The relative abundance of Mortierella Coemans spp. in acid heath soils

1957 ◽  
Vol 5 (1) ◽  
pp. 36 ◽  
Author(s):  
EI McLennan ◽  
SC Ducker
Keyword(s):  
Relative Abundance ◽  
Species Distribution ◽  
Dominant Species ◽  
Local Effect ◽  
Soil Types ◽  
Fungal Population ◽  
Marked Contrast ◽  
Parallel Result ◽  
Analysis Of Results

The fungal population of two podzolized heath soils, one with and one without a hardpan, is characterized by a marked contrast in the species distribution of the genus Mortierella Linnemann.The dominant species in the hardpan soil is Mortierella ramanrniana (Möll) Linnemann, but when the pan is lacking it is replaced by Mortierella nana Linnemann. This is not a local effect, for an analysis of results from comparable English soils gives a parallel result. It can be stated that the dominance of one or other of these species is indicative of certain soil types.

Aquatic and semi aquatic Hemiptera community of Sonebeel, the largest wetland of Assam, northeastern India

2018 ◽  
Vol 10 (13) ◽  
pp. 12792-12799
Author(s):  
Anupama Saha ◽  
Susmita Gupta
Keyword(s):  
Species Richness ◽  
Pest Control ◽  
Relative Abundance ◽  
Species Distribution ◽  
Diversity Indices ◽  
Environmental Data ◽  
Northeastern India ◽  
Ecological Roles

Aquatic and semiaquatic Hemiptera bugs play significant ecological roles, and they are important indicators and pest control agents.  Little information is currently available concerning its populations in southern Assam.  This study assessed hemipterans in four sites of Sonebeel, the largest wetland in Assam (3458.12 ha at full storage level), situated in Karimganj District.  The major inflow and outflow of the wetland are the rivers Singla and Kachua, respectively (the Kachua drains into the Kushiyara River).  Samples were trapped with pond nets and were seasonally recorded.  This study recorded a total of 28 species of aquatic and semiaquatic hemipterans belonging to 20 genera under nine families.  Population, geographical and environmental data (e.g., rainfall) were used to assess the relative abundance of species, species richness and different diversity indices, and species distribution. 

Parasitoid spectrum of Acyrthosiphon-aphids in Central Asia (Hymenoptera: Aphidiidae)

1978 ◽  
Vol 9 (2) ◽  
pp. 140-145 ◽  
Author(s):  
Dan González ◽  
Petr Stary
Keyword(s):  
Central Asia ◽  
Host Range ◽  
Relative Abundance ◽  
Species Distribution ◽  
Acyrthosiphon Pisum ◽  
Vertical Zonation

AbstractThe spectrum of parasitoids (namely of Acyrthosiphon pisum Harris and A. gossypii Mordw.) is reviewed with respect to the host range of the particular species. Distribution of parasitoids is analysed with respect to the vertical zonation and corresponding changes in host range and relative abundance of the species. Monoctonus tianshanensis n.sp. (from Amphorophora rubi Kalt. and Impatientinum asiaticum Nevs.) and Aphidius popovi n.sp. (from Amphorophora catharinae Nevs.) are described.

Regulation of intestinal lipid metabolism by fusion-induced fatty liver based on graphene oxide nanopore DNA

2020 ◽  
Vol 10 (6) ◽  
pp. 802-811
Author(s):  
Gemin Xiao ◽  
Hong Shi ◽  
Jiongshan Zhang ◽  
Mei Liao ◽  
Wenhai Guo ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Lipid Metabolism ◽  
Fatty Liver ◽  
Relative Abundance ◽  
Species Distribution ◽  
Normal Population ◽  
Fat Metabolism ◽  
Intestinal Flora ◽  
Alpha Diversity ◽  
Distribution Analysis

The regulation of glucose and lipid metabolism by intestinal microorganisms is closely related to the occurrence of fatty liver. In order to explore the relationship between the distribution of intestinal flora and the occurrence of fatty liver, we extracted fecal DNA from normal people (group C) and patients with fatty liver (group D), sequenced the collected samples with graphene oxide (GO) nano-solid nanopore, and sequenced the V3 and V4 regions of 16S. After screening the sequencing data, all tag sequences of all samples were clustered according to operational taxonomic units (OTUs) using UPARSE 9 software. After determining abundance of OTUs and species annotation of the sequencing results, alpha diversity was analyzed based on an OTU abundance table. Krona (V2.6) 18 software displayed the results of species annotation in an interactive and visual way, and species distribution among groups was compared. The LEfSe method was used to analyze the differences of species distribution among components. After cluster analysis, the number of OTUs in the normal population was 512, the number of intestinal species in fatty liver patients was 541, of which 262 were common species. Alpha diversity analysis revealed reduced relative abundance in the fatty liver patients. The abundance of phylum, class, order, family, genus, and species in each group were compared. The abundance of Pachytene and Proteus increased abnormally and the relative abundance of Clostridium decreased. In addition, the abundance of Enterobacteriaceae in Enterobacteriaceae and Fusobacteria in Fusobacteria decreased. The relative abundance of Bacteroidea, Bacteroideae, and Lachnospiraceae increased. The results of species distribution analysis confirmed that the difference of Fusicantibacter distribution in Lachnospiraceae was significant. Functional analysis of the distribution of the flora revealed the principle role of the flora in fat metabolism. Therefore, it was concluded that Fusicantibacter was the dominant flora in patients with fatty liver, which promoted the formation of fatty liver by enhancing fat metabolism. The findings also demonstrated that GO nanopores can be used for DNA sequencing.

Species diversity, community structure and distribution of phytoplankton in the Changjiang estuary during dry and flood periods

2013 ◽  
Vol 94 (3) ◽  
pp. 459-472 ◽  
Author(s):  
P.Y. Guo ◽  
H.T. Shen ◽  
J.H. Wang
Keyword(s):  
Surface Layer ◽  
Community Structure ◽  
Species Diversity ◽  
Species Distribution ◽  
Dominant Species ◽  
Changjiang Estuary ◽  
Freshwater Species ◽  
Phytoplankton Species ◽  
Dry Period ◽  
Flood Period

This paper reports on the phytoplankton community, its composition, structure and distribution in Changjiang estuary from February 1999 to March 2000. Two hundred and eight species were identified in the dry and flood periods. Diatoms, with 143 species observed, was the most abundant phytoplankton group, accounting for 68.75% of the total phytoplankton species number. Skeletonema costatum was dominant among all the species. The phytoplankton of Changjiang estuary in China was divided into five ecological categories: freshwater species, estuary brackish water species, inshore low salinity species, inshore widespread species and off-sea high salinity species. During the dry period, the major phytoplankton populations in the surface layer were estuary inshore and offshore populations, distinguished from the composition of the bottom layer. The community structure was similar in the two layers during the flood period. The phytoplankton species diversity was calculated for Simpson, Shannon–Weaver diversity and evenness indices, and found to be higher in the dry period, due to the simple dominant species and low spatial heterogeneity in the flood period. Higher phytoplankton abundance was observed in the surface layer during the flood period. The phytoplankton species distribution, coinciding with the dominant species distribution, varied with salinity, and their abundance correlated significantly with nutrients and light.

Populations and host-plant preferences of Earias spp. (Lepidoptera, Noctuidae) in East Africa

1974 ◽  
Vol 64 (1) ◽  
pp. 33-44 ◽  
Author(s):  
W. Reed
Keyword(s):  
Host Plant ◽  
East Africa ◽  
Rainy Season ◽  
Dominant Species ◽  
Soil Types ◽  
Alternative Host ◽  
Undescribed Species ◽  
Farming Practices ◽  
Lepidoptera Noctuidae ◽  
Western Tanzania

AbstractIn this ecological survey conducted mainly in western Tanzania between 1962 and 1969, six species of Earias were found, including two undescribed species and E. cupreoviridis (Wlk.), which is restricted to Sida spp.; E. biplaga (Wlk.) and E. insulana (Boisd.) were the only species found on cotton and were virtually restricted to Malvales. Differences in the incidence of Malvales and the Earias larvae feeding on them were noted on a research farm and on surrounding local farms as being due to different farming practices and soil types. E. biplaga was the dominant species on cotton for most of each year and its major alternative host was Waltheria indica; E. insulana was relatively more common on cotton in the dry season and was particularly common on Abutilon spp. Populations of E. biplaga increased on W. indica early in the rainy season, then dispersed onto cotton; populations on cotton could be predicted from the size of earlier populations on W. indica and subsequent rainfall.

Dominant Species and Diversity: Linking Relative Abundance to Controls of Species Establishment

2009 ◽  
Vol 174 (6) ◽  
pp. 850-862 ◽  
Author(s):  
Benjamin Gilbert ◽  
Roy Turkington ◽  
Diane S. Srivastava
Keyword(s):  
Relative Abundance ◽  
Dominant Species ◽  
Species Establishment

Abundance of some native coccinellines (Coleoptera: Coccinellidae) before and after the appearance of Coccinella septempunctata

2003 ◽  
Vol 135 (3) ◽  
pp. 391-404 ◽  
Author(s):  
W.J. Turnock ◽  
I.L. Wise ◽  
F.O. Matheson
Keyword(s):  
Relative Abundance ◽  
Dominant Species ◽  
Coccinella Septempunctata ◽  
Abundant Species ◽  
Competitive Displacement ◽  
Field Crops ◽  
Transect Sampling ◽  
Visual Sampling ◽  
Before And After ◽  
The Mean

AbstractThe seven-spotted lady beetle, Coccinella septempunctata L., was first reported in Manitoba in 1988. The effect of this introduced species on the relative abundance of the more common native coccinellines was determined from D-Vac Insect Net® and sweepnet samples in alfalfa in 1983–2001, by sweepnet and visual sampling in field crops and other vegetation in 1989–2001, and by transect sampling of aggregations of coccinellines in spring and autumn on the shore of Lake Manitoba from 1989 to 2001. The trends of annual changes in the abundance of six species in southern Manitoba were similar, whether based on the mean density per 200 sweeps in alfalfa or on their relative abundance in alfalfa, on other vegetation, and in aggregations on the beach. Before 1988, Hippodamia tredecempunctata tibialis (Say), Coccinella transversoguttata richardsonii Brown, and Hippodamia convergens Guerin were the most abundant species, followed by Hippodamia parenthesis (Say) and Coccinella trifasciata perplexa Mulsant. By 1992, C. septempunctata had become the dominant species, but H. tredecempunctata has since been the dominant species in most collections. The relative abundance of C. transverso guttata, H. convergens, H. parenthesis, and C. trifasciata has decreased since the establishment of C. septempunctata. The decline in abundance of these species seems to be caused by their competitive displacement by C. septempunctata. Their displacement also might be a contributing factor in the slight increase in abundance of H. tredecempunctata because C. septempunctata may compete less directly with this species than with other native coccinellines.

Summer zooplankton distributions at the surface of the outer Bay of Fundy, eastern Canada

1989 ◽  
Vol 67 (11) ◽  
pp. 2725-2730 ◽  
Author(s):  
R. G. B. Brown ◽  
D. E. Gaskin
Keyword(s):  
Nova Scotia ◽  
New Brunswick ◽  
Water Column ◽  
Relative Abundance ◽  
Dominant Species ◽  
Calanus Finmarchicus ◽  
Bay Of Fundy ◽  
Eastern Canada

Copepods and cladocerans were collected, mainly in August, from the top 0.25 m of the water column in the outer Bay of Fundy, off Brier Island, Nova Scotia (ca. 44°15′N, 66°23′W) in 1975–1978, Deer Island, New Brunswick (ca. 45°00′N, 67°00′W) in 1977–1978, and Grand Manan Island, New Brunswick (ca. 44°40′N, 66°43′W) in 1981. In 1975–1977, the dominant species at the surface off Brier Island were stage CIV-I Calanus finmarchicus and CVI-V Pseudocalanus sp. The copepods Acartia spp., Anomalocera pattersonii, Centropages sp., Eurytemora spp., and Oithonia similis and the cladocerans Evadne sp. and Podon sp. also occurred regularly. The relative abundance of Calanus finmarchicus declined during the period July–October 1976, though the proportion of stages CVI-V increased. The relative proportions of Pseudocalanus sp., and of its stages CVI-V, both declined during the same period. The community at the surface was similar to that collected in other studies from subsurface tows in the Bay of Fundy as a whole, including Brier, Deer, and Grand Manan islands. This was not true of Brier Island in 1978: CVI-V Calanus finmarchicus predominated, and other species were scarce. Our samples from Deer and Grand Manan islands resembled those from Brier Island in 1978, though CVI-V Calanus finmarchicus predominated even more strongly. We discuss the differences between our samples from Brier Island in 1978 and 1975–1977, and between the latter and our New Brunswick data. However, there is no obvious explanation for most of these anomalies.

scholarly journals Diversity and population dynamics of Odonata (Insecta: Odonata) in rice growing area of central Gujarat

2017 ◽  
Vol 30 (3) ◽  
pp. 149
Author(s):  
V. B. Rohmare ◽  
Darshana M. Rathod ◽  
B. M. Parasharya
Keyword(s):  
Population Dynamics ◽  
Community Structure ◽  
Relative Abundance ◽  
Paddy Field ◽  
Dominant Species ◽  
Diversity Index ◽  
Fish Farm ◽  
Paddy Fields ◽  
Point Count ◽  
Point Count Method

Odonates diversity was studied in Paddy field of central Gujarat during 2012 to 2015. Total 39 species belonging to 25 genera, under six families and two suborders were recorded. Total 17 species of Zygoptera (damselflies) and 22 species of Anisoptera (dragonflies) were recorded. Community structure and population dynamics of adult odonates were studied at Lingda village during July to December, 2012 through monitoring their population by point count method on three microhabitats (paddy field, village pond and fish farm). Total seventeen species were encounterd in the point count. Diversity index (H’) was highest (2.13) for paddy fields followed by fish farm (2.07) and village pond (1.99). Evenness value of the odonates also ranged between 0.7 and 0.8. Total four species (<em>Viz.</em> Ditch Jewel (25.0%), Green Marsh Hawk (17%), Ruddy Marsh Skimmer and Coromandal Marsh Dart (16% each) were dominant species in all three microhabitats. Both the suborders Anisoptera (dragonfly) and Zygoptera (damselfly) showed similar trend of population fluctuation during the study. Relative abundance was higher and remained constant during 4<sup>th</sup> week of September to 2<sup>nd</sup> week of October.

scholarly journals Seasonal species distribution and dominance in grazed Terai grassland of Budhanagar, Nepal

2014 ◽  
Vol 4 (1) ◽  
pp. 29-33
Author(s):  
Bhabindra Niroula ◽  
Sasinath Jha
Keyword(s):  
Species Distribution ◽  
Dominant Species ◽  
Winter Season ◽  
Summer Season ◽  
Seasonal Distribution ◽  
Herbaceous Species ◽  
Community Biomass ◽  
Percent Contribution ◽  
Total Community ◽  
Grazed Grassland

Assessment of seasonal distribution and dominancy of herbaceous species of a grazed grassland of Budhanagar, eastern Terai region of Nepal was carried out in 2010. A total of 33 species: grasses (10), sedges (5), legumes (4) and non- legumes (14) were recorded with distinct seasonal occurrence. Most dominant species throughout the year were:  Chrysopogon aciculatus (biomass 91.0-1720.5 g/m2; IVI 78.8-99.8 ); Desmodium triflorum  (biomass 30-679.3 g/m2; IVI 13.8-41.7) and Imperata cylindrical ( biomass 12.0-83.3  g/m2;  IVI 20.7-34.6). Maximum total community biomass (3650.7 ± 19.1 g/m2) was recorded in rainy and minimum (175.0 ± 4.1 g/m2) in summer season. Maximum percent contribution by biomass and IVI of grasses was in winter season (90.3 and 76.2); sedges (17.1 and 19.0) and legume (12.6 and 15.0) in rainy season and that of non-legume in summer season (7.5 and 15.7) to the total community biomass and IVI, respectively.

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