scholarly journals Fen restoration: defining a reference ecosystem using paleoecological stratigraphy and present-day inventories

Botany ◽  
2017 ◽  
Vol 95 (7) ◽  
pp. 731-750 ◽  
Author(s):  
Vicky Bérubé ◽  
Line Rochefort ◽  
Claude Lavoie
Keyword(s):  
Environmental Variables ◽  
Ecosystem Dynamics ◽  
Forest Understory ◽  
Thuja Occidentalis ◽  
Generalist Species ◽  
Fen Restoration ◽  
Elevated Water Table ◽  
Elevated Water ◽  
Reference Ecosystem

Choosing past and present-day indicators could strengthen the reference ecosystem used for ecological restoration projects. Based on the paleoecological analysis of four peat cores and the characterization of 13 contemporary natural sites, the reference ecosystem for minerotrophic peatlands in southeastern Canada is composed of two broad categories of plant assemblages described as tall-sedge and Sphagnum–Thuja/brown moss. In paleoecological peat profiles, tall-sedge communities were found at the transition between aquatic and terrestrial, and were associated with high graminoid production, riverine peatlands, and elevated water table in the present-day analyses. Sphagnum–Thuja communities resemble the present-day vegetation found in natural basin type peatlands. Except for Sphagnum warnstorfii Russ., these communities, with high taxonomical diversity, contain more generalist species from boreal peatland vegetation, such as Rhododendron groenlandicum (Oeder) Kron & Judd, Thuja occidentalis L., Linnaea borealis L., and Maianthemum trifolium L. They grow in dryer or shady habitats such as hummocks or forest understory. The importance of brown mosses was revealed by paleoecological analysis. Overall, findings from both approaches are complementary: paleoecological stratigraphy informs us about past ecosystem dynamics, while present-day inventories allow us to define current plant communities and their major environmental characteristics. The range of variability of vegetation and environmental variables found in these studies are essential tools for fen restoration projects.

The effects of a permanently elevated water table in an acid sulphate soil on reed canary grass for combustion

2013 ◽  
Vol 375 (1-2) ◽  
pp. 149-158 ◽  
Author(s):  
Kenedy E. Epie ◽  
Seija Virtanen ◽  
Arja Santanen ◽  
Asko Simojoki ◽  
Frederick L. Stoddard
Keyword(s):  
Water Table ◽  
Reed Canary Grass ◽  
Acid Sulphate Soil ◽  
Acid Sulphate ◽  
Elevated Water Table ◽  
Canary Grass ◽  
Elevated Water

Spatial prediction of soil parameters after wildfire and their relationship with ecological process of soil and vegetation

2021 ◽  
Author(s):  
David Banda Carrasco ◽  
Violeta Tolorza ◽  
Mauricio Galleguillos
Keyword(s):  
Prediction Interval ◽  
Additive Model ◽  
Chemical Characterization ◽  
Spatial Prediction ◽  
Ecosystem Dynamics ◽  
Burn Severity ◽  
Soil Parameters ◽  
Predictive Variables ◽  
Interval Coverage

<p>Novel estimations of burn severity consequences are relevant to improve the understanding of spatial ecosystem dynamics between soil and vegetation. In this study, we implemented digital soil mapping (DSM) with Random Forest (RF) and generalized additive model (GAM) as internal statistical models, to generate maps for spatial prediction of chemical parameters of post-fire litter (N, P, C and OM) in the Purapel River basin, Maule region of Chile. Response variables were the chemical characterization of 67 samples of litter collected in different hillslopes of the basin during the first post-fire winter. The predictive variables that fed the RF model were spectral, topographic, and vegetation structure derivations, obtained from free and private use satellite products (Sentinel 1, Sentinel 2, LiDAR and TanDEM-X). As a result, we generated maps of post-fire spatial distribution of N, P, C and OM with acceptable adjustment (R<sup>2</sup> 0.52-0.61, nRMSE 54-72, pbias 0.35-1.20). The uncertainty associated with the predictions of these variables was successfully evaluated with the prediction interval coverage probability (PICP). A clear decrease on the concentration of litter elements is observed respect to the degree of burn severity, and this relationship depends on the type of cover and the environmental gradient where they are distributed.</p>

Preventing Acid Mine Drainage with an Elevated Water Table: Long-Term Column Experiments and Parameter Analysis

2010 ◽  
Vol 213 (1-4) ◽  
pp. 437-458 ◽  
Author(s):  
Mariam Ouangrawa ◽  
Michel Aubertin ◽  
John W. Molson ◽  
Bruno Bussière ◽  
Gérald J. Zagury
Keyword(s):  
Acid Mine Drainage ◽  
Water Table ◽  
Mine Drainage ◽  
Parameter Analysis ◽  
Column Experiments ◽  
Acid Mine ◽  
Elevated Water Table ◽  
Elevated Water

Environmental characterization of the Outer Hebrides

1979 ◽  
Vol 77 ◽  
pp. 535-549
Author(s):  
J. N. R. Jeffers
Keyword(s):  
Information System ◽  
Environmental Variables ◽  
Terrestrial Environment ◽  
Environmental Characterization ◽  
Outer Hebrides

SynopsisPreliminary stratification of the Outer Hebrides provides a basis for new surveys, and can be developed from the information held in the Institute of Terrestrial Ecology's Terrestrial Environment Information System. Characterizations of the area by environmental variables at various scales indicate several distinctive stratifications with predictive capabilities and suggest possible topics for future survey and research.

scholarly journals ESTRUCTURA DE LA TAXOCENOSIS ANNELIDA-MOLLUSCA EN LA REGION DE MINGUEO, GUAJIRA (CARIBE, COLOMBIANO)ESTRUCTURA DE LA TAXOCENOSIS ANNELIDA-MOLLUSCA EN LA REGION DE MINGUEO, GUAJIRA (CARIBE, COLOMBIANO)

2016 ◽  
Vol 26 ◽  
Author(s):  
Angela I. Guzmán Alvis ◽  
Oscar David Solano
Keyword(s):  
Grain Size ◽  
Environmental Variables ◽  
Explanatory Power ◽  
Fine Sand ◽  
Shallow Waters ◽  
Soft Bottom ◽  
Classification Analysis ◽  
Family Level ◽  
Sand Sediments

A punctual characterization of the soft-bottom macrobenthos was conducted on the continental shelf between Dibulla and Rio Palomino (Colombia). A net of 10 sample sites, 4 van Venn grabs per site, placed in deeps between 6 and 21.5 m, was sampled for this purpose. The results include 75% of the collected organisms, of which 69% were polychaeta and 6% mollusks. Analysis were performed at family level, in order to identify assemblages, a classification analysis between sample sites was performed and the groups there were confronted with the picture obtained from a non metric multidimensional scaling (NMDS). For each assemblage abundance, number of families, family dominance and diversity (K-dominance) were determined. By means of ABC curves the disturbance status of the assemblages was assessed. Finally, the pattern of distribution was related with water column depth and grain size of the sediments by means of the BIOENV technique. Results showed two assemblages called "Cossuridae" and "Lumbrineridae" on the basis of the polychaeta families that characterize them. The "Cossuridae" assemblage occurs in silt sediments offshore. It was the most diverse and showed the highest biomass levels. The Lumbrineridae assemblage occurs in fine sand sediments and shallow waters. The ABC curves analysis suggests that both assemblages are disturbed by natural causes since there is no human activity in the area. Water depth and fine sand were the environmental variables with the highest explanatory power in relation to the spatial distribution of the assemblages.

scholarly journals BIOLOGICAL AND ECOLOGICAL INSIGHTS FROM THE PRESERVATIONAL VARIABILITY OF FUNISIA DOROTHEA, EDIACARA MEMBER, SOUTH AUSTRALIA

Palaios ◽  
2020 ◽  
Vol 35 (9) ◽  
pp. 359-376
Author(s):  
RACHEL L. SURPRENANT ◽  
JAMES G. GEHLING ◽  
MARY L. DROSER
Keyword(s):  
South Australia ◽  
Ecosystem Dynamics ◽  
Cambrian Explosion ◽  
Ediacara Biota ◽  
National Heritage ◽  
Evolution Of Life ◽  
Fossil Site ◽  
Life On Earth ◽  
Body Fossil

ABSTRACT The Ediacara Biota represents a turning point in the evolution of life on Earth, signifying the transition from single celled organisms to complex, community-forming macrobiota. The exceptional fossil record of the soft-bodied Ediacara Biota provides critical insight into the nature of this transition and into ecosystem dynamics leading up to the so-called “Cambrian Explosion”. However, the preservation of non-biomineralizing organisms in a diversity of lithologies goes hand-in-hand with considerable taphonomic complexity that often shrouds true paleoecological and paleobiological signatures. We address the nature of this taphonomic complexity within the fossiliferous sandstones of the Ediacara Member in South Australia. Utilizing the most fossiliferous outcropping of the Ediacara Member, located at the Nilpena Station National Heritage Ediacara Fossil Site, we conduct a focused, taxon-level biostratinomic characterization of the tubular organism Funisia dorothea. Funisia is the most abundant body fossil in the Ediacara Member, making the characterization of its preservational variability essential to the accurate interpretation of regional paleobiology and paleoecology. We describe remarkable biostratinomic complexity in all Funisia populations at Nilpena, identifying four distinct preservational variants of internal and external molds and four additional successive biostratinomic grades corresponding to loss of external characters. Synthesis of these observations identify the most robust preservational forms of Funisia for use in paleobiological interpretation and highlight the important impact that Funisia's high abundance had on regional paleoecology and on population-scale preservation in the Ediacara Member.

What are the Characteristics of the Firms that are Most Prone to Mobile Selling?

2013 ◽  
pp. 192-211
Author(s):  
Sonia San-Martín
Keyword(s):  
Mobile Phone ◽  
Environmental Variables ◽  
Customer Value ◽  
Customer Relationship ◽  
Electronic Database ◽  
Survey Results ◽  
Relationship Performance ◽  
Perceived Customer Value

Vendors are actively considering the mobile phone as a means of marketing nowadays and should also analyze its potential as a means of selling. In this study, we present the survey results from a sample of 125 firms, in Spain. The author outlines two types of firms (sceptical and receptive) on the basis of factors that drive or inhibit this type of selling. The author then characterize those types of potential mobile firms regarding TOE (technological, organizational and environmental) variables and CRM (perceived customer relationship performance, perceived customer value, electronic database and benefits of mobile CRM) variables. To the best of the author’s knowledge, previous studies have neither analyzed mobile selling in Spain nor proposed an exhaustive characterization of mobile vendor firms and strategies.

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