The purpose of this study was to determine the distribution of native fish in the Kakanui River, their importance, and to assess low flows for maintenance of native fish habitat. The mainstem of the river was electrofished at 13 locations from near the estuary to the headwaters 54 km upstream. Eleven native fish species were found. Eight of these were reasonably abundant and their requirements ...

Export coefficient models (ECMs) are often used to predict nutrient sources and sinks in watersheds because ECMs can flexibly incorporate processes and have minimal data requirements. However, ECMs do not quantify uncertainties in model structure, parameters, or predictions; nor do they account for spatial and temporal variability in land characteristics, weather, and management practices. We a...

1. Comparative research and generalisations in lotic ecology are challenged by the dynamic hydrology of fluvial systems. The aim of this study was to understand more fully how factors such as light, nutrients and flow can predict variation in autochthonous production and algal biomass. 2. We measured seasonal changes in percent bankfull discharge, inorganic nutrient concentrations, turbidity, i...

Currently, there is little understanding of the controls that instream thermal limits and hydraulic biotype diversity have on macroinvertebrate assemblages, particularly in association with changing altitude within given southern African mountain drainage systems. Thus, the aim of this research was to examine aquatic macroinvertebrate assemblage changes in response to spatial and temporal geo-h...

Riparian zones form the interface between stream and terrestrial ecosystems play a key role through their vegetation structure in determining biodiversity, ecosystem functioning regulating human impacts, such as warming, nutrient enrichment sedimentation. We assessed how differing riparian types influence structural functional composition (based on species traits) of invertebrate communities ag...

SPAtially Referenced Regressions On Watershed attributes (SPARROW) models were used to relate instream nutrient loads to sources and factors influencing the transport of nutrients in the Missouri River Basin. Agricultural inputs from fertilizer and manure were the largest nutrient sources throughout a large part of the basin, although atmospheric and urban inputs were important sources in some ...

this article aims at designing the mathematical model for aras dam reservoir in time operation with missions of agriculture needs safeguarding, water electric energy production and torrent controls. reservoir system relations determinate and these relations at framework of are determined and stochastic dynamic programming are calculated executive results of this model are presentation of guides...

In knowledge-based organizations, workers need task-relevant knowledge and documents to support their task performance. A knowledge flow (KF) represents the flow of an individual’s or group members’ knowledge-needs and the referencing sequence of documents in the performance of tasks. Through knowledge flows, organizations can provide task-relevant knowledge to workers to fulfill their knowledg...

A new multibranch Integrated Catchment (INCA) model INCA-Metals has been developed to simulate the impact of tannery discharges on river systems. The accounts for key chemical reaction kinetic processes operating as well sedimentation, resuspension, dilution, mixing and redistribution pollutants in rivers downstream discharge points mine or acid rock drainage sites. is dynamic simulates daily b...