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https://www.readbyqxmd.com/read/28535599/monitoring-spatiotemporal-variations-in-nutrients-in-a-large-drinking-water-reservoir-and-their-relationships-with-hydrological-and-meteorological-conditions-based-on-landsat-8-imagery
#1
Yuan Li, Yunlin Zhang, Kun Shi, Guangwei Zhu, Yongqiang Zhou, Yibo Zhang, Yulong Guo
Nutrient enrichment is a major cause of water eutrophication, and variations in nutrient enrichment are influenced by environmental changes and anthropogenic activities. Accurately estimating nutrient concentrations and understanding their relationships with environmental factors are vital to develop nutrient management strategies to mitigate eutrophication. Landsat 8 Operational Land Imager (OLI) data is used to estimate nutrient concentrations and analyze their responses to hydrological and meteorological conditions...
May 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28534871/development-of-a-gridded-meteorological-dataset-over-java-island-indonesia-1985-2014
#2
Yanto, Ben Livneh, Balaji Rajagopalan
We describe a gridded daily meteorology dataset consisting of precipitation, minimum and maximum temperature over Java Island, Indonesia at 0.125°×0.125° (~14 km) resolution spanning 30 years from 1985-2014. Importantly, this data set represents a marked improvement from existing gridded data sets over Java with higher spatial resolution, derived exclusively from ground-based observations unlike existing satellite or reanalysis-based products. Gap-infilling and gridding were performed via the Inverse Distance Weighting (IDW) interpolation method (radius, r, of 25 km and power of influence, α, of 3 as optimal parameters) restricted to only those stations including at least 3,650 days (~10 years) of valid data...
May 23, 2017: Scientific Data
https://www.readbyqxmd.com/read/28533540/recent-changes-in-daily-climate-extremes-in-an-arid-mountain-region-a-case-study-in-northwestern-china-s-qilian-mountains
#3
Pengfei Lin, Zhibin He, Jun Du, Longfei Chen, Xi Zhu, Jing Li
Changes in climate extremes pose far-reaching consequences to ecological processes and hydrologic cycles in alpine ecosystems of the arid mountain regions. Therefore, regional assessments in various climates and mountain regions are needed for understanding the uncertainties of the change trends for extreme climate events. The objective of this study was to assess the spatial distribution and temporal trends of extreme precipitation and temperature events responses to global warming on the arid mountain regions of China...
May 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28531202/the-role-of-density-dependent-and-independent-processes-in-spawning-habitat-selection-by-salmon-in-an-arctic-riverscape
#4
Brock M Huntsman, Jeffrey A Falke, James W Savereide, Katrina E Bennett
Density-dependent (DD) and density-independent (DI) habitat selection is strongly linked to a species' evolutionary history. Determining the relative importance of each is necessary because declining populations are not always the result of altered DI mechanisms but can often be the result of DD via a reduced carrying capacity. We developed spatially and temporally explicit models throughout the Chena River, Alaska to predict important DI mechanisms that influence Chinook salmon spawning success. We used resource-selection functions to predict suitable spawning habitat based on geomorphic characteristics, a semi-distributed water-and-energy balance hydrologic model to generate stream flow metrics, and modeled stream temperature as a function of climatic variables...
2017: PloS One
https://www.readbyqxmd.com/read/28528391/dynamism-in-the-upstream-invasion-edge-of-a-freshwater-fish-exposes-range-boundary-constraints
#5
Erika S Rubenson, Julian D Olden
Studying the dynamics of species' borders can provide insight into the mechanisms limiting or promoting range expansion in response to environmental change. In the John Day River, Oregon (USA), rising stream temperatures are facilitating the upstream expansion of invasive smallmouth bass Micropterus dolomieu. Here, where smallmouth bass occupy the upstream limit of its thermal tolerance, we explore population structure and seasonal movement patterns to elucidate the environmental conditions and individual traits that define front edge (where individuals reside year-round) and leading edge (where individuals colonize, but may not establish) limits to its upstream distribution...
May 20, 2017: Oecologia
https://www.readbyqxmd.com/read/28527141/rice-agriculture-impacts-catchment-hydrographic-patterns-and-nitrogen-export-characteristics-in-subtropical-central-china-a-paired-catchment-study
#6
Yi Wang, Xinliang Liu, Hua Wang, Yong Li, Yuyuan Li, Feng Liu, Runlin Xiao, Jianlin Shen, Jinshui Wu
Increased nitrogen (N) concentrations in water bodies have highlighted issues regarding nutrient pollution in agricultural catchments. In this study, the ammonium-N (NH4(+)-N), nitrate-N (NO3(-)-N), and total N (TN) concentrations were observed in the stream water and groundwater of two contrasting catchments (named Tuojia and Jianshan) in subtropical central China from 2010 to 2014, to determine the rice agriculture impacts on the hydrographic patterns, and N export characteristics of the catchments. The results suggested that greater amounts of stream flow (523...
May 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28526833/grassland-restoration-reduces-water-yield-in-the-headstream-region-of-yangtze-river
#7
Jia Li, Dan Liu, Tao Wang, Yingnian Li, Shiping Wang, Yuting Yang, Xiaoyi Wang, Hui Guo, Shushi Peng, Jinzhi Ding, Miaogen Shen, Lei Wang
Large-scale ecological restoration programs are considered as one of the key strategies to enhance ecosystem services. The Headstream region of Yangtze River (HYZR), which is claimed to be China's Water Tower but witnessed the rapid grassland deterioration during 1970s-2000, has seen a series of grassland restoration programs since 2000. But few studies have thoroughly estimated the hydrological effect of this recent grassland restoration. Here we show that restoration significantly reduces growing-season water yield coefficient (WYC) from 0...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28521387/structural-and-functional-recovery-of-macroinvertebrate-communities-and-leaf-litter-decomposition-after-a-marked-drought-does-vegetation-type-matter
#8
Silvia Monroy, Aingeru Martínez, Naiara López-Rojo, Ana Victoria Pérez-Calpe, Ana Basaguren, Jesús Pozo
Climate change and anthropogenic disturbances are expected to lead to more intense and frequent droughts, with potentially severe effects on structure and function of perennial temperate streams. However, more information is required on whether streams flowing through basins already affected by exotic plantations will respond to droughts in the same way as streams under native forests. The recolonisation dynamics of benthic macroinvertebrate communities and leaf litter decomposition rates were examined in nine streams of oceanic-temperate climate that differed in catchment vegetation (three streams draining native deciduous forest, three in pine plantations and three in eucalypt plantations) after a marked drought...
May 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28520714/alteration-of-stream-temperature-by-natural-and-artificial-beaver-dams
#9
Nicholas Weber, Nicolaas Bouwes, Michael M Pollock, Carol Volk, Joseph M Wheaton, Gus Wathen, Jacob Wirtz, Chris E Jordan
Beaver are an integral component of hydrologic, geomorphic, and biotic processes within North American stream systems, and their propensity to build dams alters stream and riparian structure and function to the benefit of many aquatic and terrestrial species. Recognizing this, beaver relocation efforts and/or application of structures designed to mimic the function of beaver dams are increasingly being utilized as effective and cost-efficient stream and riparian restoration approaches. Despite these verities, the notion that beaver dams negatively impact stream habitat remains common, specifically the assumption that beaver dams increase stream temperatures during summer to the detriment of sensitive biota such as salmonids...
2017: PloS One
https://www.readbyqxmd.com/read/28518073/extraction-and-characterization-of-surfactants-from-atmospheric-aerosols
#10
Barbara Nozière, Violaine Gérard, Christine Baduel, Corinne Ferronato
Surface-active compounds, or surfactants, present in atmospheric aerosols are expected to play important roles in the formation of liquid water clouds in the Earth's atmosphere, a central process in meteorology, hydrology, and for the climate system. But because specific extraction and characterization of these compounds have been lacking for decades, very little is known on their identity, properties, mode of action and origins, thus preventing the full understanding of cloud formation and its potential links with the Earth's ecosystems...
April 21, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28515894/reproductive-ecology-of-interior-least-tern-and-piping-plover-in-relation-to-platte-river-hydrology-and-sandbar-dynamics
#11
Jason M Farnsworth, David M Baasch, Chadwin B Smith, Kevin L Werbylo
Investigations of breeding ecology of interior least tern (Sternula antillarum athalassos) and piping plover (Charadrius melodus) in the Platte River basin in Nebraska, USA, have embraced the idea that these species are physiologically adapted to begin nesting concurrent with the cessation of spring floods. Low use and productivity on contemporary Platte River sandbars have been attributed to anthropomorphically driven changes in basin hydrology and channel morphology or to unusually late annual runoff events...
May 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28511357/establishing-and-testing-a-catchment-water-footprint-framework-to-inform-sustainable-irrigation-water-use-for-an-aquifer-under-stress
#12
Betsie le Roux, Michael van der Laan, Teunis Vahrmeijer, Keith L Bristow, John G Annandale
Future water scarcities in the face of an increasing population, climate change and the unsustainable use of aquifers will present major challenges to global food production. The ability of water footprints (WFs) to inform water resource management at catchment-scale was investigated on the Steenkoppies Aquifer, South Africa. Yields based on cropping areas were multiplied with season-specific WFs for each crop to determine blue and green water consumption by agriculture. Precipitation and evapotranspiration of natural vegetation and other uses of blue water were included with the agricultural WFs to compare water availability and consumption in a catchment sustainability assessment...
May 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28511353/assessment-of-water-retention-function-as-tool-to-improve-integrated-watershed-management-case-study-of-poprad-river-basin-slovakia
#13
Barbora Šatalová, Pavol Kenderessy
The presented study concentrates on assessing the ecosystem function of water retention. The water retention function is defined as the ability of the landscape to retain water, slow runoff and encourage water infiltration. The water retention function was expressed by calculating the hydric significance (HS) indicator. This method is based on scoring the individual input parameters according to their overall impact on watershed hydrology. The study was conducted on a sample area of Poprad River basin. The final results presented a spatial distribution of hydric function within the watershed classified according to its significance into four classes (from limited to excellent significance)...
May 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28511348/integrated-flood-hazard-assessment-based-on-spatial-ordered-weighted-averaging-method-considering-spatial-heterogeneity-of-risk-preference
#14
Yangfan Xiao, Shanzhen Yi, Zhongqian Tang
Flood is the most common natural hazard in the world and has caused serious loss of life and property. Assessment of flood prone areas is of great importance for watershed management and reduction of potential loss of life and property. In this study, a framework of multi-criteria analysis (MCA) incorporating geographic information system (GIS), fuzzy analytic hierarchy process (AHP) and spatial ordered weighted averaging (OWA) method was developed for flood hazard assessment. The factors associated with geographical, hydrological and flood-resistant characteristics of the basin were selected as evaluation criteria...
May 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28508259/investigation-of-the-scaling-characteristics-of-landsat-temperature-and-vegetation-data-a-wavelet-based-approach
#15
Maheswaran Rathinasamy, V M Bindhu, Jan Adamowski, Balaji Narasimhan, Rakesh Khosa
An investigation of the scaling characteristics of vegetation and temperature data derived from LANDSAT data was undertaken for a heterogeneous area in Tamil Nadu, India. A wavelet-based multiresolution technique decomposed the data into large-scale mean vegetation and temperature fields and fluctuations in horizontal, diagonal, and vertical directions at hierarchical spatial resolutions. In this approach, the wavelet coefficients were used to investigate whether the normalized difference vegetation index (NDVI) and land surface temperature (LST) fields exhibited self-similar scaling behaviour...
May 16, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/28507821/the-density-and-biomass-of-mesozooplankton-and-ichthyoplankton-in-the-negro-and-the-amazon-rivers-during-the-rainy-season-the-ecological-importance-of-the-confluence-boundary
#16
Ryota Nakajima, Elvis V Rimachi, Edinaldo N Santos-Silva, Laura S F Calixto, Rosseval G Leite, Adi Khen, Tetsuo Yamane, Anthony I Mazeroll, Jomber C Inuma, Erika Y K Utumi, Akira Tanaka
The boundary zone between two different hydrological regimes is often a biologically enriched environment with distinct planktonic communities. In the center of the Amazon River basin, muddy white water of the Amazon River meets with black water of the Negro River, creating a conspicuous visible boundary spanning over 10 km along the Amazon River. Here, we tested the hypothesis that the confluence boundary between the white and black water rivers concentrates prey and is used as a feeding habitat for consumers by investigating the density, biomass and distribution of mesozooplankton and ichthyoplankton communities across the two rivers during the rainy season...
2017: PeerJ
https://www.readbyqxmd.com/read/28505891/modelling-sediment-fluxes-in-the-danube-river-basin-with-swat
#17
Olga Vigiak, Anna Malagó, Fayçal Bouraoui, Matthias Vanmaercke, Florin Obreja, Jean Poesen, Helmut Habersack, János Fehér, Samo Grošelj
Sediment management is of prior concern in the Danube Basin for provision of economic and environmental services. This study aimed at assessing current (1995-2009) sediment fluxes of the Danube Basin with SWAT model and identifying sediment budget knowledge gaps. After hydrologic calibration, hillslope gross erosion and sediment yields were broadly calibrated using ancillary data (measurements in plots and small catchments, and national and European erosion maps). Mean annual sediment concentrations (SSC) from 269 gauging stations (2968 station-year entries; median 19mg/L, interquartile range IQR 10-36mg/L) were used for calibrating in-stream sediments...
May 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28505366/bacterioplankton-assemblages-in-coastal-ponds-reflect-the-influence-of-hydrology-and-geomorphological-setting
#18
Megan J Huggett, Christopher R J Kavazos, Rachele Bernasconi, Robert Czarnik, Pierre Horwitz
The factors that shape microbial community assembly in aquatic ecosystems have been widely studied yet it is still unclear how distinct communities within a connected landscape influence one another. Coastal lakes are recipients of, and thus are connected to, both marine and terrestrial environments. Thus they may host microbial assemblages that reflect the relative degree of influence by, and connectivity to, either system. In order to address this idea we interrogated microbial community diversity at 49 sites in seven ponds in two seasons in the Lake MacLeod basin, a system fed by seawater flowing inland through underground karst...
May 15, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28504426/mosquito-distribution-in-a-saltmarsh-determinants-of-eggs-in-a-variable-environment
#19
Raylea Rowbottom, Scott Carver, Leon A Barmuta, Philip Weinstein, Geoff R Allen
Two saltmarsh mosquitoes dominate the transmission of Ross River virus (RRV, Togoviridae: Alphavirus), one of Australia's most prominent mosquito-borne diseases. Ecologically, saltmarshes vary in their structure, including habitat types, hydrological regimes, and diversity of aquatic fauna, all of which drive mosquito oviposition behavior. Understanding the distribution of vector mosquitoes within saltmarshes can inform early warning systems, surveillance, and management of vector populations. The aim of this study was to identify the distribution of Ae...
June 2017: Journal of Vector Ecology: Journal of the Society for Vector Ecology
https://www.readbyqxmd.com/read/28501963/salinity-driven-decadal-changes-in-phytoplankton-community-in-the-nw-arabian-gulf-of-kuwait
#20
Turki Al-Said, Aws Al-Ghunaim, D V Subba Rao, Faiza Al-Yamani, Kholood Al-Rifaie, Ali Al-Baz
Evaluation of hydrological data obtained between 2000 and 2013 from a time series station in Kuwait Bay (station K6) and an offshore southern location (station 18) off Kuwait showed drastic increase in salinity by 6 units. We tested the hypothesis that increased salinity impacted phytoplankton community characteristics in these semiarid waters. The Arabian Gulf receives seasonal freshwater discharge in the north via Shatt Al-Arab estuary with a peak during March-July. A north to south gradient in the proportion of the freshwater exists between station A in the vicinity of Shatt Al-Arab estuary and station 18 in the southern offshore area...
June 2017: Environmental Monitoring and Assessment
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