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https://www.readbyqxmd.com/read/27920608/checklist-of-the-continental-fishes-of-the-state-of-chiapas-mexico-and-their-distribution
#1
Ernesto Velázquez-Veláquez, Jesús Manuel López-Vila, Adán Enrique Gómez-González, Emilio Ismael Romero-Berny, Jorge Luis Lievano-Trujillo, Wilfredo A Matamoros
An updated checklist of the distribution of fishes that inhabit the continental waters of the Mexican state of Chiapas is presented. The state was compartmentalized into 12 hydrological regions for the purpose of understanding the distribution of fish fauna across a state with large physiographic variance. The ichthyofauna of Chiapas is represented by 311 species distributed in two classes, 26 orders, 73 families, and 182 genera, including 12 exotic species. The families with the highest number of species were Cichlidae, Poeciliidae, Sciaenidae, Carangidae, Ariidae, Gobiidae, and Haemulidae...
2016: ZooKeys
https://www.readbyqxmd.com/read/27919559/effects-of-flow-regime-on-benthic-algae-and-macroinvertebrates-a-comparison-between-regulated-and-unregulated-rivers
#2
Susanne C Schneider, Zlatko Petrin
Natural fluctuations in flow are important for maintaining the ecological integrity of riverine ecosystems. However, the flow regime of many rivers has been modified. We assessed the impact of water chemistry, habitat and streamflow characteristics on macroinvertebrates and benthic algae, comparing 20 regulated with 20 unregulated sites. Flow regime, calculated from daily averaged discharge over the five years preceding sampling, was generally more stable at regulated sites, with higher relative discharges in winter, lower relative discharges in spring and smaller differences between upper and lower percentiles...
December 2, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27917353/application-of-the-mike21c-model-to-simulate-flow-in-the-lower-mekong-river-basin
#3
Truong An Dang, Tuan Hoang Tran
Numerical models are useful tools that play an important role in many research projects. Mike21C is one of the most well-established models for simulating a variety of processes, including bank erosion, bed level variations, aggradation, and degradation. Such processes are caused by a variety of activities, such as construction and dredging, as well as seasonal flow fluctuations. Mike21C based on an orthogonal curvilinear grid, which enables a computational speed that is faster than that of other grids. The hydrodynamic part of the model is based on solving the Saint-Venant equations...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27916949/comparing-%C3%A2-tmax-determination-approaches-for-granier-based-sapflow-estimations
#4
Inken Rabbel, Bernd Diekkrüger, Holm Voigt, Burkhard Neuwirth
Granier-type thermal dissipation probes are common instruments for quantifying tree water use in forest hydrological studies. Estimating sapflow using Granier-type sapflow sensors requires determining the maximum temperature gradient (∆Tmax) between the heated probe and the reference probe below. ∆Tmax represents a state of zero sap flux, which was originally assumed to occur each night leading to a ∆Tmax determination on a daily basis. However, researchers have proven that, under certain conditions, sapflow may continue throughout the night...
December 1, 2016: Sensors
https://www.readbyqxmd.com/read/27916810/is-the-geographic-range-of-mangrove-forests-in-the-conterminous-united-states-really-expanding
#5
Chandra Giri, Jordan Long
Changes in the distribution and abundance of mangrove species within and outside of their historic geographic range can have profound consequences in the provision of ecosystem goods and services they provide. Mangroves in the conterminous United States (CONUS) are believed to be expanding poleward (north) due to decreases in the frequency and severity of extreme cold events, while sea level rise is a factor often implicated in the landward expansion of mangroves locally. We used ~35 years of satellite imagery and in situ observations for CONUS and report that: (i) poleward expansion of mangrove forest is inconclusive, and may have stalled for now, and (ii) landward expansion is actively occurring within the historical northernmost limit...
November 28, 2016: Sensors
https://www.readbyqxmd.com/read/27912136/modeling-the-interannual-variability-of-microbial-quality-metrics-of-irrigation-water-in-a-pennsylvania-stream
#6
Eun-Mi Hong, Daniel Shelton, Yakov A Pachepsky, Won-Ho Nam, Cary Coppock, Richard Muirhead
Knowledge of the microbial quality of irrigation waters is extremely limited. For this reason, the US FDA has promulgated the Produce Rule, mandating the testing of irrigation water sources for many farms. The rule requires the collection and analysis of at least 20 water samples over two to four years to adequately evaluate the quality of water intended for produce irrigation. The objective of this work was to evaluate the effect of interannual weather variability on surface water microbial quality. We used the Soil and Water Assessment Tool model to simulate E...
November 29, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27910953/three-millennia-of-heavy-rainfalls-in-western-mediterranean-frequency-seasonality-and-atmospheric-drivers
#7
J P Corella, B L Valero-Garcés, S M Vicente-Serrano, A Brauer, G Benito
Documenting subdecadal-scale heavy rainfall (HR) variability over several millennia can rarely be accomplished due to the paucity of high resolution, homogeneous and continuous proxy records. Here, using a unique, seasonally resolved lake record from southern Europe, we quantify temporal changes in extreme HR events for the last 2,800 years in this region and their correlation with negative phases of the Mediterranean Oscillation (MO). Notably, scarce HR dominated by a persistent positive MO mode characterizes the so-called Migration period (CE 370-670)...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27909431/the-microbiota-of-recreational-freshwaters-and-the-implications-for-environmental-and-public-health
#8
Chang Soo Lee, Minseok Kim, Cheonghoon Lee, Zhongtang Yu, Jiyoung Lee
The microbial communities in recreational freshwaters play important roles in both environmental and public health perspectives. In this study, the bacterial community structure and its associations with freshwater environments were investigated by analyzing the summertime microbiomes of three beach waters in Ohio (East Fork, Delaware, and Madison lakes) together with environmental and microbial water quality parameters. From the swimming season of 2009, 21 water samples were collected from the three freshwater beaches...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27907178/characteristics-of-phytoplankton-biomass-primary-production-and-community-structure-in-the-modaomen-channel-pearl-river-estuary-with-special-reference-to-the-influence-of-saltwater-intrusion-during-neap-and-spring-tides
#9
Weihua Zhou, Jie Gao, Jianzu Liao, Ronggui Shi, Tao Li, Yajuan Guo, Aimin Long
In recent decades, increasing frequency and intensity of saltwater intrusion in the Modaomen Channel has threatened the freshwater supply in the surrounding cities of the Pearl River Estuary, and ulteriorly changed the environmental conditions of the estuarine waters. Phytoplankton biomass, primary production (PP) and species composition, as well as hydrological and chemical parameters were examined along a downstream transect in the Modaomen Channel during neap tide (NT) and spring tide (ST), when a strong saltwater intrusion event occurred in late September, 2011...
2016: PloS One
https://www.readbyqxmd.com/read/27903266/environmental-determinants-of-malaria-transmission-in-african-villages
#10
Noriko Endo, Elfatih A B Eltahir
BACKGROUND: Malaria transmission is complex, involving a range of hydroclimatological, biological, and environmental processes. The high degree of non-linearity in these processes makes it difficult to predict and intervene against malaria. This study seeks both to define a minimal number of malaria transmission determinants, and to provide a theoretical basis for sustainable environmental manipulation to prevent malaria transmission. METHODS: Using a field-tested mechanistic malaria model, HYDREMATS, a theoretical study was conducted under hypothetical conditions...
December 1, 2016: Malaria Journal
https://www.readbyqxmd.com/read/27901306/plants-microorganisms-and-soil-temperatures-contribute-to-a-decrease-in-methane-fluxes-on-a-drained-arctic-floodplain
#11
Min Jung Kwon, Felix Beulig, Iulia Ilie, Marcus Wildner, Kirsten Küsel, Lutz Merbold, Miguel D Mahecha, Nikita Zimov, Sergey A Zimov, Martin Heimann, Edward A G Schuur, Joel E Kostka, Olaf Kolle, Ines Hilke, Mathias Göckede
As surface temperatures are expected to rise in the future, ice-rich permafrost may thaw, altering soil topography and hydrology and creating a mosaic of wet and dry soil surfaces in the Arctic. Arctic wetlands are large sources of CH4 , and investigating effects of soil hydrology on CH4 fluxes is of great importance for predicting ecosystem feedback in response to climate change. In this study, we investigate how a decade-long drying manipulation on an Arctic floodplain influences CH4 -associated microorganisms, soil thermal regimes, and plant communities...
November 7, 2016: Global Change Biology
https://www.readbyqxmd.com/read/27900461/microbial-food-web-drivers-in-tropical-reservoirs
#12
Carolina Davila Domingues, Lucia Helena Sampaio da Silva, Luciana Machado Rangel, Leonardo de Magalhães, Adriana de Melo Rocha, Lúcia Meirelles Lobão, Rafael Paiva, Fábio Roland, Hugo Sarmento
Element cycling in aquatic systems is driven chiefly by planktonic processes, and the structure of the planktonic food web determines the efficiency of carbon transfer through trophic levels. However, few studies have comprehensively evaluated all planktonic food-web components in tropical regions. The aim of this study was to unravel the top-down controls (metazooplankton community structure), bottom-up controls (resource availability), and hydrologic (water residence time) and physical (temperature) variables that affect different components of the microbial food web (MFW) carbon stock in tropical reservoirs, through structural equation models (SEM)...
November 29, 2016: Microbial Ecology
https://www.readbyqxmd.com/read/27898802/nutrient-cycling-in-grassed-roadside-ditches-and-lawns-in-a-suburban-watershed
#13
Lauren E McPhillips, Peter M Groffman, Rebecca L Schneider, M Todd Walter
Roadside ditches are ubiquitous in developed landscapes. They are designed to route water from roads for safety, with little consideration of water quality or biogeochemical implications in ditch design and minimal data on environmental impacts. We hypothesize that periodic saturation and nutrient influxes may make roadside ditches hotspots for nitrogen (N) removal via denitrification as well as biological production of the greenhouse gases (GHGs) nitrous oxide (NO), methane (CH), and carbon dioxide (CO). Research sites included 12 grassed ditches and adjacent lawns with varying fertilization in a suburban watershed in central New York, where lawns represented a reference with similar soils as ditches but differing hydrology...
November 2016: Journal of Environmental Quality
https://www.readbyqxmd.com/read/27898792/soybean-area-and-baseflow-driving-nitrate-in-iowa-s-raccoon-river
#14
Gabriele Villarini, Christopher S Jones, Keith E Schilling
Improved understanding of the drivers of stream nitrate is necessary to improve water quality. This is particularly true for Iowa, a large contributor to Mississippi River Basin nitrate loads. Here, we focus on the Raccoon River at Des Moines, Iowa, and develop statistical models to describe the monthly (from March to August) nitrate concentrations in terms of eight drivers representing monthly climate, monthly hydrology, and yearly cropping practices. We consider six two-parameter distributions, linear and nonlinear dependencies between the predictors, and the distributions' parameters...
November 2016: Journal of Environmental Quality
https://www.readbyqxmd.com/read/27898790/assessment-of-carbon-stocks-in-the-topsoil-using-random-forest-and-remote-sensing-images
#15
Jongsung Kim, Sabine Grunwald
Wetland soils are able to exhibit both consumption and production of greenhouse gases, and they play an important role in the regulation of the global carbon (C) cycle. Still, it is challenging to accurately evaluate the actual amount of C stored in wetlands. The incorporation of remote sensing data into digital soil models has great potential to assess C stocks in wetland soils. Our objectives were (i) to develop C stock prediction models utilizing remote sensing images and environmental ancillary data, (ii) to identify the prime environmental predictor variables that explain the spatial distribution of soil C, and (iii) to assess the amount of C stored in the top 20-cm soils of a prominent nutrient-enriched wetland...
November 2016: Journal of Environmental Quality
https://www.readbyqxmd.com/read/27898782/prediction-of-pesticide-toxicity-in-midwest-streams
#16
Megan E Shoda, Wesley W Stone, Lisa H Nowell
The occurrence of pesticide mixtures is common in stream waters of the United States, and the impact of multiple compounds on aquatic organisms is not well understood. Watershed Regressions for Pesticides (WARP) models were developed to predict Pesticide Toxicity Index (PTI) values in unmonitored streams in the Midwest and are referred to as WARP-PTI models. The PTI is a tool for assessing the relative toxicity of pesticide mixtures to fish, benthic invertebrates, and cladocera in stream water. One hundred stream sites in the Midwest were sampled weekly in May through August 2013, and the highest calculated PTI for each site was used as the WARP-PTI model response variable...
November 2016: Journal of Environmental Quality
https://www.readbyqxmd.com/read/27894057/factors-influencing-the-occurrence-and-distribution-of-neonicotinoid-insecticides-in-surface-waters-of-southern-ontario-canada
#17
John Struger, Josey Grabuski, Steve Cagampan, Ed Sverko, Daryl McGoldrick, Christopher H Marvin
The widespread use of neonicotinoid insecticides and recent increased regulatory scrutiny requires the generation of monitoring data with sufficient scope and resolution to provide decision makers with a better understanding of occurrence and distribution in the environment. This study presents a wide-scale investigation of neonicotinoid insecticides used across the range of agricultural activities from fifteen surface water sites in southern Ontario. Using statistical analysis, the correlation of individual compounds with land use was investigated, and the relationship between neonicotinoid occurrence and hydrologic parameters in calibrated water courses was also assessed...
November 25, 2016: Chemosphere
https://www.readbyqxmd.com/read/27890476/spatial-and-temporal-dynamics-of-macrophyte-cover-in-a-large-regulated-river
#18
A Tena, D Vericat, L E Gonzalo, R J Batalla
The River Ebro basin is extensively dammed. Dams alter the geomorphological functioning of the river by altering its flow regime (e.g. reducing mean and maximum discharges), increasing bed stability (armouring) and decreasing turbidity (water clarity). These effects, together with an increase in nutrient concentrations and water temperature, have generated optimal conditions for the proliferation of aquatic macrophytes. In this paper, we analyse the temporal and spatial changes of macrophyte cover in the lowermost Ebro through a series of field campaigns carried out between 2009 and 2010...
November 24, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27890413/hydrological-and-depositional-processes-associated-with-recent-glacier-recession-in-yanamarey-catchment-cordillera-blanca-peru
#19
J I López-Moreno, B Valero-Garcés, B Mark, T Condom, J Revuelto, C Azorín-Molina, J Bazo, M Frugone, S M Vicente-Serrano, J Alejo-Cochachin
In this study, we investigate changes in the glaciated surface and the formation of lakes in the headwater of the Querococha watershed in Cordillera Blanca (Peru) using 24 Landsat images from 1975 to 2014. Information of glacier retreat was integrated with available climate data, the first survey of recent depositional dynamics in proglacial Yanamarey Lake (4600m a.s.l.), and a relatively short hydrological record (2002-2014) at the outlet of Yanamarey Lake. A statistically significant temperature warming (0...
November 24, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27890409/geochemistry-of-arsenic-in-low-sulfide-high-carbonate-coal-waste-rock-elk-valley-british-columbia-canada
#20
Ashis Biswas, M Jim Hendry, Joseph Essilfie-Dughan
This study investigated the geochemistry of arsenic (As) in low sulfide-high carbonate coal waste rock of the Elk Valley, British Columbia, Canada. Its abundance and mineralogical associations in waste rock of different placement periods were determined in addition to its mobilization into porewater and rock-drain effluent. The mean (5.34mg/kg; 95% confidence interval: 4.95-5.73mg/kg) As concentration in the waste rock was typical of sedimentary rock. Electron microprobe and As K-edge X-ray absorption near-edge spectroscopic analyses showed the As is predominantly associated with primary pyrites in both source and freshly blasted waste rock...
November 24, 2016: Science of the Total Environment
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