Sediment Core Collection and Extrusion

Glew, John R.; Smol, John P.

doi:10.1007/0-306-47669-x_5

Cited by 166 publications

(135 citation statements)

References 58 publications

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“…Over the period of the monitoring record, a significant increase in chlorophyll a has been observed that cannot be explained by an increase in TP (figure 2a) [11]. A surface-sediment core was obtained from the deepest basin of Lake George in July 2005 using a Glew gravity corer with an internal diameter of 7.6 cm equipped with a 50 cm long Lexan core tube [18,19]. The core was sectioned into 0.5 cm intervals using a Glew vertical extruder [20], and then transferred to individual Whirl-Pak sample bags, and stored at 48C at the Paleoecological Environmental Ministry of the Environment's Lake Partner Programme and analysed for Ca at the Dorset Environmental Science Centre (Dorset, Ontario).…”

Section: Methodsmentioning

confidence: 99%

Anomalous rise in algal production linked to lakewater calcium decline through food web interactions

et al. 2011

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Increased algal blooms are a threat to aquatic ecosystems worldwide, although the combined effects of multiple stressors make it difficult to determine the underlying causes. We explore whether changes in trophic interactions in response to declining calcium (Ca) concentrations, a water quality issue only recently recognized in Europe and North America, can be linked with unexplained bloom production. Using a palaeolimnological approach analysing the remains of Cladocera (herbivorous grazers) and visual reflectance spectroscopically inferred chlorophyll a from the sediments of a Nova Scotia (Canada) lake, we show that a keystone grazer, Daphnia, declined in the early 1990s and was replaced by a less effective grazer, Bosmina, while inferred chlorophyll a levels tripled at constant total phosphorus (TP) concentrations. The decline in Daphnia cannot be attributed to changes in pH, thermal stratification or predation, but instead is linked to declining lakewater [Ca]. The consistency in the timing of changes in Daphnia and inferred chlorophyll a suggests top-down control on algal production, providing, to our knowledge, the first evidence of a link between lakewater [Ca] decline and elevated algal production mediated through the effects of [Ca] decline on Daphnia.[Ca] decline has severe implications for whole-lake food webs, and presents yet another mechanism for potential increases in algal blooms.

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Section: Methodsmentioning

confidence: 99%

Anomalous rise in algal production linked to lakewater calcium decline through food web interactions

et al. 2011

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“…High-resolution sediment cores, using equipment specifically designed to collect surface sediments (Glew et al 2001), were recovered during July 2005 using plexiglass tubes that were pushed directly into the sediments. Cores were sectioned on-site in continuous 0.5 cm intervals using a close-interval extruder (Glew et al 2001).…”

Section: Methodsmentioning

confidence: 99%

“…Cores were sectioned on-site in continuous 0.5 cm intervals using a close-interval extruder (Glew et al 2001). Geochronology is based primarily on 137 Cs dating (Michelutti et al 2008).…”

Section: Methodsmentioning

confidence: 99%

Seabird-driven shifts in Arctic pond ecosystems

et al. 2008

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Migratory animals such as seabirds, salmon and whales can transport large quantities of nutrients across ecosystem boundaries, greatly enriching recipient food webs. As many of these animals biomagnify contaminants, they can also focus pollutants at toxic levels. Seabirds arguably represent the most significant biovectors of nutrients and contaminants from the ocean to the land, given their sheer numbers and global distribution. However, long-term census data on seabirds are rare. Using palaeolimnological proxies, we show that a colony of Arctic seabirds has experienced climate-induced population increases in recent decades. We then document increasing concentrations of contaminants, including polychlorinated biphenyls and cadmium, in pond sediments that are linked to biotransport by seabirds. Our findings suggest that climate-related shifts in global seabird populations will have the unexpected consequence of restructuring coastal ecosystems.

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“…This sampling method and density were selected in order to capture all the lake's major sub-basins, ridges and sills. Sediment coring was carried out during the summer of 2002 using a messenger-operated Kajak-Brinkhurst gravity sampler (Glew et al, 2001) with an inner core diameter of 7·6 cm. The cores were split vertically and digitally photographed within 24 hours after recovery.…”

Section: Methodsmentioning

confidence: 99%

Contemporary sedimentation rates and depositional structures in a montane lake basin, southern Coast Mountains, British Columbia, Canada

Schiefer

2006

Earth Surf Processes Landf

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Spatial variability of recent lacustrine sedimentary structures and sedimentation rates are examined for Green Lake, a morphologically complex lake basin of the southern Coast Mountains, British Columbia. A dense, 100 m grid sampling scheme was used for sediment coring within the 2 km 2 lake basin. Deltaic, massive, weakly laminated, and varved sediment sequences are identified within the sediment record. Spatial patterns among these sedimentary deposits are related to within-lake sediment transfer processes, morphometric controls, and the extent of post-depositional mixing by bioturbation. Unconformities, turbidites, and cohesive slump failure deposits, observed within the contemporary varve sequences, could all be correlated with major flooding events in the catchment area and direct anthropogenic disturbances along the shoreline. There is an overall, non-linear decrease in sedimentation rates with increasing distance from the lake inflows; however, this pattern is disrupted in deep water sites of intervening lake sub-basins where locally higher accumulation rates are observed. Spatial sedimentation patterns are quantitatively described by an empiricallyderived model. Systematic variations in the model parameters are observed for different lake sub-regions and are associated with changing sediment transfer dynamics between proximal and distal sub-basin settings.

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Sediment Core Collection and Extrusion

Cited by 166 publications

References 58 publications

Anomalous rise in algal production linked to lakewater calcium decline through food web interactions

Anomalous rise in algal production linked to lakewater calcium decline through food web interactions

Seabird-driven shifts in Arctic pond ecosystems

Contemporary sedimentation rates and depositional structures in a montane lake basin, southern Coast Mountains, British Columbia, Canada

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