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 40 for “"Hatchling"”.
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Phenotypes and Survival of Hatchling Lizards
The phenotypes of hatchling reptiles are influenced by the environmental conditions that embryos experience during incubation, by yolk invested into the egg, and by the genetic contributions of the parents. Phenotypic traits are influenced by these factors in ways that potentially affect the …
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Incubation Temperature Affects Body Size, Energy Reserves, and Sex of Hatchling Alligators
… the morphometries, mass, and energy reserves of hatchling alligators. The effect of incubation temperature on hatchling genitalia was also studied. I evaluated and tested a method for determining the sex of hatchling alligators. Large scale incubation of alligator eggs allowed a study of …
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Reproductive Ecology and Hatchling Behavior of Olive Ridley Sea Turtles in Honduras
… I investigated the reproductive ecology and hatchling behavior of the olive ridley (Lepidochelys olivacea) sea turtle population nesting in Pacific Honduras. I begin by reviewing olive ridley reproduction, human use of this species, and past and present conservation on nesting beaches. I also …
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Influence of Diet on Growth and Health of Captive Hatchling Gopher Tortoises (Gopherus polyphemus)
… of diet on growth and health of captive hatchling tortoises, we compared growth rates, sprint speeds, and blood chemistry parameters of gopher tortoise hatchlings reared on four different diets over a period of 168 days. Tortoises fed Mazuri brand tortoise diet or a mixture of horse feed …
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From nesting to emergence: Environmental drivers of hatchling success in Blanding’s turtles and implications for management in Southeast Michigan
… conditions influence emergence success and hatchling condition. Nesting females were morphologically similar in size and produced average clutch sizes for the species (8 ± 2 eggs). Nest sites were found on relatively open, disturbed uplands with sandier soil substrates. Emergence success was …
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An investigation into the role of cannabinoid and group 1 metabotropic glutamate receptors in the control of rhythmic locomotion in hatchling Xenopus Laevis
The group 1 metabotropic glutamate receptors (mGluR1/5) are of key interest in the synaptic plasticity that underlies learning and memory and have been implicated as a cause or target in many disease models such as Parkinson’s, Huntington’s, Alzheimer’s, depression, schizophrenia and fragile X …
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Reproductive success of sea turtles nesting on Wabasso Beach, East-Central Florida
… were excavated and inventoried to determine hatchling emergence success. Parametric multiple regressions, nonparametric multiple regressions, and logistic regressions were used to determine the effects of several measured variables on clutch sizes and incubation times; and nesting, hatchling …
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Biologia reprodutiva e desenvolvimento dos filhotes de cágado amarelo Acanthochelys radiolata (Mikan, 1820) em cativeiro (Reptilia: Testudines: Chelidae)
… the mating period, posture, egg incubation and hatchling of the young of Acanthochelys radiolata, six males and ten females from several regions of the State of Rio de Janeiro were observed in a stand at the Fundação Jardim Zoológico da Cidade do Rio de Janeiro (RIOZOO). Daily observations, 15 …
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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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Size-structured competition and predation in red-eyed treefrog tadpoles
… the density and relative proportion of large and hatchling tadpoles in a response surface design and quantified growth. We then observed the effect of a dragonfly larvae predator (Anax amazili) on tadpole growth and survival at different size-structured treatments. Large tadpoles were greater per …
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Variation in Egg Components: A Study of Maternal Investment and Resource Partitioning in the Nesting Loggerhead Sea Turtle; Estimating Genic Variation and Mapping Genetic Lineage of a Rare Captive Helodermatid Population: <em>Heloderma Horridum Charlesbogerti</em>
… on no seasonal change in dried egg components, hatchling size was conserved across the nesting season. This study shows that maternal condition declined across the nesting season and this decline correlated with the decrease in egg size, specifically the amount of water allocated to eggs. Late …
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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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Maternal Plasma and Corresponding Egg Yolk Hormone Variation within a Clutch and Across the Nesting Season of the Loggerhead Sea Turtle (Caretta Caretta)
… In previous studies, significant effects on hatchling phenotype, sex and survival have been attributed to a variation in egg yolk hormone levels. The differential allocation of yolk hormones in sea turtles, multiple clutching oviparous reptiles with a high reproductive output and temperature …
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The role of incubation temperature in determining avian phenotype: implications for avian ecology, life history evolution, and conservation
… performance, and immunocompetence in hatchling wood ducks. In all experiments freshly laid wood duck eggs were collected from nest boxes located in SC, transported to Virginia Tech and incubated at one of three temperatures (35.0, 35.9, 37.0Ë C) that fell within the range of …
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Reproductive Parameters of Nesting <em>Caretta caretta</em> on Georgia's Barrier Islands
… using Hobo ® temperature data loggers and hatchling gonadal histology. Data was also collected to assess possible effects of nest relocation, hatchling size, and nest hatching success in Georgia. Results of this study did not reveal a discemable difference in incubation temperatures and …
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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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Salamander Mating Behaviors and Their Consequences for Individuals and Populations
… clutches based on microsatellite data from 32 hatchlings per clutch. Females mated with as many as three different males as indicated by conservative techniques. Less than half of females mated with multiple males. Based on comparative analyses, I recommend the parental reconstruction approach …
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Hormonal regulation and environmental influences in the reproduction of the butterfly Bicyclus anynana
… consequences of temperature variation on egg and hatchling composition, and the associated use and turnover of energy and egg compounds in relation to temperature. Overall, larger eggs produced at the lower temperature were achieved by providing these eggs with larger quantities of all compounds …
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The Ontogeny of Escape Responses and Locomotor Performance in Sceloporus Woodi
… are likely to be substantial. Juvenile and hatchling animals typically have a lower absolute velocity than adults. If escape velocity is a key variable in survival, then juveniles may be forced to tolerate shorter flight initiation distances than adults. As a result, they may switch …
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Population and habitat ecology of the river cooter (Pseudemys concinna) in the New River Gorge National River, W.V.
… study sites respectively, were juveniles. Most hatchling cooters apparently overwintered in the nest and emerged in April. Juvenile growth was rapid and linear until 6 years of age. Adult female cooters were larger (P=0.03) and heavier (P=0.0004) than males. Adult cooters consumed mostly …
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