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 39 for “"invertebrate abundance"”.
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Avian and Aquatic Invertebrate Abundance on Three Agricultural Management Systems in Eastern South Dakota
… on wildlife by determining avian and aquatic invertebrate abundance on a conventional (CON), organic (ORG), and transitional no-till (TNT) farming system. Waterfowl pair abundance varied for individual species on all wetland classes in 1993 and 1994. Total waterfowl pair abundance was …
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Availabilty of Potential Invertebrate Foods for Anatini Ducklings Above and Below the Water Surface of Eastern South Dakota Wetlands
The availability of aquatic and aerial invertebrates as potential foods for Anatini (dabbler) ducklings was explored during the summers of 1998 and 1999 in eastern South Dakota. Two study areas, the Oakwood Lakes complex and Mickelson Memorial Wetland, were chosen for this research during the …
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Benthic Macroinvertebrate Susceptibility to Trout Farm Effluents
… effects of a Virginia trout farm on benthic macroinvertebrates were examined using multiple approaches. Static laboratory tests with the amphipod, Hyallela azteca, were conducted with exposures to water taken from a spring, effluent above a sedimentation basin, and effluent below a sedimentation …
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Chemical Treatment of Monodominant Cattail Stands In Semipermanent Wetlands: Duck, Invertebrate, and Vegetation Response
… breeding and overwater nesting ducks and aquatic invertebrates to the chemical treatments were studied in northeastern South Dakota. Four wetlands were treated with glyphosate in 1985 by fixed-wing aircraft and were compared to cattail-dominated wetlands and wetlands with a natural interspersion …
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Water quality and biotic community response to an urban – rural land-use gradient in the Lake Simcoe watershed
… periphyton nutrient content and biomass, and invertebrate response in lotic surface waters in the LSW. To infer the contribution of cosmetic fertilizer use in the LSW, a community survey was conducted to assess lawn care and fertilizer choices by residents. Overall, the survey results …
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Upland grassland agri-environment impacts on invertebrate biodiversity
Recent major declines in invertebrate abundance linked to agricultural intensification and land-use change have been documented. There has been a widespread lack of environmental monitoring and assessment of agri-environment schemes, with a lack of evidence supporting clear benefits of …
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The Role of Urban Climate and Land Cover in Phenology, Nest Success, and Habitat Use
… and phenology. Temperatures, leaf phenology, invertebrate abundance, nest habitat, and nest fate were monitored over a four-year study period at nine sites along an urban to rural gradient. The sites were located in a riparian corridor passing through the cities of Reno and Sparks, Nevada. …
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Nesting and Brood-Rearing Success and Resource Selection of Greater Sage-Grouse in Northwestern South Dakota
… vegetation at these sites may provide increased invertebrate abundance, which is necessary in the diets of sage-grouse chicks. Management of sage-grouse nesting habitat on the eastern edge of their range should focus on increasing levels of sagebrush density and canopy cover while maintaining …
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Nutritional Value and Management of Waterfowl and Shorebird Foods in Atlantic Coastal Moist-Soil Impoundments
… using nutritional data as a basis for evaluation.Invertebrate and plant seed production were measured in disced and control plots in impoundments at Back Bay National Wildlife Refuge. Seed production was higher (P = 0.0614) in disced (1052 ± 468 kg / ha) than in control (529 ± 226 kg / ha) plots. …
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Occupancy and Detection Rates of Salamanders in Association with Altered Water Regimes at Mingo National Wildlife Refuge in Southeastern Missouri
… 2012. I also collected data on the diversity and abundance of reptiles, fish, and invertebrates at each site. I then generated models that would estimate site occupancy and detection rates for three common salamander species. For both Siren and Notophthalmus, occupancy and detection rates were …
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Macroinvertebrate Composition and Patterns of Prey Use By Juvenile Pallid Sturgeon (Scaphirhynchus albus) in the Missouri River, South Dakota, and Nebraska
Macroinvertebrates were collected from the Missouri River downstream of Fort Randall and Gavins Point dams to evaluate spatial and temporal patterns in abundance and describe habitats important for macroinvertebrates. The most abundant families collected were Chironomidae, Ceratopogonidae, …
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The Effects of Simulated <i> Spermophilus Franklinii </i> Burrowing on Prairie Soil Invertebrate Communities
… have ecological effects on overlying vegetation, invertebrate communities, and surrounding soil characteristics. Franklin’s ground squirrel (<em>Spermophilus franklinii</em>) is a declining, tunneling mammal species previously found throughout Central Illinois. Preference for natural tallgrass …
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Controls over the distribution of soil micro-invertebrates in the McMurdo Dry Valleys, Antarctica
… are a cold desert ecosystem where soil micro-invertebrate communities are shaped by extreme abiotic conditions, particularly low soil moisture, organic carbon availability, and high salinity. In this thesis I combine long-term ecological data with spatial habitat modeling to investigate the …
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Temporal Patterns of Aquatic Macroinvertebrate Communities and Organic Matter Standing Stock Availability in a Coastal Floodplain (Altamaha River, Georgia)
… This study aims to investigate how aquatic macroinvertebrate communities changed over the course of the annual flood pulse. I predicted that the communities would be different and that the differences would be driven by hydrology at the main stem and organic matter standing stock availability. I …
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Body Size And Habitat Shading Influence The Consumptive And Non-Consumptive Effects Of Wood Frog (lithobates Sylvaticus) Tadpoles On Aquatic Invertebrate Communities
… and non-consumptive interactions on aquatic invertebrates largely unexplored. The objectives of this study were to quantify omnivory among wood frog (Lithobates sylvaticus) tadpoles, determine their consumptive and non-consumptive effects on invertebrate communities, and investigate whether …
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Investigating the physical and ecological drivers of change in a coastal ecosystem: from individual to population scale impacts.
… and ecological factors that determine benthic invertebrate abundance, distribution and community structure, which is examined at the scale of the whole harbour, and at the scale of individual habitats: an intertidal mudflat and a saline lagoon; and 2) predicting the response of an overwintering …
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Animal-habitat relationships in the Knysna forest : discrimination between forest types by birds and invertebrates
… species composition and physiognomy on bird and invertebrate communities in three discrete, relatively undisturbed forest types along a dry-wet soil moisture gradient. Using discriminant functions analysis, a 100% floristic and a 78% vegetation structural discrimination was obtained between the …
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The Effects of Climate Change and Long-term Fire Suppression on Ephemeral Pond Communities in the Southeastern United States
… important habitat for amphibians and aquatic invertebrates, but extensive deforestation has destroyed or isolated many wetlands and fire suppression has altered vegetation in others. My goals were to identify how wetland hydroperiods have changed through time and to examine the effects of …
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Evaluating Marsh Restoration Success Using Structural and Trophic Metrics on Deer Island, MS
… and minnow trap sampling were used to compare invertebrate and nekton abundance, species richness, and diversity of two restored marshes (5+ yrs and 15+ yrs) with a natural reference marsh (100+ yrs old). Stable isotope analysis was also used to compare basal carbon sources and trophic support …
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Biotic Responses on Typha-monodominant Semipermanent Wetlands To Cattle Grazing
… 1985. Passerine birds, waterfowl, and aquatic invertebrates were sampled during the week corresponding to the vegetative sampling. The grazing treatment was sufficient to alter the biotic state of emergent march compared to the un-grazed plots. Live and dead cattail stems decreased, residual …
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