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 “"ontogenetic variation"”.
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Geographic and Ontogenetic Variation of Venom in the Rattlesnakes Crotalus oreganus oreganus and Crotalus o. helleri
<p>I investigated the extent of variation of venom protein composition (venome) and neurotoxicity in the Northern Pacific (Crotalus oreganus oreganus) and Southern Pacific (C. o. helleri) rattlesnakes, with special emphasis on geographic variation across the species’ California range. In the first …
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Taxonomia das espécies de Hyla pertencentes ao grupo de H. Rubicundula Reinhardt & Lutken, 1862 (Amphibia, Anura, Hylidae)
… were analyzed intra- and inter-populational variations. We have found a high degree of intra- and inter-species heteromorphism, which made difficult to establish limits among species. Part of these variation was associated to ontogenetic variation, and part was associated to individual and …
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A Glyptosaurine Lizard from the Eocene (late Uintan) of San Diego, California, and Implications for Glyptosaurine Evolution and Biogeography
… here also shows features consistent with ontogenetic variation and may help to provide insight into the life history of glyptosaurine lizards.</p>
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Determining the Trophic Role of Gulf Menhaden (<i>Brevoortia patronus</i>) Using Carbon and Nitrogen Stable Isotopes
… This study examines the spatial, temporal and ontogenetic dynamics of food selectivity and trophic role observed in Gulf menhaden. The most important dietary item for juvenile fish was found to be phytoplankton (75.7% dietary composition) while that of subadults and adults was found to be …
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Parasitism, Predation Prediction: Modelling Variations in Ecological Interactions from Mechanisms to Networks
… of communities. Intraspecific and environmental variations are often present in ecological interactions and are typically observable within the processes that regulate the existence and strength of these interactions as well as in the topology of ecological interaction networks. The main …
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A revision of helicoplacoids and other early Cambrian echinoderms of North America
… of helicoplacoid disparity accounted for by vii ontogenetic variation. These triradiate spindle-shaped echinoderms were capable of expansion and contraction by means of cloacal pumping, and attached to skeletal debris or semi-lithified matgrounds by means of a suction pad. Rather than …
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Microgeographic and ontogenetic variability in the ecology of invasive Brown Treesnakes on Guam, and effects of roads on their landscape-scale movements
To view the abstract, please see the full text of the document.
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Comparing the coarse- and high-resolution horizontal and vertical egg distribution patterns of three clupeiform species in the southern Benguela ecosystem
… collection reduced the survey coefficient of variation for sardine and round herring eggs but not for anchovy eggs. Horizontal egg distribution patterns for anchovy showed that high egg densities were centered at two specific regions: midshelf (east of Cape Point) and offshore in the southern …
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Interazioni trofiche tra Condroitti in Mediterraneo
… leioglossus are exploited by some species. Ontogenetic variation in feeding habits were noticed: in general small specimens eat small preys, especially benthic ones (crustaceans, small teleosts and sepiolids). With the growth preys bigger and more swimming prone become more important in the …
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The Design of Complex Weapons Systems in Scorpions: Sexual, Ontogenetic, and Interspecific Variation
<p>Scorpions possess two integrated multifunctional weapons systems. Anteriorly, they maintain a grasping system comprised of a pair of pedipalps ending in chelae that seize and manipulate prey, ward off predators, and secure mates. Posteriorly, they wield a venom delivery system consisting of a …