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Showing 1 to 20 of 171 for “"diel"”.
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Daphnia Diel Vertical Migration and Chemical Cues from Fish Predators
… D. retrocurva showed a more pronounced diel vertical migration (DVM) at the downlake, lacustrine site (amplitude ≥8m) than the uplake, riverine site. D. pulicaria showed similar, though lower amplitude behavior. Daphnia diel migration may be controlled in part by exposure to fish …
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Phytoplankton growth and diel variations in beam attenuation through individual cell analysis
A number of investigators have observed diel variations in the bulk water inherent optical property beam attenuation, with a minimum near dawn and a maximum near dusk, and have assumed them to be caused by the phytoplankton. In an attempt to understand these patterns, mean forward light scatter of …
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The effects of diel vertical migration of Daphnia on zooplankton-phytoplankton interactions
Zooplankton populations which perform diel vertical migration (DVM) only spend the night in surface water layers but migrate downwards into the lower water layers during the day. The intention of this study was to investigate effects of DVM of Daphnia on phytoplankton dynamics and Daphnia life …
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Diel and seasonal dynamics of Anaulus australis at Muizenberg Beach, South Africa
… Beach in False Bay on the south-west coast. The diel cycle of A. australis was studied through hourly samples over 13 hours, by analysing water column and sediment samples at three stations. Phytoplankton cell and chlorophylla concentrations, along with nutrient levels, were assessed. Forecast …
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Phytoplankton growth and diel variations in beam attenuation through individual cell analysis
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1995.
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Diel vertical migration and frontal variability of acoustic backscatter in the Balearic Sea
… the abundance of zooplankton and characterize diel vertical migration (DVM). DVM is the mass vertical movement of zooplankton and fish between the surface waters where they feed at night, and the mesopelagic zone where they avoid predators during the day; it is considered the largest migration …
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Diel vertical migration and frontal variability of acoustic backscatter in the Balearic Sea
… the abundance of zooplankton and characterize diel vertical migration (DVM). DVM is the mass vertical movement of zooplankton and fish between the surface waters where they feed at night, and the mesopelagic zone where they avoid predators during the day; it is considered the largest migration …
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Growth, photophysiology and photosynthesis of two marine diatoms grown under predictable intra-diel light fluctuations
… amplitude light fluctuations also decreased intradiel variability in photoacclimation. This response was greater in P. tricornutum and was responsible for this species ability to maintain a consistent daily ETR between SI and LF regimes. This is thought to give P. tricornutum a competitive …
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Understanding the diel activity patterns and determinants of abundance of the eastern whip-poor-will
Made available in DSpace on 2022-01-12T21:45:29Z (GMT). No. of bitstreams: 2 SOUZA-COLE-THESIS-2021.pdf: 1817522 bytes, checksum: 7750bd89e488f50864a46a348287fda1 (MD5) LICENSE.txt: 4211 bytes, checksum: 2aa065f767c6132c154f17aa7c3bf85f (MD5) Previous issue date: 2021-07-08
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Effect of population density on diel activity and growth in stream-dwelling Arctic charr Salvelinus alpinus
… However, the way individuals may modify their diel activity in response to increased competition has received limited attention. I used juvenile (age 1+) Arctic charr Salvelinus alpinus as a model species to test the prediction that individuals at high population density will increase their …
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Investigating Diel Periodicity in Export Flux in the Gulf of Mexico Using a Particulate Imaging System
… was concluded to be the most likely cause of diel periodicity within the particulate flux, as relative currents around the camera were not shown to correlate with particle count</p>
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Diel and horizontal patterns in the densities of Bythotrephes, Chaoborus, and Leptodora in a Minnesota Reservoir
… during the day and the same night to target diel movement and nearshore to offshore population density differences across seasons. Night population densities increased on average by 364% (Bythotrephes), 129% (Chaoborus), and 493% (Leptodora) compared to daytime densities. Increases were …
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Seasonal and Diel Patterns of Abundance and Productivity of Phototrophic Picoplankton in the Lower Chesapeake Bay
… the summer season.</p> <p>Two high frequency diel studies measuring phototrophic picoplankton abundance and productivity in summer and winter seasons revealed physical factors in the water column partly determining phototrophic picoplankton distribution. Higher phototrophic picoplankton …
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Seasonal and diel periodicity of Cerambycid beetles in east-central Illinois: the potential for cross attraction
There appears to be considerable parsimony within the cerambycid beetle subfamily Cerambycinae in relation to pheromone biosynthesis and use. Aggregation pheromones, produced by the males, usually conform to a structural motif of a six-carbon chain with hydroxyl or carbonyl groups at C2 and C3, and …
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Diel patterns of insect herbivory and plant secondary metabolites in understory shrubs on Barro Colorado Island
… the timing of herbivory over the course of 56 diel cycles. I found that on young leaves, protecting plants from herbivores during the night causes significantly fewer leaves to be damaged than if plants are protected only during the day but are exposed at night. I then characterized qualitative …
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Characterizing Populations of Non-Coding RNAs in <i>Karenia brevis</i> at Different Times of the Diel Cycle
… expression between the two time points of the diel cycle.</p>
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The Effects of Vertical Diel Thermocline Movement on the Settling of Marine Snow in a River Influenced Marine Environment
<p>To evaluate the role of diel heating and cooling cycles in the upper water column in marine snow settling processes, particle distribution data from 15 marine snow camera casts were analyzed to examine variations in aggregate abundance, ellipsoidal volume, and particle elongation with depth. …
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Interactive effects of diel-cycling hypoxia, pH, and temperature on growth of Fundulus heteroclitus, a common estuary-resident fish
… at three temperatures in several treatments of diel-cycling DO and pH. Diel-cycling pH (ranging either from 7.2-7.8 or 6.8-8.1) at 25°, 30° and 35°C did not significantly affect growth. However, wide ranging diel cycles in DO (1-11 mg O2 l-1 but not 3-9 mg O2 l-1) significantly reduced growth …
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An investigation of spatial-temporal diel changes in Loligo reynaudii catch rates in the commercial squid jig fishery of South Africa
… of South Africa, there is: (1) an effect of diel period on chokka CPUE; (2) seasonal variation in any effects of diel period on CPUE; and (3) spatial variation in any effects of diel period on CPUE between seasons and years. The data used were DFFE (South African Department of Forestry, …
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The suitability of the microalgal metabolism for the recovery of nutrients from wastewater: the implications of solids residence time and diel cycles
… implications of solids residence time (SRT) and diel cycles on microalgal metabolism influencing wastewater treatment. Experimental results showed that SRT dictated intracellular nitrogen to phosphorus ratio of microalgal biomass, while 24-hour (i.e., continuous) removal of N and P was achieved, …
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