نتایج جستجو برای: supratidal environment

تعداد نتایج: 517929  

2013
Yu Wenjin Zou Xinqing

After the analysis of surface samples and core samples collected in Xinyanggang tidal land, the contents of Pb, Cu, Zn, and Cr were obtained and analyzed in this paper. The heavy metal accumulation rule and pollution status were studied by Index of geo-accumulation, latent ecological risk index method, and elements accumulation index method. The research suggests that (1) the contents of heavy ...

2011
Matthew C. Phillips Helena M. Solo-Gabriele Alan M. Piggot James S. Klaus Yifan Zhang

Enterococci are used to assess the risk of negative human health impacts from recreational waters. Studies have shown sustained populations of enterococci within sediments of beaches but comprehensive surveys of multiple tidal zones on beaches in a regional area and their relationship to beach management decisions are limited. We sampled three tidal zones on eight South Florida beaches in Miami...

Journal: :Frontiers in Marine Science 2021

Because Kemp’s ridley sea turtles ( Lepidochelys kempii ) are critically endangered and closely related to the vulnerable olive ridleys L. olivacea ), it is essential for forensic investigations conservation efforts distinguish these species when only skeletal elements remain. DNA extraction analysis by sequencing of genetic markers method determine identity reliably, yet methods significantly ...

2007
ALLAN J LERNER SPENCER G. LUCAS JUSTIN A. SPIELMANN

An invertebrate ichnoassemblage from the Moenkopi Group (Spathian Ankareh Formation) at Diamond Creek in north-central Utah consists of Gordia marina Emmons, Helminthopsis hieroglyphica Wetzel and Bromley and irregular networks similar to Unisulcus. This is the first record of Gordia and Helminthopsis from the Moenkopi Group. This low diversity ichnoassemblage, consisting of simple grazing trac...

Journal: :Palaeobiodiversity and Palaeoenvironments 2021

Abstract A late early Maastrichtian dinosaur trampling site is reported from the Farrokhi Formation of Khur area, Central Iran. The largely indeterminate footprints, some which may represent undertracks, can be classified as natural moulds (i.e. concave epireliefs) bordered by a raised rim displaced sediment. They reach diameters up to 0.5 m and were impressed under very shallow subaerial condi...

Journal: :Frontiers in Marine Science 2022

Coastal environments, ecologically fragile zones, are subjected to great human pressures, particularly, xenobiotic pollutants such as microplastics (MPs) and trace metals. Yet, the impact of anthropogenic intervention on spatial patterns MPs in different coastal environmental compartments Qingdao, a city located west Yellow Sea, is still unclear. Therefore, distribution, characteristics, divers...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مهندسی عمران 1391

one of the most commonly used techniques to reduce the corrosion rate of rebar in concrete is addition substances named corrosion inhibitors into the concrete. corrosion inhibitor is chemical compounds that were added to concrete to prevent corrosion of steel in concrete. sodium nitrate is a type of anodic inhibitors that this study investigatesthe effect of this inhibitor on the properties of ...

Journal: :Marine Biodiversity 2023

Abstract Over the past 70 years, numerous authors studied platyhelminth fauna near island of Sylt in eastern North Sea, each with a specific focus on varying aspects ecology, morphology or systematics, and most them dealing single habitat type. These data are combined new to get comprehensive view species richness, distribution individual across tidal levels sediment types resulting communities...

Journal: Geopersia 2019

Extreme coastal inundation associated with the 2004 Indian Ocean and 1945 Makran tsunamigenic-earthquakes highlight the risk of tsunamis to coastlines of the northern Oman Sea. Foraminifera have been used as indicators of paleotsunamis in the past where allochthonous tests, found in low-energy environments such as in coastal lagoons, ponds, and marshes, indicate marine overwash. In this study, ...

Journal: :Minerals 2023

The thick Upper Cambrian Xixiangchi dolostones, developed in the Sichuan Basin, are an important deep exploration target, but their genesis is still controversial, which hinders predicting porous dolomite distribution and related potential hydrocarbon play. Herein, based on observation sampling of field outcrops, combined with a microscopic thin section analysis, cathodoluminescence geochemical...

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