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 47 for “"feeding rate"”.
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The Effects of Landfill Leachate on the Behavior, Feeding Rate, and Growth Rate of the Freshwater Prosobranch Snail Elimia Potosiensis
… effects of landfill leachate on the behavior, feeding rate, and growth rate of the prosobranch snail Elimia potosiensis by comparing two sites, one non-contaminated (Site NC) and one contaminated (Site C). The copper concentration resulting in a decreased feeding rate was also established. An …
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The foraging behaviour of granivorous birds: a mechanistic perspective.
1. The functional response, i.e. the feeding rate as a function of prey density, links resource availability to population level demographic rates. The functional response is often central to behavioural-based population models that predict the effect of environmental changes on populations based …
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Scanning-group-size effect in flocks of house sparrows : quantifying the contribution of competition and anti-predatory vigilance
… levels of scanning decrease while time spent feeding increases. Traditionally, anti-predatory considerations provide the preeminent explanation for this scanning-group-size effect, but contest and scramble competition could also account for the results. The anti-predatory hypothesis predicts …
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Extrusion foaming of bioplastics for lightweight structure in food packaging
… of the pure PHBV, namely low crystallisation rate, tensile strength, ductility, melt viscosity, thermal stability and high materials cost. The physical, mechanical, thermal, and rheological properties of the pure PHBV were studied systematically first to lay a solid foundation for formulation …
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A study of direct powder rolling route for CP-titanium
… roll gap size, roll surface width and powder feeding rate on the integrity of the metal powder compacted strip that is produced from the direct powder rolling process. The objectives of this work were to predict the powder rolling compaction performance in terms of compaction pressure, roll …
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Studies of the synthesis, environmental occurrence and toxicity of unresolved complex mixtures (UCMs) of hydrocarbons
… caused a significant reduction in mussel ciliary feeding activity indicating that 4-PO was indeed toxic as measured by this bioassay. The demonstrable narcotic activity of 4-PO is presumably related to the greater aqueous solubility of branched hydrocarbons compared with similar straight chain …
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Biologia reprodutiva de Formicivora erythronotos (Aves: Thamnophilidae)
… take tums incubating the eggs, and brooding and feeding the young. Male's contribution is slightly greater in the latter three activities, and female alone takes charge of noctumal incubation and brooding. Each parent takes care exclusively of one fledgling. The average duration of incubation …
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Rainbow Trout (Salmo Gairdneri) Cage Culture and Primary Production In Eastern South Dakota Dugout Ponds
… of body weight daily, indicated that the optimum feeding rate was near 3% for this size range (35=100g). Daily rations based on fish size and water temperature need to be developed for trout reared in a lentic environment. The high cost of fingerlings was the limiting factor in a hypothetical …
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Rainbow Trout Cage Culture and Benthic Production in East-Central South Dakota Dugouts
… feasibility of raising annual fish crops. Growth rates were compared between feeding rate (0, 3, and 5% body weight/day [bwt/day]) and stocking rate (35, 52, and 70 fish/cage). Growth was significantly (P ≤0.05) greater at feeding rates of 3 and 5% bwt/day than 0% bwt/day. The fish fed 0% bwt/day …
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Process analytical technology in tablet manufacturing
… three critical process parameters; solid feeding rate, liquid feeding rate and extruder speed. EYECON and QICPIC were utilized for obtaining particle size distribution during experiments; consequently, one configuration which provided the best unimodular-shaped PSD was selected and full …
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Assessment and prediction of the potential threats of temperature change and invasive species to the sustainability of Northern Irish sea fisheries
… I found that red light reduced the maximum feeding rate of lionfish, compared to blue and white light, by dampening the attack rate. I assessed how temperature increase affects the proportional consumption of an amphipod prey by an intertidal predator, the bleniid, Lipophrys pholis …
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Unresolved complex mixtures of aromatic hydrocarbons in the marine environment : toxicity, solubility and photodegradation studies
… nominal aqueous concentration tested, mussel feeding rate was reduced by -40 % in the 24 hour exposure period, during which the mussels accumulated a body burden similar to the body burden of monoaromatic UCM hydrocarbons in wild mussel populations, previously shown to exhibit reduced SFG. …
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An Ecological Approach to Feed Management in Fish Rearing Ponds
… catfish rearing ponds using three different rates of feed addition (no feeding, 1%, or 3% body-weight/day, BW/d). Ponds in the 3% BW/d treatment had low dissolved oxygen (DO) concentrations and their surface became covered by filamentous green algae. Further, the feed did not enhance or …
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Are there self-imposed group foraging costs in the nutmeg mannikin (Lonchura punctulata)?
… of others without necessarily improving their feeding rates. Feeding rates may actually decrease in the presence of others due to different forms of competition and interference (kleptoparasitism, aggression). Recent work with starlings ( Sturnus vulgaris ) shows that social foragers may also …
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Experimental evidence that group foragers can converge on predicted producer-scrounger equilibria
… on two experiments. Payoffs were measured by feeding rate (seeds/s) in two feeding conditions. In all cases, payoffs to scroungers were found to be highly negatively frequency-dependent on the frequency of scrounging. All functions were linear (p $<$.05). In the second part of experiment 2, …
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The Development and Application of a Larval Pallid Sturgeon (Scaphirhynchus albus) Bioenergetics Model
… in the Missouri River (13 – 28°C). Exogenously feeding larval fish were fed chironomids at ad libitum rations three times daily over multiple days to determine maximum consumption and estimate growth. I used static respirometry to quantify the routine respiration rate of larval Pallid Sturgeon. …
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Corticosterone as a mediator of the tradeoff between survival and reproduction
… with both brooding behavior and offspring feeding rate, but experimental manipulation of corticosterone in the latter study had no effect. And finally, I evaluated the relationship between environment and endogenous corticosterone levels, finding no support for any relationship between the …
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Corticosterone as a mediator of the tradeoff between survival and reproduction
… with both brooding behavior and offspring feeding rate, but experimental manipulation of corticosterone in the latter study had no effect. And finally, I evaluated the relationship between environment and endogenous corticosterone levels, finding no support for any relationship between the …
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Evaluating non-point source microplastic pollution and its impact on biota in the Huron River
… and diclofenac for 24 days reduced mussel feeding rate in some treatments after 19-20 days but had no detectable effects on mussel growth and metabolism.</p>
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The effect of monochromatic light on the growth, food conversion, and survival of two strains of rainbow trout, Salmo gairdneri (Part I); Catfish farming as supplemental income in rural Virginia: use of catfish strains (Part II)
… days. Fish were fed trout chow twice daily at a rate previously found to maximize growth and efficiency. This feeding rate was determined by consulting hatchery records and the feeding charts developed by Haskell (1959). Mean length and mean weight of test animals may be affected by the rearing …
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