Lake Champlain In Transition

Author : Thomas O. Manley
Publisher : American Geophysical Union
ISBN 13 :
Total Pages : 472 pages
Book Rating : 4.56/5 ( download)

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Download or read book Lake Champlain in Transition written by Thomas O. Manley and published by American Geophysical Union. This book was released on 1999-01-26 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Water Science and Application Series, Volume 1. Lake Champlain in Transition: From Research Toward Restoration synthesizes research studies on the chemistry, biology, atmospherics, hydrodynamics, hydrology, land use, and management of Lake Champlain and its basin. Additional studies define the cultlural, social, and economic pressures on the lake's ecosystemm. The volume presents research results on lake sediment toxicity and its effect on benthic and aquatic species. Trophic levels were studied, from the impacts of nitrogen and phosphorus on phytoplankton to multiple "trophic cascades" and management implications. Phosphorus loading and subsequent eutrophication was examined by looking at comprehensive loading budgets, a whole-lake mass-balance model, and subsequent management schemes. This comprehensive research effort was undertaken to develop a management plan devoted to preserving the lake ecosystem, and the volume will interest environmental planners and managers as well as limnologists and hydrologists.

Author : Elizabeth Humstone
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.39/5 ( download)

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Download or read book Lands in Transition written by Elizabeth Humstone and published by . This book was released on 1978 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Ashliegh Theresa Belrose
Publisher :
ISBN 13 :
Total Pages : 284 pages
Book Rating : 4.22/5 ( download)

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Download or read book The Champlain Sea/Lake Champlain Transition Recorded In The Northeast Arm Of Lake Champlain, USA-Canada written by Ashliegh Theresa Belrose and published by . This book was released on 2015 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sediment accumulated on a lakebed archives information about past climate and changes in the regional environment. Previous studies (Burgess, 2007; Koff, 2011; Palmer, 2012) in the Northeast Arm of Lake Champlain, specifically Missisquoi Bay and Saint Albans Bay, showed a period (~9,400 - 8,600 yBP) of elevated organic matter deposition in both bays, indicating a productive event that pre-dated any possible anthropogenic influence. However, the record was abruptly cut off and any documentation representing the span of time leading up to this event was not found. The elevated organic matter levels were explained as being the result of a warm, dry environment that reduced lake level and promoted productivity within the bay. A new goal was formulated to lengthen the Holocene record for Missisquoi Bay (MSB) and Saint Albans Bay (SAB) in order to compare paleorecords and capture the span of time leading up to this highly productive event, possibly related to the Champlain Sea/Lake Champlain Transition (~10,000 yBP). One sediment core was taken from each bay as close to the original coordinates as the sediment cores obtained in previous studies (Koff, 2011; Palmer, 2012). The sediment cores were processed in the lab and sediment samples were tested for water content (WC), %C, %N, C:N, and diatom content. Each bay's sediment record consisted of a distinct marker representing lowest water level, separating a Champlain Sea unit at the bottom and an overlying Lake Champlain unit. A warming climate coupled with low lake level during this time may be the cause of the increase of productivity (%C) associated with the markers in both bays. Between ~8,600 - 9,400 yBP, a distinct marker represented evidence of a wetland in Saint Albans Bay before the onset of Lake Champlain. Diatom content in the wetland sediments indicated a generally shallow oligotrophic and alkaline body of water that shifted back and forth from brackish to freshwater. The record shows the wetland was eventually drowned as water level continued to rise, slowly transitioning into the Lake Champlain unit. Proxy results showed that internal processes within the lake continued to change in response to climatic and environmental drivers until present day conditions were reached. At ~9,400 yBP in Missisquoi Bay, there is an erosional unconformity between the Champlain Sea and Lake Champlain units, which corresponds to the low water levels also inferred from the SAB record during that time. After this unconformity, %C results show production within MSB fluctuated, similar to SAB, in response to changing climate and water levels until the present-day conditions of Lake Champlain were established. In sum, MSB and SAB each contain evidence of an ancient shoreline marker in different forms. Both markers indicate that lowest water levels occurred ~9,400 yBP and that lake level has risen ~7 - 8.5 meters since that time. The rise in lake level is associated with the transition into Lake Champlain. This Champlain Sea/Lake Champlain Transition lasted from ~9,400 yBP until ~8,600 yBP. Therefore, the oldest Lake sediment in the Northeast Arm of Lake Champlain is only 8,600 yBP.

Author : Tom Manley
Publisher : Springer Science & Business Media
ISBN 13 : 1475740808
Total Pages : 424 pages
Book Rating : 4.06/5 ( download)

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Download or read book Lake Champlain: Partnerships and Research in the New Millennium written by Tom Manley and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph presents the proceedings of the 2002 Spring Symposium sponsored by the Lake Champlain Research Consortium, hosted by the Missisquoi Bay Watershed Corporation. The book examines this common body of water shared by Canada and the US, and summarizes knowledge of the dynamics of this system with a primary focus on land use, water management, and bridging the gap between researchers and the public.

Author : Andrew Nicholas Robinson
Publisher :
ISBN 13 : 9781267731715
Total Pages : 39 pages
Book Rating : 4.10/5 ( download)

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Download or read book Lifting the Champlain Sea written by Andrew Nicholas Robinson and published by . This book was released on 2012 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Between about 9 and 13 ky bp, the isostatically depressed area of the Champlain, Ottawa and St Lawrence valleys were engulfed by the Atlantic Ocean. The resulting Champlain Sea had two distinct sources of water: fresh water sourced from large proglacial lakes fed by the collapsing Laurentide Ice Sheet and North Atlantic marine waters sourced via the contemporaneous eustatic rise. This study focuses on the most recent transition from the Champlain Sea (CS) to modern Lake Champlain when the fluxes between the two water sources were in a state of transition. Carbonate-associated sulfate (CAS) offers proxy evidence for the [delta] 34 S of ancient waters, a key piece in our interpretation of both flux dynamics and primary redox conditions within the basin. Previous research into CAS has shown that sulfate can be structurally substituted into authigenic and biogenic carbonates. Following wide ranging efforts to calibrate and validate this proxy, it has been demonstrated that the isotopic composition commonly reflects the ambient waters at the time of carbonate precipitation. Because of relatively low rates of bacterial sulfate reduction, the [delta] 34 S of CAS in the restricted CS can be used to approximate salinity relationships over the interval of interest. These data suggest the Champlain Sea was subject to four flood events from Lake Agassiz dropping salinity (measured in Practical Salinity Units) throughout the lifetime of the marine incursion. Splits taken from the CAS solution yield Mg, Fe, & Sr concentrations; unique to each water source, these data reflect the marine to lacustrine change in aqueous metals and identify the source of the proglacial flood source as Lake Agassiz. Due to the low concentrations of both CAS and calcium carbonate in our samples, we are in a unique position to assess the lower limits of the CAS proxys utility in studies of marine to lacustrine transitions. By capturing the transition from the Champlain Sea to Lake Champlain I detail the dynamics of this evolution as both unrelenting isostatic rebounding and diminishing flood sizes repeatedly lowered the salinity (PSU) of the CS. Moreover, low pyrite and iron monosulfide concentrations within the sediments reveal that aqueous sulfate must have been delivered back into the North Atlantic.

Author :
Publisher :
ISBN 13 :
Total Pages : 272 pages
Book Rating : 4.43/5 ( download)

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Download or read book Deposition of Air Pollutants to the Great Waters written by and published by . This book was released on 2000 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Arthur Coleman Comey
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.51/5 ( download)

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Download or read book Transition Zoning written by Arthur Coleman Comey and published by . This book was released on 1933 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Persistent memories of his earlier life compel 15-year-old Tanial to flee from his Abnaki Indian captors and journey during the winter from the northern shores of Lake Champlain to the English settlements.

Author : Mike Winslow
Publisher :
ISBN 13 : 9781884592515
Total Pages : 0 pages
Book Rating : 4.11/5 ( download)

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Download or read book Lake Champlain written by Mike Winslow and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An engaging introduction to Lake Champlain s varied physical and biological resources in short essays that offer enough detail to satisfy ecologists, but a prose style that anyone can enjoy. Six sections: The Setting; Forces; Phenomena; Living Lake: Plants; Living Lake: Animals; The Future of Lake Champlain. Copublished with The Lake Champlain Committee, a non-profit environmental organization that has been working since 1963 to protect the lake's environmental integrity and recreational resources. Author Mike Winslow, Staff Scientist for the LCC since 2001, has a BA in Biology and Environmental Studies from St. Lawrence University and an MA in Botany from the University of Vermont.

Author : Lake Champlain Basin Study (U.S.).
Publisher :
ISBN 13 :
Total Pages : 208 pages
Book Rating : 4.97/5 ( download)

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Download or read book Shaping the Future of Lake Champlain written by Lake Champlain Basin Study (U.S.). and published by . This book was released on 1979 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author :
Publisher :
ISBN 13 :
Total Pages : 678 pages
Book Rating : 4.52/5 ( download)

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Download or read book Bulletin written by and published by . This book was released on 1902 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt: