Natural variation of profundal macroinvertebrate communities in boreal lakes is related to lake morphometry: implications for bioassessment

2009 ◽  
Vol 66 (4) ◽  
pp. 589-601 ◽  
Author(s):  
Jussi Jyväsjärvi ◽  
Kimmo T. Tolonen ◽  
Heikki Hämäläinen
Keyword(s):  
Environmental Factors ◽  
Human Activities ◽  
Natural Variation ◽  
Geographical Location ◽  
Boreal Lakes ◽  
Biological Assessment ◽  
Compositional Variation ◽  
Macroinvertebrate Communities ◽  
Lake Morphometry ◽  
Partial Canonical Correspondence Analysis

Modern biological assessment of aquatic systems is often based on the reference condition approach, which requires characterization of biota in undisturbed conditions. For this approach, it is essential to recognize the origins and degree of natural variation in communities. We used data from 55 minimally disturbed Finnish lake basins to investigate the natural variation of profundal macroinvertebrate community composition in relation to environmental factors. Partial canonical correspondence analysis showed that most (68% combined, 39% uniquely) of the total explained compositional variation (29%) was correlated with environmental variables insensitive to human activities, especially lake morphometry. In contrast, the unique contributions of geographical location and variables influenced by human activities (dissolved oxygen and total phosphorus) were substantially smaller (5.5% and 22%, respectively). All of the explained variation (38%–64%) of three widely used community metrics was also correlated with human-insensitive environmental factors. The results suggest that variation in undisturbed profundal invertebrate communities of reference sites is strongly dependent on variables insensitive to human activities and especially on those related to lake morphometry, suggesting that reference communities for bioassessment of impacted lakes should be rather predictable from these variables.

scholarly journals Lake morphometry moderates the relationship between water color and fish biomass in small boreal lakes

2018 ◽  
Vol 63 (5) ◽  
pp. 2171-2178 ◽  
Author(s):  
David A. Seekell ◽  
Pär Byström ◽  
Jan Karlsson
Keyword(s):  
Boreal Lakes ◽  
Fish Biomass ◽  
Lake Morphometry ◽  
Water Color ◽  
The Relationship

scholarly journals Britain Breathing: using the experience sampling method to collect the seasonal allergy symptoms of a country

2017 ◽  
Vol 25 (1) ◽  
pp. 88-92 ◽  
Author(s):  
Markel Vigo ◽  
Lamiece Hassan ◽  
William Vance ◽  
Caroline Jay ◽  
Andrew Brass ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Sampling Method ◽  
Geographical Location ◽  
Experience Sampling ◽  
Experience Sampling Method ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
The Uk ◽  
Seasonal Allergies ◽  
Allergy Symptom

Abstract Objective Allergies are increasing, but the reasons for this are unclear. Although environmental factors are thought to be important, there is a lack of data on how they contribute to symptom development. To understand this relationship better, we need accurate data about both symptoms and environmental factors. Our objective here is to ascertain whether experience sampling is a reliable approach for collecting allergy symptom data in the general population, allowing us to map symptoms and understand etiology. Materials and Methods We conducted a 32-week cross-sectional study where individuals reported their seasonal allergy symptoms and severity via a mobile application. Symptom geographical location and timestamp were also collected automatically. Results The experience sampling method reliably infers the incidence of seasonal allergies as indicated by the strong correlation (r = 0.93, P < .003) between the reported lack of wellness and the number of antihistamines prescribed by General Practitioners. Discussion and Conclusion The project has resulted in the first dataset to map allergy symptoms over time and place and reveals periods of peak hay fever symptoms in the UK.

Man-induced Environmental Factors in Relation to Fertility Changes in Pinnipeds

1984 ◽  
Vol 11 (1) ◽  
pp. 61-65 ◽  
Author(s):  
Peter J.H. Reijnders
Keyword(s):  
Environmental Factors ◽  
Reproductive Performance ◽  
Human Activities ◽  
Reproductive Failure ◽  
Cause And Effect ◽  
Physiological Processes ◽  
Effect Relation ◽  
Reproductive Rates

The possible effects of human activities (such as the release of pollutants, exploitation, and disturbance) on the reproductive performance of pinniped populations (especially of certain seals) are discussed. While there are documented cases of reproductive rates increasing in exploited seal populations, the effects of disturbance on reproduction have only been suggested on the basis of rather incidental observations.In a number of cases the decline of a pinniped population has coincided with an elevation in the level of various contaminants. In some animals, reproductive failure has been associated with high levels of contaminants in their tissues; but even in these cases, no cause-and effect relation between pollutants and altered physiological processes has been established. Clearly, far more research will be needed to elucidate these problems.

scholarly journals Composition and Associations of the Infant Gut Fungal Microbiota with Environmental Factors and Childhood Allergic Outcomes

mBio ◽  
2021 ◽  
Author(s):  
Rozlyn C. T. Boutin ◽  
Hind Sbihi ◽  
Ryan J. McLaughlin ◽  
Aria S. Hahn ◽  
Kishori M. Konwar ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Early Life ◽  
Geographical Location ◽  
Fungal Communities ◽  
First Year ◽  
Season Of Birth ◽  
Early Life Factors ◽  
Fungal Microbiota ◽  
First Year Of Life ◽  
First Time

Recent evidence suggests an immunomodulatory role for commensal fungi (mycobiota) in the gut, yet little is known about the composition and dynamics of early-life gut fungal communities. In this work, we show for the first time that the composition of the gut mycobiota of Canadian infants changes dramatically over the course of the first year of life, is associated with environmental factors such as geographical location, diet, and season of birth, and can be used in conjunction with knowledge of a small number of key early-life factors to predict inhalant atopy status at age 5 years.

scholarly journals The Value of Tropical Plant Diversity

EDIS ◽  
2019 ◽  
Vol 2019 (4) ◽  
pp. 5
Author(s):  
Cliff Martin ◽  
Zachary Brym
Keyword(s):  
Environmental Factors ◽  
Plant Diversity ◽  
Human Activities ◽  
Human Choice ◽  
Tropical Plant ◽  
Research And Education

This new 5-page document discusses plant diversity at the UF/IFAS Tropical Research and Education Center, environmental factors and human activities affecting these plants, assemblages of species based on levels of disturbance, human choice, and other factors, and the diverse needs these plants meet. Written by Cliff G. Martin and Zachary T. Brym, and published by the UF/IFAS Agronomy Department, June 2019. https://edis.ifas.ufl.edu/ag435

scholarly journals Comparative Analyses of Phytochemical Variation Within and Between Congeneric Species of Willow Herb, Epilobium hirsutum and E. parviflorum: Contribution of Environmental Factors

2021 ◽  
Vol 11 ◽  
Author(s):  
Mitra Mohammadi Bazargani ◽  
Mohsen Falahati-Anbaran ◽  
Jens Rohloff
Keyword(s):  
Environmental Factors ◽  
Secondary Metabolites ◽  
Natural Variation ◽  
Principal Component ◽  
Chemical Compounds ◽  
Mass Spectrometry Analysis ◽  
Gas Chromatography Mass Spectrometry ◽  
Significant Information ◽  
Important Species ◽  
Bioclimatic Variables

The plants in the Epilobium genus are considered to have several important medicinal properties due to their unique chemical composition. Although metabolic profiles of medicinal plants are mainly controlled by genetic factors, their production is also to some degree influenced by environmental factors, thus, variations in the levels of phytochemicals may represent long-term ecological and evolutionary interactions. In order to depict the magnitude of natural variation in level of chemical compounds among conspecific populations of Epilobium hirsutum (n = 31) and E. parviflorum (n = 16), metabolite profiling of aerial parts of plants was performed with gas chromatography/mass spectrometry analysis. Putative identification and structure annotation revealed the presence of 74 compounds including 46 compounds considered secondary metabolites categorized into flavonoids (n = 8), phenolic acids (n = 26), steroids (n = 3), and terpenes (n = 5) across all populations. Although there was a considerable natural variation among conspecific populations, principal component analysis revealed a clear separation of populations of each species based on the second main principal component which was highly correlated with eight secondary metabolites. The level of secondary metabolites was significantly correlated between species (r = 0.91), suggesting shared metabolic pathways underlying the production of chemical compounds. In addition, redundancy and variance partitioning analyses by including bioclimatic variables and altitude revealed a significant contribution of elevation in explaining the total variation of secondary metabolites in E. hirsutum. Two-thirds of all secondary metabolites were significantly correlated with altitude in E. hirsutum. The large-scale geographic analyses of populations revealed additionally detected flavonoids and terpenes (E. hirsutum and E. parviflorum) and steroids (E. hirsutum) for the first time. This study provides significant information on additional chemical compounds found across the distribution range of the two ecologically important species of willow herb and emphasizes the importance of geographic-wide sampling as a valuable strategy to depict intraspecific and interspecific variability in chemical traits.

River channel habitat diversity (RCHD) and macroinvertebrate community

Biologia ◽  
2011 ◽  
Vol 66 (2) ◽  
Author(s):  
Jiří Kokeš
Keyword(s):  
Current Velocity ◽  
Human Activities ◽  
Diversity Index ◽  
Habitat Diversity ◽  
River Channel ◽  
Macroinvertebrate Community ◽  
Macroinvertebrate Communities ◽  
Wiener’S Index ◽  
Site Diversity

AbstractCorrespondence of habitat and macroinvertebrate diversity was investigated in twenty Czech rivers. With regard to the importance of river characteristics (depth, current velocity and substratum) River Channel Habitat Diversity method was developed within this paper. The method is focused directly on the stream wetted channel and it assesses habitat diversity and richness computed as Shannon-Wiener’s index. Macroinvertebrate samples were taken by the national PERLA method at each study site, diversity index was also calculated and compared with habitat and substrate diversity. Habitat diversity was important for macroinvertebrate communities according to multivariate assessment, but contrary to the hypothesis it was not significantly correlated with macroinvertebrate diversity. Based on the results, broader rivers had lower habitat diversity than smaller streams, and were more influenced by human activities (lower habitat diversity, higher pollution). Results obtained by the RCHD and RHS methods were not significantly correlated.

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