scholarly journals Controlling Factors of Phytoplankton Productivity in Marshes in a Hot Climate with High Seasonal Variation

2021 ◽  
Vol 9 (8) ◽  
pp. 811
Author(s):  
Fuad Ameen ◽  
Alaa I. Albueajee ◽  
Fikrat M. Hassan ◽  
Steven L. Stephenson ◽  
Ali A. Z. Douabul
Keyword(s):  
Seasonal Variation ◽  
Water Temperature ◽  
Chlorophyll A ◽  
Primary Productivity ◽  
Controlling Factors ◽  
Wet Season ◽  
Phytoplankton Productivity ◽  
Entire Area ◽  
Biological Variables ◽  
Hot Climate

In this work the Auda marsh, which is part of a system of Iraqi marshes, was sampled to assess the seasonal dynamics and controlling factors of microalgae productivity. The marshes are situated in a hot climate with high seasonal variation near the Arabian Gulf. Physicochemical and biological measurements were taken for water in three areas. Bio-optical models were constructed to describe the primary productivity and chlorophyll-a concentrations in the wet and dry seasons separately and also for the entire area of the Iraqi marshes. The models, as well as almost all measurements, showed high seasonal variation. The mean water temperature was 16 °C in the wet season and 28 °C in the dry season. An almost twofold difference was measured for turbidity and the concentrations of dissolved oxygen and chlorophyll-a for the two seasons. Chlorophyll-a appeared to be a better indicator of ecosystem conditions than primary productivity or biological oxygen demand, according to the results obtained from canonical correlation analysis. Nitrogen or phosphorous did not explain primary productivity or chlorophyll-a to an appreciable extent. Biological variables were related most strongly to water temperature and turbidity, which were the factors most important for controlling phytoplankton productivity in the marshes.

scholarly journals Temporal coherence among tropical coastal lagoons: a search for patterns and mechanisms

2010 ◽  
Vol 70 (3 suppl) ◽  
pp. 803-814 ◽  
Author(s):  
A. Caliman ◽  
LS. Carneiro ◽  
JM. Santangelo ◽  
RD. Guariento ◽  
APF. Pires ◽  
...  
Keyword(s):  
Water Temperature ◽  
Chlorophyll A ◽  
Coastal Lagoons ◽  
Temporal Coherence ◽  
Structure And Function ◽  
Tropical Ecosystems ◽  
Water Colour ◽  
Chlorophyll A Concentration ◽  
Biological Variables ◽  
And Function

Temporal coherence (i.e., the degree of synchronicity of a given variable among ecological units within a predefined space) has been shown for several limnological features among temperate lakes, allowing predictions about the structure and function of ecosystems. However, there is little evidence of temporal coherence among tropical aquatic systems, where the climatic variability among seasons is less pronounced. Here, we used data from long-term monitoring of physical, chemical and biological variables to test the degree of temporal coherence among 18 tropical coastal lagoons. The water temperature and chlorophyll-a concentration had the highest and lowest temporal coherence among the lagoons, respectively, whereas the salinity and water colour had intermediate temporal coherence. The regional climactic factors were the main factors responsible for the coherence patterns in the water temperature and water colour, whereas the landscape position and morphometric characteristics explained much of the variation of the salinity and water colour among the lagoons. These results indicate that both local (lagoon morphometry) and regional (precipitation, air temperature) factors regulate the physical and chemical conditions of coastal lagoons by adjusting the terrestrial and marine subsidies at a landscape-scale. On the other hand, the chlorophyll-a concentration appears to be primarily regulated by specific local conditions resulting in a weak temporal coherence among the ecosystems. We concluded that temporal coherence in tropical ecosystems is possible, at least for some environmental features, and should be evaluated for other tropical ecosystems. Our results also reinforce that aquatic ecosystems should be studied more broadly to accomplish a full understanding of their structure and function.

scholarly journals Seasonality of Phytoplankton productivity of the river Turag of Dhaka in relation to its water quality

2014 ◽  
Vol 42 (2) ◽  
pp. 287-294 ◽  
Author(s):  
Moniruzzaman Khondker ◽  
Syeda Gousia Abed
Keyword(s):  
Water Quality ◽  
Chlorophyll A ◽  
Primary Productivity ◽  
Nitrate Nitrogen ◽  
Nitrogen Concentration ◽  
Strong Positive Correlation ◽  
Monsoon Period ◽  
Phytoplankton Productivity ◽  
Positive Correlation ◽  
Chl A

A total of 16 water quality parameters together with the phytoplankton biomass as chlorophyll a and potential primary productivity of the river Turag of Bangladesh were measured for one year (July 1994 - June 1995). Potential primary productivity ranged from 6.22 - 199.7 ?gC/l/hr which showed a closer peak with total phytoplankton. Chlorophyll a, phosphate-phosphorus and nitrate-nitrogen concentration of the river ranged from 1.84 - 162.8, 30.28 - 796.54 and 27.02 - 905.04 ?g/l, respectively. A decrease in the mean concentration of these parameters in monsoon was seen compared to their high concentration in pre-monsoon period, which however, increased again in post-monsoon and winter. In the one hand, strong positive correlation was observed between primary productivity and chl a, on the other hand, chl a showed strong positive correlation with phosphate-phosphorus and nitrate nitrogen. Significant negative correlation between dissolved oxygen (DO) and phosphate-phosphorus indicates the eutrophic nature of the river. This effect was minimized in monsoon. Concentration of phosphate-phosphorus, nitrate-nitrogen and chl a remained high in pre-monsoon period but reduced by 90, 87 and 97%, respectively in monsoon. Besides, DO recovered 90% in monsoon compared to its pre-monsoon concentration. Within a span of one and a half decade, the concentration of PO4-P and NO3-N in the water has increased 4 - and 32-fold, respectively. DOI: http://dx.doi.org/10.3329/bjb.v42i2.18031 Bangladesh J. Bot. 42(2): 287-294, 2013 (December)

Are seasonal lakes as productive as permanent lakes? A case study from Ireland

2010 ◽  
Vol 67 (8) ◽  
pp. 1291-1302 ◽  
Author(s):  
Helder Cunha Pereira ◽  
Norman Allott ◽  
Catherine Coxon
Keyword(s):  
Seasonal Variation ◽  
Linear Regression ◽  
Chlorophyll A ◽  
Algal Biomass ◽  
P Limitation ◽  
Underlying Causes ◽  
Western Ireland ◽  
Log Linear ◽  
First Time

This paper compares, for the first time, nutrient levels and chlorophyll a measured in a set of seasonal lakes with those reported for permanent lakes in the literature. Twenty-two turloughs (karstic seasonal lakes) in western Ireland were sampled monthly from the onset of flooding (October) until they dried out (6 to 9 months). The turloughs showed similar levels of nutrients and chlorophyll a to those reported for Irish and international lakes. Chlorophyll a peaked between November and February in the majority of turloughs, sometimes with values higher than those measured in mesotrophic lakes in summer. A significant log-linear regression was found between total phosphorus and chlorophyll a, which suggests P limitation of algal biomass in the majority of the turloughs. The regression characteristics were not significantly different than those described in similar studies of permanent lakes. Patterns in seasonal variation of nutrients are also presented, their underlying causes being discussed in relation to their transport within catchments. Our results show that despite being predominantly winter phenomena, turloughs can be as productive as permanent lakes.

Zooplankton dynamics during autumn circulation in a small, wind-sheltered, Mediterranean lake

2006 ◽  
Vol 57 (4) ◽  
pp. 441 ◽  
Author(s):  
M. Alvarez-Cobelas ◽  
A. Baltanás ◽  
J. L. Velasco ◽  
C. Rojo
Keyword(s):  
Water Temperature ◽  
Current Model ◽  
Fish Predation ◽  
Controlling Factors ◽  
Heterotrophic Nanoflagellates ◽  
Delayed Effects ◽  
Zooplankton Dynamics ◽  
Mediterranean Lake ◽  
Fish Abundances ◽  
Ceriodaphnia Reticulata

Few studies have been undertaken on zooplankton dynamics during the transition from late stratification to early mixing in lakes. The Plankton Ecology Group (PEG) model of plankton seasonality only considers water temperature, edible phytoplankton and fish predation as zooplankton-controlling factors during that period. The water-column edible algal and bacterial fractions, heterotrophic nanoflagellates, ciliates, rotifers, cladocerans and copepods were studied during 93 consecutive days of mixing-transition in a wind-sheltered, Mediterranean lake without planktivorous fish. Abundances of all zooplankton populations except ciliates, Daphnia longispina and copepodites, were related to water temperature. In addition to PEG controlling factors, time series analysis indicated competition between ciliates and Ceriodaphnia reticulata and Polyarthra dolichoptera and D. longispina, predation of Arctodiaptomus salinus on ciliates, herbivory of adult copepods on the 5–20 μm phytoplanktonic size and delayed effects shorter than one week. The remaining zooplankton populations did not show any edible size preference. Ceriodaphnia reticulata showed evidence of herbivory on bacteria and picoplankton and competition with Hexarthra fennica in shorter periods. Phyto- and zooplankton production were decoupled. These results, and others from warmer periods and latitudes, suggest that the current model of lake plankton seasonality must be reviewed.

scholarly journals Effects of Weir Construction on Phytoplankton Assemblages and Water Quality in a Large River System

2018 ◽  
Vol 15 (11) ◽  
pp. 2348 ◽  
Author(s):  
Hae-Jin Lee ◽  
Hae-Kyung Park ◽  
Se-Uk Cheon
Keyword(s):  
Water Quality ◽  
Chlorophyll A ◽  
River System ◽  
Large River ◽  
Anthropogenic Factors ◽  
Centric Diatom ◽  
Nakdong River ◽  
Biological Variables ◽  
Physical Chemical ◽  
The Nakdong River

Flow regulation is one of the most common anthropogenic factors affecting rivers worldwide. In Korea, 16 weirs were constructed along four major rivers from 2009 to 2012. This study aimed to elucidate initial changes in physical, chemical, and biological variables after the construction of consecutive weirs on the Nakdong River, a major large river system. Water quality variables and phytoplankton cell densities were investigated at eight representative sites and compared with the data recorded before the weir construction. There were spatial and temporal changes in the hydraulic retention time (HRT), total phosphorus (TP), and chlorophyll a concentrations among the eight weir sections. HRT increased after the weir construction, while TP and chlorophyll a tended to decrease from the middle to lower section of the Nakdong River. Furthermore, differences were observed in the phytoplankton community composition between 2006–2007 and 2013. There was a marginal decrease in the duration of centric diatom (Stephanodiscus hantzschii) blooms after weir construction. However, Microcystis aeruginosa proliferated more extensively during summer and autumn than it did before the weir construction. Our results suggest that changes in hydrological factors, in response to consecutive weir construction, may contribute to greater physical, chemical, and ecological variability.

scholarly journals Seasonal Variation in Abundance, Distribution and Environmental Impacts of Geomicrobiological Communities in the Lower Calabar River Channel, Calabar, Nigeria

2021 ◽  
pp. 1-14
Author(s):  
F A Abija ◽  
Keyword(s):  
Seasonal Variation ◽  
Environmental Contaminants ◽  
Total Coliform ◽  
River Channel ◽  
Abundance Distribution ◽  
Wet Season ◽  
E Coli ◽  
Environmental Health Risk ◽  
Domestic Use ◽  
Abundance And Distribution

Microbes act as geochemical agents for the degradation of environmental contaminants hence their abundance and distribution influences ecological response to pollution stress in soils, sediments, and rivers systems and in environmental protection. In this paper seasonal variation in geomicrologicl abundance in the river water, sediments and adjoining soils have been assessed. The results indicate a higher microorganism count during the wet season. The presence of E. coli in 100ml of water implies that water is unsuitable for any domestic use without disinfection. The Faecal and Total Coliform counts also indicate that undesirable sources are contaminating the river and posing environmental health risk. However environmental self-remediation and possible absence of sources of the microorganisms was promoted during the wet season than the dry season.

Correlation between Chlorophyll-a Concentration and Environmental Factors in Jihongtan Reservoir

2011 ◽  
Vol 356-360 ◽  
pp. 959-962
Author(s):  
Ji Ping Ma ◽  
Cui Jie Rui ◽  
Jian Hua Ge ◽  
Yu Hua Liu ◽  
Zhi Wen Song ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Environmental Factors ◽  
Dissolved Oxygen ◽  
Statistical Method ◽  
Chlorophyll A ◽  
Potassium Permanganate ◽  
Total Nitrogen ◽  
Average Concentration ◽  
Low Concentrations ◽  
High Concentrations

Based on the Jihogntan reservoir’s monitoring data from 2006 to 2009, eutrophication of Jihongtan reservoir was assessed. The result showed that the nutrition level of the Jihongtan reservoir was middle in recent years. The average concentration of chlorophyll-a(Chla) was higher in summer and autumn than in spring and winter. The correlation between concentration of Chla and some environmental factors was studied by statistical method, and seasonal variation of Chla and the extent of eutrophication were also analyzed. The results showed that the correlations between Chla and total nitrogen(TN), dissolved oxygen(DO) and transparency were significantly negative, and that between Chla and total phosphorus(TP), temperature(T) and potassium permanganate index(COD Mn) were significantly positive. The growth of phytoplankton was promoted by TP and TN at low concentrations, and inhibited by TN at high concentrations.

scholarly journals Estimation of the Particulate Organic Carbon to Chlorophyll-a Ratio Using MODIS-Aqua in the East/Japan Sea, South Korea

2020 ◽  
Vol 12 (5) ◽  
pp. 840 ◽  
Author(s):  
Dabin Lee ◽  
SeungHyun Son ◽  
HuiTae Joo ◽  
Kwanwoo Kim ◽  
Myung Joon Kim ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Particulate Organic Carbon ◽  
Chlorophyll A ◽  
Primary Productivity ◽  
Seasonal Variability ◽  
Japan Sea ◽  
Global Ocean ◽  
Phytoplankton Communities

In recent years, the change of marine environment due to climate change and declining primary productivity have been big concerns in the East/Japan Sea, Korea. However, the main causes for the recent changes are still not revealed clearly. The particulate organic carbon (POC) to chlorophyll-a (chl-a) ratio (POC:chl-a) could be a useful indicator for ecological and physiological conditions of phytoplankton communities and thus help us to understand the recent reduction of primary productivity in the East/Japan Sea. To derive the POC in the East/Japan Sea from a satellite dataset, the new regional POC algorithm was empirically derived with in-situ measured POC concentrations. A strong positive linear relationship (R2 = 0.6579) was observed between the estimated and in-situ measured POC concentrations. Our new POC algorithm proved a better performance in the East/Japan Sea compared to the previous one for the global ocean. Based on the new algorithm, long-term POC:chl-a ratios were obtained in the entire East/Japan Sea from 2003 to 2018. The POC:chl-a showed a strong seasonal variability in the East/Japan Sea. The spring and fall blooms of phytoplankton mainly driven by the growth of large diatoms seem to be a major factor for the seasonal variability in the POC:chl-a. Our new regional POC algorithm modified for the East/Japan Sea could potentially contribute to long-term monitoring for the climate-associated ecosystem changes in the East/Japan Sea. Although the new regional POC algorithm shows a good correspondence with in-situ observed POC concentrations, the algorithm should be further improved with continuous field surveys.

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