scholarly journals General Patterns of Spatial Distribution of the Integral Characteristics of Benthic Macrofauna of the Northwestern Pacific and Biological Structure of Ocean

2014 ◽  
Vol 04 (04) ◽  
pp. 196-213 ◽  
Author(s):  
Igor V. Volvenko
Keyword(s):  
Spatial Distribution ◽  
Benthic Macrofauna ◽  
Northwestern Pacific ◽  
Biological Structure ◽  
Integral Characteristics

scholarly journals SIMULATION OF SPATIAL DISTRIBUTION OF RARE SPECIES IN PROTECTED NATURAL AREAS (ON THE EXAMPLE OF THE CENTRAL FOREST RESERVE, RUSSIA)

2019 ◽  
Vol 1 ◽  
pp. 75
Author(s):  
Anatoly Istomin ◽  
Sergey Mikhalap
Keyword(s):  
Spatial Distribution ◽  
Habitat Suitability ◽  
Rare Species ◽  
Vegetation Type ◽  
Biosphere Reserve ◽  
Entropy Method ◽  
Natural Areas ◽  
Forest Reserve ◽  
Integral Characteristics ◽  
Protected Natural Areas

An important task of modern ecology is the modeling of the spatial distribution of organisms. Of particular relevance is the modeling of the distribution of rare species in protected natural areas. The paper discusses the main stages and presents the results of modeling the habitat suitability of the Central Forest State Nature Biosphere Reserve (Russia, Tver region) for the red vole. This species is a rare and relict for the center of the Caspian-Baltic watershed. In the modelling the maximum entropy method (MaxEnt) was used. The basis for building the model was the field sampling of the authors, performed in July-August 2010-2014. Each year, trapping were carried out at 745 sampling points each of which has geographical referencing in the WGS 84. A total of 12238 trap-days were worked out and 141 red vole individuals were caught. In the process of modeling, the contribution to the species distribution of certain integral characteristics of habitats (relief, vegetation type and three vegetation spectral indices) was determined. A map model of habitat suitability for the red vole on the territory of the Reserve was built, which allowed to describe the spatial structure of the population groups of the species. The total areas of the most favorable sites for the habitat of the red vole on the reserve's territory were calculated.

scholarly journals Spatial distribution of benthic macrofauna in subtidal sediments of the Ría de Aldán (Galicia, northwest Spain)

2010 ◽  
Vol 74 (4) ◽  
pp. 705-715 ◽  
Author(s):  
Antía Lourido ◽  
Juan Moreira ◽  
Jesús S. Troncoso
Keyword(s):  
Spatial Distribution ◽  
Benthic Macrofauna

Large-Scale Spatial Pattern of the Macrobenthic Diversity in the Eastern English Channel

1996 ◽  
Vol 76 (1) ◽  
pp. 153-160 ◽  
Author(s):  
Laura Añorve-Sanvicente ◽  
Alain Leprêtre ◽  
Dominique Davoult
Keyword(s):  
Spatial Distribution ◽  
Large Scale ◽  
Diversity Index ◽  
Research Programme ◽  
Benthic Macrofauna ◽  
English Channel ◽  
Geographic Scale ◽  
Two Factors ◽  
Smoothing Procedure

A description is provided of the large-scale spatial distribution of the diversity of the benthic macrofauna in the eastern English Channel. Data from the oceanographic cruises of the RCP (Recherche Coopérative sur Programme) Benthos de la Manche Research Programme were obtained during the summers of 1971 to 1975. A total of 707 samples were analysed.Diversity of each sample was measured by means of the species richness (i.e. the total number of species present), the Shannon-Weaver diversity index and Pielou's evenness index. Diversity values were plotted for all 707 oceanographic stations in the area, following a smoothing procedure. Large-scale spatial trends of diversity of the benthic macrofauna were analysed in relation to sediment and species assemblage distribution, but no spatial correlation was found between the two factors. These results indicate that mechanisms affecting large-scale spatial distribution of the diversity are different from those acting on a smaller scale. The role of the hydro-sedimentary processes acting at the geographic scale of the eastern English Channel as presumptive causes of this large-scale pattern of the macrobenthic diversity is discussed.

scholarly journals Spatial distribution of macrobenthic fauna on three sandy beaches from northern Rio Grande do Sul, southern Brazil

2006 ◽  
Vol 54 (2-3) ◽  
pp. 135-145 ◽  
Author(s):  
Frederico Monteiro Neves ◽  
Carlos Emílio Bemvenuti
Keyword(s):  
Spatial Distribution ◽  
Environmental Parameters ◽  
Abundant Species ◽  
Sandy Beaches ◽  
Average Density ◽  
Benthic Macrofauna ◽  
Swash Zone ◽  
Sediment Grain Size ◽  
Horizontal Variation ◽  
Three Samples

The spatial distribution of benthic macrofauna on the beaches of Tramandaí, Jardim do Éden and Harmonia, was investigated over five consecutive days in April, 2003. The distribution pattern was also analyzed along with environmental parameters. Three transects were set on each beach, 50 m apart, with four sample stations set along each transect. On every station, three samples of benthic macrofauna were taken daily, with a core sampler with 20 cm diameter. In the midlittoral zone, the polychaete Euzonus furciferus and the isopod Excirolana armata dominated. In the swash zone, tidal migrators, Emerita brasiliensis,Donax hanlevanus and Mesodesma mactroides, were the most abundant species and, on some days, the polychaete Scolelepis gaucha. In the lower zones of the beaches, D. hanleyanus,M. mactroides and the amphipod Puelche orensani dominated. This zonation pattern was found for all three studied beaches, based on the average density of each species, over the five days period. Horizontal variation in the fauna was not found, either inter or intra the studied beaches, possibly due to little variability in slope and homogeneity of sediment grain size presented in the three beaches.

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