Spatial distribution and seasonal patterns of aquatic emergent plants in Southeast Brazil: Development of a tool for mass balances

1998 ◽  
pp. 63-73
Author(s):  
Aguinaldo Nepomuceno Marques ◽  
Ibra Touré
Keyword(s):  
Spatial Distribution ◽  
Seasonal Patterns ◽  
Mass Balances ◽  
Southeast Brazil ◽  
Emergent Plants

Spatial distribution and seasonal patterns of the siphonophores Muggiaea atlantica and Muggiaea kochii in a temperate estuarine ecosystem

2019 ◽  
Vol 218 ◽  
pp. 179-187
Author(s):  
Mariaelena D'Ambrosio ◽  
Ana L. Primo ◽  
Miguel A. Pardal ◽  
Filipe Martinho ◽  
Elena Guerrero ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Seasonal Patterns ◽  
Estuarine Ecosystem

Seed dispersal, seedling emergence, and early survival of Larixlaricina (DuRoi) K. Koch in the Tanana Valley, Alaska

1988 ◽  
Vol 18 (3) ◽  
pp. 306-314 ◽  
Author(s):  
K.R. Brown ◽  
D.B. Zobel ◽  
J.C. Zasada
Keyword(s):  
Spatial Distribution ◽  
Seedling Emergence ◽  
Mineral Soil ◽  
Seasonal Patterns ◽  
Coniferous Species ◽  
Moisture Contents ◽  
Wetland Site ◽  
Early Survival ◽  
Dispersal Distances ◽  
Site Types

The seasonal and spatial patterns of seed release, germling emergence, and early survival of Larixlaricina (DuRoi) K. Koch were studied in 1980–1981 near Fairbanks, Alaska. Dispersal was studied on one wetland site. Seedling emergence and 1-year survival were studied on three wetland microsite types (troughs, feathermoss, and tussock tops, located at increasing elevations above permafrost) and in mineral soil and undisturbed feathermoss seedbeds in a mature Piceaglauca stand of alluvial origin. Approximately 95% of the viable Larix seed from the 1980 cone crop fell by November 1980. Spatial distribution of seed away from the stand was erratic because of variable winds and the presence of a single Larix away from the stand edge. Average dispersal distances were less than those reported for other coniferous species. Emergence and early survival in both site types were affected by seedbed type. In the alluvial stand, germination and 1-year survival were greater on mineral seedbeds than on feathermoss. Emergence began in mid-July, well after minimum temperatures required for germination had been reached; timing appeared to be related to differences in volumetric moisture contents of the two seedbed types. Although cumulative totals of emergence and mortality did not differ between microsite types in the wetland, seasonal patterns of each differed with microsite. Emergence in troughs was delayed until early July by cold seedbed temperatures; increased precipitation in mid to late July raised the water table and flooded newly emerged seedlings in trough microsites but moistened feathermoss sufficiently to promote germination. Variation in emergence and mortality was high within a given microsite type.

Modelling benthic activity in shallow eutrophic rivers

1998 ◽  
Vol 37 (3) ◽  
pp. 129-137 ◽  
Author(s):  
W. Rauch ◽  
P. A. Vanrolleghem
Keyword(s):  
Organic Matter ◽  
Spatial Distribution ◽  
Bacterial Species ◽  
Oxygen Depletion ◽  
Order Reaction ◽  
Fast Computation ◽  
Mass Balances ◽  
Multiple Substrate ◽  
Modelling Approach

In this paper a simple modelling approach is presented that allows fast computation of benthic activity in rivers. The approach extends the half-order reaction concept used in biofilm models for use in a multiple substrate/multiple bacterial species system. Moreover, it is compatible with the IAWQ Activated Sludge Model no. 1 format and has closed mass balances. The conversion of carbonaceous organic matter under aerobic and anoxic conditions and nitrification are represented in the model. The case study to which it was applied revealed that benthic activity is highly influenced by the eutrophic state of the river (presence/absence of algae) leading to diurnal oxygen fluctuations. More specifically the spatial distribution of species along the river was significantly different, resulting in postponed (downstream) nitrification in the eutrophied river. Also, oxygen depletion is found to be more severe and its spatial extension is larger.

Spatial distribution of microplastics in the superficial sediment of a mangrove in Southeast Brazil: A comparison between fringe and basin

2021 ◽  
pp. 146963
Author(s):  
Gabriela Carvalho Zamprogno ◽  
Felipe Barcellos Caniçali ◽  
Caroline dos Reis Cozer ◽  
Mariana Beatriz Paz Otegui ◽  
Jones Bernardes Graceli ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Southeast Brazil

scholarly journals Spatial distribution of the risk of dengue fever in southeast Brazil, 2006-2007

2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Ricardo Cordeiro ◽  
Maria R Donalisio ◽  
Valmir R Andrade ◽  
Ana CN Mafra ◽  
Luciana B Nucci ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Dengue Fever ◽  
Southeast Brazil

ON THE RESULTS OF REMOTE OBSERVATION OF PULSED ULTRA-LOW-FREQUENCY ELECTROMAGNETIC SIGNALS DETECTABLE MINUTES BEFORE AN EARTHQUAKE

2021 ◽  
Vol 43 (3) ◽  
pp. 304-313
Author(s):  
Boris DOVBNYA ◽  
Keyword(s):  
Spatial Distribution ◽  
Seismic Event ◽  
Low Frequency ◽  
Seasonal Patterns ◽  
Time Interval ◽  
Spring Period ◽  
The Earth ◽  
Remote Observation ◽  
Electromagnetic Signals ◽  
The Moment

Based on longterm observations at the latitudinally and longitudinally remote Borok and College geophysical observatories, the characteristics of electromagnetic ultralowfrequency (ULF) signals, detectable several minutes before a remote seismic event, are being analyzed. The diurnal and seasonal patterns in the frequency of these precursors’ occurrence at observatories, and their spatial distribution over the Earth’s surface, are investigated in this article. In the daily distribution, two maxima are distinguishable in the local evening and morning hours. In the seasonal course, there is a maximum in the spring period and an increase in the winter months. In the spatial distribution, the unevenness of the location of sources across the globe is noted; those are grouped into separate zones and segments, reflecting seismoelectromagnetic activity across specific regions. Examples are given to illustrate the appearance of precursors. It is noted that the dynamic spectra of signals from earthquakes occurring in different regions of the Earth were similar, repeated at different magnitudes and depths of the source, and were observed in the same time interval relative to the moment of the earthquake. The results of the analysis justify an assumption of the universality of the patterns governing the generation of impulse precursors preceding an earthquake, as well as the possibility of shortterm warning (within a few minutes) of an approaching earthquake.

scholarly journals A Dynamic Biofilm Model for a Microbial Electrolysis Cell

Processes ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 183 ◽  
Author(s):  
René Flores-Estrella ◽  
Uriel de Jesús Garza-Rubalcava ◽  
Andreas Haarstrick ◽  
Victor Alcaraz-González
Keyword(s):  
Spatial Distribution ◽  
Partial Differential Equations ◽  
Numerical Methods ◽  
Differential Equations ◽  
Mathematical Description ◽  
Electrolysis Cell ◽  
Microbial Electrolysis Cell ◽  
Mass Balances ◽  
Biofilm Model ◽  
Microbial Electrolysis

In this work, a mathematical description of a Microbial Electrolysis Cell (MEC) is proposed, taking into account the global mass balances of the different species in the system and considering that all the involved microorganisms are attached to the anodic biological film. Three main biological reactions are introduced, which were obtained from the solution of partial differential equations describing the spatial distribution of potential and substrate in the biofilm. The simulation of the model was carried out using numerical methods, and the results are discussed.

scholarly journals The Logic of Ceramic Technology in Marginal Environments: Implications for Mobile Life

2016 ◽  
Vol 81 (4) ◽  
pp. 645-663 ◽  
Author(s):  
Camilla Sturm ◽  
Julia K. Clark ◽  
Loukas Barton
Keyword(s):  
Spatial Distribution ◽  
Residential Mobility ◽  
Ceramic Technology ◽  
Seasonal Patterns ◽  
Marginal Environments ◽  
Technological Adoption ◽  
Patterns Of Behavior ◽  
Key Variables ◽  
Manufacturing Time

Explanations for the use of pots as practical domestic tools permeate the literature of technological adoption and change. While many arguments focus on the economic merits of pots, few have attempted to trace the conditions that promote or deter the adoption of pottery. This is especially true for the use of pottery by mobile peoples. We adapt an established model of technological investment to draw attention to three key variables affecting pottery adoption: manufacturing time, utility, and use time. We use the logic of this model to examine how social and environmental contexts, specifically residential mobility in marginal environments, impacts use of and investment in ceramic technology. We further illustrate how the model can be used to reveal seasonal patterns of behavior from the spatial distribution of pottery discarded by mobile foragers and herders.

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