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 211 for “"neotropical"”.
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Evolutionary Assembly of the Neotropical Montane Avifauna
… hypothesized to shape diversification of Neotropical cloud forest birds. In the second chapter, I conducted comparative analyses using species-specific ecological traits, and 3,175 mtDNA sequences collected across the range of 45 co-distributed birds. First, I found that niche breadth, …
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Modeling Neotropical Ecosystems during the Last Glacial Maximum
… significance has long motivated research on Neotropical ecosystems, though regionally-focused modeling studies remain relatively sparse and limited in scope. Three individual projects were performed to address potential issues in the modeling of Neotropical ecosystems in past and present …
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Restoration genetics of Murray Mallee and neotropical forests.
Fragmented tree populations are not expected to be as susceptible to small population paradigm effects (e.g. genetic drift) that generally dominate conservation genetics and restoration as many other taxa. The reasons for this are that trees tend to (1) undergo regular far-reaching gene flow, even …
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Large-scale habitat relationships of neotropical migratory birds
I examined the relationship of bird assemblages and species to habitat patterns over landscapes composed of a mosaic of habitat elements. I surveyed songbirds using a variation of the variable circular plot method during the 1994 and 1995 breeding seasons on 20 sites ranging in size from 50 to 72 …
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Predicting biodiversity loss in insular neotropical forest habitat patches
Neotropical forests have experienced high rates of biodiversity loss as a result of burgeoning land-use changes. Habitat conversion into cropland, pastures, and more recently hydroelectric lakes, are leading drivers of forest loss and fragmentation of pristine forests in the world’s most biodiverse …
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Wood trait preferences of Neotropical xylophagous beetles (Coleoptera: Cerambycidae)
<p>Tree life history strategies are correlated with functional plant traits, such as wood density (WD), moisture content (MC), bark thickness (BT), and nitrogen content (N); these traits affect the nutrients available to xylophagous insects. Cerambycid beetles feed on substrates that vary in these …
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SPATIAL VARIABILITY IN SPECIES COMPOSITION IN NEOTROPICAL MONTANE TREE COMMUNITIES
A plot network was used to look at changes in stand–level characteristics, diversity, and floristic composition across the elevational gradient and at tree line. Thirty –six 0.1–ha tree plots were installed (1) along three different elevational transects in tropical montane cloud …
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Newly discovered fossils provide novel insights on Cenozoic neotropical snakes
Las serpientes son un grupo de reptiles escamados con una enorme diversidad en el Neotrópico. Sin embargo, el registro fósil de estos vertebrados es escaso en el norte de Sur América. Aquí describo algunos fósiles de serpientes de tres diferentes localidades de Colombia. Primero, del Mioceno del …
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A revision of the neotropical genus Erilophodes Warren (Lepidoptera, Geometridae)
The Geometrid moth genus Erilophodes Warren was redefined, using morphological characters of the wings, abdomen, hind tibiae and genitalia. Two new species, E. Spinosa and E. toddi, were described on the basis of male characteristics. Females of these species are indistinguishable from each other …
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Spatial and non-spatial patterns of genetic diversity in Neotropical bats
… diversity (Adjusted R²= 0.202) across the Neotropical region. However, the available bat mitochondrial DNA mined from public databases highlights many largely unsampled areas in the Neotropical region, which may be creating error and bias in overall results of this study. This study …
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THE IMPACT OF MICROCLIMATE ON BRANCH COLONIZATION BY NEOTROPICAL CERAMBYCID BEETLES
"Vertical stratification contributes to the great diversity of insects found in tropical rainforests. Due to differences in both biotic and abiotic factors, different strata of the forest provide different habitats for insects. A previous study in French Guiana revealed that wood-boring cerambycid …
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Frugivory and North American Migrants in a Neotropical Second-Growth Woodland
Bird species visitation to a single fruit source fluctuates over time due to changes in fruit density, presence of behaviorally dominant birds, and availability of alternative fruit sources. As a result, different bird species are major consumers of a fruit source at various periods of the fruiting …
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Natal dispersal and first-year survival in a neotropical migratory songbird
Juvenile survival is among the most important demographic parameters driving population dynamics in birds. However, because first-year (i.e. 1-year-old) migratory passerines are thought to return to breed at great distances from their natal location, the factors that influence first-year survival …
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The effect of urbanization on the stopover ecology of neotropical migrant songbirds
I conducted spring migration point counts and vegetation surveys at 29 forest patches in the Chicago, IL metropolitan area in 2012 and 2013. The forest patch selection was designed to test the effects of patch size, distance from the Lake Michigan shoreline and degree of urbanization. I conducted …
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Barcoding and eDNA metabarcoding of a rapidly changing Neotropical freshwater fish community
The Neotropical region comprises one of the greatest freshwater fish diversities in the world. Conservation and management actions in freshwater realms face great challenges in this region due to an insufficient knowledge base (e.g. shortage of taxonomic expertise, lack of robust, routine, …
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Non-invasive monitoring for population assessments of a critically endangered Neotropical primate
… the applicability of the method for Neotropical primate surveys and conservation. Noninvasive genetic sampling allowed for a complementary population assessment in northern muriqui and provided information regarding the genetic diversity of the species in comparison to neighbouring …
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Assessing conservation status of remnant mammal populations in a Neotropical cloud forest
Neotropical cloud forests are some of the most biodiverse and yet threatened ecosystems. Terrestrial mammals play key roles delivering numerous ecosystem services within such systems including seed dispersal and nutrient cycling. Yet like the habitat in which they reside, some mammal species are …
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