods during a breeding season. As such, …
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Reproductive Peformance of Great Egrets (Ardea alba) at High Island, Texas
… Texas. Breeding success, productivity, and mean brood size did not differ between years (U-test, P > 0.05). Fledging success at 21 days showed no significant difference between years, however fledging success at 28, 35, and 42 days decreased significantly between years (~15% reduction at 42 days; …
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Ocorrência, distribuição e reprodução de Cladocera (Crustacea: Branchiopoda) na Baía de Guanabara - RJ, Brasil
… August and September. Greatest parthenogenetic brood size of Penilia avirostris was 11, while Evadne tergestina was found to carry up to 14 embryos per batch. Correlation was found between body length and brood size to Evadne tergestina, but not to Penilia avirostris. Two mouths before …
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Wood Duck Brood Movements, Habitat Use, and Survival Rates on Two Prairie Rivers in South Dakota
… their breeding range throughout South Dakota. Brood ecology may differ from traditional breeding areas, and between areas within South Dakota, due to difference in landscape. Wood duck brood movements, habitat use, and survival were studied by radio-marking hens nesting in boxes on the Big …
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Investigation of pre- and post-zygotic reproductive barriers between two host-plant complex races of the parasitic wasp Cotesia congregata (Say) [Hymenoptera: Braconidae]
… isolation. Development time, emerged brood size, and sex ratios between the races also differed.
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Ecological Causes of Life History Variation Tested by Meta-analysis, Comparison, and Experimental Approaches
… response of parental provisioning behavior to brood size variation played a formative role in the development of life history theory. Yet, the inference of such experiments for explaining among-species differences has always been limited by lack of comparative context. I expanded predictions of …
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Ecological Causes of Life History Variation Tested by Meta-analysis, Comparison, and Experimental Approaches
… response of parental provisioning behavior to brood size variation played a formative role in the development of life history theory. Yet, the inference of such experiments for explaining among-species differences has always been limited by lack of comparative context. I expanded predictions of …
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Natal dispersal and first-year survival in a neotropical migratory songbird
… of season, presence of a cowbird nestmate, brood size, and nestling body condition on the first-year survival probabilities. To date, this is the first study to document that both fledging date and the presence of a cowbird nestmate affect first-year survival in a migratory songbird.
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Investigating the possible change in breeding strategy of African black oystercatchers
… (Haematopus moquini) have a modal clutch size of two eggs but occasionally lay one or three eggs. It has been noted that an increase in frequency of larger threeand even four-egg clutches has occurred over the last few decades. By analysing extensive historical nest records dating back …
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Genetic differentiation of the parasitoid, Cotesia congregata (Say), based on host-plant complex
… larva, is likely to occur in gregarious species. Brood size was not a good predictor of superparasitism in C. congregata, but within-brood male allele diversity indicates either superparasitism or multiple mating by female wasps.
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Productivity of A Resident Giant Canada Goose Flock in Northeastern South Dakota
… were used by geese as nesting sites. Mean clutch size of completed nests was 5.14 in 1974 and 5.26 in 1975. Mean clutch size was 5.38 on ANS and 4.89 on NNS for the 2-year study. At least one egg hatched in 87 percent of the 283 nests located during the study. Larger clutches had a higher …
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Nesting and Brood-Rearing Habitat Selection of Greater Sage-Grouse and Associated Survival of Hens and Broods at the Edge of Their Historic Distribution
… study were to estimate nest survival, hen and brood survival, and associated nest and brood-site habitat selection of sage-grouse in southwestern North Dakota. The study was conducted during the spring and summer of 2005 and 2006 in Bowman County, North Dakota. Nest-sites were monitored to …
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Pheasant Production Using Wild Cocks and Penned Game-Farm Hens
… a successful hen to leave the pen with her brood soon after hatching. Eighty-six percent of all eggs laid were placed in nests. Average clutch size for all nests was 9.7 eggs and for incubated nests 10.2 eggs. Of 213 nests established, 90 percent were incubated. Hens laid an average of 17.1 …
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Great Blue Heron Nesting Biology and Habitat Use On the James River in South Dakota
… Dakota, were investigated in 1980 and 1981. Mean brood size was 3.35 nestlings. The predicted number of feeding trips of adult birds peaked when nestlings were 29 days old. A significant amount of variance in adult feeding trips per hour was accounted for by southerly winds and the time period …
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Effect of nestling sex ratio on the provisioning behavior of adult Eastern Bluebirds (Sialia sialis)
… Kentucky, in 2004. I experimentally manipulated brood sex ratios in 24 bluebird nests, creating female-biased (N = 8), male-biased (N = 5), and control (N = 11) nests. Following manipulation, nests were video-taped to record adult provisioning behavior. Among experimental broods, the provisioning …
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Reversible Germline Dynamics of Caenorhabditis elegans During Exposure to Pathogenic Bacteria
… I show there is a marked reduction in brood size with concomitant reduction in gonad size and the number of nuclei in the germline. I define two processes that are induced that contribute to the decrease in the number of germ cell nuclei. First, I observe that infection with P. …
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Nesting Giant Canada Geese in Western South Dakota
… days in 1976 and 83 days in 1977. Average clutch size was 4.8 eggs per nest in 1976 and 5.0 in 1977. Thirty-three percent of all eggs observed in 1976 and 23% in 1977 failed to hatch. Infertility and desertion were the main reasons that eggs did not hatch. Seventy percent of the territorial pairs …
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Movements, Survival, and Habitat Use of Mallard Broods Hatched from Predator Reduced Nesting Habitats in Eastern South Dakota
… movements of mallard (Anas platyrhynchos) broods from nest site to brood rearing wetlands, and thereafter; to determine survival of broods hatched from SUMP areas; to determine general habitat characteristics of brood rearing wetlands. Three types of SUMP areas were used as study sites …
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Smallmouth bass mortality during parental care: implications for year-class strength
… 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 (p=0.04) than earlier (egg to swim-up, 6.7%) and later (metamorphosis to juvenile, 9.1%) periods. Persistent factors during parental …
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