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Showing 1 to 20 of 34 for “"vertical stratification"”.
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Soybean Spiders: Species Composition, Population Densities and Vertical Stratification
Made available in DSpace on 2014-12-14T07:03:58Z (GMT). No. of bitstreams: 1 7726698.pdf: 2311519 bytes, checksum: 8a525d84fb0775b568f1f6cb0dc676ed (MD5) Previous issue date: 1977
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There’s more than one way to beat the heat: What anal probes reveal about thermal responses in Neotropical beetles (Coleoptera: Cerambycidae).
… maxima. Tropical microhabitats are linked to vertical stratification, because the canopy is hotter, winder, and less humid than the ground. In ectothermic organisms, such as beetles, thermoregulation is dependent on morphological and behavioral traits. This study investigates woodboring …
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A phytomer-based simulation model for growth in competitive weed-crop systems
… the dynamics of vegetative phenology and vertical distribution of leaf area in competitive weed-crop systems was developed. The model was based on (1) a temperature function for leaf appearance rate (2) a function for individual leaf expansion based on leaf appearance (3) a function for …
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Characterising the response of the mixed and the transitional layers to the passage of storms in the Sub-Antarctic Zone
… (SO) and have been shown to drive substantial vertical mixing, leaving behind wakes of perturbed upper ocean. The vertical extent and duration of the impact of these storms on the upper ocean remains unknown in this region, partly due to lack of observations in this remote part of the world. …
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Modeling Mesoscale Eddies: the Effects of Resolution onOcean Turbulence
… flow features, key mesoscale dynamics—including vertical stratification gradients and kinetic energy spectra—only converge at resolutions finer than 1/4°. Differences between the 1/8° and 1/16° simulations are small, suggesting that 1/8° resolution may be sufficient for resolving the mesoscale …
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Measures of stand structure and its relationship to site in the south-central Ridge and Valley Province of Virginia
… were measured by height strata to determine vertical stratification patterns. Foliage density was used in subordinate strata (< 5.0 m) as a comparative measure of vegetative structure. The results indicate that the contribution of shrubs to vegetation structure is much higher on xeric than …
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Supernova-driven turbulence and magnetic field amplification in disk galaxies
… that this is not the case. Accounting for vertical stratification and galactic differential rotation, we find an exponential amplification of the mean field on timescales of 100Myr. The self-consistent numerical verification of such a “fast dynamo” is highly beneficial in explaining the …
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Vertical Resource Partitioning and Sexuality of Three Sympatric Species of Red Sea Sandfishes (Xyrichtys melanopus, Labridae; Trichonotus nikii, Trichonotidae; Gorgasia sp., Congridae)
… to examine interactions that could result in the vertical stratification of the species over the sandy bottom within the fringing and patch reefs in the north Red Sea. Horizontal plankton tows were taken at three heights and three times a day. These samples were compared to stomach contents of the …
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THE IMPACT OF MICROCLIMATE ON BRANCH COLONIZATION BY NEOTROPICAL CERAMBYCID BEETLES
"Vertical stratification contributes to the great diversity of insects found in tropical rainforests. Due to differences in both biotic and abiotic factors, different strata of the forest provide different habitats for insects. A previous study in French Guiana revealed that wood-boring cerambycid …
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Equilibration of an atmosphere by geostrophic turbulence
… scaling relations for both the baroclinicity and vertical stratification of the equilibrated state.
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Tidal and Subtidal Lateral Structures of Density and Velocity in the Chesapeake Bay Entrance
… amplitudes, which suggested a higher vertically integrated mixing energy in North Channel. Tidal velocity convergences were more intense for springs than for neaps, and also for low than high buoyancy input conditions. In terms of subtidal properties, the vertical stratification showed …
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Sampling spatial sediment variation in gravel-bed streams
… the material found in gravel-bed rivers exhibits vertical stratification as well as spatial variation in the horizontal direction and is difficult to sample. Previous research has largely dealt with the ability of grid, areal, and bulk sampling techniques to sample a single spot within a river. …
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Wind-driven circulation on a shallow, stratified shelf
… was found that the feedback between mixing and stratification played a role in determining the strength of the circulation on the inner shelf, which differed between upwelling and downwelling. During upwelling, dense water is brought onto the inner shelf from below the pycnocline, producing …
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Sedimentation and Consolidation of cohesive and non-cohesive soils formed under turbulent flows
… parameters were determined using a well-known vertical settling column consolidation test setup. However, limited research studies are available for deposition and consolidation of a mixture of sediment (clay, silt and sand) under flow conditions which are more representative of what happens in …
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Adhesive areal sampling of gravel bed streams
… that makes up its channel bed. Usually, a vertical stratification by particle size can be recognized. The presence a coarser surface layer is considered to be one of the most important features of a gravel bed stream. Since this surface layer consists of a distinct population of material, …
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Two Problems in Computational Wave Dynamics: Klemp-Wilhelmson Splitting at Large Scales and Wave-Wave Instabilities in Rotating Mountain Waves
… and Klemp (SK92) in which the buoyancy and vertical stratification terms are treated as fast-mode terms. The large-scale cases of interest are the problem of Rossby wave propagation on a resting background state and the classic baroclinic Eady problem. The results show that the original KW78 …
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Foraging habitat niche comparisons and foraging behavior of seven species of flycatchers in southwest Virginia
… partitioning within habitats. Most notably, vertical stratification effectively separated most forest species. The use of different foraging substrates and different foraging tactics (sortie flight distance and methods of insect capture) were also important means of partitioning the food …
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The Accuracy of River Bed Sediment Samples
… Gravel bed streams are typically stratified vertically, in terms of particle size, in three layers, with each layer having its own distinct grain size distribution. The top two layers of the stream bed, the pavement and subpavement, are the most significant in determining the characteristics …
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Spatial and temporal patterns exhibited by select physicochemical and biological water quality parameters in Lake Texoma, Oklahoma and Texas.
… were observed to occur in conjunction with vertical stratification of the water column. Stratification stability at individual stations was attributable to both thermal and salinity density gradients throughout the period of stratification with the degree to which stratification is thermally …
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Interaction between the coastal ocean and the estuarine systems
… front from returning to the coast. The weakened vertical stratification in the plume during down-welling winds allows vertical mixing, so the weak cross-shore flow in the plume stops the front from returning to the coast.</p><p>The second chapter examines the transient response of the interaction …
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