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https://www.readbyqxmd.com/read/28535602/quantifying-postglacial-sediment-storage-and-denudation-rates-in-a-small-alpine-catchment-of-the-f%C3%A4-g%C3%A4-ra%C3%A8-mountains-romania
#1
Adrian C Ardelean, Alexandru Onaca, Petru Urdea, Adriana Sărășan
The study of sediment production, transport, storage and discharge in alpine drainage basins is an essential prerequisite for a better understanding of the postglacial evolution of the alpine landscape. To get an overview on sediment production and alpine landscape evolution in Romania, the current study presents the first alpine sediment storage quantification in the Romanian Carpathians. Postglacial denudation was quantified within the small alpine catchment of the Doamnei Valley (3.62km(2)), located in the central part of the Făgăraș Mountains...
May 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28523791/genetic-assessment-of-the-effects-of-streamscape-succession-on-coho-salmon-oncorhynchus-kisutch-colonization-in-recently-deglaciated-streams
#2
K T Scribner, C Soiseth, J McGuire, G K Sage, L Thorsteinson, J L Nielsen, E Knudsen
Measures of genetic diversity within and among populations and historical geomorphological data on stream landscapes were used in model simulations based on approximate Bayesian computation (ABC) to examine hypotheses of the relative importance of stream features (geomorphology and age) associated with colonization events and gene flow for coho salmon Oncorhynchus kisutch breeding in recently deglaciated streams (50-240 years b.p.) in Glacier Bay National Park (GBNP), Alaska. Population estimates of genetic diversity including heterozygosity and allelic richness declined significantly and monotonically from the oldest and largest to youngest and smallest GBNP streams...
May 19, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28505366/bacterioplankton-assemblages-in-coastal-ponds-reflect-the-influence-of-hydrology-and-geomorphological-setting
#3
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/28498991/population-differentiation-in-common-walnut-juglans-regia-l-across-major-parts-of-its-native-range-insights-from-molecular-and-morphometric-data
#4
Wladimir Roor, Heino Konrad, Davletbek Mamadjanov, Thomas Geburek
Juglans regia is an economically highly important species for fruit and wood production in the warm temperate and subtropical zones of the Northern Hemisphere. Besides the natural influence of climatic and geomorphological barriers, its genetic structure has been strongly modified by humans and the population history is still unclear. For this reason, we investigated mainly natural walnut populations across the Eurasian continent on a molecular (44 populations, 581 trees) and morphometric level (23 populations, 1391 ripe nuts)...
June 1, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/28462018/glacial-allopatry-vs-postglacial-parapatry-and-peripatry-the-case-of-hedgehogs
#5
Barbora Černa Bolfíková, Kristýna Eliášová, Miroslava Loudová, Boris Kryštufek, Petros Lymberakis, Attila D Sándor, Pavel Hulva
Although hedgehogs are well-known examples of postglacial recolonisation, the specific processes that shape their population structures have not been examined by detailed sampling and fast-evolving genetic markers in combination with model based clustering methods. This study aims to analyse the impacts of isolation within glacial refugia and of postglacial expansion on the population structure of the Northern White-breasted hedgehog (Erinaceus roumanicus). It also discusses the role of the processes at edges of species distribution in its evolutionary history...
2017: PeerJ
https://www.readbyqxmd.com/read/28455820/a-review-of-source-tracking-techniques-for-fine-sediment-within-a-catchment
#6
REVIEW
Zhuo Guan, Xiang-Yu Tang, Jae E Yang, Yong Sik Ok, Zhihong Xu, Taku Nishimura, Brian J Reid
Excessive transport of fine sediment, and its associated pollutants, can cause detrimental impacts in aquatic environments. It is therefore important to perform accurate sediment source apportionment to identify hot spots of soil erosion. Various tracers have been adopted, often in combination, to identify sediment source type and its spatial origin; these include fallout radionuclides, geochemical tracers, mineral magnetic properties and bulk and compound-specific stable isotopes. In this review, the applicability of these techniques to particular settings and their advantages and limitations are reviewed...
April 28, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28452366/the-inheritance-of-a-mesozoic-landscape-in-western-scandinavia
#7
Ola Fredin, Giulio Viola, Horst Zwingmann, Ronald Sørlie, Marco Brönner, Jan-Erik Lie, Else Margrethe Grandal, Axel Müller, Annina Margreth, Christoph Vogt, Jochen Knies
In-situ weathered bedrock, saprolite, is locally found in Scandinavia, where it is commonly thought to represent pre-Pleistocene weathering possibly associated with landscape formation. The age of weathering, however, remains loosely constrained, which has an impact on existing geological and landscape evolution models and morphotectonic correlations. Here we provide new geochronological evidence that some of the low-altitude basement landforms on- and offshore southwestern Scandinavia are a rejuvenated geomorphological relic from Mesozoic times...
April 28, 2017: Nature Communications
https://www.readbyqxmd.com/read/28431370/hydrodynamic-influence-on-reservoir-sustainability-in-semi-arid-climate-a-physicochemical-and-environmental-isotopic-study
#8
Rawaa Ammar, Véronique Kazpard, Antoine G El Samrani, Nabil Amacha, Zeinab Saad, Lei Chou
Water scarcity and increasing water demand require the development of water management plans such as establishing artificial lakes and dams. Plans to meet water needs are faced by uprising challenges to improve water quality and to ensure the sustainability of hydro-projects. Environmental isotopes coupled to water physicochemical characteristics were investigated over a biennial cycle to assess both geomorphological and environmental impacts on the water quality of a reservoir situated in an intensively used agricultural watershed under a Mediterranean semi-arid climate...
April 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28407457/dynamics-of-sediment-carbon-stocks-across-intertidal-wetland-habitats-of-moreton-bay-australia
#9
Matthew A Hayes, Amber Jesse, Bruce Hawke, Jeff Baldock, Basam Tabet, David Lockington, Catherine E Lovelock
Coastal wetlands are known for high carbon storage within their sediments, but our understanding of the variation in carbon storage among intertidal habitats, particularly over geomorphological settings and along elevation gradients, are limited. Here, we collected 352 cores from 18 sites across Moreton Bay, Australia. We assessed variation in sediment organic carbon (OC) stocks among different geomorphological settings (wetlands within riverine settings along with those with reduced riverine influence located on tide-dominated sand islands), across elevation gradients, with distance from shore and among habitat and vegetation types...
April 13, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28402914/potential-interaction-between-transport-and-stream-networks-over-the-lowland-rivers-in-eastern-india
#10
Suvendu Roy, Abhay Sankar Sahu
Extension of transport networks supports good accessibility and associated with the development of a region. However, transport lines have fragmented the regional landscape and disturbed the natural interplay between rivers and their floodplains. Spatial analysis using multiple buffers provides information about the potential interaction between road and stream networks and their impact on channel morphology of a small watershed in the Lower Gangetic Plain. Present study is tried to understand the lateral and longitudinal disconnection in headwater stream by rural roads with the integration of geoinformatics and field survey...
April 9, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28391145/topsoil-moisture-mapping-using-geostatistical-techniques-under-different-mediterranean-climatic-conditions
#11
J F Martínez-Murillo, P Hueso-González, J D Ruiz-Sinoga
Soil mapping has been considered as an important factor in the widening of Soil Science and giving response to many different environmental questions. Geostatistical techniques, through kriging and co-kriging techniques, have made possible to improve the understanding of eco-geomorphologic variables, e.g., soil moisture. This study is focused on mapping of topsoil moisture using geostatistical techniques under different Mediterranean climatic conditions (humid, dry and semiarid) in three small watersheds and considering topography and soil properties as key factors...
October 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28332082/detection-of-terrain-indices-related-to-soil-salinity-and-mapping-salt-affected-soils-using-remote-sensing-and-geostatistical-techniques
#12
Hela Triki Fourati, Moncef Bouaziz, Mourad Benzina, Samir Bouaziz
Traditional surveying methods of soil properties over landscapes are dramatically cost and time-consuming. Thus, remote sensing is a proper choice for monitoring environmental problem. This research aims to study the effect of environmental factors on soil salinity and to map the spatial distribution of this salinity over the southern east part of Tunisia by means of remote sensing and geostatistical techniques. For this purpose, we used Advanced Spaceborne Thermal Emission and Reflection Radiometer data to depict geomorphological parameters: elevation, slope, plan curvature (PLC), profile curvature (PRC), and aspect...
April 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28319713/observational-evidence-on-the-effects-of-mega-fires-on-the-frequency-of-hydrogeomorphic-hazards-the-case-of-the-peloponnese-fires-of-2007-in-greece
#13
M Diakakis, E I Nikolopoulos, S Mavroulis, E Vassilakis, E Korakaki
Even though rare, mega-fires raging during very dry and windy conditions, record catastrophic impacts on infrastructure, the environment and human life, as well as extremely high suppression and rehabilitation costs. Apart from the direct consequences, mega-fires induce long-term effects in the geomorphological and hydrological processes, influencing environmental factors that in turn can affect the occurrence of other natural hazards, such as floods and mass movement phenomena. This work focuses on the forest fire of 2007 in Peloponnese, Greece that to date corresponds to the largest fire in the country's record that burnt 1773km(2), causing 78 fatalities and very significant damages in property and infrastructure...
March 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28295834/an-expert-system-model-for-mapping-tropical-wetlands-and-peatlands-reveals-south-america-as-the-largest-contributor
#14
Thomas Gumbricht, Rosa Maria Roman-Cuesta, Louis Verchot, Martin Herold, Florian Wittmann, Ethan Householder, Nadine Herold, Daniel Murdiyarso
Wetlands are important providers of ecosystem services and key regulators of climate change. They positively contribute to global warming through their greenhouse gas emissions, and negatively through the accumulation of organic material in histosols, particularly in peatlands. Our understanding of wetlands' services is currently constrained by limited knowledge on their distribution, extent, volume, interannual flood variability and disturbance levels. We present an expert system approach to estimate wetland and peatland areas, depths and volumes, which relies on three biophysical indices related to wetland and peat formation: (1) long-term water supply exceeding atmospheric water demand; (2) annually or seasonally water-logged soils; and (3) a geomorphological position where water is supplied and retained...
March 15, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28285852/arsenic-in-bangladeshi-soils-related-to-physiographic-region-paddy-management-and-mirco-and-macro-elemental-status
#15
M Tanvir A Chowdhury, Claire M Deacon, Gerrad D Jones, S M Imamul Huq, Paul N Williams, A F M Manzurul Hoque, Lenny H E Winkel, Adam H Price, Gareth J Norton, Andrew A Meharg
While the impact of arsenic in irrigated agriculture has become a major environmental concern in Bangladesh, to date there is still a limited understanding of arsenic in Bangladeshi paddy soils at a landscape level. A soil survey was conducted across ten different physiographic regions of Bangladesh, which encompassed six types of geomorphology (Bil, Brahmaputra floodplain, Ganges floodplain, Meghna floodplain, Karatoya-Bangali floodplain and Pleistocene terrace). A total of 1209 paddy soils and 235 matched non-paddy soils were collected...
March 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28281574/carbon-sequestration-by-australian-tidal-marshes
#16
Peter I Macreadie, Q R Ollivier, J J Kelleway, O Serrano, P E Carnell, C J Ewers Lewis, T B Atwood, J Sanderman, J Baldock, R M Connolly, C M Duarte, P S Lavery, A Steven, C E Lovelock
Australia's tidal marshes have suffered significant losses but their recently recognised importance in CO2 sequestration is creating opportunities for their protection and restoration. We compiled all available data on soil organic carbon (OC) storage in Australia's tidal marshes (323 cores). OC stocks in the surface 1 m averaged 165.41 (SE 6.96) Mg OC ha(-1) (range 14-963 Mg OC ha(-1)). The mean OC accumulation rate was 0.55 ± 0.02 Mg OC ha(-1) yr(-1). Geomorphology was the most important predictor of OC stocks, with fluvial sites having twice the stock of OC as seaward sites...
March 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28261468/water-land-fire-and-forest-multi-scale-determinants-of-rainforests-in-the-australian-monsoon-tropics
#17
Stefania Ondei, Lynda D Prior, Grant J Williamson, Tom Vigilante, David M J S Bowman
The small rainforest fragments found in savanna landscapes are powerful, yet often overlooked, model systems to understand the controls of these contrasting ecosystems. We analyzed the relative effect of climatic variables on rainforest density at a subcontinental level, and employed high-resolution, regional-level analyses to assess the importance of landscape settings and fire activity in determining rainforest density in a frequently burnt Australian savanna landscape. Estimates of rainforest density (ha/km(2)) across the Northern Territory and Western Australia, derived from preexisting maps, were used to calculate the correlations between rainforest density and climatic variables...
March 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28242222/topographic-and-geomorphologic-controls-on-the-distribution-of-vegetation-formations-in-elephant-point-livingston-island-maritime-antarctica
#18
Jesús Ruiz-Fernández, Marc Oliva, Cristina García-Hernández
This article focuses on the spatial distribution of vegetation formations in Elephant Point, an ice-free area of 1.16km(2) located in Livingston Island (South Shetland Islands, Antarctica). Fieldwork carried out in January 2014 consisted of floristic surveys and designation of a vegetation map. We have examined these data in a GIS environment together with topographical and geomorphological features existing in the peninsula in order to infer the factors controlling vegetation distribution. This has allowed quantifying the total area covered by the four different vegetation formations distributed across the peninsula, proliferating mainly on bedrock plateaus and Holocene raised beaches...
February 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28240223/the-world-s-earliest-aral-sea-type-disaster-the-decline-of-the-loulan-kingdom-in-the-tarim-basin
#19
Steffen Mischke, Chenglin Liu, Jiafu Zhang, Chengjun Zhang, Hua Zhang, Pengcheng Jiao, Birgit Plessen
Remnants of cities and farmlands in China's hyperarid Tarim Basin indicate that environmental conditions were significantly wetter two millennia ago in a region which is barren desert today. Historical documents and age data of organic remains show that the Loulan Kingdom flourished during the Han Dynasty (206 BCE-220 CE) but was abandoned between its end and 645 CE. Previous archaeological, geomorphological and geological studies suggest that deteriorating climate conditions led to the abandonment of the ancient desert cities...
February 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28239369/plant-growth-promoting-bacteria-associated-with-langsdorffia-hypogaea-rhizosphere-host-biological-interface-a-neglected-model-of-bacterial-prospection
#20
Érica B Felestrino, Iara F Santiago, Luana da Silva Freitas, Luiz H Rosa, Sérvio P Ribeiro, Leandro M Moreira
Soil is a habitat where plant roots and microorganisms interact. In the region of the Brazilian Iron Quadrangle (IQ), studies involving the interaction between microbiota and plants have been neglected. Even more neglected are the studies involving the holoparasite plant Langsdorffia hypogaea Mart. (Balanophoraceae). The geomorphological peculiarities of IQ soil, rich in iron ore, as well as the model of interaction between L. hypogaea, its hosts and the soil provide a unique niche that acts as selective pressure to the evolution of plant growth-promoting bacteria (PGPB)...
2017: Frontiers in Microbiology
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