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 17 of 17 for “"bluegill sunfish"”.
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Effects of exogenous androgens on parental care behaviour in male bluegill sunfish (Lepomis macrochirus)
… trade-off by manipulating androgen levels in bluegill sunfish (Lepomis macrochirus), a species where males provide sole parental care. I implanted males with testosterone, 11-ketotestosterone or flutamide, an androgen receptor blocker, and tested their nurturing behaviour and aggressiveness …
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Comparison of biomonitoring techniques for evaluating effects of jet fuel on bluegill sunfish (Lepomis macrochirus)
… behavior, and blood enzymes and ions of the bluegill sunfish (Lepomis rnacrochirus) to determine possible interrelationships and which procedures might be most descriptive of sublethal stress. The dynamic 96-h LCSO for WSF JP-4 was 26.2% (percent of the maximum soluble amount of JP-4). A …
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Fish fins and fast-starts: Multi-level analyses reveal functional variation within median fins of bluegill sunfish.
… fin-rays within the dorsal and anal fins of the bluegill sunfish, Lepomis macrochirus. Examining several musculoskeletal features of individual fin-rays within the dorsal and anal fins of bluegill, variation in (1) spine and ray lengths, (2) the proportion of the rays that were segmented or …
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Field and laboratory studies suggest that recruitment of the invasive common carp is controlled by native fish in Stable Lakes of the Upper Mississippi Basin.
… represented lake temperatures. We found that the bluegill sunfish was the main predator of carp eggs (94% of egg predators were bluegill sunfish), and that egg abundance declined before the estimated date of hatching in areas where bluegill sunfish were present. In our second experiment, carp egg …
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Effects of the Exotic Cladoceran Daphnia Lumholtzi (Sars) on the Growth Rate and Prey Selection of Bluegill Sunfish (Lepomis Macrochirus Rafinesque)
… lumholtzi interferes with the feeding of larval bluegill, which may stunt their growth. However, D. lumholtzi may enhance growth in larger bluegill, since D. lumholtzi are most abundant during midsummer, a period when native large-bodied Daphnia are typically rare in the plankton. The purpose of …
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Role of Parental Care and Ontogenetic Diets Shifts in the Recruitment Variation of an Aquatic Predator
… in environments that differed in the presence of bluegill sunfish Lepomis macrochirus , an important brood predator. Overall, the majority of fall recruits originated from the broods of larger, older males that spawned earliest and had higher mating success than other males. The presence of …
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A test of the effects of androgens on immunity: no relationship between 11-keto testosterone and immune performance in bluegill sunfish (Lepomis macrochirus)
… handicap hypothesis (ICHH). My thesis uses bluegill sunfish (Lepomis macrochirus) to test two predictions arising from this hypothesis: (1) natural concentrations of the androgen 11-keto testosterone (11-KT) will be negatively related with immunity, and (2) an immunochallenge will lower …
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Population crash of an endemic South African cyprinid: the role of non-native fish, drought and other environmental factors
… smallmouth bass Micropterus dolomieu and bluegill sunfish Lepomis macrochirus), temperature, precipitation, habitat characteristics and a range of physicochemical factors. The results show that sandfish have experienced a 93% decline in the sampled stretch of the Oorlogskloof River since …
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Effects of Nutrients and Top Predators on the Structure and Dynamics of a Freshwater Plankton Community: Experimental Studies
… community. Dynamite Lake contains high levels of bluegill sunfish and low nutrient levels. In both years nutrient and fish levels were manipulated in replicated, factorial-design experiments.
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Daphnia Diel Vertical Migration and Chemical Cues from Fish Predators
… different fish species—Lepomis macrochirus (bluegill sunfish), Lepisosteus osseus (longnose gar), and Pimephales promelas (fathead minnow). Light had a significant effect on lowering Daphnia position in the last set of trials and limited data suggest this light effect was limited to columns …
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The toxicity of ozonated secondary-treated municipal waste effluent to blue-gill sunfish
… secondary-treated municipal waste effluent to bluegill sunfish was investigated in a continuous-flow bioassay system. Four bioassay experiments were conducted, one with untreated secondary effluent and three with ozonated, secondary effluent. Ozone was applied at dosages between 12.1 and 52.0 …
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Predators alter host-parasite interactions via trait-mediated indirect effects
… dominant predators of the zooplankter Daphnia, Bluegill sunfish (Lepomis macrochirus) and larvae of the phantom midge fly Chaoborus punctipennis, to observe how predator presence altered Daphnia traits. These trait changes were predicted to influence the interaction between Daphnia and …
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Influence of physical habitat management strategies on sportfish and food-web processes
… survival of largemouth bass (M. salmoides) and bluegill (L. machrochirus), independent of habitat amount. Patterns of invertebrate community colonization and daily secondary production were similar between ponds containing Artificial or CWH structures. Moreover, the growth, condition, and …
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The effects of herbicide treatment on a reservoir ecosystem
… Weed removal also did not affect growth of bluegill sunfish (Lepomis macrochirus). Tissues of bluegills collected after treatment did not histologically appear to be affected by the herbicides. The Lc50 values for diquat and endothall separately and combined were determined for four species …
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Applying edge-core theory of intraspecific life-history variation to the control of invasive silver carp (hypophthalmichthys molitrix)
… relation to carbon dioxide and temperature using bluegill sunfish (Lepomis macrochirus) as a model. Bluegill were exposed to either increasing carbon dioxide or increasing temperature first in isolation, then as part of a group. Each bluegill also had their social personality quantified using a …
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Effects of environmental warming on lentic freshwater communities and the behavioral and physiological responses by fishes to warming
… and recreationally important fishes such as bluegill sunfish (Lepomis macrochirus) and largemouth bass (Micropterus salmoides). Previous experimental methodologies are often limited in spatial or temporal scale, in ecological relevance, and do not test climate change in replicated independent …
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Life History Observations and Determination of Potential Host Fish Species for Chipola Slabshell, Elliptio chipolaensis
… host species for Elliptio chipolaensis are the bluegill and redbreast sunfish. Sixty percent of the bluegill successfully transformed E. chipolaensis glochidia into juvenile mussels while 80% of the redbreast sunfish were successful.</p>