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 50 for “"hatchlings"”.
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Social context affects behavioral responsiveness to maternal alarm calls in Bobwhite quail chicks
… in socially-reared, socially-tested hatchlings across the first 96 hours following hatch. No significant age effects were revealed. Hatchlings tested at 24 hours did not differ significantly from birds tested at 48, 72, or 96 hours on the two principle behavioral measures (number of …
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Maternal Effects and Offspring Behavior: Potential Contributors to the Lack of Recruitment in Mississippi Gopher Tortoises (<i>Gopherus polyphemus</i>)
… any other part of the species’ range , and most hatchlings die within the first year. There are few refuges where survival and hatching success is high. Here I compare two populations that differ in recruitment and offspring survival for differences in corticosterone. Corticosterone is a hormone …
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Extra-pair paternity within the female-defense polygyny of the lizard, Anolis carolinensis: Evidence of alternative mating strategies
… over a 4-month breeding season. Paternity of hatchlings in 16 naturally occurring breeding groups was analyzed to determine the extent to which the territorial resident male was able to prevent other males from fathering offspring of his resident females. Lizards residing in or neighboring a …
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Reproductive Ecology and Hatchling Behavior of Olive Ridley Sea Turtles in Honduras
… I also assessed the effects of retaining hatchlings for 24 hours after emergence. Incubation temperatures were higher, and hatching success was lower, in the hatchery compared to the beach. Mean nest temperature during the second third of incubation was a good predictor of hatching …
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Habitat preferences of the eastern fence lizard, Sceloporus undulatus, in southwestern Virginia
… distinguished lizard-centered from random sites. Hatchlings were associated with relatively high temperature at perch height (23 °C), relatively high amounts (per 1- m2) of coarse woody debris (15%) and bare ground (15%), and relatively low amount of litter (34%). Adults and juveniles were …
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Nest Emergence and Chemosensory Mediated Predator Avoidance: Two Studies of Behavior in the Red-Eared Slider (Trachemys Scripta Elegans)
… surface temperature above that of the next, hatchlings either did not emerge or emerged erratically as individuals or in small groups. However, when the surface temperature was allowed to drop below that of the nest, the hatchlings emerged en masse. In a second experiment the response of …
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Chemical Evidence for Dietary Toxin Sequestration in the Asian Snake <i>Rhabdophis tigrinus</i>
… their embryos with these toxins so their unfed hatchlings possess defensive bufadienolides prior to consuming toads themselves. All of the hatchling <em>R. tigrinus</em> from an island with a dense population of toads were chemically defended regardless of their diet in the laboratory. In …
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Reproductive success of sea turtles nesting on Wabasso Beach, East-Central Florida
… an estimated 70,469 loggerhead sea turtle hatchlings per year (8,808 hatchlings/km), and 535 green sea turtle hatchlings per year (66 hatchlings/km). The number of loggerhead sea turtle hatchlings produced per nest was adversely affected by beach-side development.
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Incubators for Species which Exhibit Temperature-Dependent Sex Determination: Application to Hawksbill Sea Turtles in Rising Ambient Temperatures
… that will produce a higher percentage of male hatchlings to help rectify this imbalance in habitats heavily affected by climate change. These incubators are designed to be affordable, easy to build and, most importantly, safe for the sea turtle eggs. Three-month-long temperature trials for the …
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Size-structured competition and predation in red-eyed treefrog tadpoles
… were greater per individual competitors while hatchlings were greater per gram competitors. When predators were added, dragonflies reduced survival and growth of hatchlings substantially, but had no effect on large tadpoles. Further, dragonflies reduced hatchling growth more when other …
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Effects of early and delayed visual experience on intersensory functioning in bobwhite quail chicks
… onset of visual experience of avian embryos and hatchlings. Normally reared bobwhite quail chicks are known to require only maternal auditory cues to direct their social preferences in the first days following hatching. However, by 3 days following hatching quail chicks require both auditory and …
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Hypoxia and Ventilation of the Marsupium in the Amphipod, Gammarus Pseudolimnaeus Bousfield
… on the water surface. Brooding of hatchlings may protect hatchlings from this hazard, although hatchlings removed prematurely from the marsupium were not more likely to become trapped than those released normally. The probability of trapping decreased with increasing size of the …
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Effects of Habitat Quality on Reproduction in Two Georgia Populations of Gopherus Polyphemus
… (4) Are females providing equal resources to hatchlings and is hatchling growth potentially being modified by habitat quality affecting adult size and age to sexual maturity? Tortoises were captured by bucket trapping and hand trapping. Radio-graphs were used to obtain information about female …
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Incubation Temperature Affects Body Size, Energy Reserves, and Sex of Hatchling Alligators
… study of inter-clutch variation in sex ratio of hatchlings incubated at the same temperature.</p><p>Aingator eggs were collected within several days of laying in June, 1991, at Rockefeller Wildlife Refuge, southwestern Louisiana, USA. Three clutches of eggs were incubated over the viable range of …
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Valproic Acid-Induced Teratogenesis in Japanese Rice Fish (Oryzias Latipes) Embryogenesis
… neurocranial and splanchnocranial cartilages of hatchlings that had been exposed prenatally. The length of neurocranium, quadrate, ceratohyal and basibranchial 1–3 were all reduced in hatchlings of both groups E (0–2 pdf) and L (4–6 dpf). Trabeculae, epiphyseal bar, anterior orbital cartilage and …
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Effects of Infection of the Protist Parasite, Dermomycoides sp., in Dusky Gopher Frog Tadpoles
… sevosa</em> to 50 zoospores/µL as eggs, embryos, hatchlings, and 2-weeks post hatching tadpoles. Hatchlings (17 days, SE = 2.09 days) and tadpoles exposed 2-weeks post-hatching (17.65 days, SE = 1.48 days) had a significantly lower days to mortality than tadpoles exposed as eggs(27.56 days, SE = …
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Life history evolution of the lizard Sceloporus scalaris: comparisons of lowland and montane populations
… stages 32-33, clutch sizes are relatively large, hatchlings are relatively small, and more than one clutch is produced per season. In contrast, montane populations retain eggs to embryonic stages 36-38, clutch sizes are relatively small, hatchlings are relatively large, and only one clutch is …
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Phenotypes and Survival of Hatchling Lizards
… in ways that potentially affect the fitness of hatchlings. The physical conditions that embryos experience within the nest affects development, hatching success, and hatchling phenotypes. Thus, the nest site that a female selects can influence the survival of her offspring as well as her overall …
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Constraints on the Evolution of Viviparity in the Lizard Genus Sceloporus
… effects of retention on embryonic development, hatchlings, and gravid females. Results indicated that the proximate constraints on longer retention times and viviparity are 1) embryonic development becomes arrested or severely retarded in utero, and 2) the ability to maintain gravidity past the …
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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>)
… times, and higher rates of underdeveloped hatchlings in hellbender populations with degraded riparian forest cover. However, I found no relationship between embryonic viability and whole-clutch filial cannibalism. I concluded that elevated specific conductance of water (i.e., dissolved …
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