Cyclic nature of the biotic attributes of macroinvertebrate communities in the Cenomanian–Turonian strata of Sinai: water depth-driven biological responses

Facies ◽  
2021 ◽  
Vol 68 (1) ◽  
Author(s):  
Sherif Farouk ◽  
Khaled Al-Kahtany ◽  
Ahmed Awad Abdelhady
Keyword(s):  
Water Depth ◽  
Macroinvertebrate Communities ◽  
Biological Responses

scholarly journals Assessing macroinvertebrate communities in relation to environmental variables: the case of Sambandou wetlands, Vhembe Biosphere Reserve

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Tatenda Dalu ◽  
Rivoningo Chauke
Keyword(s):  
Community Structure ◽  
Water Depth ◽  
Environmental Variables ◽  
Anthropogenic Activities ◽  
Biosphere Reserve ◽  
High Water ◽  
Macroinvertebrate Community ◽  
Macroinvertebrate Communities ◽  
Negative Effect ◽  
Macrophyte Cover

AbstractThe Vhembe Biosphere Reserve, South Africa, contains many wetlands that serve as wildlife habitats and provide vital ecosystem services. Some of the wetlands are continuously being degraded or destroyed by anthropogenic activities causing them to disappear at an alarming rate. Benthic macroinvertebrates are known as good water quality bioindicators and are used to assess aquatic ecosystem health. The current study investigated habitat quality using macroinvertebrate community structure and other biotic variables (i.e. phytoplankton, macrophytes) in relation to environmental variables in the Sambandou wetlands using canonical correspondence analysis (CCA). A total of fifteen macroinvertebrate families were identified over two seasons. The CCA highlighted seven variables, i.e. pH, phosphate concentration, temperature, ammonium, macrophyte cover, conductivity and water depth, which were significant in structuring macroinvertebrate community. Picophytoplankton and microphytoplankton concentrations decreased from winter to summer, whereas nanophytoplankton concentration increased from winter to summer. Thus, the dominance of small-sized phytoplankton indicated nutrient limitation and decreased productivity, whereas winter sites 2 and 3 were dominated by large-celled phytoplankton, highlighting increased productivity. Winter sites were mostly negatively associated with CCA axis 1 and were characterised by high temperature, phosphate and ammonium concentrations, macrophyte cover, pH and conductivity. Summer sites were positively associated with axis 1, being characterised by high water depth and pH levels. The results obtained highlighted that agricultural activities such as cattle grazing and crop farming and sand mining/poaching had a negative effect on macroinvertebrate community structure.

scholarly journals Water physicochemistry and benthic macroinvertebrate communities in a tropical reservoir: The role of water level fluctuations and water depth

Limnologica ◽  
2015 ◽  
Vol 55 ◽  
pp. 13-20 ◽  
Author(s):  
Francis S. Magbanua ◽  
Nikki Yvette B. Mendoza ◽  
Christine Jewel C. Uy ◽  
Christoph D. Matthaei ◽  
Perry S. Ong
Keyword(s):  
Water Level ◽  
Water Depth ◽  
Water Level Fluctuations ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Tropical Reservoir

Environmental predictors of macroinvertebrate communities in coastal wetlands of southern Brazil

2008 ◽  
Vol 59 (6) ◽  
pp. 540 ◽  
Author(s):  
Cristina Stenert ◽  
Roberta C. Bacca ◽  
Carolina C. Mostardeiro ◽  
Leonardo Maltchik
Keyword(s):  
Environmental Factors ◽  
Water Depth ◽  
Habitat Diversity ◽  
Sediment Chemistry ◽  
Macroinvertebrate Communities ◽  
Southern Brazil ◽  
Ecological Data ◽  
Wetland Area ◽  
Aquatic Macroinvertebrate ◽  
Negatively Associated

The rapid degradation of wetlands worldwide accentuates the urgent need for ecological data to help manage and protect the threatened biodiversity in the remaining often-fragmented wetlands. In the Neotropics where fragmentation is common, environmental factors structuring aquatic macroinvertebrate communities are poorly known. We tested the hypothesis that physical features, such as wetland area, habitat diversity, water depth and temperature, and water and sediment chemistry are important correlates with richness, density and composition of wetland macroinvertebrate assemblages in Brazil. If so, do these correlations differ between summer and winter? A total of 16 895 individuals across 61 families were collected. Richness was positively associated with habitat diversity and water depth and negatively associated with water temperature. Macroinvertebrate density was negatively associated with water depth, and positively correlated with habitat diversity, percentage of sediment organic matter and water conductivity. Macroinvertebrate composition was associated mainly with wetland area and habitat diversity in the wetlands studied; these relationships persisted in both seasons. Our data illustrate environmental factors that potentially structure and maintain aquatic macroinvertebrate biodiversity in southern Brazil wetlands, and should be managed because 90% of these ecosystems have already been lost as a result of human activities.

scholarly journals Structural Changes in Macroinvertebrate Communities Associated with Reduction in the Management of Coastal Saltpans

2009 ◽  
Vol 2009 ◽  
pp. 1-13 ◽  
Author(s):  
P. C. Tavares ◽  
D. Alves ◽  
M. Shapouri
Keyword(s):  
Organic Matter ◽  
Water Depth ◽  
Structural Changes ◽  
Macroinvertebrate Communities ◽  
Total Abundance ◽  
Water Conductivity ◽  
Disturbed Systems ◽  
Abc Method ◽  
Positive Correlations ◽  
Depth Water

Saltpans with different management levels were studied for macroinvertebrate community and abiotic variables like water depth, water conductivity, and organic matter in sediments. Significant variation was observed between saltpans, between ponds within saltpans, and between periods within ponds for abundance, and also between saltpans for biomass. Environmental variables varied significantly between saltpans and between ponds. Significant positive correlations occurred between depth and total abundance, between depth and Corixidae abundance, and also between organic matter in sediments and diversity. Significant negative correlations were observed between depth and diversity and between organic matter in sediments and total abundance. Multidimensional Scaling and Canonical Correspondence Analysis confirmed results of analysis of variance and correlations. Invertebrate communities were numerically dominant as also revealed by ABC method. Abandoned saltpan ponds show the largest changes in water depth, with communities dominated by some opportunist species, varying within short temporal scales, which is typical from highly disturbed systems.

Is the link between emotional suppression and biological responses to stress mediated by rumination?

2010 ◽  
Author(s):  
Charlotte Leonie Stewart ◽  
Jolanta Opacka-Juffry ◽  
Changiz Mohiyeddini
Keyword(s):  
Emotional Suppression ◽  
Biological Responses

Evaluation of Discharges by CSOs from Water Depth Measurements: Case Study of a Lateral with a Low and Long Crest

2002 ◽  
Author(s):  
M. Zug ◽  
F. Blanchet ◽  
C. Joannis ◽  
G. Ruban ◽  
F. Cohen-Solal
Keyword(s):  
Water Depth

Comparison of the performance of oscillating water column devices based on arrangements of water columns

2020 ◽  
Vol 14 (3) ◽  
pp. 7082-7093
Author(s):  
Jahirwan Ut Jasron ◽  
Sudjito Soeparmani ◽  
Lilis Yuliati ◽  
Djarot B. Darmadi
Keyword(s):  
Wave Propagation ◽  
Water Column ◽  
Water Depth ◽  
Graphical Form ◽  
Wave Power ◽  
Oscillating Water Column ◽  
Power Absorption ◽  
Water Columns ◽  
Single Column ◽  
Parallel Arrangement

The hydrodynamic performance of oscillating water column (OWC) depends on the depth of the water, the size of the water column and its arrangement, which affects the oscillation of the water surface in the column. An experimental method was conducted by testing 4 water depths with wave periods of 1-3 s. All data recorded by the sensor is then processed and presented in graphical form. The research focused on analyzing the difference in wave power absorption capabilities of the three geometric types of OWC based on arrangements of water columns. The OWC devices designed as single water column, the double water column in a series arrangement which was perpendicular to the direction of wave propagation, and double water column in which the arrangement of columns was parallel to the direction of wave propagation. This paper discussed several factors affecting the amount of power absorbed by the device. The factors are the ratio of water depth in its relation to wavelength (kh) and the inlet openings ratio (c/h) of the devices. The test results show that if the water depth increases in the range of kh 0.7 to 0.9, then the performance of the double chamber oscillating water column (DCOWC) device is better than the single chamber oscillating water column (SCOWC) device with maximum efficiency for the parallel arrangement 22,4%, series arrangement 20.8% and single column 20.7%. However, when referring to c/h, the maximum energy absorption efficiency for a single column is 27.7%, double column series arrangement is 23.2%, and double column parallel arrangement is 29.5%. Based on the results of the analysis, DCOWC devices in parallel arrangement showed the ability to absorb better wave power in a broader range of wave frequencies. The best wave of power absorption in the three testing models occurred in the wave period T = 1.3 seconds.

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