Blackfly (Diptera, Simuliidae) communities and species richness estimation in Carpathian montane streams

2013 ◽  
Vol 8 (7) ◽  
pp. 681-692 ◽  
Author(s):  
Andrej Štangler ◽  
Jozef Halgoš ◽  
Pavel Beracko
Keyword(s):  
Species Richness ◽  
Environmental Factors ◽  
Species Composition ◽  
Flow Speed ◽  
Factors Affecting ◽  
Typical Species ◽  
Species Richness Estimation ◽  
West Carpathians ◽  
Montane Streams ◽  
First Time

AbstractThe present work gives the result of blackfly fauna research of the Slovenský raj (West Carpathians, Slovakia). Our aim was to describe the composition of blackfly communities, find indicator species for communities, describe environmental factors affecting communities and determine the potential changes in species richness. Research was carried out in 2007 and 2008. The presence of 22 species of blackflies was confirmed at 20 sites in the area of Slovenský raj. 12 species were recorded for the first time in this area. The potential for further increase in diversity was calculated by a nonparametric estimation of species richness. Two main groups of sites with their typical blackflies communities were indentified using a TWINSPAN analysis. The presence of Simulium ornatum, S. variegatum and S. argyreatum was typical in larger streams in broad valleys. The absence or low abundance of these species was typical for smaller streams in canyons. Based on the species composition of blackflies communities, we identified 6 groups of sites: 1. anthropogenically disturbed submountain rivers (typical species: Simulium ornatum, S. reptans, S. equinum), 2. undisturbed metarhithral (typical species: Simulium bertrandi, S. codreanui, S. costatum, S. vernum, S. argenteostriatum, S. degrangei, S. argyreatum, S. variegatum), 3. undisturbed hyporhithral (typical species: Simulium trifasciatum, S. tuberosum), 4. undisturbed epirhithral (typical species: Prosimulium hirtipes, P. rufipes), 5. hypocrenal (typical species: Simulium cryophilum, S. monticola) and 6. anthropogenically disturbed epirhithral (typical species: Simulium brevidens, S. maximum). The most important environmental factors explaining differences in species composition like altitude, flow speed, pH, conductivity, oxygen saturation, sulphates concentration and presence of riparian vegetation were identified by the CCA analysis.

scholarly journals Species composition, richness, and diversity of weed communities of winter arable land in relation to geo-environmental factors: a gradient analysis in mainland Italy

Botany ◽  
2020 ◽  
Vol 98 (7) ◽  
pp. 381-392 ◽  
Author(s):  
Emanuele Fanfarillo ◽  
Sandrine Petit ◽  
Fabrice Dessaint ◽  
Leonardo Rosati ◽  
Giovanna Abbate
Keyword(s):  
Species Richness ◽  
Environmental Factors ◽  
Species Composition ◽  
Arable Land ◽  
Weed Species ◽  
Winter Cereal ◽  
Shannon Diversity ◽  
Weed Communities ◽  
Crop Type ◽  
Arable Weed

The interest in knowledge of the weed communities of arable land is growing worldwide. Italy is one of the countries in Europe that is the most biodiverse, geographically and environmentally heterogeneous, and rich in arable weed species. Thus, in this study, the geo-environmental factors influencing the floristic composition, the species richness, and the Shannon diversity of weed communities of Italian winter arable crops were investigated along a gradient across mainland Italy. Original data were collected in the spring of 2018 in 106 winter cereal and legume arable fields from one fixed area plot per field. Environmental and geographic data were retrieved for each plot, including latitude, longitude, elevation, soil texture, soil pH, continentality, temperature, and precipitation. The effect of crop type was also tested. Latitude was the main driver of floristic differentiation between the studied plant communities, followed by precipitation, temperature, continentality, elevation, and longitude. Soil features and crop type had no significant effects. Higher values of species richness and Shannon diversity were found in southern areas and at higher elevations. Significant explanatory variables accounted for 11.55% of the total variation in species composition of the surveyed communities. The results are discussed and compared with those of similar studies in other Eurasian countries.

scholarly journals Species composition and similarities among anuran assemblages of forest sites in southeastern Brazil

2007 ◽  
Vol 64 (4) ◽  
pp. 364-374 ◽  
Author(s):  
Jaime Bertoluci ◽  
Ricardo Augusto Brassaloti ◽  
José Wagner Ribeiro Júnior ◽  
Vívian Maria de Faria Nasser Vilela ◽  
Henrique Oliveira Sawakuchi
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Southeastern Brazil ◽  
Neotropical Forests ◽  
Breeding Sites ◽  
Factors Affecting ◽  
Anuran Species ◽  
Forest Sites ◽  
Complementary Techniques ◽  
Data Deficient

Neotropical forests show high anuran species richness, but some Brazilian forest formations, like cerradão, semideciduous forests and restingas, remain poorly known. The composition of anuran species were determined for four forest sites belonging to different biomes in southeastern Brazil, based on two complementary techniques (visual encounter survey and survey on breeding sites), both applied simultaneously. A total of 60 anuran species belonging to eight families was recorded. Species richness and levels of endemism were higher in the Atlantic rainforest site. Sites located in the Cerrado domain were more alike than those located in the Atlantic Forest Domain. Similarity in anuran species composition was negatively correlated to the geographical distance among sites, which explains part of similarities in species composition. Factors affecting these occurrence patterns are discussed. One species (if its identity is confirmed) is considered Data Deficient by IUCN (The World Conservation Union), though it is not included in the Brazilian list of threatened amphibians. The presence of certain species with special habitats and microclimate requirements (bioindicators) suggests well-preserved ecosystems.

Effects of environmental factors on weed species composition of cereal and stubble fields in western Hungary

2010 ◽  
Vol 5 (2) ◽  
pp. 283-292 ◽  
Author(s):  
Gyula Pinke ◽  
Robert Pál ◽  
Zoltán Botta-Dukát
Keyword(s):  
Environmental Factors ◽  
Species Composition ◽  
Soil Ph ◽  
Vegetation Period ◽  
Mean Annual Precipitation ◽  
Mean Annual Temperature ◽  
Weed Species ◽  
Factors Affecting ◽  
Weed Communities ◽  
Winter Annuals

AbstractMultivariate analysis of data obtained from 184 cereal and stubble fields in low-input agricultural systems located in western Hungary was undertaken in order to asses environmental factors affecting weed species composition. For each variable, the gross and net effect on weed species composition was calculated. All variables considered in this study had a significant effect on weed species composition and explained 26.99% of the total variation. Most variation in species composition was explained by the aspect (cereal vs. stubble), followed by soil pH, mean annual precipitation, soil texture, mean annual temperature, and altitude. Separating the cereals and stubbles soil pH became the most important factor. Our results suggest that during the long vegetation period, cereal weed communities dominated by winter annuals are replaced by stubble-field weed communities dominated by summer annuals. This seasonal change may also have the same important effect on weed species composition as crop types.

Deep-Water Mysids of the Catalan Sea: Species Composition, Bathymetric and Near-Bottom Distribution

1995 ◽  
Vol 75 (1) ◽  
pp. 187-197 ◽  
Author(s):  
J.E. Cartes ◽  
J.C. Sorbe
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Water Column ◽  
Deep Water ◽  
Dominant Species ◽  
Western Mediterranean ◽  
Total Abundance ◽  
Middle Slope ◽  
First Time ◽  
Upper Slope

Deep-water suprabenthic species of Mysidacea were studied in the Catalan Sea (western Mediterranean). Twenty-one samples were taken at depths from 385 to 1859 m, using a Macer-Giroq type sledge. Sixteen mysid species have been collected. Boreomysis arctica was the commonest species and Parapseudomma calloplura, Paramblyops rostrata and Erythrops neapolitana were also notable for their high occurrence. The genus Dactylamblyops, Mysidella biscayensis and Pseudomma affine were recorded for the first time in the Mediterranean. The greatest total abundance of mysids was found over the middle slope. On the upper slope P. calloplura and E. neapolitana formed the dominant species, and deeper B. arctica dominated. Species richness and diversity (H’) declined with increasing depth. The decrease in H’ was attributable to the growing dominance of B. arctica over the middle and lower slopes. Swimming coefficients near the bottom showed intraspecific differences. In general, the species collected inhabit the water column between 0.1 and 0.5 m above the bottom. The bathypelagic species Eucopia hanseni had high swimming coefficients. Amongst the suprabenthic species, B. arctica showed the highest swimming coefficients, and rose from the near-bottom during night on the upper and middle slope stations.

scholarly journals Factors Affecting the Presence and the Diversity of Bryophytes in the Petrifying Sources Habitat (7220) in Wallonia and the Brussels-Capital Region, Belgium

2016 ◽  
Vol 2016 ◽  
pp. 1-18 ◽  
Author(s):  
J.-M. Couvreur ◽  
G. San Martin ◽  
A. Sotiaux
Keyword(s):  
Species Richness ◽  
Environmental Factors ◽  
Community Composition ◽  
Linear Models ◽  
Canopy Cover ◽  
Individual Species ◽  
Factors Affecting ◽  
The Relationship ◽  
Main Factor

Bryological composition, water chemistry, and environmental factors were characterized on 67 Belgian travertines. We explore the relationship between these environmental factors and the community composition, species richness, or presence of individual species using Redundancy Analysis with Hellinger’s transformation (tb-RDA) or Generalized Linear Models (GLMs). The best variables explaining the community composition are slope, NO3, NH4, and PO4. The species richness is negatively related to canopy cover and PO4.Palustriella commutatatends to be more frequent when the slope is steeper and to a lesser degree when the canopy cover is lower.Eucladium verticillatumtends to be slightly more frequent when canopy cover and NH4concentrations are lower.Cratoneuron filicinumis more frequent at higher Mg concentrations andPellia endiviifoliais more frequent at lower PO4concentrations and higher NO3concentrations.Brachythecium rivulareshowed wide ecological amplitude and almost none of the tested environmental factors seem to be related to its presence. The study identifies eutrophication as the main factor responsible for habitat deterioration. Practical indications on the best ways to maintain or to enhance the quality of these petrifying sources are given.

scholarly journals The Effect of Dreissena polymorpha on Bacterioplankton, Nematode Fauna and their Relations to Environmental Factors in Ogosta Reservoir (Danube Basin)

2016 ◽  
Vol 18 (1) ◽  
pp. 23-34
Author(s):  
Hristina Kalcheva ◽  
Stefan Stoichev ◽  
Mihaela Beshkova ◽  
Roumen Kalchev ◽  
Marieta Stanchkova ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Species Composition ◽  
Dissolved Oxygen ◽  
Chlorophyll A ◽  
Dreissena Polymorpha ◽  
Nematode Species ◽  
Danube Basin ◽  
Attached Bacteria ◽  
First Time ◽  
Nematode Fauna

AbstractSpatial, seasonal, and annual bacterioplankton dynamics in recently infested by the speciesDreissena polymorphaOgosta Reservoir were studied for the first time during three year period. Bacterioplankton total number was higher in spring in ecotone zones, than in summer at thermocline. NH4-N, PO4-P, turbidity, dissolved oxygen, COD and chlorophyll-a correlate positively, while transparency and Ca2+negatively with bacteria. Nematode species composition, included 22 species studied (13 rarely found andRhabditis brevispinanew for Bulgaria) belonging to nine families. TheD. polymorphaimpact is positive on nematodes and phytoplankton, negative on zooplankton and bacterioplankton, but weak positive on larger bacteria, rods and attached bacteria.

scholarly journals New distributional records for ants and the evaluation of ant species richness and endemism patterns in Mexico

2021 ◽  
Vol 9 ◽  
Author(s):  
Mario J. Aguilar-Méndez ◽  
Madai Rosas-Mejía ◽  
Miguel Vásquez-Bolaños ◽  
Gloria Angélica González-Hernández ◽  
Milan Janda
Keyword(s):  
Species Richness ◽  
Endemic Species ◽  
Service Providers ◽  
Species Number ◽  
Sampling Effort ◽  
Ecological Significance ◽  
Species Richness Estimation ◽  
Narrow Endemic ◽  
Atta Texana ◽  
First Time

Ants (Formicidae) in Mexico have usually been undersampled despite their ecological significance and their utility as environmental service providers and bioindicators. This study estimates the species richness and the narrow endemic species number of ants across Mexico. It also documents the presence of one species newly recorded in Mexico and 19 new state-based records of 14 species from central and north Mexico. No surveys have been performed in most of the localities where we report those records, suggesting the need for a higher sampling effort across the country. We present an ant species richness estimation and a narrow endemic ant species estimation in a grid of 0.5 degrees in Mexico. Stenamma schmitii is recorded for the first time from Mexico. Additionally, new state-based records of Azteca velox, Dorymyrmex insanus, Camponotus coruscus, Camponotus striatus, Formica propatula, Lasius latipes, Neivamyrmex melanocephalus, Neivamyrmex rugulosus, Syscia augustae, Atta texana, Cephalotes scutulatus, Crematogaster crinosa and Temnothorax andrei are recorded.

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