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152 results for “lake sediment”
Utah Lake Sediment Core Data
<p>Files contain data collected from sediment core archives from 4 locations of Utah Lake, Utah.</p> <p>Core locations include Goshen Bay, Provo Bay, Bird Island, and North. Provo Bay cores were collected in both 2018, but due to poor chronology new cores were collected at an alternate location in 2020. The 2020 Provo Bay cores had satisfactory chronologies. </p> <p>Data include initial core descriptions (ICD), carbon and nitrogen mass and isotopes, geochemistry, diatom, pigments, and rock-eval pyrolysis. </p> <p>Publications (Journal articles, theses, and white papers) include all methods, data, and interpretations and should be cited along side the Zenodo data citation. </p>
FIGURE 2 in Sub-fossil Chironomidae (Diptera) from lake sediments in Central America: a preliminary inventory
FIGURE 2. Elevational distribution of the proportion of chironomid subfamilies Tanypodinae, Chironominae and Orthocladiinae on the total chironomid abundance (a, c, e) and taxonomic richness (b, d, f). P values are as follows a) p=0.61, b) p=0.36, c) p=0.007, d) p=0.009, e) p=0.0001, f) p=0.000004.
FIGURE 1 in Sub-fossil Chironomidae (Diptera) from lake sediments in Central America: a preliminary inventory
FIGURE 1. Distribution of the surveyed lakes in Central America. Number (ID) indicates given lakes: 1. Sacnab; 2. Salpetén; 3. Las Pozas; 4. Lachuá; 5. Magdalena; 6. Chicabal; 7. Atitlán; 8. Calderas; 9. El Pino; 10. Ipala; 11. Comandador; 12. El Muchacho; 13. Grande; 14. Ticamaya; 15. Jucutuma; 16. Yojoa; 17. Chiligatoro; 18. Madre Vieja; 19. Metapan; 20. El Espino; 21. Verde; 22. Chanmico; 23. Apastepeque; 24. Aramuaca; 25. Jocotal; 26. Olomega; 27. Los Negritos.
Supplementary data set for Environmental DNA in lake sediment reveals biogeography of native diversity
<p>Illumina miseq data in geneious format.</p>
FIGURES 34–39 in Cyclotella petenensis and Cyclotella cassandrae, two new fossil diatoms from Pleistocene sediments of Lake Petén-Itzá, Guatemala, Central America
FIGURES 34–39. Type material of fossil lacustrine diatom Cyclotella cassandrae from lake Peten Itza, SEM. (34) Internal view of the valve margin along the major axis, MFP consisting of a short tube surrounded by three cowlings and located just at the tip of the costa below the marginal lamina. (35) Internal view of the valve margin along the minor axis where MFP are rather embedded in the costae at some distance of the marginal lamina and with triangular-shaped inserted costae. (36) Oblique internal view of a broken valve showing MFP on nearly each costae, a single short costa-born RM and CFP consisting of a tube with two to three cowlings scattered indifferently on the convex and concave part of the central area. (37) Born on a costa, a detailed view of the RM consisting of a shortly stalked labium with a radially orientated slit. (38) External view of a complete corroded frustule where the two valves are attached by an open valvocopula (black arrowhead) and fragments of collapsed and eroded girdle bands. (39) Internal view of a valve with a large fragment of a stepped valvocopula, a broken RM (black arrowhead) and CFP consisting of one tube with two or three cowlings. Scale = 10μm (38–39), 2μm (36), 1μm (34–35), 500 nm (37). Abbreviations: central fultoportulae (CFP), marginal fultoportulae (MFP), rimoportula (RM).
FIGURES 23–27 in Cyclotella petenensis and Cyclotella cassandrae, two new fossil diatoms from Pleistocene sediments of Lake Petén-Itzá, Guatemala, Central America
FIGURES 23–27. Type material of fossil lacustrine diatom Cyclotella cassandrae from lake Peten Itza, LM. (23–24) Valve view at two different focus showing the elliptic shape of the valve, the slightly tangentially undulated central area with scattered puncta, short striae along the major axis, longer and apart striae along the minor axis and at some distance of the valve margin the external opening of MFP (black arrowheads). (25). Valve view with dichotomous striae along the minor axis. (26–27). Size variation of C. cassandrae: large specimen with dichotomous striae and a central area occupied by a scattered ring of puncta, some specimen are more rounded but still elliptic. Scale = 10μm. Abbreviation: central fultoportulae (CFP), marginal fultoportulae (MFP), rimoportula (RM).
FIGURES 17‒22 in Cyclotella petenensis and Cyclotella cassandrae, two new fossil diatoms from Pleistocene sediments of Lake Petén-Itzá, Guatemala, Central America
FIGURES 17‒22. Type material of fossil lacustrine diatom Cyclotella petenensis from lake Peten Itza, SEM. (17) Internal view of the valve showing near the margins partially occluded alveoli by the central lamina, an arc of CFP (white arrowheads) consisting of one tube surrounded by three satellite pori in the central area and a single sessile RM (white double arrowhead) opposite to the arc. (18) Internal detailed view of the valve margin with MFP located on each costae and a stalked rimoportula with slightly deflected labium. (19) Internal view of costae-born MFP consisting of a tube surrounded by three satellite pores and the protruding RM with an oblique slit. (20) External view of the external openings of marginal fultoportula (white arrowhead) consisting of very short tubes separated by rows of very fine areolae and granules. (21) Detailed view of a broken valve margin showing a narrow canal connecting internal MFP to their external opening. (22) External view of two valves connected by a cingulum consisting of an open valvocopula (white arrowhead) and several copulae. Scale = 10μm (17, 22), 2μm (18–21). Abbreviations: central fultoportulae (CFP), marginal fultoportulae (MFP), rimoportula (RM).
FIGURES 1‒9 in Cyclotella petenensis and Cyclotella cassandrae, two new fossil diatoms from Pleistocene sediments of Lake Petén-Itzá, Guatemala, Central America
FIGURES 1‒9. Type material of fossil lacustrine diatom Cyclotella petenensis from lake Peten Itza, LM. (1‒2) Valve view at two different focus showing striae and marginal alveoli representing the 'shadow line' and the tangentially undulated central area with CFP in an arc. (3–9) Size variation of C. petenensis with variable number of CFP related to valve diameter. (4) taken from holotype permanent slide PC0612192. Scale bar = 10μm. Abbreviations. central fultoportulae (CFP).
FIGURES 11‒16 in Cyclotella petenensis and Cyclotella cassandrae, two new fossil diatoms from Pleistocene sediments of Lake Petén-Itzá, Guatemala, Central America
FIGURES 11‒16. Type material of fossil lacustrine diatom Cyclotella petenensis from lake Peten Itza, SEM. (11) External view of the valve face with a small central area and CFP positionned in an arc (white arrowheads), striae crossed by a 'shadow line' corresponding to the centripetal occlusion of the alveoli by the central lamina. (12) Oblique view of the valve showing two bands of the cingulum (white arrow). (13) Eroded part of the marginal area showing the limit between the central lamina and alveoli openings, erected ribs (costae) covered by the perforated silica layer with large areolae near the central area. (14) Side view of the valve with a gently sloping mantle, the dashed lines represent the interstriae/costae in depressions whereas the mid-part of striae is slightly elevated. (15) Details of striation near the valve margin (white arrows and dashed lines delineated the ribs), each striae being formed by two lateral rows of areolae separated by a narrow row of very fine areolae. (16) Detailed view of striation (dashed lines delineated the ribs): near the valve centre above the ribs rows of four to five large areolae separated by hyaline strips perforated by very fine areolae, on the valve face the rows of large areolae dividing up in two rows of smaller areolae arranged in quiqunx, the striae (between dashed lines) formed by two lateral rows of medium sized areolae separated by a finely perforated hyaline strip. Halfway the mantle the external openings of MFP (white arrowhead) and a larger rounded opening (double white arrowhead) representing the external expression of the RM slightly above the ring of MFP. Below the ring of external openings (MFP and RM) four to five rows of granules up to the valve margin. Scale = 10μm (11 ‒12), 5μm (14), 2μm (13, 15–16). Abbreviations. central fultoportulae (CFP), marginal fultoportulae (MFP), rimoportula (RM).
Data from: Lake sediment multi-taxon DNA from North Greenland records early post-glacial appearance of vascular plants and accurately tracks environmental changes
High Arctic environments are particularly sensitive to climate changes, but retrieval of paleoecological data is challenging due to low productivity and biomass. At the same time, Arctic soils and sediments have proven exceptional for long-term DNA preservation due to their constantly low temperatures. Lake sediments contain DNA paleorecords of the surrounding ecosystems and can be used to retrieve a variety of organismal groups from a single sample. In this study, we analyzed vascular plant, bryophyte, algal (in particular diatom) and copepod DNA retrieved from a sediment core spanning the Holocene, taken from Bliss Lake on the northernmost coast of Greenland. A previous multi-proxy study including microscopic diatom analyses showed that this lake experienced changes between marine and lacustrine conditions. We inferred the same environmental changes from algal DNA preserved in the sediment core. Our DNA record was stratigraphically coherent, with no indication of leaching between layers, and our cross-taxon comparisons were in accordance with previously inferred local ecosystem changes. Authentic ancient plant DNA was retrieved from nearly all layers, both from the marine and the limnic phases, and distinct temporal changes in plant presence were recovered. The plant DNA was mostly in agreement with expected vegetation history, but very early occurrences of vascular plants, including the woody Empetrum nigrum, document terrestrial vegetation very shortly after glacial retreat. Our study shows that multi-taxon metabarcoding of sedimentary ancient DNA from lake cores is a valuable tool both for terrestrial and aquatic paleoecology, even in low-productivity ecosystems such as the High Arctic.
Enhancing ecological integrity while preserving ecosystem services: constructing soft-sediment islands in a shallow lake
<p>1. Ecosystems are increasingly managed to provide multiple benefits to humans, which often degrades their ecological integrity. This strongly applies to aquatic ecosystems, in which engineering can enhance flood protection, drinking water supply, fisheries and recreation. Although these activities typically increase ecosystem functionality to humans, they often impair key aspects of biodiversity and natural functioning.</p> <p>2. Classical restoration of such degrading freshwater ecosystems can lead to societal opposition, if returning to a former ecosystem state affects previously acquired ecosystem services. Innovative nature-based solutions are therefore needed that enhance natural values in ecosystems, without affecting existing services.</p> <p>3. We present a large-scale project aiming to increase the ecological integrity of a human-modified freshwater lake, while maintaining its services to humans. The freshwater lake Markermeer in the Netherlands was formed by closing off an estuary for flood protection. The ecological integrity of this lake diminished over time, likely because a declining primary productivity impaired biodiversity at higher trophic levels. This decline is associated with a lack of gradual land-water transitions, strong resuspension of fine sediments, a low nutrient availability and lack of dynamics typically to be expected in a natural temperate freshwater lake. Restoring the lake to its former marine state would conflict with current ecosystem services.</p> <p>4. A nature-based solution was initiated in 2016, consisting of constructing a five-island archipelago from the lake's own soft-sediments called the "Marker Wadden". The project aims to increase the lake's primary production by creating gradual land-water transitions, more heterogeneity in water depths, and decreasing turbidity by creating shelter and deep sinks reducing fine-sediment resuspension by wind – thus introducing currently missing elements that are typical for natural lakes. We present the underlying ecological framework and first scientific results of this innovative on-going project.</p> <p>5. Within four years, the Marker Wadden project shows how forward-looking sustainable development of lake ecosystems using a rewilding approach can enhance natural processes and attract birds and fish, without conflicting with existing ecosystem services. This inspires new directions for halting and reversing the degradation of other vital ecosystems worldwide.</p>
A framework for 210Pb model selection and its application to 37 cores from Eastern Canada to identify the dynamics and drivers of lake sedimentation rates
<ul> <li>Radioisotopic and ancillary data (i.e., estimated temperature, precipitation and population in lake watersheds)</li> <li>R-code script used in the establishment of 210Pb framework along with example spreadsheet</li> </ul> <p>Original publication: Baud, A., Aulard, C., Ghanbari, H., Fradette, M., Antoniades, D., Del Giorgio, P., Huot, Y., Francus, P., Smol, J. & Gregory‐Eaves, I. (2022). A framework for 210Pb model selection and its application to 37 cores from Eastern Canada to identify the dynamics and drivers of lake sedimentation rates. Earth Surface Processes and Landforms. https:</p>
Data to reproduce the results presented in Lake et al. 2023. Science of The Total Environment, https://doi.org/10.1016/j.scitotenv.2023.162332 ("Use of a submersible spectrophotometer probe to fingerprint spatial suspended sediment sources at catchment scale")
<p>This repository contains the absorbance data measured on the water samples collected in all sampling sites, for the three campaigns, as described in Lake et al., 2023. </p> <p>Data consists of:</p> <p>- Absorbance data compensated for measured concentration and compensated for absorbance measured on filtered water </p> <p>- Absorbance data compensated for measured concentration</p> <p>Shown files are the input files for the MixSIAR modelling exercise as described in Lake et al., 2023.</p>
Data from: Lake sediment multi-taxon DNA from North Greenland records early post-glacial appearance of vascular plants and accurately tracks environmental changes
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Enhancing ecological integrity while preserving ecosystem services: constructing soft-sediment islands in a shallow lake
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Data from: Reconstructing long-term human impacts on plant communities: an ecological approach based on lake sediment DNA
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Data from: Tracking the history and ecological changes of rising double-crested cormorant populations using pond sediments from islands in eastern Lake Ontario
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Data from: Molecular profiling of diatom assemblages in tropical lake sediments using taxon-specific PCR and Denaturing High-Performance Liquid Chromatography (PCR-DHPLC)
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Data from: Molecular and pollen-based vegetation analysis in lake sediments from central Scandinavia
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Data from: Plant DNA metabarcoding of lake sediments: how does it represent the contemporary vegetation
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