Contribution to the limnological knowledge of the Salada Grande Lagoon: 2. Plankton seasonal variations and some correlations with physical-chemical factors

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.

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Seasonal variations of phytoplankton community structure in relation to physico-chemical factors in Lake Baiyangdian, China

Procedia Environmental Sciences ◽

10.1016/j.proenv.2010.10.173 ◽

2010 ◽

Vol 2 ◽

pp. 1622-1631 ◽

Cited By ~ 23

Author(s):

Cunqi Liu ◽

Lusan Liu ◽

Huitao Shen

Keyword(s):

Community Structure ◽

Seasonal Variations ◽

Phytoplankton Community ◽

Phytoplankton Community Structure ◽

Physico Chemical ◽

Chemical Factors ◽

Lake Baiyangdian

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Physical Chemical Factors in Bond Strength in Multiply Vulcanized Articles

Rubber Chemistry and Technology ◽

10.5254/1.3542173 ◽

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.

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Physical-Chemical Factors Affecting the Preparation of a Coarse Solid Dispersion by Crystallization of Indowhacin from a Metastable Solid Solution

Drug Development Communications ◽

10.3109/03639047609051904 ◽

1976 ◽

Vol 2 (4-5) ◽

pp. 359-376 ◽

Cited By ~ 3

Author(s):

J. C. Saboe ◽

R. E. Dempski

Keyword(s):

Solid Solution ◽

Solid Dispersion ◽

Metastable Solid Solution ◽

Factors Affecting ◽

Physical Chemical ◽

Chemical Factors

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

Scripta Biologica ◽

10.20884/1.sb.2014.1.2.450 ◽

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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Community Structure of Gastropods in Seagrass Meadows at Coastal Area of Nusi and Gersen, Nabire Regency

JURNAL SUMBERDAYA AKUATIK INDOPASIFIK ◽

10.46252/jsai-fpik-unipa.2019.vol.3.no.2.72 ◽

2020 ◽

pp. 89

Author(s):

Marce Souisa ◽

Simon P. Leatemia ◽

Selfanie Talakua

Keyword(s):

Coastal Waters ◽

Diversity Index ◽

Similarity Index ◽

Seagrass Habitat ◽

Dominance Index ◽

Seagrass Meadows ◽

Physical Chemical ◽

Seagrass Ecosystem ◽

Measurement Results ◽

Chemical Factors

Gastropods plays an important role in the food chain on seagrass ecosystem and its existence are depend on the physical-chemical factors in the seagrass ecosystem. This study aims to determine the density and diversity of gastropods associated in seagrass habitat in Nusi and Gersen coastal waters. The measurement results of some physical-chemical waters variables, are still quite good for the life of gastropods. Species composition of gastropod in Nusi at higher than at the Gersen, but instead of individual density in Gersen more higher than Nusi. Diversity index of gastropods at Nusi station is higher (3,757) than Gersen (3.053), on the contrary the eveness and dominance index are higher at Gersen station than Nusi station. Community similarity index by species is low between the two stations, which indicates that the species of gastropods at both stations is quite different. The influence of human activity and higher utilizatin of gastropods in Nusi has lowered the density of gastropods in seagrass habitat, so it needs awareness efforts on the importance of gastropods and the seagrass habitat for coastal ecosystem.

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