نتایج جستجو برای: lake level fluctuations

تعداد نتایج: 1182537  

Journal: :Science 1999
Enzel Ely Mishra Ramesh Amit Lazar Rajaguru Baker Sandler

Sediments from Lunkaransar dry lake in northwestern India reveal regional water table and lake level fluctuations over decades to centuries during the Holocene that are attributed to changes in the southwestern Indian monsoon rains. The lake levels were very shallow and fluctuated often in the early Holocene and then rose abruptly around 6300 carbon-14 years before the present (14C yr B.P.). Th...

2003
Y. Klinger J. P. Avouac D. Bourles N. Tisnerat

Based on geomorphic observations, we discuss lake-level fluctuations, alluvial deposition and river entrenchment in the Dead Sea–Wadi Araba area. The bulk of alluvium in the northern Wadi Araba was probably deposited before the Lisan period of lake transgression that started at about 70 kyears B.P. The lake reached a maximum elevation about 150 m below sea level (b.s.l.), possibly around 15 cal...

2006
Fasong Yuan Stephen S. Howe

Walker Lake, a hydrologically closed, saline, alkaline lake located along the western margin of the Great Basin of western United States, has experienced a 77% reduction in volume and commitment drop in lake level as a result of anthropogenic perturbations and climatic fluctuations over the last century. The history of lake-level change in Walker Lake has been recorded instrumentally since 1860...

2001
URSULA GAEDKE

[GAEDKE, U. & BARTHELMESS, T. & STRAlLE, D. (1996): Temporal variability of standing stocks of individual species, communities, and the entire plankton in two lakes of different trophic state: empirical evidence for hierarchy theory and emergent properties? Senckenbergiana marit. 27 (3/6): 169-177,2 figs., 3 tabs.; Frankfurt a. M.] Hierarchy theory claims that the structure and function of ecos...

1997
A. S. Cohen

Palaeogeographic and lake-level reconstructions provide powerful tools for evaluating competing scenarios of biotic, climatic and geological evolution within a lake basin. Here we present new reconstructions for the northern Lake Tanganyika subbasins, based on reflection seismic, core and outcrop data. Reflection seismic radiocarbon method (RSRM) age estimates provide a chronological model for ...

Journal: :Environmental monitoring and assessment 2006
Jiqun Zhang Kaiqin Xu Yonghui Yang Lianhui Qi Seiji Hayashi Masataka Watanabe

Although satellite radar altimetry was developed and optimized for open oceans, it has been used to monitor variations in the level of inland water-bodies such as lakes and rivers. Here, for the first time, we have further used the altimetry-derived variation of water level for estimating the fluctuation of water storage as an addition to the present in situ water storage estimation systems to ...

2000
Jean Nicolas Haas John H. McAndrews

High resolution paleoecological analyses from Shepherd Lake, Ontario, Canada, show that 10 to 100 year lake level fluctuations due to climatic change were responsible for alterations in the aquatic biodiversity 5,700 to 5,100 years ago. Thermophilic aquatics such as the Bushy pondweed Najas flexilis, charophyte algae and aquatic invertebrates indicate water level fluctuations of several meters,...

2013
B Nevado S Mautner C Sturmbauer E Verheyen

Understanding how genetic variation is generated and maintained in natural populations, and how this process unfolds in a changing environment, remains a central issue in biological research. In this work, we analysed patterns of genetic diversity from several populations of three cichlid species from Lake Tanganyika in parallel, using the mitochondrial DNA control region. We sampled population...

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