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 10 of 10 for “"nest size"”.
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Does nest size constrain clutch size? A tropical-temperate test
The smaller clutch size of tropical as opposed to north temperate birds has intrigued researchers for a long time. An untested hypothesis posits that higher nest predation in the tropics favors smaller nests thereby constraining clutch-size. We tested this hypothesis by conducting an experiment to …
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Does nest size constrain clutch size? A tropical-temperate test
The smaller clutch size of tropical as opposed to north temperate birds has intrigued researchers for a long time. An untested hypothesis posits that higher nest predation in the tropics favors smaller nests thereby constraining clutch-size. We tested this hypothesis by conducting an experiment to …
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Predatory and Mutualistic Interactions between Freshwater Minnows and their Predators
… American freshwater ecosystems is the pebble nest-building minnow, the bluehead chub (Nocomis leptocephalus; "chub"). Chubs provide spawning habitat for not only themselves, but for other minnows, collectively called "nest associates". In this work, I observe the predatory and potential …
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The Causes and Consequences of Complex Behavioral Trait Variation in a Resident Montane Bird
… conditions (e.g. poor parental care, low-quality nest environment, etc.), but whether these same patterns are exhibited in natural populations is relatively unstudied. This dissertation provides novel insights into the mechanisms shaping complex behavioral trait variation in wild systems focusing …
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Enhancing the weaver ant, <i>Oecophylla smaragdina</i> (Hymenoptera: Formicidae), for biological control of a shoot borer, <i>Hypsipyla robusta</i> (Lepidoptera: Pyralidae), in Malaysian mahogany plantations
… developed to estimate the number of ants within nests on <i>Khaya ivorensis</i> A. Chev. (Meliaceae): log₁₀ (Number of ants) = - 1.16 + 1.09 log₁₀ (Nest size). Nest size is calculated from estimated nest height <i>(ĥ)</i> and length <i>(à )</i> using the formula = π;r²⁺; <i>à </i>, where r = ½ …
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Dedicated dads: a study on the nesting behaviour of Spondyliosoma emarginatum (Telostei: Sparidae)
… This study used video monitoring to uncover the nesting behaviour of an endemic southern African species of the Sparidae family, Spondyliosoma emarginatum (steentjie). S. emarginatum has evolved a nesting strategy by which males create nests on the seafloor for females to lay their eggs in. The …
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Nest Morphogenesis and Population Ecology of Two Species of Formica
… pattern with three well defined but transitional nest forms: (1) Stage I, characterized by a thatched dome without excavation, (2) Stage IT, characterized by a raised, thatched dome, earthen embankment and an excavated pocket containing thatch, and (3) Stage III, characterized by a depressed dome …
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Impacts des changements climatiques passés et présents sur la génétique et la démographie du Cincle plongeur (Cinclus cinclus)
… consisted in analysing ringing recoveries and nest-boxes frequentation from a dippers population settled on the river Syre and its tributaries (Luxemburg) and followed from 1979 to 2001. Populations census were also conducted on different water courses in Luxemburg, in order to determine dipper …
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Multiple Paternity of Caretta Caretta within the Northwestern Atlantic Ocean Population on Wassaw Island, Ga
… the ecology, evolution, effective population size and genetic variability of a species. Polyandry, resulting in multiple paternity can influence the maintenance of genetic variation within a population. Within Testudines, the frequency of multiple paternity varies extensively among species …
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Cutter, carriers and bucket brigades ...
… behaviour and the determination of fragment size, (b) the effect of load size on transport economics, (c) division of labour and task-partitioning. Grass-cutting ants, Atta vollenweideri, harvest grass fragments that serve as substrate for the cultivation of a symbiotic fungus. Foragers were …