Effect of Environmental Variables on Zooplankton Assemblages in Two Brackish Water Bodies

2019 ◽  
Vol 45 (3) ◽  
pp. 236-251
Author(s):  
A. Gutkowska ◽  
E. Paturej ◽  
J. Koszałka
Keyword(s):  
Brackish Water ◽  
Environmental Variables ◽  
Water Bodies

scholarly journals Constant and seasonal drivers of bird communities in a wind farm: implications for conservation

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2105 ◽  
Author(s):  
Zuzanna M. Rosin ◽  
Piotr Skórka ◽  
Paweł Szymański ◽  
Marcin Tobolka ◽  
Andrzej Luczak ◽  
...  
Keyword(s):  
Environmental Variables ◽  
Wind Farm ◽  
Environmental Planning ◽  
Negative Relationship ◽  
Wind Farms ◽  
Bird Community ◽  
Water Bodies ◽  
Field Size ◽  
Individual Species ◽  
Bird Populations

Background.One of the most difficult challenges for conservation biology is to reconcile growing human demands for resources with the rising need for protecting nature. Wind farms producing renewable energy have been recognised to be a threat for birds, but clear directives for environmental planning are still missing.Methods.Point counts were performed to study the relationship between eight environmental variables and bird populations in different parts of a year on the largest Polish wind farm between March 2011 and February 2013. Variables potentially related to species richness (Chao 1 estimator) and the abundance of the entire bird community as well as five selected farmland species were analysed with the use of generalized linear mixed models.Results.Some associations between the studied variables and bird populations were season/year specific, while others had a constant direction (positive or negative) across seasons and/or years. The latter were distance to the nearest turbine, field size, number of wind turbines, proximity of settlements and water bodies. Spatial autocorrelation and counting time were significantly correlated with bird population estimates but the directions of these relationships varied among seasons and years. Associations between abundance of individual species and environmental variables were species-specific.Conclusions.The results demonstrated a constant negative relationship between wind turbine proximity and bird numbers. Other environmental variables, such as field size, proximity of settlements and water bodies that also had constant associations with bird populations across seasons may be taken into account when minimizing adverse effects of wind farm development on birds or choosing optimal locations of new turbines.

scholarly journals Species Composition Features of Zoopankton in Mineralized Water Bodies from Specially Protected Natural Territories in Ulug-Khem Basin (Republic of Tuva)

2021 ◽  
pp. 398-414
Author(s):  
A. К. Kirova
Keyword(s):  
Species Diversity ◽  
Species Composition ◽  
Brackish Water ◽  
Anthropogenic Impact ◽  
Water Bodies ◽  
Natural Objects ◽  
Mineralized Water ◽  
The Status ◽  
Favorable Conditions ◽  
Specially Protected Natural Territories

The species composition of zooplankton in mineralized water bodies located in the Ulug-Khem basin (Republic of Tuva) was studied. These lakes have the status of natural monuments of regional significance. In total we recorded 53 species of microscopic Custaceans and Rotifers from 32 genera, 13 families, and 8 orders. Cladocera comprises 53% of the species. The dependence of the species diversity on the level of mineralization was revealed; 89% of the species were found in brackish water bodies. The zooplankton composition of the hyperhaline lakes Dus-Khol (Svatikovo) and Cheder has remained constant for many dozen years. The zooplankton includes some species known only from Republic of Tuva in Russia, namely, Microcyclops afganicus and Macrotrix tabrizensis. M. asiaticus and Alona irinae, rare for the fauna of Russia, live in the lake Haak-Hol. A decrease in the total numbers of zooplankton is observed in the lakes, namely: in the lake Dus-Khol, it has decreased by 4 times, in the lake Khadyn it has decreased by 10–19 times as compared to the middle of the last century. Despite the lack of intermediate information, we regard this as a consequence of anthropogenic impact. The emergence of an indicator of pollution (Brachionus nilsoni) in the lake Khadin confirms this version. At the same time, the stable finding of species rare for the fauna of Russia indicates the presence of favorable conditions for their development and life, which increases the value of the reservoirs themselves, which are already unique natural objects.

scholarly journals Dynamics of Cyanobacteria and Related Environmental Drivers in Freshwater Bodies Affected by Mitten Crab Culturing: A Study of Lake Guchenghu, China

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2468
Author(s):  
Hongmin Li ◽  
Huihui Chen ◽  
Xiaohong Gu ◽  
Zhigang Mao ◽  
Qingfei Zeng ◽  
...  
Keyword(s):  
Environmental Variables ◽  
Phytoplankton Biomass ◽  
Dominant Species ◽  
N:P Ratio ◽  
Water Bodies ◽  
Environmental Drivers ◽  
Mitten Crab ◽  
Total Phytoplankton ◽  
Freshwater Bodies ◽  
Harmful Species

Mitten crab aquaculture is prevalent in China, however, knowledge about the threat of cyanobacteria in mitten crab aquaculture-impacted water bodies is limited. Here, seasonal variations of cyanobacteria and their relationships with environmental factors were investigated for Lake Guchenghu area. Results suggested the changes of cyanobacteria community in crab ponds distinguished from the adjacent lake. In the lake, cyanobacterial biomass (3.86 mg/L, 34.6% of the total phytoplankton) was the highest in autumn with the dominance of Oscillatoria, Aphanocapsa and Pesudanabaena. By contrast, in crab ponds, cyanobacteria (46.80 mg/L, 97.2% of the total phytoplankton biomass) were the most abundant in summer when Pesudanabaena and Raphidiopsis were the dominant species. Of particular note was that obviously higher abundance of filamentous and potentially harmful species (e.g., Raphidiopsis raciborskii and Dolichospermum circinale) were observed in ponds compared to the lake. Specifically, water depth (WD), permanganate index (CODMn), total phosphorus (TP), N:P ratio, and NO 2 −-N were the key environmental variables affected cyanobacteria composition. For crab ponds, N:P ratio, water temperature (WT) and TP were the potential environmental drivers of cyanobacteria development. This study highlighted the fact that mitten crab culture had non-negligible influences on the cyanobacteria community and additional attention should be paid to the cyanobacteria dynamics in mitten crab culture-impacted water bodies, especially for those potentially harmful species.

Nutrients excretion by zooplankton in two brackish water bodies

2018 ◽  
Vol 103 (1-2) ◽  
pp. 15-25
Author(s):  
Agnieszka Gutkowska ◽  
Ewa Paturej ◽  
Magdalena Bowszys
Keyword(s):  
Brackish Water ◽  
Water Bodies

scholarly journals Protozooplankton and its relationship with environmental conditions in 13 water bodies of the Mogi-Guaçu basin - SP, Brazil

2013 ◽  
Vol 13 (4) ◽  
pp. 152-163 ◽  
Author(s):  
Inessa Lacativa Bagatini ◽  
Ana Lúcia Gerardi Spínola ◽  
Bianca de Miranda Peres ◽  
Adrislaine da Silva Mansano ◽  
Mafalda Alexandra Antunes Rodrigues ◽  
...  
Keyword(s):  
Environmental Variables ◽  
Sao Paulo ◽  
Water Bodies ◽  
Bromophenol Blue ◽  
São Paulo ◽  
Paulo State ◽  
Two Samples ◽  
São Paulo State ◽  
Biological Aspects ◽  
The Mean

Protozooplankton is an important component of the aquatic microbial food webs and its composition, density, and distribution reflect the chemical, physical, and biological aspects of the environment. Considering the scarce literature on freshwater protozoans in Brazil and on protozoan ecology in subtropical environments, we listed the ciliates and amoebae taxa found in 13 water bodies in São Paulo State and analyzed their abundance in relation to the environmental variables. We collected two samples in each environment, fixed immediately with mercuric chloride and stained with bromophenol blue. After microscopical analysis, 74 protozoan genera were identified and the Ciliophora were dominant in the majority of the environments. The Stichotrichia, represented mostly by the genus Halteria, occurred in all environments, and was the dominant subclass in five of them. The canonic correspondence analysis of the most frequent genera and the environmental variables showed that nitrite and nitrate were the variables that better explained the distribution of Limnostrombidium, Urotricha, and Vorticella. The densities of the genera Halteria, Coleps, and of the species Cinetochilum margaritaceum were positively affected by increasing concentrations of dissolved oxygen, particulate phosphate, conductivity, and temperature. C. margaritaceum were also negatively affected by increasing concentrations of nitrite and nitrate. Considering that we made only one sampling in each environment, the richness was high compared to the mean diversity of lakes in the São Paulo State. The Diogo Lake, located in an ecological reserve, was the richest one, confirming the need of more research on the biodiversity of more preserved environments.

scholarly journals A highly active karstic aquifer bounded by saline waters: The Judea Group aquifer

2019 ◽  
Vol 98 ◽  
pp. 07008
Author(s):  
Ittai Gavrieli ◽  
Joseph Guttman ◽  
Yoseph Yechieli ◽  
Firas Talhami ◽  
Avihu Burg
Keyword(s):  
Brackish Water ◽  
Water Bodies ◽  
Karstic Aquifer ◽  
Mountain Ridge ◽  
Highly Active ◽  
Saline Waters ◽  
Spring System ◽  
East And West ◽  
Groundwater Basins ◽  
End Members

The freshwater of the Judea Group aquifer that recharges on the crest of the Judea and Samria Mountain ridge flows east and west, defining two groundwater basins. At the foothills of both basins the freshwater encounters ancient saline or brackish water. The mode of interaction between the two water bodies within each basin is different, although both eventually discharge as brackish spring system. We describe these systems and identify the source of the higher salinity end members.

scholarly journals Using Bayesian hierarchical models and random forest algorithm for habitat use studies: a case of nest site selection of the crested ibis at regional scales

2015 ◽  
Author(s):  
Xinhai Li ◽  
Tianqing Zhai ◽  
Yan Jiao ◽  
Guiming Wang
Keyword(s):  
Random Forest ◽  
Site Selection ◽  
Hierarchical Models ◽  
Environmental Variables ◽  
Nest Site ◽  
Bayesian Hierarchical Models ◽  
Nest Site Selection ◽  
Water Bodies ◽  
Bayesian Hierarchical ◽  
Crested Ibis

The association of species distribution and environmental variables is often complex, with nonlinear and interacting effects. Bayesian hierarchical models can quantify linear and high order effects of the variables, as well as their interaction effects. Their strength is to take into account the uncertainties in observation, models, and parameters. However, the model selection process is usually time-consuming, especially when the number of environmental variables is large. Random forest, an efficient machine learning algorithm, can rank the environmental variables so as to facilitate the model selection process. We analyzed the nest site selection of the crested ibis (Nipponia nippon) at watersheds in its distribution range. The crested ibis has attracted much attention in the past 30 years due to its extremely low population level, and now it has recovered to over 1,000 individuals in the wild. We built Bayesian hierarchical models to quantify the association between the number of nests in 95 watersheds and nine environmental variables of these watersheds. We applied random forest to check the effect of every variable and removed the unimportant variables from the hierarchical models. Unlike our previous studies, we found that the interaction between the area of rice paddy and the area of water bodies (i.e. rivers, lakes and ponds) had most contribution to the nest site selection, whereas the linear terms of either rice paddy or water body had little effects. The detection probability of the nests during the surveys was inversely associated with elevation and the standard deviation of elevation (i.e. roughness of the landscape) in the watershed. Our models provide the insight that the crested ibis need both rice paddies and water bodies in their annual life cycle. Habitat protection practices should cover not only rice paddies, but also water bodies to ensure long term survival of this endangered bird.

scholarly journals Synergistic Action of Plants and Microorganism in Integrated Floating Bed on Eutrophic Brackish Water Purification in Coastal Estuary Areas

2021 ◽  
Vol 8 ◽  
Author(s):  
Ming Liu ◽  
Youyuan Chen ◽  
Yadong Wu ◽  
Jiameng Guo ◽  
Ping Sun ◽  
...  
Keyword(s):  
Salt Tolerance ◽  
Water Purification ◽  
Brackish Water ◽  
Volcanic Rocks ◽  
Ammonia Nitrogen ◽  
Pollutant Removal ◽  
Water Bodies ◽  
Poor Growth ◽  
Coastal Estuary ◽  
Pollutants Removal

Eutrophic water bodies in coastal estuary areas usually show saline-alkaline characteristics influenced by tides. The purification performance of traditional planted floating beds in this water body is limited because of the poor growth of plants. A novel integrated floating bed with plants (Iris pseudoacorus), fillers (volcanic rocks and zeolites), and microbes named PFM was established, and the pollutant removal performance was studied. Results showed that the average ammonia nitrogen (NH4+-N), total nitrogen (TN), total phosphorus (TP), and permanganate index (CODMn) removal efficiencies of PFM were higher with the value of 81.9, 78.5, 53.7, and 72.4%, respectively, when compared with the other floating beds containing plants (P), fillers (F), microbes (M), and plants and fillers (PF) in this study. Therein, the most of NH4+-N (30.1%), TN (27.9%), TP (22.5%), and CODMn (43.6%) were removed by microbes, higher than those removed by plants and fillers. Analysis of the microbial community revealed that the establishment of PFM led to a higher microbial richness than M, and Acinetobacter, as the main microbes with the function of salt tolerance and denitrification, were dominated in PFM with a relative abundance of 6.8%. It was inferred that the plants and fillers might enrich more salt-tolerance microbes for pollutants removal, and microbes favored the growth of plants via degradation of macromolecular substrates. Synergistic actions in the process of eutrophic brackish water purification were established. This study provided an idea for the application of integrated floating bed in eutrophic and brackish water bodies purification in coastal estuary areas.

scholarly journals Life history traits influence in gonad composition of two sympatric species of flatfish

2015 ◽  
Vol 63 (3) ◽  
pp. 171-179
Author(s):  
Juan Luis Gadea Alvarez ◽  
Martín Bessonart ◽  
Larisa Magnone ◽  
Florencia Féola ◽  
María Salhi
Keyword(s):  
Life History ◽  
Fatty Acid ◽  
Food Webs ◽  
Lipid Content ◽  
Brackish Water ◽  
Life History Traits ◽  
Sympatric Species ◽  
Water Bodies ◽  
Gonadal Maturation ◽  
Paralichthys Orbignyanus

AbstractParalichthys orbignyanus and Paralichthys patagonicus are flatfish with different life history traits, having in common the condition of breeding in seawater. Paralichthys patagonicus remain their whole life in open seawater and Paralichthys orbignyanus are sometimes found in brackish water bodies. As marine and estuarine food webs have different fatty acid (FA) compositions, the aim of this study was to characterize the gonadal maturation of P. orbignyanus and P. patagonicus females through the analysis of lipid content and FA profile in order to understand to what extent life history traits are reflected in the ovarian composition. During gonadal maturation lipid content increased and FA profiles changed in both species, but the lipid increase was greater in P. orbignyanus. The N-3FA and n-3HUFA proportions increased in both species but were higher in P. orbignyanus. The differences between the lifestyles of these species were reflected in the ovarian FA profile mainly as a result of differences in their FA metabolism, causing a greater accumulation of n-3FA and n-3HUFA in P. orbignyanus than in P. patagonicus. The higher lipid accumulation in P. orbignyanus’ ovaries could indicate that this species, feeding in brackish water bodies, has the possibility of storing more energy than P. patagonicus.

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