Fulgoromorpha and Cicadomorpha (Hemiptera) infesting bracken (Pteridium aquilinum)

2011 ◽  
Vol 80 (3) ◽  
pp. 451-456
Author(s):  
Aleksandra Halarewicz
Keyword(s):  
Population Dynamics ◽  
Dominant Species ◽  
Pteridium Aquilinum ◽  
Ecological Characteristics ◽  
Sw Poland

Fulgoromorpha and Cicadomorpha (Hemiptera) infesting bracken (Pteridium aquilinum) The abundance of six species of leafhoppers and planthoppers infesting bracken Pteridium aquilinum was determined in SW Poland. The paper describes the insects associated with the plant on the basis of their ecological characteristics. The population dynamics of the dominant species Ditropis pteridis Spinola (Delphacidae) is plotted.

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 Population dynamics and species composition of maize field parasitoids attacking aphids in northeastern China

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0241530
Author(s):  
Ying Zhang ◽  
Min-chi Zhao ◽  
Jia Cheng ◽  
Shuo Liu ◽  
Hai-bin Yuan
Keyword(s):  
Population Dynamics ◽  
Species Composition ◽  
Natural Enemies ◽  
Dominant Species ◽  
Aphis Gossypii ◽  
Northeastern China ◽  
Jilin Province ◽  
Limited Information ◽  
Peak Period ◽  
Parasitism Rates

Maize, Zea mays L., is the most abundant field crop in China. Aphids are the most economically damaging pest on maize, particularly in the maize agri-ecosystems of Jilin Province, northeastern China. Parasitic wasps are important natural enemies of aphids, but limited information exists about their species composition, richness and seasonal dynamics in northeastern China. In this study, the population dynamics of maize aphids and parasitoid wasps were assessed in relation to each other during the summer seasons of two consecutive years, 2018 and 2019. We selected maize fields in the Changchun, Songyuan, Huinan and Gongzhuling areas of Jilin Province. Four species of aphids were recorded from these maize fields: Rhopalosiphum padi (L), Rhopalosiphum maidis (Fitch), Aphis gossypii Glover and Macrosiphum miscanthi (Takahashi). The dominant species in each of the four areas were R. maids (Filch) and R. padi in Changchun, R. padi in Songyuan, A. gossypii and R. padi in Huinan, and A.gossypii and R. padi in Gongzhuling. We delineated a species complex made up of primary parasitoids and hyperparasitoids associated with maize aphids. The primary parasitoids Lysiphlebus testaceipes, Binodoxys communis and Aphelinus albipodus together formed approximately 85.3% of the parasitoid complex. Pachyneuron aphidis, Phaenoglyphis villosa, Syrphophagus taeniatus and Asaphes suspensus made up the hyperparasitoids. Of the primary parasitoids, L. testaceipes was the dominant species (81.31%). Of the hyperparasitoid group, P. villosa was the dominant species (68.42%). Parasitism rates followed the fluctuation of the aphid population. The highest parasitic rate was observed during the peak period of cotton aphids. In this paper, the occurrence dynamics and dominant species of aphids and the dynamics of parasitic natural enemies of aphids in maize fields in Jilin Province are, for the first time, systematically reported. This study provides important information for the establishment and promotion of aphid biological control in maize fields.

scholarly journals Population Dynamics of Intermediate-Host Snails in the White Nile River, Sudan: A Year-Round Observational Descriptive Study

2021 ◽  
Vol 59 (2) ◽  
pp. 121-129
Author(s):  
Hassan A. H. A. Ismail ◽  
Abed el Aziz A. el R. M. Ahmed ◽  
Young-Ha Lee ◽  
Mousab Siddig Elhag ◽  
Youngjin Kim ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Vegetation Coverage ◽  
Nile River ◽  
Snail Population ◽  
Infection Rates ◽  
Intermediate Hosts ◽  
Biomphalaria Pfeifferi ◽  
Bulinus Truncatus ◽  
Ecological Characteristics ◽  
White Nile

We aimed to explore the population dynamics of snail in 3 sites of the White Nile in Sudan. More specifically, we aimed to investigate the annual patterns of snail populations that act as intermediate hosts of schistosomes and monthly snail infection rates and ecological characteristics presumably related to snail populations. We collected snails for 1 year monthly at 3 different shore sites in the vicinity of El Shajara along the White Nile river in Khartoum State, Sudan. In addition, we measured air and water temperatures, water turbidities, vegetation coverages, and water depths and current speeds. Most of the collected snails were <i>Biomphalaria pfeifferi</i> and <i>Bulinus truncatus</i>. The population densities of snails and their infection rates varied across survey sites. The collected snails liberated <i>S. mansoni</i> and <i>S. haematobium</i> cercariae as well as Amphistome and Echinostome cercariae. Infected snails were found during March-June. The ecological characteristics found to be associated with the absence of snails population were: high turbidity, deep water, low vegetation coverage (near absence of vegetation), high water temperature, and high current speed. To our knowledge, this is the first longitudinal study of the snail population and ecological characteristics in the main basin of the White Nile river.

scholarly journals LA VEGETACION MARINA DEL PARQUE NACIONAL TAYRONA, COSTA CARIBE COLOMBIANA, II: TIPOS DE VEGETACION

2016 ◽  
Vol 13 ◽  
Author(s):  
Germán E. Márquez C. ◽  
Gabriel Guillot M.
Keyword(s):  
Rainy Season ◽  
Dominant Species ◽  
Vegetation Type ◽  
Vegetation Types ◽  
Ecological Analysis ◽  
Spatial Complexity ◽  
Irregular Distribution ◽  
Ecological Characteristics ◽  
Circulation Patterns ◽  
Zonation Patterns

The benthic marine vegetation of the Parque Nacional Tayrona, Caribbean Coast of Colombia, II: Vegetation types. The benthic marine vegetation types of the littoral of the Parque Nacional Tayrona (Magdalena Department, Colombia) were studied during the rainy season. The methods used were modified from terrestrial phytosociology; appraisals of abundance and presence were made according to Braun-Blanquet (1965). Vegetation types are vertically distributed following the zonation patterns in each of the habitats studied: rocky, sandy-rocky and sandy-muddy. Habitats are divided according to the degree of surf exposure. The name of each vegetation type is that of the dominant species; a dominant species is considered to be the most outstanding one. 31 vegetation types have been described their distribution along the littoral in function of the ecological characteristics has been studied based on this description, the spatial complexity of the Tayrona littoral is great, as expresed by the irregular distribution of the species and vegetation types. The ecological characteristics of different areas of the Tayrona littoral, specially the bays ofChengue, Gayraca and Nenguange and the Cañaveral and Arrecifes sector, are analized and compared. The spatial complexity is atributed to oceanographic causes, specially the circulation patterns in the bays; Chengue is considered to have the most peculiar vegetation. Some considerations about the methods used and its convenience in ecological analysis are made.

scholarly journals Dominant species determine ecosystem stability across scales in Inner Mongolian grassland

2021 ◽  
Author(s):  
Yonghui Wang ◽  
Shao-Peng Wang ◽  
Liqing Zhao ◽  
Cunzhu Liang ◽  
Bailing Miao ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Dominant Species ◽  
Large Scale ◽  
Climatic Factors ◽  
Spatial Scales ◽  
Temporal Stability ◽  
Well Being ◽  
Local Communities ◽  
Large Spatial Scale ◽  
Mongolian Grassland

There is an urgent need to extend knowledge on ecosystem temporal stability to larger spatial scales because presently available local-scale studies generally do not provide effective guide for management and conservation decisions at the level of an entire region with diverse plant communities. We investigated temporal stability of plant biomass production across spatial scales and hierarchical levels of community organization and analyzed impacts of dominant species, species diversity and climatic factors using a multi-site survey of Inner Mongolian grassland. We found that temporal stability at a large spatial scale, i.e. a large area aggregating multiple local communities, was related to temporal stability of and asynchrony among spatially separated local communities and large-scale population dynamics of dominant species, yet not to species richness. Additionally, a lower mean and higher variation of yearly precipitation destabilized communities at local and large scales by destabilizing dominant species population dynamics. We argue that, for semi-arid temperate grassland, dynamics and precipitation responses of dominant species and asynchrony among local communities stabilize ecosystems at large spatial scales. Our results indicate that reduced amounts and increased variation of precipitation may present key threats to the sustainable provision of biological products and services to human well-being in this region.

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