scholarly journals Physicochemical and analytical data for tributary water, lake water, and lake sediment, Lake Arrowhead, Clay and Archer Counties, Texas, 2006

Data Series ◽  
10.3133/ds334 ◽  
2008 ◽  
Author(s):  
Jennifer T. Wilson ◽  
MaryLynn Musgrove ◽  
Monti M. Haynie ◽  
Peter C. Van Metre
Keyword(s):  
Lake Sediment ◽  
Lake Water ◽  
Analytical Data ◽  
Water Lake

Characterization of the light field in laboratory scale enclosures of eutrophic lake water (Lake Loosdrecht, The Netherlands)

Hydrobiologia ◽  
1992 ◽  
Vol 238 (1) ◽  
pp. 99-109 ◽  
Author(s):  
Herman J. Gons ◽  
Jacco Kromkamp ◽  
Machteld Rijkeboer ◽  
Oscar Schofield
Keyword(s):  
The Netherlands ◽  
Lake Water ◽  
Light Field ◽  
Eutrophic Lake ◽  
Laboratory Scale ◽  
Water Lake ◽  
Eutrophic Lake Water

Reconstructing past lake water total phosphorus concentration using sediment geochemical records

2020 ◽  
Author(s):  
Madeleine Moyle ◽  
John Boyle ◽  
Richard Chiverrell
Keyword(s):  
Lake Sediment ◽  
Lake Water ◽  
Critical Evaluation ◽  
Future Climate Change ◽  
Phosphorus Concentration ◽  
General Applicability ◽  
Total Phosphorus Concentration ◽  
Site Specific ◽  
Geochemical Method ◽  
P Cycle

<p>To understand current phosphorus (P) cycling, which encompasses disturbances caused by human activity, it is necessary to quantify the long-term natural P cycles on which modern drivers act. The shortness of monitored P records renders this difficult by only covering the post-disturbance period and therefore fail to capture pre-disturbance baselines. Target driven management of sensitive ecosystems suffering from eutrophication uses baselines for P that cannot be reliably quantified at present. Recovery will only be possible if P loadings can be brought under control and this requires an understanding of what water quality targets are both desirable and achievable on a site-specific basis. This matters because a well-functioning ecosystem will be more resilient under future climate change and increasing human pressure on the landscape.</p><p>Where lakes are present in the landscape, there is the opportunity to use the sediment archive to provide long records of past P concentration.  At present, these reconstructions rely on diatoms or related microfossil indicators. These require time and resource intensive tailored training sets and furthermore the records do not preserve in all lakes. Here we present a novel geochemical method for reconstructing water P concentrations based on lake sediment P burial fluxes, which in principle is universally applicable.</p><p>Tested at six published lake sites, the method produces results that agree very well with overlapping monitoring data for those lakes (r<sup>2 </sup>= 0.8). We want to share our method with the research community to identify additional sites to further verify the general applicability.</p><p>To illustrate the value of this approach to site-specific management, we compare past lake water total P reconstructions at Crosemere (UK) with a record of Holocene land cover change to identify the drivers of acceleration in the P cycle. Wider application of this lake sediment geochemical method will allow more critical evaluation of the human and natural drivers of the P cycle and be of benefit to ‘systems understanding’ spanning terrestrial and aquatic ecosystems.</p>

Carbon Isotope Composition of Lake Sediments in Relation to Lake Productivity and Radiocarbon Dating

1992 ◽  
Vol 37 (3) ◽  
pp. 333-345 ◽  
Author(s):  
Ramon Aravena ◽  
Barry G. Warner ◽  
Glen M. MacDonald ◽  
Karen I. Hanf
Keyword(s):  
Lake Sediments ◽  
Lake Sediment ◽  
Lake Water ◽  
Dissolved Inorganic Carbon ◽  
Isotope Composition ◽  
Hard Water ◽  
Lake Basin ◽  
Lake Productivity ◽  
Radiocarbon Dates ◽  
Organic Sediment

AbstractCarbon-13 profiles and radiocarbon dates were obtained from two Canadian kettle basins having similar geological and hydrological characteristics to develop criteria for evaluating the validity of radiocarbon dates on lake sediment from basins in calcareous terrain. Radiocarbon dates from a site in Alberta show a variable hard-water effect related to local hydrological changes during postglacial history of the lake basin, whereas radiocarbon dates from the other site in Ontario show no noticeable influence of old carbon during its history. These differences are mainly related to lake water residence time, which has influenced carbon isotopic exchange between atmospheric CO2 and dissolved inorganic carbon in lake water. δ13C values for bulk organic sediment and terrestrial and aquatic macrofossils reveal that the main component of lake sediment at both sites is autocthonous in origin. Furthermore, each site supported different submerged aquatic plant communities that used different sources of carbon for photosynthesis, thereby imprinting the organic sediments with a characteristic 13C composition. Both sites reflect a clear relationship between 13C values and paleoproductivity. This study shows the individualistic response of the developing lake system to the hydrology, lake biota, and local geology, and demonstrates the problem of using 13C in lake sediments as a single criterion to recognize the validity of radiocarbon dates of lake sediment without supporting paleoecological information.

scholarly journals Installation of an Artificial Vegetating Island in Oligomesotrophic Lake Paro, Korea

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Eun-Young Seo ◽  
Oh-Byung Kwon ◽  
Seung-Ik Choi ◽  
Ji-Ho Kim ◽  
Tae-Seok Ahn
Keyword(s):  
Energy Source ◽  
Lake Water ◽  
Littoral Zone ◽  
Bacterial Attachment ◽  
Iris Ensata ◽  
Total Phosphate ◽  
Water Lake ◽  
Important Region ◽  
Artificial Vegetation ◽  
Inflowing Water

After cut off of inflowing water, Lake Paro, an oligomesotrophic lake lost littoral zone, an important region for the aquatic ecosystem. For the first step of restoration, the artificial vegetation island was installed. The concentration of nutrients in lake water was not sufficient for the growth of macrophyte as total phosphate was ranged from 58 to 83 μg L−1. In order to overcome this problem, the hydrophobic substratum for bacterial attachment was selected as buoyant mat material of the artificial vegetation island. In this medium, total phosphate and total nitrogen were ranged from 190 to 1,060 μg L−1and from 4.9 to 9.1 mg L−1, respectively. These concentrations were high enough for macrophytes growth. After launching 1,800 m2of AVI in Lake Paro, the macrophytes,Iris pseudoacorusandIris ensata, grew well after five years of launching without the addition of fertilizer. Furthermore, fishes were plentiful under the artificial vegetation island, and ducks were observed on the artificial vegetation island. Bacteria using sunlight as energy source and self-designed ecotechnology can be used as an alternative method for the restoration of disturbed littoral zone in oligo-mesotrophic lakes.

scholarly journals Water Temperature Increasing Caused Mastigias Papua Disappeared in Marine Lake Lenmakana Misool Raja Ampat Regency, West Papua

2020 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Gandi YS Purba
Keyword(s):  
Water Temperature ◽  
Lake Water ◽  
Rainy Season ◽  
Secondary Data ◽  
The West ◽  
Tourist Destinations ◽  
Water Lake ◽  
Marine Lakes ◽  
Lake Temperature ◽  
West Monsoon

Mastigias papua is a jellyfish that is trademark of marine lakes. Ongeim’l Tketau Lake in Palau, Hang Du I Lake in Vietnam, Kakaban Lake in Kalimantan, and Lenmakana Lake in Raja Ampat Papua are exotic tourist destinations because of presence of these biota in the lake. Water temperature is very influential on the life of a jellyfish because of its mutual symbiosis with brown algae zooxanthellae. Mastigias has totally disappeared in several places due to water temperature increasing, including Lenmakana Lake in the West Monsoon 2017/2018 and 2018/2019. The absence of Mastigias in this lake will be explained by recorded logger data installed in the lake and at sea. Secondary data from NOAA and BMKG will be used to explain the condition of absence of jellyfish. Water lake temperature data showed an increase to 2.5oC when the Mastigias disappeared. Temperature increasing occur due to seasonal cycle patterns of lake water temperatures and weather cycles which change in time, the dry season occurs faster and the rainy season occurs slower. Conversely, in the West Monsoon 2019/2020, Mastigias still found in the lake. The rainy season which is 20 days faster than normal condition helps reduce the heat in West Monsoon.

Towards a history of Holocene P dynamics for the Northern Hemisphere using lake sediment geochemical records

2021 ◽  
Author(s):  
Madeleine Moyle ◽  
John Boyle ◽  
Richard Chiverrell
Keyword(s):  
Human Impact ◽  
Lake Sediment ◽  
Northern Hemisphere ◽  
Human Activity ◽  
Lake Water ◽  
Process Model ◽  
P Cycling ◽  
History Of ◽  
P Supply

<p>Present day phosphorus (P) enrichment and accelerated P cycling are changes superimposed on a dynamic Holocene history of landscape recovery from glaciation, changes in climate, and long-term low-intensity human activity. Knowledge of the changing role of human activity in driving long-term P dynamics is essential for understanding landscape P export and managing both terrestrial and aquatic environments.</p><p>Here we apply a simple process model to published lake sediment geochemical P records from 24 sites distributed across the Northern Hemisphere, producing Holocene records of landscape P yield and reconstructions of lake water TP concentrations. These records are a first attempt to produce values for average P export for the Northern Hemisphere over the Holocene, which can be used for constraining long-term landscape P cycling models.</p><p>Individual site trajectories of reconstructed Holocene landscape P yield and lake water TP varied systematically, with differences attributable to landscape development history, in turn driven by climate, human impact and other local factors. Three distinct traits are apparent across the records. Mountain sites with minimal direct human impact show falling Holocene P supply, and conform to conceptual models of natural soil development (Trait 1). Lowland sites  where substantial (pre-)historic agriculture was present show progressively increasing Holocene P supply (Trait 2). Lowland sites may also show a rapid acceleration in P supply over the last few centuries, where high intensity land use, including settlements and farming, are present (Trait 3).</p><p>This long-term perspective is pivotal to understanding drivers of change in coupled terrestrial and aquatic P cycling. Our reconstructions of long-term lake water TP are particularly useful for target-driven management of aquatic systems.</p>

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