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28 results for “dry weight”
Plant aboveground biomass dry weight record for Space for Time plots in PIE LTER.
Aboveground biomass measurements were conducted annually near peak biomass to evaluate aboveground plant production and determine differences in relation to other biotic and abiotic factors. In a 0.053 m2 plot, aboveground biomass was clipped to the soil surface at Space For Time plots, dried, and weighed to capture dry weight.
Fall 2000 soil organic content survey -- ash-free dry weight analysis for soil samples from 10 GCE LTER sampling sites
Soil core samples were collected from the permanent plots at 10 GCE LTER sampling sites in October, 2000, to survey the fractional organic content in marsh sediments. Surveys will be conducted annually to assess changes in soil organic content in response to environmental factors documented by other GCE monitoring efforts.
Invertebrate dry weight data in various locations, mostly within the LEF at El Verde
Contains information [identity, counts, size, fresh and dry weights] of various collections of invertebrates (and the occasional amphibian or reptile), which has allowed formulae describing the relationship between length and dry wt. of invertebrates to be obtained. These have been used in estimating biomass in studies of bromeliad, heliconia and litter inveretebrates in the LEF. They will have a wider application. Support for this work was provided by grants BSR-8811902, DEB-9411973, DEB-9705814 , DEB-0080538, DEB-0218039 , DEB-0620910 , DEB-1239764, DEB-1546686, and DEB-1831952 from the National Science Foundation to the University of Puerto Rico as part of the Luquillo Long-Term Ecological Research Program. Additional support provided by the University of Puerto Rico and the International Institute of Tropical Forestry, USDA Forest Service.
Size-fractionated zooplankton dry weight collected using a 1-m diameter ring net with 200-μm mesh at Palmer Station, Antarctica during Palmer LTER field seasons, 2017-2020
Zooplankton are a morphologically and taxonomically diverse group of animals. Many zooplankton feed on phytoplankton in surface waters and thus provide a link between primary producers and higher trophic levels. The density of zooplankton dry weight for five size fractions was determined at Palmer LTER Stations B and E. Samples were collected with a 1-m diameter, 200-μm mesh ring net towed obliquely from the surface to a target depth of 50 m and back. Tows were conducted during daytime, and sampling frequency was nominally twice weekly while personnel were at Palmer Station between the months of November and March. One-half of the catch was size-fractionated with nested sieves into the following five size classes for biomass analysis: 0.2−0.5, 0.5−1, 1−2, 2−5, and >5 mm. Individual size fractions were concentrated on preweighed 200 μm mesh filters and frozen at −20°C until analysis. Samples were thawed, weighed to determine wet biomass, dried at 60°C for at least 24 h, and weighed again to determine dry biomass. Zooplankton density varies across size groups, seasonally, among years, and between sampling stations. Units of biomass density are milligrams dry weight per cubic meter.
Shell length and dry tissue weight relationship of the mollusk Ostrea lurida (Olympia Oyster) in the low and subtidal zones of the San Diego River, California: 2016-2017.
Data was collected to look at the relationship between the dry tissue weight and the shell length of Ostrea lurida in the San Diego River, and use the data to compare it to other estuaries O. lurida inhabit along the west coast of North America. Sampling was done in the low and sub intertidal zones along the delta of the San Diego River from October 2016 through September 2017. A fifty meter transect was chosen to collect samples which was broken up into five 10 meter transects. In each of these 10-m transects, 0.5 X 0.5 m quadrats were randomly selected for oyster assessments. Oysters were removed by physical removal by hand. Once back in the lab shell lengths were measured and dry weights were obtained.
Dry weight biomass measurements of net-collected mesozooplankton. Samples collected in the CCE-LTER region on Process Cruises from 2006 to the present. Summaries for each Lagrangian Cycle.
Mesozooplankton are collected with plankton nets (typically a 71-cm diameter, 202-um mesh Bongo net) and samples flash frozen at sea in liquid N2 for subsequent shore-based measurements of dry weight biomass. Measurements are made by weighing pre-tared Nitex mesh on an analytical balance, for mesozooplankton size-fractionated into 5 different categories (> 0.2 mm, 0.5 mm, 1.0 mm, 2.0 mm, 5.0 mm). Biomass is expressed as dry mass of zooplankton per m3 of water filtered, or when multiplied by the maximum depth of the tow, as integrated dry mass of zooplankton per m2 of sea surface. Samples for dry weight biomass have been collected on CCE-LTER Process Cruises since 2006 and these collections are ongoing.
Aboveground component weights (weight and dry) for the major tree species found in interior Alaska
Calculation of forest biomass requires the use of equations that relate the mass of a tree or its components to physical measurements that are relatively easy to obtain. Presented is the available data for various tree components (foliage, bark, stemwood, etc) of the five major tree species of interior Alaska. The tree components sampled and the number of sampled trees by species varied between the studies presented. Information collected by a number of researchers from a number of studies preformed from 1972 to 2004 are combined into one dataset.
Data from: The weight of the crust: biomass of crustose lichens in tropical dry forest represents more than half of foliar biomass
In recent years, our ecological knowledge of tropical dry forests has increased dramatically. However, the functional contributions of whole ecosystem components, such as lichens, remain mostly unknown. In these forests, the abundance of epiphyte crustose lichens is responsible for the characteristic white bark on most woody plants, conspicuous during the dry season, but the amount of resources that the lichen component represents remains unexplored. We estimated lichen biomass in a Mexican tropical dry forest using the bark area of trees, the dry mass of lichens per unit area and the percentage of bark covered by lichens, together with previously known tree densities. The lowest 2.5 m of the forests main trunks contained 188 kg/ha of lichen biomass, with lichens covering 85% of the available bark for trees <12 cm DBH and 38% for trees >12 cm. Total epiphytic lichen biomass was 1.34–1.99 Mg/ha. Lichen biomass represented 61% of the foliar biomass in the forest. To our knowledge, this is the first time that a lichen biomass estimate is provided for an ecosystem in which crustose lichens are the dominant lichen growth form. Crustose lichens are typically considered to contribute little to the total lichen biomass and to be difficult to include in ecological analyses. The high lichen biomass in this ecosystem implies a significant ecological role which so far is unexplored. We suggest the crustose lichen component should not be underestimated a priori in ecological studies, especially in ecosystems with abundant lichen cover.
Data from: The weight of the crust: biomass of crustose lichens in tropical dry forest represents more than half of foliar biomass
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Supplementary material 3 from: García-Barros E (2015) Multivariate indices as estimates of dry body weight for comparative study of body size in Lepidoptera. Nota Lepidopterologica 38(1): 59-74. https://doi.org/10.3897/nl.38.8957
Documentation on phylogeny.: Explanation note: This is a list of references including the most relevant sources of information used to build the hypothesis on phylogenetic relationships which were not quoted in the main text.
Supplementary material 2 from: García-Barros E (2015) Multivariate indices as estimates of dry body weight for comparative study of body size in Lepidoptera. Nota Lepidopterologica 38(1): 59-74. https://doi.org/10.3897/nl.38.8957
Frequency distribution graph.: Explanation note: Frequency distribution of the dry body weight data (mg) across the species studied.
Supplementary material 5 from: García-Barros E (2015) Multivariate indices as estimates of dry body weight for comparative study of body size in Lepidoptera. Nota Lepidopterologica 38(1): 59-74. https://doi.org/10.3897/nl.38.8957
Mean by superfamily.: Explanation note: Mean dry body weight and wing length by superfamily, and sample sizes.
Supplementary material 4 from: García-Barros E (2015) Multivariate indices as estimates of dry body weight for comparative study of body size in Lepidoptera. Nota Lepidopterologica 38(1): 59-74. https://doi.org/10.3897/nl.38.8957
Tree topology.: Explanation note: Graphic display (dendrogram) to show the hypothesis on phylogenetic relations adopted in this work, after the sources quoted in the main texta and in the file: Supplementary material 3.
Supplementary material 6 from: García-Barros E (2015) Multivariate indices as estimates of dry body weight for comparative study of body size in Lepidoptera. Nota Lepidopterologica 38(1): 59-74. https://doi.org/10.3897/nl.38.8957
Alternative models.: Explanation note: Alternative or suboptimal regression models derived from the species means or from the independent contrasts.
Supplementary material 1 from: García-Barros E (2015) Multivariate indices as estimates of dry body weight for comparative study of body size in Lepidoptera. Nota Lepidopterologica 38(1): 59-74. https://doi.org/10.3897/nl.38.8957
Nexus format text.: Explanation note: Tree topology for the phylogenetic hypothesis adopted, to be used as input in applications reading nexus (requires some slight previous edition).
Effect of Dry-weight Probing Guided by Lung-Ultrasound on Ambulatory Blood Pressure and Arterial Stiffness in Hemodialysis Patients (LUST Sub-Study)
ClinicalTrials.gov study NCT03058874. IPD Sharing: NO. Countries: 2. Publications: 15.
BIA-Guided Dry Weight Assessment on Sleep Quality in Chronic Hemodialysis Patients
ClinicalTrials.gov study NCT02825589. IPD Sharing: NO. Countries: 1. Publications: 1.
Probing the Dry Weight by Bioimpedance: The Resistance Stabilization Test
ClinicalTrials.gov study NCT02606955. IPD Sharing: Not stated. Countries: 1. Publications: 1.
The Use of Electrical Bioimpedance to Evaluate Dry Weight in Patients With Chronic Renal Failure in Hemodialysis
ClinicalTrials.gov study NCT03232515. IPD Sharing: UNDECIDED. Countries: 1. Publications: 16.
Data from: Refining estimates of dry body weight from linear measurements in adult moths and butterflies (Lepidoptera)
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