نتایج جستجو برای: lake level fluctuations

تعداد نتایج: 1182537  

2010
Shela J. Patrickson Dorothy Sack Andrea R. Brunelle Katrina A. Moser

a r t i c l e i n f o Keywords: Great Basin Lake Bonneville Great Salt Lake Stansbury Island Stansbury shoreline Stansbury oscillation Stansbury Gulch Paleolake chronology Paleoclimate Multiple proxy This paper reports on recent multiproxy research conducted to determine the chronology of lake-level fluctuations recorded in sediments from a natural exposure at a classic Bonneville basin site. G...

2005
A. L. JENSEN

Conventional surplus production models indicate that destruction of fish populations by overfishing is difficult, if not impossible, but catastrophic declines in abundance of exploited populations are common. Surplus production models also do not predict large continuing fluctuations in yield, but large fluctuations in yield are common. Conventional surplus production models assume that fisheri...

2003
Darrell S. Kaufman Feng Sheng Hu Jason P. Briner Al Werner Bruce P. Finney Irene Gregory-Eaves

A continuous record of lacustrine sedimentation capturing the entire full-glacial period was obtained from Arolik Lake in the Ahklun Mountains, southwestern Alaska. Fluctuations in magnetic susceptibility (MS), grain size, organic-matter (OM) content, C/N ratios, C, and biogenic silica (BSi) record marked environmental changes within the lake and its watershed during the last 33 cal ka. Age con...

Journal: :Molecular biology and evolution 2001
C Sturmbauer S Baric W Salzburger L Rüber E Verheyen

Water level fluctuations are important modulators of speciation processes in tropical lakes, in that they temporarily form or break down barriers to gene flow among adjacent populations and/or incipient species. Time estimates of the most recent major lowstands of the three African Great Lakes are thus crucial to infer the relative timescales of explosive speciation events in cichlid species fl...

Journal: :Zoological science 2007
Masato Hirose Shunsuke F Mawatari

We identified a collection of freshwater bryozoans from Tonle Sap (meaning Tonle Lake), Cambodia, a body of water fed by the Mekong River and characterized by extreme fluctuations in water level between the wet and dry seasons. The collection also included specimens from the moat of Angkor Wat, located at the north end of the lake. We found four phylactolaemate species (Plumatella bombayensis, ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2016
Sarah J Ivory Margaret W Blome John W King Michael M McGlue Julia E Cole Andrew S Cohen

Long paleoecological records are critical for understanding evolutionary responses to environmental forcing and unparalleled tools for elucidating the mechanisms that lead to the development of regions of high biodiversity. We use a 1.2-My record from Lake Malawi, a textbook example of biological diversification, to document how climate and tectonics have driven ecosystem and evolutionary dynam...

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