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.
Results
Showing 1 to 20 of 53 for “"Aquatic Insects"”.
-
Aquatic insects versus fish: adaptations to fish predation
v češtině Tato bakalářská práce je rešerší dostupných zdrojů o adaptacích vodního hmyzu vůči rybí predaci během všech fází jejich vývoje. Vzhledem k tomu, že je vodní hmyz velká skupina často si nepodobných druhů, je vodní hmyz jako takový na úvod této práce představen, včetně prostředí, ve kterém …
-
Community ecology of aquatic insects in forested headwater streams in the southern Appalachians
Competing paradigms of community assembly emphasize different mechanisms for predicting patterns in biogeography. Niche assembly emphasizes the role of environmental gradients as filters that organize a metacommunity by locally selecting colonizers with similar functional traits, whereas dispersal …
-
Assessing the Effects of Chronic Neonicotinoid Insecticide Exposure on Aquatic Insects using Multiple Experimental Approaches
… of regulators to adequately protect sensitive insects particularly those with aquatic larval stages. Many Prairie wetlands are in regions of intensive agriculture and are directly at risk of neonicotinoid contamination and require special considerations to best protect these ecologically …
-
Effects of water temperature on life history traits of selected South African Aquatic insects: implications for the ecological reserve
Life-history studies have informed all areas of aquatic ecological research, whilst also providing information relevant for conservation and management of aquatic systems. Given the large research gap that has existed in this regard for Southern Hemisphere lotic systems, there has been an urgent …
-
Food Habits of Fish In A Multispecies Farm Pond
… 1970 and 1971 in Abbey Pond, South Dakota. Aquatic insects, zooplankton, mollusks, and fish were the most frequently consumed food items by the three species. Yellow perch led primarily on aquatic insects, zooplankton, and mollusks. Aquatic insects were dominant (by volume) in 40.0 and 61.5 …
-
Food Habits of Black Crappies, White Crappies, Yellow Perch and White Suckers in a Small Impoundment in Northeastern South Dakota
<p>Crustaceans, aquatic insects and fish were the most important food items found in stomach samples. Black crappies depended on zooplankton and aquatic insects as their major food source as they occurred in all samples and were major food items in 70 percent and 40 percent respectively. Insects, …
-
Differential Utilization of Allochthonous and Autochthonous Carbon By Aquatic Insects of Two Shrub-Steppe Desert Spring-Streams: A Stable Carbon Isotope Analysis and Critique of the Method
… of autochthonous and allochthonous carbon by aquatic insects of two cold desert spring-streams in the Columbia Basin of Washington State. The aquatic insects of Snively Springs, a heavily overgrown and densely shaded stream, has isotopic values close to that of stream aufwuchs (substrata …
-
Examining the Impacts of Valley Fills in Stream Ecosystems on Amphibian and Aquatic Insect Communities in Southeastern Kentucky
… and complex life cycles, stream salamanders and aquatic insects are important trophic links and serve a critical role in transferring energy. Despite this importance little research has examined their community structure simultaneously in aquatic ecosystems. The primary objective of this research …
-
The effects of a toxic metals spill on aquatic fauna in streams near Culpeper, Virginia
… tributary which also drains into Jonas Run. Aquatic insects and detritus were collected at all sampling sites. Crayfish and small fish were collected whenever possible. Various water quality parameters were measured at each site. Also, aquatic insect community structure and function, …
-
Food Habits of Young-of-the-Year Fishes in Abbey Pond, South Dakota
… and counted in the laboratory. Zooplankton, aquatic insects and fish were the most important food organisms consumed by young fishes. Using Ivlev’s electivity index food electivity by the fishes for zooplankton was calculated. The size-specific food habits of young-of-the-year largemouth bass …
-
REPRODUCTIVE CHARACTERISTICS OF AMERICAN COOTS (FULICA AMERICANA) IN NORTHERN ARIZONA.
… by a greater abundance and diversity of emerging aquatic insects. Clutches with more eggs, however, did not correspond to nest sites associated with more abundant aquatic insects. I suggest that clutch size might have been influenced by some aspect of nutrients stored prior to egg-laying which …
-
Biodiversity and Phenology of the Epibenthic Macroinvertebrate Fauna in a First Order Mississippi Stream
… and stick and leaf samples to collect the aquatic insects of Granny Creek, a first-order perennial stream in southern Mississippi, on twelve sampling dates from March 2014 to June 2015. The dominant insect/invertebrate group in Granny Creek was the dipteran family Chironomidae. Forty-two …
-
Food Habits of Walleye and Saugeye When Stocked as Secondary Predators into Small South Dakota Impoundments
… bass primarily consumed fishes, and few aquatic insects. Larger (200- 380 mm) largemouth bass primarily consumed fishes in Enemy Swim Lake, while larger bass in Byre Lake fed more extensively on crayfish and aquatic insects during spring and summer, and on fishes only during the fall. …
-
Food Habits, Growth, and Production of Young-of-the-Year Walleyes, Stizostedion vitreum vitreum (Mitchell), in a South Dakota Pond
… in 26.6% of the stomachs (69.2% by volume) and aquatic insects in 21.5% (17.6% by volume). Walleyes fed primarily on Diaptomus sp. until mid-July when they began feeding primarily on fathead minnows. Fathead minnow populations declined and in mid-August walleyes sought an alternate food source. …
-
The influences of hydrology and vegetation on emergent insect and benthic macroinvertebrate communities across space and time in seasonally inundated, geographically isolated wetlands
… However, they support a diverse community of aquatic macroinvertebrates, including insects that serve as energy in upland food webs when they emerge as adults. How aquatic macroinvertebrate communities, particularly emergent aquatic insects, respond to vegetation and differences in long-term …
-
Ecological and Trophic Distribution of Pesticides in Lack Poinsett, South Dakota
… sediment, zooplankton, benthic algae, crayfish, aquatic insects and fish. Concentrations of aldrin, DDD, DDE, DDT, dieldrin, endrin, heptachlor, heptachlor epoxide, lindane, methoxychlor, and toxaphene were determined by gas chromatography and thin-layer chromatography. DDT and its metabolites, …
-
The Effects of Odonates on a Littoral Prey Community
… cling to littoral vegetation and consume aquatic insects and microcrustaceans. To monitor the effects of these odonate predators on community dynamics, a 2X2 factorial in situ enclosure experiment was set up and monitored over an eight-week period. Twelve enclosures were placed in a …
Page 1 of 3