Filters: Tags: Spatial variation (X)7 results (159ms)
Spatial Variability in 14C Estimates of Phytoplankton Productivity in Kentucky Lake, an Impoundment of the Tennessee River, U.S.A
Spatial Variation in Î´15N and Î´13C Isotopes in the San Juan River, New Mexico and Utah: Implications for the Conservation of Native Fishes
Spatial patterns of resource use by small-bodied fishes in the San Juan River were examined using stable isotopes. Using Î´15N of fishes as an index of trophic position, our data suggest both native and non-native fishes primarily consumed macro-invertebrates. The Î´13C of these fishes further suggested a detritus-based food web, from which most species fed on chironomids in low-velocity habitats. A two-way ANOVA revealed a significant interaction between trophic level of fish species and longitudinal position in the river. This interaction was primarily attributed to a decline in trophic level of non-native red shiner Cyprinella lutrensis, relative to other species, in upstream reaches of the river. In addition,...
Use of Variable-scale Pressure Test Data to Estimate the Log Hydraulic Conductivity Covariance and Dispersivity of Fractured Granites near Oracle, Arizona