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Articles 1 - 4 of 4
Full-Text Articles in Life Sciences
Habitat Characteristics Affecting Site Occupation In Wintering Henslow’S Sparrows At Mississippi Sandhill Crane National Wildlife Refuge, Mary E. Nicholson
Habitat Characteristics Affecting Site Occupation In Wintering Henslow’S Sparrows At Mississippi Sandhill Crane National Wildlife Refuge, Mary E. Nicholson
University of New Orleans Theses and Dissertations
Henslow’s sparrow (Ammodramus henslowii) winters in recently burned sites in pine savannas of the Southeastern United States. Previous studies have suggested that factors such as seed abundance and litter depth are important to wintering Henslow’s sparrows. My study asked how habitat variables including vegetation structure, seed abundance, and arthropod abundance predict Henslow’s sparrow site occupancy at Mississippi Sandhill Crane National Wildlife Refuge. In this study, Henslow’s sparrow more often occupied sites burned one growing season earlier than sites burned two growing seasons earlier, and did not occupy sites burned three or more growing seasons earlier. Data indicated that mass …
Ecology Of Ticks (Acari: Ixodidae) In Shelterbelts Of Southeastern Nebraska, Matthew W. Yans
Ecology Of Ticks (Acari: Ixodidae) In Shelterbelts Of Southeastern Nebraska, Matthew W. Yans
Department of Entomology: Dissertations, Theses, and Student Research
Shelterbelts in the agricultural landscape provide valuable habitat to a variety of animals that in turn may be hosts to ixodid ticks. The purpose of this study is to determine if shelterbelt associated factors influence tick ecology. In 2010 and 2011, ticks were collected from several shelterbelts in southeast Nebraska in Lancaster and Saunders counties. Four tick species were identified.
Adjacent land use, shelterbelt composition, and time of day were all factors which did not influence the number of questing ticks collected. Differences in relation to aspect and distance from the shelterbelt were significant. The east side had continually higher …
Carbon And Nitrogen Stable Isotopes In Fruits And Arthropods That Are Eaten By Songbirds During Migration, Sarah E. Donlan
Carbon And Nitrogen Stable Isotopes In Fruits And Arthropods That Are Eaten By Songbirds During Migration, Sarah E. Donlan
Senior Honors Projects
The use of stable isotope analysis is becoming more common in all areas of animal ecology. In particular, natural variation in the abundance of stable isotopes makes them useful in studies of foraging ecology. For example, nitrogen stable isotopes can offer insight into trophic relationships and carbon stable isotopes tend to trace the original source of carbon in a system (e.g. - photosynthetic pathway). This natural variation is potentially useful for quantifying resource use because the isotopic composition of an animal’s diet is assimilated somewhat predictably into the animal’s tissues. In fact, the ratio of naturally-occurring isotopes in animal tissues …
The Conservation And Ecology Of Carnivorous Plants, David Jennings
The Conservation And Ecology Of Carnivorous Plants, David Jennings
USF Tampa Graduate Theses and Dissertations
As discussed in Chapter 1, although our understanding of the ecology and evolution of carnivorous plants has greatly improved in recent years, many fundamental questions remain unanswered. Unfortunately, at the present time, many carnivorous plants are increasingly threatened by anthropogenic activities. Indeed, over half of the carnivorous plant species assessed by the International Union for the Conservation of Nature (IUCN) are listed as `threatened', but the threats to carnivorous plants have not previously been quantified. In Chapter 2, I quantified the conservation threats to carnivorous plant taxa worldwide by searching peer-reviewed literature, and found data on the threats to 48 …