Differentiated macrophyte types as a habitat for rotifers in small mid-forest water bodies

Biologia ◽  
2009 ◽  
Vol 64 (6) ◽  
Author(s):  
Anna Basińska ◽  
Natalia Kuczyńska-Kippen
Keyword(s):  
Water Body ◽  
Catchment Area ◽  
Trophic State ◽  
Positive Relationship ◽  
Open Water ◽  
Physical Chemical ◽  
Rotifer Community ◽  
Chemical Factors ◽  
Rotifer Communities ◽  
Eutrophic Species

AbstractThe rotifer community structure may be shaped by a variety of environmental factors, including biological parameters, such as predation or competition, as well as by physical-chemical factors, among which the kind of macrophyte substratum and parameters relating to the trophic state and to the catchment area conditions are of great importance. Another impact on rotifer composition, abundance and frequency may be expected when considering differentiated macrophyte types (including helophytes, nymphaeids and elodeids) within a group of eight ponds located within a mid-forest catchment area, which was the main aim of the present study. Detailed analysis on the participation of indicator eutrophic rotifer species provided an additional goal of this investigation in order to qualify the trophic state of this kind of water body located within the Wielkopolska region, in the central western part of Poland.The presence of 117 taxa, including 7 species that are rare or infrequently distributed in the Polish fauna was recorded. The number of taxa and rotifer abundance differed greatly in respect to the specific water body and to the type of substratum. The vegetated zones dominated by elodeids were characterised by the most various and most abundant rotifer communities as well as by the highest values of the Shannon-Weaver index. This reflects a positive relationship between the heterogeneity of habitat and the structure of rotifer communities. It was also found that helophytes and the open water zone possessed the highest, while elodeids the lowest percentage of eutrophic species.

Ecological and geographical variations in the siphonal index of Culex pipiens larvae (Diptera: Culicidae)

1996 ◽  
Vol 86 (3) ◽  
pp. 281-287 ◽  
Author(s):  
E.B. Vinogradova ◽  
S.Ya. Reznik ◽  
E.S. Kuprijanova
Keyword(s):  
Water Body ◽  
Culex Pipiens ◽  
Open Water ◽  
Published Data ◽  
Strongly Correlated ◽  
Reproductive Diapause ◽  
Body Type ◽  
Underground Waters ◽  
Geographical Variations ◽  
The Mean

AbstractCulex pipiens Linnaeus is represented by two forms: the form molestus which is autogenous, stenagamous and has no reproductive diapause, and the form pipiens which is anautogenous, eurygamous and diapauses. The ecological, physiological and geographical variations in the larval siphonal index of C. pipiens (the ratio of the length of the siphon to its width at the base) was investigated using both original measurements and previously published data. In all, data were used from 259 collections from open water bodies (marshes, ditches, holes, barrels, etc.) and underground waters (house basements) in areas of Europe, Asia and part of Africa. Autogeny was studied in some cases by dissection of females. In C. pipiens the mean siphonal index was strongly correlated with ecology (water body type) and adult physiology (autogeny). In spite of high geographical and individual variation, which makes the identification of individual larvae difficult, the mean siphonal index can be used with certainty for the differentiation of populations of the two forms of C. pipiens.

Characteristics of Phytoplankton Community Structure and Evaluation of Trophic State of Water Body in Bosten Lake

2013 ◽  
Vol 864-867 ◽  
pp. 422-427 ◽  
Author(s):  
Xing Mu ◽  
Fang Wang ◽  
He Ying Sun ◽  
Li Min Chu ◽  
Jia Li Wang
Keyword(s):  
Community Structure ◽  
Water Body ◽  
Trophic State ◽  
Diversity Index ◽  
Bosten Lake ◽  
Wiener Diversity Index ◽  
State Of Water ◽  
Synedra Acus ◽  
The Mean ◽  
Richness Index

Bosten Lake was the largest inland freshwater lake in China. It is facing with a series of ecological problems nowadays. The phytoplankton and water samples of seventeen sampling sites in Bosten Lake were collected in September 2012. Results show that sixty-four species (genera) of phytoplankton, which belong to six phyla, are identified. The community structure of phytoplankton is dominated by Chlorophyta. The mean cell density of phytoplankton in whole lake is 8179.01×104cells·L-1 and Cyanophyta accounts for 94.71%. The dominant species are Chroococcus sp. and Synedra acus. In terms of Shannon-Wiener diversity index, Margalef richness index, Pielou evenness index and total nitrogen content, it is ascertained that trophic state of water body in Estuary and Pumping Station is between mesotrophication and eutrophication. While in the other districts, the water body is eutrophic. In addition, the eutrophic degree of water body in District IV is higher.

Environmental flows and recruitment of walleye (Sander vitreus) in the Peace–Athabasca Delta

2013 ◽  
Vol 70 (2) ◽  
pp. 307-315 ◽  
Author(s):  
Andrew J. Paul
Keyword(s):  
River Discharge ◽  
Positive Relationship ◽  
Environmental Flows ◽  
A Priori ◽  
Null Model ◽  
Open Water ◽  
Sander Vitreus ◽  
Theoretic Approach ◽  
Nutrient Inputs ◽  
Athabasca River

Age composition data from a commercial walleye (Sander vitreus) fishery in the Peace–Athabasca Delta were used to test the hypotheses that recruitment varied interannually and that recruitment was related to local hydrological conditions. Variable interannual recruitment was strongly supported over a null model of constant annual recruitment. Assuming recruitment strength was established in a walleye's first year of life, several a priori hypotheses relating recruitment to river discharge or lake levels were tested using an information–theoretic approach. The data best supported the hypothesis of a positive relationship between walleye recruitment and mean discharge in the Athabasca River during the fry rearing period (weeks 18–43). Approximately 25% of observed variability in annual recruitment could be explained by mean discharge during the fry period. However, the data could not fully rule out the alternate hypotheses that recruitment was related to mean discharge in the Athabasca River over the entire year or during winter. Several mechanisms are hypothesized to explain the positive relationship, including increased space in preferred open-water habitat or greater food production from nutrient inputs or wetted area. The observed correlation between river discharge and walleye recruitment can be used to help us understand water management planning on the Athabasca River.

Physical Chemical Factors in Bond Strength in Multiply Vulcanized Articles

1960 ◽  
Vol 33 (2) ◽  
pp. 545-555
Author(s):  
B. A. Dogadkin
Keyword(s):  
Bond Strength ◽  
Experimental Work ◽  
Physical Chemical ◽  
Chemical Factors ◽  
Service Conditions ◽  
Research Institute

Abstract Bond strength between the components of multiply articles in the vulcanized state depends on many factors which make themselves evident in the various stages of manufacture of the articles as well as under service conditions. In the present paper we shall give a description of the main physical chemical factors which were revealed in the course of experimental work in the physics and chemistry divisions of the Tire Research Institute, mainly in 1951 to 1953.

scholarly journals DISTRIBUSI LONGITUDINAL DAN STRUKTUR POPULASI Rasbora spp. DI SUNGAI BANJARAN KABUPATEN BANYUMAS

2014 ◽  
Vol 1 (2) ◽  
pp. 167
Author(s):  
Titis Amelia ◽  
Windiariani Lestari ◽  
Agus Nuryanto
Keyword(s):  
Body Weight ◽  
Population Structure ◽  
Species Richness ◽  
The Body ◽  
Longitudinal Distribution ◽  
Running Water ◽  
Total Length ◽  
Physical Chemical ◽  
Chemical Factors ◽  
Species Richness And Abundance

Rasbora is a genus of freshwater fish of the family Cyprinidae. Three species belonging to this genus were found in Java Island; R. aprotaenia, R. lateristriata, and R. argyrotaenia. Rasbora inhabits clear running water with sandy and gravel bottom. This study aimed to determine the longitudinal distribution of Rasbora spp. based on their species richness and abundance at Banjaran River; to determine the population structure of Rasbora spp based on their body weight, standard and total length; and to identify interactions between physical-chemical factors with species richness and abundance of Rasbora spp. This research was a survey, with purposive random sampling technique applied to collect samples. The research divided the study sites into five stations based on their altitude and topography. The Cluster Analysis was calculated based on species richness and relative abundance of Rasbora spp., while the longitudinal distribution and the population structure were presented descriptively. The interaction between the physical-chemical factors and the species richness and abundance of Rasbora were analyzed using Principal Component Analysis (PCA). Thi study found two species of Rasbora, namely Rasbora argyrotaenia and Rasbora lateristriata with 80 and 2 individuals respectively. R. argyrotaenia was distributed longitudinally along Banjaran River. Meanwhile, R. latestriata was only found at the upstream. Based on the body weight, the population of R. argyrotaenia at the station three were found highest by the average body weight of 1–6 gr of a total 31 individuals. The maximum measurements of the standard length were observed at the station 3 with a range of diameter 4.0–5.9 cm of 30 individuals. The total length were also found at the station 3 with a range of measuremtnt 5.0–7.9 cm of 33 individuals. R. latestriata was found only two individual with body weights measured were 9 gr and 10 gr, the standard lengths were 7.6 and 8.5 cm, and the total lengths were 9.5 and 10.5 cm. The distribution of R. argyrotaenia was influenced mostly by pH, the speed of the water, and DO. The presence of R. lateristriata was influenced primarily by BOD and depth.

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