Principles of Lake Sedimentology

Håkanson, Lars; Jansson, Mats

doi:10.1007/978-3-642-69274-1

Cited by 1,101 publications

(840 citation statements)

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“…Samples were transported to the laboratory and oven-dried (70ºC for 72 hours). Grain size composition of the different samples was analysed following the protocols of Hakanson & Jansson (1983) and Tucker (1988). In short, two sub-samples of 50 g were treated with 250 ml of NaOH (0.2 mol/l) and stirred for 5 minutes.…”

Section: Shrimp Collection and Transect Descriptionmentioning

confidence: 99%

Spatial and temporal distribution of the shrimp Nematopalaemon schmitti (Decapoda: Caridea: Palaemonidae) at a subtropical enclosed bay in South America

et al. 2009

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The spatio-temporal distribution of the soft bottom dwelling shrimp Nematopalaemon schmitti and the effect of environmental conditions (sediment characteristics, temperature, salinity and dissolved oxygen) on its abundance were studied at Ubatuba Bay, south-eastern coast of Brazil. Surveys were conducted monthly from September 1995 to August 1996. Each sampling set comprised eight different transects distributed within the bay. Comparisons of CPUE of shrimp among sampling stations demonstrated that the abundance of N. schmitti was the greatest during winter, when average water temperature within the bay was considerably lower than during the rest of the year. Most shrimps (more than 95%) were collected at a single transect located at the northernmost side of the bay, demonstrating the extremely patchy distribution of this species. A multiple regression analysis using data only from this northernmost transect indicated that temperature was the most relevant factor affecting the abundance of N. schmitti during the year.

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Section: Shrimp Collection and Transect Descriptionmentioning

confidence: 99%

Spatial and temporal distribution of the shrimp Nematopalaemon schmitti (Decapoda: Caridea: Palaemonidae) at a subtropical enclosed bay in South America

et al. 2009

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“…The cores were dated by 210 Pb (decay curve) and 137 Cs (1963 bomb fallout and 1986 Chernobyl catastrophe) measured in freeze-dried slices using a Ge-Li borehole detector [Hakanson and Jansson, 1983]. As shown below, sedimentation at location F includes primarily matter from summer (referring to months between April and October) because of its shallow depth, whereas location G is subjected to sedimentation throughout the year (due to its great depth).…”

Section: Particle Distributions In Downstream Lake Brienzmentioning

confidence: 99%

Effects of upstream hydropower operation on riverine particle transport and turbidity in downstream lakes

Finger

Schmid

Wüest

2006

Water Resources Research

131

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[1] Retention in upstream storage dams results in modified riverine water and particle discharge patterns. Particularly, suspended solids input and intrusion dynamics in downstream lakes are affected by dam operations. In a case study, size-dependent particle budgets for peri-alpine Lake Brienz (Switzerland), downstream of major hydropower installations, were determined for a recent 8-year period (1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)) and compared to hypothetical no-dam scenarios based on numerical simulations. For this purpose, current tributary particle loads, as well as lake-internal sedimentation and turbidity dynamics, were assessed with in situ measurements. The analysis shows that hydropower damming drastically diminishes particle fluxes and minimizes (short-term) peak discharges. Reductions of high-flow events substantially cut the number of deep intrusions increasing particle supply to the lake surface layer. Furthermore, these hydropower operations shift particle inputs from summer to winter. As a consequence, such peri-alpine lakes become more turbid during winter and less turbid during summer, influencing the seasonal light regime and subsequently the dynamics of phytoplankton growth.

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“…The dried sediment was heated at 550°C for 1 h in order to determine the organic matter (Golterman et al, 1983;Hakanson and Jansson, 1983). Silt and clay analyses of sediment samples were done by pipette analyses (Carver, 1971).…”

Section: Analytical Proceduresmentioning

confidence: 99%

Screening 31 endocrine-disrupting pesticides in water and surface sediment samples from Beijing Guanting reservoir

2005

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For screening 31 potential or suspected endocrine-disrupting pesticides in water and surface sediments, a multiresidue analysis method based on gas chromatography with electron capture detection (GC/ECD) was developed. Solid phase extraction (SPE) technology with Oasis Ò HLB cartridge was also applied in sample extraction. The relevant mean recoveries were 70-103% and 71-103% for water and sediment, respectively. Relative standard deviations (RSD) are 2.0-7.0%, 4.0-8.0% for water and sediment, respectively. Thirty one pesticides (a-HCH, b-HCH, c-HCH, d-HCH, hexachlorobenzene (HCB), aldrin, heptachlor, endosulfan I & II, p,p 0 -DDD, o,p 0 -DDT, p,p 0 -DDT, p,p 0 -DDE, endrin aldehyde, endosulfan sulphate, methoxychlor, hepachlor epoxide, a-chlordane, c-chlordane, dieldrin, endrin, dicofol, acetochlor, alachlor, metolachlor, chlorpyriphos, nitrofen, trifluralin, cypermethrin, fenvalerate, deltamethrin) in water and surface sediment samples from Beijing Guanting reservoir were analyzed. Concentrations of pesticides ranged from 7.59 to 36.0 ng g À1 on a dry wt. basis for sediment samples, from 279.3 to 2740 ng l À1 for pore waters and from 48.8 to 890 ng l À1 for water samples, respectively, with a mean concentration of 10.7 ng g À1 in sediment, 735 ng l À1 in pore water and 295 ng l À1 in water, respectively. The data obtained provides information on the levels and sources of endocrine-disrupting pesticides in Guanting reservoir. These results underscore the need to improved environmental protection measures in order to reduce the exposure of the population and aquatic biota to these endocrine-disrupting compounds.

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Principles of Lake Sedimentology

Cited by 1,101 publications

References 0 publications

Spatial and temporal distribution of the shrimp Nematopalaemon schmitti (Decapoda: Caridea: Palaemonidae) at a subtropical enclosed bay in South America

Spatial and temporal distribution of the shrimp Nematopalaemon schmitti (Decapoda: Caridea: Palaemonidae) at a subtropical enclosed bay in South America

Effects of upstream hydropower operation on riverine particle transport and turbidity in downstream lakes

Screening 31 endocrine-disrupting pesticides in water and surface sediment samples from Beijing Guanting reservoir

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