scholarly journals Some species flourish when many do not: a pattern in data on ecological communities

2021 ◽  
Author(s):  
Gerben Straatsma ◽  
Edwin T. H. M. Peeters ◽  
Egbert H. van Nes
Keyword(s):  
Environmental Conditions ◽  
Special Interest ◽  
Null Hypothesis ◽  
Correlation Study ◽  
Data Sets ◽  
Ecological Communities ◽  
Total Abundance ◽  
Theoretical Ecology ◽  
The Individual ◽  
Neutral Effect

AbstractPatterns in species × sample tables of communities depend above all on the organisms of the data sets and the conditions involved. Patterns that surpass individual sets are of special interest. Our question, looking for a shared pattern in 12 sets, is if relative abundances among species are independent of the sample, or formulated alternatively, if species have abundances that are correlated with total abundances over samples. For exploration we study the overdispersion/aggregation of the data. A relatively high variation in the total abundances of samples is noticed, indicating an effect of environmental variation. Overdispersion imposes constraints on the accommodation of relatively high abundance values to samples with a relatively low total abundance. The null hypothesis of ‘no association’ is modelled by permutation/resampling of the data at the level of the individual. A correlation study of actual and permuted sets is performed. All actual sets contain a significant number of species that defy our question. These species flourish when many do not. The relation of our question with issues in theoretical ecology, such as the assumption of a neutral effect of environmental conditions and/or of neutral characteristics of species, is discussed.

scholarly journals Inter and intraspecies comparison of the level of selected bacterial phyla in in cattle and sheep based on feces

2021 ◽  
Vol 17 (1) ◽  
Author(s):  
Natalia Szeligowska ◽  
Paulina Cholewińska ◽  
Katarzyna Czyż ◽  
Konrad Wojnarowski ◽  
Marzena Janczak
Keyword(s):  
Digestive Tract ◽  
Environmental Conditions ◽  
Genetic Factors ◽  
Disease Symptoms ◽  
Microbiome Composition ◽  
Bacterial Phyla ◽  
As Species ◽  
Individual Host ◽  
Host Effect ◽  
The Individual

Abstract Background The microbiome of the digestive tract of ruminants contains microbial ecosystem that is affected by both environmental and genetic factors. The subject of this study concerns the influence of selected genetic factors, such as species of animals and “host” individual differences on the digestive tract microbiome composition. The results show the core microbiological composition (Firmicutes and Bacteroidetes) of ruminants digestive tract (based on feces) depending on breed and “host”. The Bacteroidetes and Firmicutes phyla are the most abundant in ruminants digestive tract. The aim of the study was to determine the differences prevalence level of Bacteroidetes and Firmicutes phyla in feces of Charolaise cattle and Polish Olkuska Sheep with respect to intra- and inter-species variability. Results The research group in the experiment consisted of animals at the age of 3 months kept in the same environmental conditions – rams of Polish Olkuska Sheep (n = 10) and Charolaise bulls (n = 10). Feces were collected individually from each animal (animals without disease symptoms were selected), living on the same environmental conditions. The analysis of the results in terms of species showed differences in the Firmicutes phylum level and Lactobacillaceae family between rams and bulls. Subsequently, the analysis performed for the “host effect” showed differentiation in the levels of the Bacteroidetes and Firmicutes phyla between individuals in a group and also between the groups. Conclusion The obtained results suggest that, apart from the diet and the environment, the species and the individual host are equally important factors influencing the microbiological composition of the digestive system of ruminants.

scholarly journals Revisiting the Agung 1963 volcanic forcing – impact of one or two eruptions

2019 ◽  
Author(s):  
Ulrike Niemeier ◽  
Claudia Timmreck ◽  
Kirstin Krüger
Keyword(s):  
Radiative Forcing ◽  
Injection Rate ◽  
Data Sets ◽  
Meridional Transport ◽  
Emission Data ◽  
Volcanic Clouds ◽  
Different Seasons ◽  
Future Emission ◽  
Volcanic Emission ◽  
The Individual

Abstract. In 1963 a series of eruptions of Mt. Agung, Indonesia, resulted in the 3rd largest eruption of the 20th century and claimed about 1900 lives. Two eruptions of this series injected SO2 into the stratosphere, a requirement to get a long lasting stratospheric sulfate layer. The first eruption on March 17th injected 4.7 Tg SO2 into the stratosphere, the second eruption 2.3 Tg SO2 on May, 16th. In recent volcanic emission data sets these eruption phases are merged together to one large eruption phase for Mt. Agung in March 1963 with an injection rate of 7 Tg SO2. The injected sulfur forms a sulfate layer in the stratosphere. The evolution of sulfur is non-linear and depends on the injection rate and aerosol background conditions. We performed ensembles of two model experiments, one with a single and a second one with two eruptions. The two smaller eruptions result in a lower burden, smaller particles and 0.1 to 0.3 Wm−2 (10–20 %) lower radiative forcing in monthly mean global average compared to the individual eruption experiment. The differences are the consequence of slightly stronger meridional transport due to different seasons of the eruptions, lower injection height of the second eruption and the resulting different aerosol evolution. The differences between the two experiments are significant but smaller than the variance of the individual ensemble means. Overall, the evolution of the volcanic clouds is different in case of two eruptions than with a single eruption only. We conclude that there is no justification to use one eruption only and both climatic eruptions should be taken into account in future emission datasets.

Geodetic observations for constraining mantle processes in Antarctica

2021 ◽  
pp. M56-2021-22
Author(s):  
Mirko Scheinert ◽  
Olga Engels ◽  
Ernst J. O. Schrama ◽  
Wouter van der Wal ◽  
Martin Horwath
Keyword(s):  
Data Sets ◽  
Satellite Mission ◽  
Amundsen Sea ◽  
Isostatic Adjustment ◽  
Geodynamic Processes ◽  
Grace Satellite ◽  
Mantle Processes ◽  
Gnss Measurements ◽  
The Individual ◽  
Seismic Deformation

AbstractGeodynamic processes in Antarctica such as glacial isostatic adjustment (GIA) and post-seismic deformation are measured by geodetic observations such as GNSS and satellite gravimetry. GNSS measurements have been comprising continuous measurements as well as episodic measurements since the mid-1990s. The estimated velocities typically reach an accuracy of 1 mm/a for horizontal and 2 mm/a for vertical velocities. However, the elastic deformation due to present-day ice-load change needs to be considered accordingly.Space gravimetry derives mass changes from small variations in the inter-satellite distance of a pair of satellites, starting with the GRACE satellite mission in 2002 and continuing with the GRACE-FO mission launched in 2018. The spatial resolution of the measurements is low (about 300 km) but the measurement error is homogeneous across Antarctica. The estimated trends contain signals from ice mass change, local and global GIA signal. To combine the strengths of the individual data sets statistical combinations of GNSS, GRACE and satellite altimetry data have been developed. These combinations rely on realistic error estimates and assumptions of snow density. Nevertheless, they capture signal that is missing from geodynamic forward models such as the large uplift in the Amundsen Sea sector due to low-viscous response to century-scale ice-mass changes.

The Effect of Pursed - Lip Breathing Exercise Vs Diaphragmatic Breathing in Stabilizing the Vitals after 6-MWT among Overweight Individuals

2021 ◽  
Vol 9 (VIII) ◽  
pp. 299-308
Author(s):  
Dr. Jaya Chandra
Keyword(s):  
Carbon Dioxide ◽  
Data Collection ◽  
Null Hypothesis ◽  
Deep Breathing ◽  
Diaphragmatic Breathing ◽  
Breathing Exercise ◽  
Breathing Exercises ◽  
Paired Samples ◽  
The Individual ◽  
Harmful Effects

When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide. To cope with this extra demand, your breathing has to increase from about 15 times a minute (12 litres of air) when you are resting, up to about 40–60 times a minute (100 litres of air) during exercise. Your circulation also speeds up to take the oxygen to the muscles so that they can keep moving. Any kind of exertion causes some change in vitals. Some amount of fluctuation in vitals after any kind of exertion occurs in every individual and is considered to be normal. But if there is extreme fluctuation in vitals even after mild or moderate form of exertion, it indicates some kind of abnormality or an increased stress on cardiovascular or respiratory system and needs attention.In any case if the vitals fluctuate during any kind of exertion it needs to be stabilized so that its harmful effects can be avoided. For these breathing exercises have been proven to be very beneficial. There are several types of breathing exercises such as deep breathing, diaphragmatic breathing, pursed lip breathing, etc. The need for the study is to compare the effectiveness of Pursed-Lip Breathing & Diaphragmatic Breathing exercise instabilizing the vitals after 6 MWT in young individuals. The objective of this study is to measure the exertion level of the individual, to assess the effect of pursed lip and diaphragmatic breathing exercises on vitals after exertion and also the comparison of both techniques. In the present study we took 60 subjects from saaii college, Kanpur. Method of data collection is random and study design is comparative study with study duration of 4 weeks. Subjects were divided into two equal groups. The paired samples t-test shows significant changes observed i.e., null hypothesis is rejected and alternate hypothesis is accepted and we observed that significant improvement along with effectiveness of pursed lip breathing on stabilizing vitals in overweight individuals.

scholarly journals EMPIRICAL CRITERIA FOR PHYTOMONITORING OF TECHNOGENIC LOAD IN DONBASS

ÈKOBIOTEH ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 195-202
Author(s):  
A.I. Safonov ◽  
◽  
A.Z. Glukhov ◽  
Keyword(s):  
Heavy Metals ◽  
Correlation Analysis ◽  
Environmental Conditions ◽  
Structural Heterogeneity ◽  
Soil Samples ◽  
Anthropogenic Load ◽  
Data Sets ◽  
Plantago Major ◽  
Indicator Plants

From the data on the structural heterogeneity of indicator plants (Berteroa incana (L.) DC., Plantago major L., Reseda lutea L., Echium vulgare L., and Capsella bursa-pastoris (L.) Medik.) under unfavorable environmental conditions of Donbass selected their most informative characteristics for a general assessment of the level of anthropogenic load on local ecotopes. Empirical criteria were calculated as a result of correlation analysis between data sets on the content of heavy metals in soil samples and the values of phytoindication indices.

scholarly journals Isolated individuals and groups show opposite preferences toward humidity

2018 ◽  
Author(s):  
Mariano Calvo Martín ◽  
Stamatios C. Nicolis ◽  
Isaac Planas-Sitjà ◽  
Jean-Christophe de Biseau ◽  
Jean-Louis Deneubourg
Keyword(s):  
Relative Humidity ◽  
Environmental Conditions ◽  
Group Level ◽  
Individual Level ◽  
Negative Effect ◽  
Multi Level ◽  
The Individual ◽  
Shed Light ◽  
Selection Of

AbstractCockroaches, like most social arthropods, are led to choose collectively among different alternative resting places. These decisions are modulated by different factors, such as environmental conditions (temperature, relative humidity) and sociality (groups size, nature of communications). The aim of this study is to establish the interplay between environmental conditions and the modulation of the interactions between individuals within a group leading to an inversion of preferences. We show that the preferences of isolated cockroaches and groups of 16 individuals, on the selection of the relative humidity of a shelter are inversed and shed light on the mechanisms involved. We suggest that the relative humidity has a multi-level influence on cockroaches, manifested as an attractant effect at the individual level and as a negative effect at the group level, modulating the interactions.

scholarly journals Increasing the Research Value of Digitized Fossil Museum Specimens via Integrated Stable Isotope Data

2018 ◽  
Vol 2 ◽  
Author(s):  
Sean Moran ◽  
Bruce MacFadden ◽  
Michelle Barboza
Keyword(s):  
Stable Isotope ◽  
Data Sets ◽  
Museum Specimens ◽  
Ancillary Data ◽  
Deep Time ◽  
Aggregated Data ◽  
Isotope Data ◽  
The Status ◽  
The Individual ◽  
Stable Isotope Data

Over the past several decades, thousands of stable isotope analyses (δ13C, δ18O) published in the peer-reviewed literature have advanced understanding of ecology and evolution of fossil mammals in Deep Time. These analyses typically have come from sampling vouchered museum specimens. However, the individual stable isotope data are typically disconnected from the vouchered specimens, and there likewise is no central repository for this information. This paper describes the status, potential, and value of the integration of stable isotope data in museum fossil collections. A pilot study in the Vertebrate Paleontology collection at the Florida Museum of Natural History has repatriated within Specify more than 1,000 legacy stable isotope data (mined from the literature) with the vouchered specimens by using ancillary non Darwin Core (DwC) data fields. As this database grows, we hope to both: validate previous studies that were done using smaller data sets; and ask new questions of the data that can only be addressed with larger, aggregated data sets. validate previous studies that were done using smaller data sets; and ask new questions of the data that can only be addressed with larger, aggregated data sets. Additionally, we envision that as the community gains a better understanding of the importance of these kinds of ancillary data to add value to vouchered museum specimens, then workflows, data fields, and protocols can be standardized.

Environmental Conditions of the Work Organization for the Disabled People

2000 ◽  
Vol 44 (8) ◽  
pp. 70-70
Author(s):  
Ewa Górska
Keyword(s):  
Working Conditions ◽  
Environmental Conditions ◽  
Social Economic ◽  
Sense Of Self ◽  
Work Organization ◽  
Disabled People ◽  
The Disabled ◽  
The Individual ◽  
A Company

A disabled person in a company is affected by a number of various environmental conditions. Among these the most important are such as organizational, technical, social, economic and, finally, legal working conditions. The standard and quality of the just mentioned conditions determine significantly the way in which a disabled person performs the assigned tasks and duties in the company and it also helps to create the individual sense of self-fulfillment and work satisfaction. What is more, at the same time the level of environmental conditions influences directly work efficiency and profits of the company. It must be clearly stated that working conditions do not appear immediately and spontaneously - they need careful planning and modern organization. This research paper presents the environmental conditions and discusses a model design of the work organization for the disabled people.

GENDER DIFFERENCES IN BODY SELF-RELATION AMONG YOUNG ADULTS IN INDIA

2021 ◽  
Vol 1 (8) ◽  
pp. 149-156
Author(s):  
Ranjini Karthikeyan ◽  
Amiya Bhaumik
Keyword(s):  
Gender Differences ◽  
Body Image ◽  
Young Adults ◽  
Null Hypothesis ◽  
Body Shape ◽  
Male And Female ◽  
Significant Difference ◽  
Female Data ◽  
Body Self ◽  
The Individual

Body self-relation is a multidimensional construct defined by persons" perceptions of and attitudes about their body. Body image does not simply reflect the biological enrichment of the individual or the feedback received from the significant others. The way you perceive about your body is your cognitive body image. This can lead to excessive concern with body shape and weight. Behaviors in which you relate as a result of your body image encompass your behavioral body image. A study based on the gender differences in body relation relating to young adults rating the comparison in perception of both male and female data. Hundred participants of both male and female took part in answering the by Multidimensional body selfrelations questionnaire (MBSRQ-AS). Results demonstrated by Mann Whitney U test revealed that there is significant difference between male and female young adults in their relation to body self, p<0.05, (2- tailed) in appearance orientation. There is no statistical sig.>0.05 differences in the other dimensions. Therefore, this study rejects the null hypothesis in (dimension) appearance orientation and accepts the null hypothesis (dimensions) in appearance evaluation, body area satisfaction, overweight preoccupation and self-classified weight. Keywords: body self-relation; gender differences

"MULTIPLE-COMPARISONS" PROBLEM

PEDIATRICS ◽  
1989 ◽  
Vol 84 (6) ◽  
pp. A30-A30
Author(s):  
Student
Keyword(s):  
Null Hypothesis ◽  
Multiple Comparisons ◽  
P Value ◽  
Expected Number ◽  
P Values ◽  
A Value ◽  
True Null Hypotheses ◽  
The Individual

Often investigators report many P values in the same study. The expected number of P values smaller than 0.05 is 1 in 20 tests of true null hypotheses; therefore the probability that at least one P value will be smaller than 0.05 increases with the number of tests, even when the null hypothesis is correct for each test. This increase is known as the "multiple-comparisons" problem...One reasonable way to correct for multiplicity is simply to multiply the P value by the number of tests. Thus, with five tests, an orignal 0.05 level for each is increased, perhaps to a value as high as 0.25 for the set. To achieve a level of not more than 0.05 for the set, we need to choose a level of 0.05/5 = 0.01 for the individual tests. This adjustment is conservative. We know only that the probability does not exceed 0.05 for the set.

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