Seasonal variations of rotifer communities in three climatic zones: effects of environmental parameters on changes of functional groups

Limnology ◽  
2021 ◽  
Author(s):  
Fang-Ping Qian ◽  
Xin-Li Wen ◽  
Yi-Long Xi
Keyword(s):  
Functional Groups ◽  
Seasonal Variations ◽  
Environmental Parameters ◽  
Climatic Zones ◽  
Rotifer Communities

Phytoplankton functional groups response to environmental parameters in Muling River basin of northeast China

2019 ◽  
Vol 55 ◽  
pp. 17
Author(s):  
Xu Sun ◽  
Patteson Chula Mwagona ◽  
Isaac Ekyamba Shabani ◽  
Wenjiu Hou ◽  
Xiaoyu Li ◽  
...  
Keyword(s):  
Functional Groups ◽  
River Basin ◽  
Light Availability ◽  
Seasonal Succession ◽  
Environmental Parameters ◽  
N:P Ratio ◽  
Ammonium Nitrogen ◽  
Nutrient Concentrations ◽  
Phytoplankton Functional Groups

The present study was carried out in the biggest tributary of Ussuri River of boundary between China and Russia. The Muling River basin has undergone a long-term dredging works, and waterbody became seriously turbid. The succession of phytoplankton functional groups succession and environmental factors in the river were sampled in 2015. We totally identified 83 species, belonging to 17 functional groups which 5 were predominant, including group F, M, MP, P and Y. The seasonal succession of phytoplankton functional groups was M/P-F/MP/P-MP/P. Results of Spearman correlation analysis and canonical correspondence analysis (CCA) revealed that phytoplankton functional groups were mainly influenced by nutrient concentrations and light availability including total nitrogen (TN), ammonium nitrogen (NH4+–N), nitrate nitrogen (NO3−–N), N:P ratio (N:P), water depth (D) and transparency (SD) in the basin.

Temporal fluctuations of the phytoplankton community in an isolated floodplain lake (North Mollaköy Lake) of the Sakarya River (Northern Turkey)

2014 ◽  
Vol 43 (4) ◽  
Author(s):  
Tuğba Sevindik ◽  
Hatice Tunca ◽  
Burçin Önem ◽  
Sevil Tamer
Keyword(s):  
Functional Groups ◽  
Phytoplankton Biomass ◽  
Water Discharge ◽  
Temporal Distribution ◽  
Hydrological Regime ◽  
Environmental Parameters ◽  
Spatial And Temporal Variation ◽  
Floodplain Lake ◽  
Sakarya River ◽  
T1 And T2

AbstractThe aim of this study was to determine the spatial and temporal variation of phytoplankton and water quality in response to the hydrological regime in an isolated floodplain lake (North Mollaköy Lake) of the Sakarya River. Variations in the composition, biomass and functional groups of phytoplankton and environmental parameters were monthly analyzed in sub-surface samples collected from the pelagic zone at four stations from July 2012 to June 2013. A total of 109 taxa were identified, and the species which contributed the most to the phytoplankton biomass were grouped into 14 functional groups (FGs). The distribution of FGs was linked to the transition (T1 and T2), high (HW) and low (LW) water periods in North Mollaköy Lake. FGs J, MP, N, G, X1, X2, Y, W1, W2, S1, H1, B and C were the contributors to the phytoplankton biomass during the low-water period (LW) and the transition periods (T1 and T2), while Lo contributed the most during the high-water period (HW). RDA revealed that the most important factor affecting the temporal distribution of FGs was the water discharge and that there are some differences between stations in terms of Si, pH values and the distribution of FGs.

EFFECTS OF ENVIRONMENTAL PARAMETERS ON PLANKTON ASSEMBLAGE IN AJIWA RESERVOIR, KATSINA STATE, NIGERIA

2021 ◽  
Vol 5 (1) ◽  
pp. 118-125
Author(s):  
U. F. Suleiman ◽  
S. Ibrahim ◽  
H. I. Isyaku ◽  
T. I. Nabila ◽  
A. Amir ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Dissolve Oxygen ◽  
Seasonal Variations ◽  
Correlation Matrix ◽  
Physicochemical Parameters ◽  
Oxygen Demand ◽  
Environmental Parameters ◽  
Biological Oxygen Demand ◽  
Laboratory Activities ◽  
Total Dissolved Solid

The effect of environmental (Physicochemical) and biological (plankton) parameters of Ajiwa reservoir were studied for a period of eight months (March–October 2018). Field and laboratory activities were carried out using standard protocols. Mean monthly values of Temperature ranged between 25.87±3.57°C–29.46±0.66°C, Electrical conductivity was between 32.00±3.46µs/cm–210.00±95.39µs/cm. Dissolve Oxygen, Total Dissolved Solid and Biological Oxygen Demand Means of monthly values ranges between 5.53±0.39mg/l–9.35±0.62mg/l, 33.087±0.06mg/l–84.01±4.37mg/l, and 2.69±0.34mg/l–7.27±1.88mg/l. While phosphate and nitrate means of monthly values ranges between 0.04±0.02mg/l–0.09±0.03mg/l, 0.03±0.01mg/l–0.09±0.02mg/l. Four Phytoplankton phyla dominated by Chlorophyta (387org/L), Euglenophyta (160 org/L), Cyanophyta (83 org/L) and Bacillariophyta (63 org/L) were recorded in the reservoir. The Zooplanktons fauna comprises of Rotifers (180 org/L), Cladocerans (149 org/L) and Copepods (78 org/L). Correlation matrix showed that there were significant correlation between Phytoplankton, Zooplankton and Physicochemical parameters. The composition of planktons in the reservoir were affected by seasonal variations and fluctuation of physicochemical parameters

Functional responses of haemocytes in the clam Tapes philippinarum from the Lagoon of Venice: fishing impact and seasonal variations

2003 ◽  
Vol 60 (8) ◽  
pp. 949-958 ◽  
Author(s):  
Valerio Matozzo ◽  
Luisa Da Ros ◽  
Loriano Ballarin ◽  
Francesca Meneghetti ◽  
Maria Gabriella Marin
Keyword(s):  
Seasonal Variations ◽  
Seasonal Pattern ◽  
Environmental Parameters ◽  
Neutral Red ◽  
Fishing Effort ◽  
Physiological Status ◽  
Lagoon Of Venice ◽  
Functional Responses ◽  
Tapes Philippinarum ◽  
Fishing Impact

In the last few years, the Manila clam (Tapes philippinarum) has been subjected to intense fishing effort in the Lagoon of Venice owing to their commercial importance. Because of the lack of data concerning fishing-induced immunomodulation in bivalves, the consequences of fishing impact on functional responses of clam haemocytes were investigated. Clams were seasonally collected from September 2000 to July 2001 from three sites: S. Angelo, a free-fishing area, and Chioggia, inside a licensed area for clam culture, in two zones characterised by fishing and non fishing, respectively. Haematocrit, phagocytosis, Neutral Red retention time, and lysozyme and superoxide dismutase activities were evaluated. No clear fishing effect was recorded, whereas a seasonal pattern of the cell para meters analysed was revealed. Alterations in functional responses of haemocytes seem to be more closely dependent on seasonal variations in both environmental parameters and physiological status of clams than on stress caused by fishing, and they may also be related to adaptation strategies of bivalves.

In Situ Monitoring of Environmental Conditions for Stress Corrosion Cracking

2004 ◽  
Author(s):  
Fraser King ◽  
Katherine Ikeda-Cameron ◽  
Greg Van Boven ◽  
Tom Jack ◽  
Robert Sutherby ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Seasonal Variations ◽  
Potential Temperature ◽  
Environmental Parameters ◽  
Management Program ◽  
In Situ Monitoring ◽  
Soil Parameters ◽  
Integrity Management ◽  
The Right

TransCanada Pipelines have been involved with monitoring environmental conditions at pipe depth for almost 10 years. The purpose of this monitoring is to understand the mechanism of SCC as it occurs in the field and to assist in the development of site-selection models for identifying locations where SCC might be occurring. Monitoring can either be done at many locations along the right-of-way at a given time or continuously at discrete locations in order to observe seasonal variations. A range of environmental parameters can be monitored. Early work focussed on parameters relevant to corrosion, such as soil resistivity, redox potential, temperature, pH, and on- and off-potentials. More recently, parameters relevant to SCC have also been monitored, such as soil CO2 and permeable hydrogen concentrations. In addition, the extent to which these parameters change seasonally has been monitored to determine if the environment is conducive to SCC continuously or whether cracking might only occur at certain times of the year. In terms of implementation, the results of in situ monitoring can be used as part of a larger integrity management program to decide where and when to mitigate SCC. Correlations between soil parameters measured using the portable probe and known SCC sites can be used to identify other susceptible locations or to prioritize different lines for inspection. Seasonal variations at a particular location can be used to derive effective crack growth rates from accelerated laboratory testing in order to determine re-inspection intervals. Examples are provided of both portable and permanent NOVAProbe measurements for low-pH and high-pH SCC.

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