scholarly journals Aquatic macroinvertebrates associated with Eichhornia azurea (Swartz) Kunth and relationships with abiotic factors in marginal lentic ecosystems (São Paulo, Brazil)

2013 ◽  
Vol 73 (1) ◽  
pp. 149-162 ◽  
Author(s):  
CV. Silva ◽  
R. Henry
Keyword(s):  
Biological Diversity ◽  
Aquatic Macrophyte ◽  
Abiotic Factors ◽  
Aquatic Macroinvertebrates ◽  
Macroinvertebrate Community ◽  
Coastal Zones ◽  
Taxa Richness ◽  
Eichhornia Azurea ◽  
Different Seasons ◽  
Animal Community

Marginal lakes are characterised by their having high biological diversity due to the presence of aquatic macrophytes in their coastal zones, providing habitats for refuge and food for animal community members. Among the fauna components associated with macrophytes, aquatic macroinvertebrates are important because they are an energy source for predators and fish. In six lakes and two different seasons (March and August 2009), the ecological attributes of aquatic macroinvertebrate community associated with Eichhornia azurea were compared and the controlling environmental factors were identified. Since the attributes of macroinvertebrate community are strictly associated with abiotic variables of each distinct habitat, our hypothesis was that each site associated with the same floating aquatic macrophyte (E. azurea) should have a typical composition and density of organisms. We identified 50 taxa of macroinvertebrates, with greater taxa richness for aquatic insects (37 taxa) divided into eight orders; the order Diptera being the most abundant in the two study periods. On the other hand, higher values of total taxa richness were recorded in August. Dissolved oxygen and pH presented the greatest number of significant positive correlations with the different taxa. The animals most frequently collected in the six lakes in March and August 2009 were Hirudinea, Oligochaeta, Hydrachnidae, Conchostraca, Ostracoda, Noteridae, Ceratopogonidae, Chironomidae, Culicidae, Caenidae, Pleidae, Aeshnidae, Libellulidae, Coenagrionidae and Nematoda. Only densities of Trichoptera, Ostracoda and Conchostraca presented the highest significant differences between lakes in both study periods and considering the composition of macroinvertebrates no significant differences were registered for macroinvertebrate composition.

scholarly journals Fish associated with aquatic macrophytes in the Chacororé-Sinhá Mariana Lake system and Mutum River, Pantanal of Mato Grosso, Brazil

2009 ◽  
Vol 69 (1) ◽  
pp. 101-108 ◽  
Author(s):  
EB. Pacheco ◽  
CJ. Da-Silva
Keyword(s):  
Eichhornia Crassipes ◽  
Aquatic Macrophytes ◽  
Biological Diversity ◽  
Aquatic Macrophyte ◽  
Environmental Conservation ◽  
Left Bank ◽  
Mato Grosso ◽  
Analysis Of Similarity ◽  
Eichhornia Azurea ◽  
Macrophyte Species

On the left bank of the Cuibá River, one of the main tributaries of the Pantanal in Mato Grosso, are located the Chacororé and Sinhá Mariana Lakes and the Mutum River, the littoral regions of which are covered with aquatic macrophytes, dominated by the species Eichhornia crassipes and Eichhornia azurea. To examine the ichthyofauna associated with this vegetation, in the year 2003, 3510 fish were collected, distributed among 83 species, and the limnological variables verified near the macrophyte stands where they were sampled. The most abundant and richest order was the Characiformes, followed by the Gymnotiformes and Siluriformes. Analysis of similarity showed a very low, or null, index that the limnological conditions and morphology of the aquatic macrophyte species provide habitat sufficiently homogeneous to give. The limnological conditions and morphology of the aquatic macrophyte species provide a sufficient habitat heterogeneity to give very low, or null, index values. Thus, environmental conservation measures should be more effective in promoting the conservation of the species, given the high levels of biological diversity found in the habitats studied.

scholarly journals Periphytic algae in a floodplain lake and river under low water conditions

2016 ◽  
Vol 16 (3) ◽  
Author(s):  
Andressa Bichoff ◽  
Nicolli Cristina Osório ◽  
Bárbara Dunck ◽  
Liliana Rodrigues
Keyword(s):  
Aquatic Macrophyte ◽  
Abiotic Factors ◽  
Abundant Species ◽  
Algal Community ◽  
Nitzschia Palea ◽  
Periphytic Algae ◽  
Eichhornia Azurea ◽  
Drought Conditions ◽  
Chemical Conditions ◽  
Physical And Chemical

Abstract Drought events will become more frequent due the climate change. In floodplains, periphytic algae are responsible for part of the primary production, are the principal source of organic carbon deposition, play an important role in mineralization and nutrient cycling, and are the base of the food web for many organisms. As algae distribution in aquatic environments is a strong indicator of physical and chemical conditions of the sites, we aimed to determine the structure of periphytic algae in lentic and lotic environments during drought conditions and to uncover the main local abiotic factors in community structuring. We hypothesized diatoms would be more frequent than green algae and desmids at both sites, due to their resistance characteristics, and that higher periphyton algal richness, density and diversity would occur in the lake due to the greater availability of nutrients and the absence of flow. The study was carried out in the Finado Raimundo lake and the Ivinhema river in the Upper Paraná river floodplain during the low water period of 2011. Petioles of the aquatic macrophyte Eichhornia azurea (Sw.) Kunth were used as a substrate for periphytic algae. We found a total of 171 species, 104 species in the lake and 80 in the river. Diatoms were predominant at both sites due to their strategic traits, and between sites, there were different patterns in the periphytic algal community structure, owing to the distinctive physical and chemical characteristics of the lake and the river. Achnanthidium minutissimum (Kützing) Czarnecki and Nitzschia palea (Kützing) W. Smith were the most abundant species in both environments. Our results showed patterns of periphytic algae in a floodplain during drought conditions, which will assist in understanding their structuring during future drought scenarios.

scholarly journals Patterns of the aquatic macrophyte cover in Cachoeira Dourada Reservoir (GO-MG)

2005 ◽  
Vol 65 (1) ◽  
pp. 19-24 ◽  
Author(s):  
L. M Bini ◽  
L. G Oliveira ◽  
D. C Souza ◽  
P. Carvalho ◽  
M. P. Pinto
Keyword(s):  
Aquatic Macrophytes ◽  
Positive Relationship ◽  
Aquatic Macrophyte ◽  
Main Body ◽  
Frequency Of Occurrence ◽  
Frequent Species ◽  
Eichhornia Azurea ◽  
The Relationship ◽  
Macrophyte Cover

The relationship between the aquatic macrophyte cover in upper segments of tributaries and this cover in these tributaries but near the reservoir's main body was tested. Sixteen taxa belonging to 12 families of aquatic macrophytes were recorded in Cachoeira Dourada Reservoir. The most frequent species were Eichhornia azurea (frequency of occurrence = 92%; n = 37 sites) and E. crassipes (44%). Upper segments of the tributaries were the main areas colonized by these aquatic macrophytes. The positive relationship between the aquatic macrophyte cover between the upper and lower segments of tributaries indicates the importance of dispersion in the colonization of the arms and the reservoir's main body.

scholarly journals Understanding Landscape Influences on Aquatic Fauna across the Central and Southern Appalachians

Land ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 16
Author(s):  
R. Daniel Hanks ◽  
Paul B. Leonard ◽  
Robert F. Baldwin
Keyword(s):  
Land Use ◽  
Multiple Stressors ◽  
Abiotic Factors ◽  
Biological Data ◽  
Aquatic Macroinvertebrates ◽  
Boosted Regression Trees ◽  
Southern Appalachians ◽  
Aquatic Macroinvertebrate ◽  
Aquatic Fauna ◽  
Spatial Coverage

For the success of aquatic conservation efforts, it is imperative for there to be an understanding of the influences multiple stressors across the landscape have on aquatic biota, as it provides an understanding of spatial patterns and informs regional stakeholders. The central and southern Appalachians contain biodiversity hotspots for aquatic fauna. Therefore, we sought to create a comprehensive multimetric model that is based on the influence of abiotic factors on fish and aquatic macroinvertebrates that could predict watershed quality. Good spatial coverage exists for land use/land cover (LULC) and other physicochemical components throughout the region, yet biological data is unevenly distributed, which creates difficulties in making informed management and conservation decisions across large landscapes. We used boosted regression trees (BRT) to model a variety of biological responses (fish and aquatic macroinvertebrate variables) to abiotic predictors and by combining model outputs created a single score for both abiotic and biotic values throughout the region. The mean variance that was explained by BRT models for fish was 73% (range = 48–85%) and for aquatic macroinvertebrates was 81% (range = 76–89%). We categorized both predictor and response variables into themes and targets, respectively, to better understand large scale patterns on the landscape that influence biological condition of streams. The most important themes in our models were geomorphic condition for fish and water quality for aquatic macroinvertebrates. Regional models were developed for fish, but not for aquatic macroinvertebrates due to the low number of sample sites. There was strong correlation between regional and global watershed scores for fish models but not between fish and aquatic macroinvertebrate models. We propose that the use of such multimetric scores can inform managers, NGOs, and private land owners regarding land use practices, thereby contributing to large landscape scale conservation efforts.

scholarly journals Water quality and communities associated with macrophytes in a shallow water-supply reservoir on an aquaculture farm

2014 ◽  
Vol 74 (2) ◽  
pp. 420-428 ◽  
Author(s):  
LH. Sipaúba-Tavares ◽  
SG. Dias
Keyword(s):  
Water Supply ◽  
Shallow Water ◽  
Aquatic Macrophyte ◽  
Strong Predictor ◽  
Good Alternative ◽  
Reservoir Water ◽  
Aquaculture Farm ◽  
Water State ◽  
Eichhornia Azurea ◽  
Water Supply Reservoir

Plankton communities and macrofauna associated to aquatic macrophyte stands in a shallow water-supply reservoir (21°14′09″S; 48°18′38″W) on an aquaculture farm were compared to evaluate the relationship between organism densities and some abiotic features of the reservoir. Water and communities associated were sampled at two sites, one in an area with the predominance of Eichhornia azurea (Sw.) Kunth and the other with the predominance of Salvinia auriculata Aublet. Communities associated with macrophytes were sampled with floating quadrants (0.5 m2); the macrophytes were washed and plankton and macrofauna were fixated with 4% formalin and 1% lugol iodine; the specimens were then identified and counted. Plankton and macrofauna communities associated with S. auriculata and E. azurea had a similar diversity of species but different (p<0.05) in the abundance of associated organisms. Eichhornia azurea had the highest contents in dry and wet weight, total phosphorus, total nitrogen and organic matter. Planktonic algae were directly correlated with biomass of E. azurea. The taxa with highest densities were Rotifera and Zygnematophyceae. Results showed that the environmental variables associated with macrophytes presence in the shallow reservoir is a strong predictor of favourable conditions to maintain great diversity plankton community and macrofauna associated with plants. The role of macrophytes is important for not only stabilising the clear-water state and maintaining high diversity of organisms associated, but also it seems to be a good alternative to maintaining desirable water-supply quality for aquaculture farms.

scholarly journals Owls as bioindicators: their spatial and temporal aspects in Eastern Europe

2019 ◽  
Vol 5 (2) ◽  
pp. 8-15
Author(s):  
Arthur Askeyev ◽  
Oleg Askeyev ◽  
Igor Askeyev
Keyword(s):  
Forest Ecosystems ◽  
Biological Diversity ◽  
Geographic Area ◽  
Winter Period ◽  
Temporal Aspects ◽  
Different Seasons ◽  
Large Geographic Area ◽  
The Republic ◽  
Term Data

Abstract The article presents the unique results of a study of the spatial distribution of owls in the territory of the Republic of Tatarstan by season of the year on long-term data. Ravkin’s transect method was used to census fixed randomly selected plots spread over a large geographic area. Abundance a lot of species of owls strong changed of different seasons of the year. In general, owls were indifferent to latitudinal, longitudinal, and altitude gradients in the territory of the Republic of Tatarstan, especially in winter and autumn periods. Probability of occurrences of boreal and pygmy owls can be used as indicators of the biological diversity of forest ecosystems in winter period.

scholarly journals Structure and ecological aspects of zooplankton (Testate amoebae, Rotifera, Cladocera and Copepoda) in highland streams in southern Brazil

2019 ◽  
Vol 31 ◽  
Author(s):  
Pablo Henrique dos Santos Picapedra ◽  
Cleomar Fernandes ◽  
Gilmar Baumgartner
Keyword(s):  
Environmental Conditions ◽  
Biological Diversity ◽  
Zooplankton Community ◽  
Testate Amoebae ◽  
Southern Brazil ◽  
Zooplankton Structure ◽  
Ecological Aspects ◽  
Adaptive Mechanisms ◽  
Different Seasons ◽  
Highland Streams

Abstract Aim: This study aimed to characterize the zooplankton structure in highland streams in southern Brazil, Pelotas River sub-basin, as well as the respective relationships with the environmental conditions in the different seasons. Methods Zooplankton was collected using a plankton net (68 µm mesh) and concentrated into a volume of 50 ml for later analysis in the laboratory. Sampling occurred during the winter (August 2013), spring (November 2013), summer (February 2014) and autumn (May 2014). Results Rotifers and testate amoebae were the predominant groups. Mean abundance, diversity and evenness varied considerably between the different seasons. The variability of zooplankton was correlated to environmental conditions (conductivity, suspended solids, pH, temperature and dissolved oxygen). Conclusions The seasonal variation of the zooplankton community made it possible to elucidate some questions involving the ecology of these organisms in highland streams in southern Brazil. These unique ecosystems warrant further research and monitoring efforts, including studies of their hydrological patterns, biological diversity and adaptive mechanisms of the zooplankton community.

scholarly journals Dynamics and Distribution of Marine Synechococcus Abundance and Genotypes during Seasonal Hypoxia in a Coastal Marine Ranch

2021 ◽  
Vol 9 (5) ◽  
pp. 549
Author(s):  
Guihao Li ◽  
Qinqin Song ◽  
Pengfei Zheng ◽  
Xiaoli Zhang ◽  
Songbao Zou ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Abiotic Factors ◽  
23S Rrna ◽  
Polymorphism Analysis ◽  
Coastal Zones ◽  
Internal Transcribed Spacer Region ◽  
Cell Abundance ◽  
Coastal Marine ◽  
Bottom Waters ◽  
Seasonal Hypoxia

Marine Synechococcus are an ecologically important picocyanobacterial group widely distributed in various oceanic environments. Little is known about the dynamics and distribution of Synechococcus abundance and genotypes during seasonal hypoxia in coastal zones. In this study, an investigation was conducted in a coastal marine ranch along two transects in Muping, Yantai, where hypoxic events (defined here as the dissolved oxygen concentration <3 mg L−1) occurred in the summer of 2015. The hypoxia occurred in the bottom waters from late July and persisted until late August. It was confined at nearshore stations of the two transects, one running across a coastal ranch and the other one outside. During this survey, cell abundance of Synechococcus was determined with flow cytometry, showing great variations ranging from 1 × 104 to 3.0 × 105 cells mL−1, and a bloom of Synechococcus occurred when stratification disappeared and hypoxia faded out outside the ranch. Regression analysis indicated that dissolved oxygen, pH, and inorganic nutrients were the most important abiotic factors in explaining the variation in Synechococcus cell abundance. Diverse genotypes (mostly belonged to the sub-clusters 5.1 and 5.2) were detected using clone library sequencing and terminal restriction fragment length polymorphism analysis of the 16S–23S rRNA internal transcribed spacer region. The richness of genotypes was significantly related to salinity, temperature, silicate, and pH, but not dissolved oxygen. Two environmental factors, temperature and salinity, collectively explained 17% of the variation in Synechococcus genotype assemblage. With the changes in population composition in diverse genotypes, the Synechococcus assemblages survived in the coastal hypoxia event and thrived when hypoxia faded out.

scholarly journals THE PRIMARY METABOLITES OF SARDINE (SARDINA PILCHARDUS) IN THE MOROCCAN NORTH ATLANTIC

2020 ◽  
Vol 8 (9) ◽  
pp. 1361-1369
Author(s):  
Wahbi Abderrazik ◽  
◽  
Seddik Nadia ◽  
Hmimid Fouzia ◽  
Schahrakane Yassine ◽  
...  
Keyword(s):  
North Atlantic ◽  
Abiotic Factors ◽  
Sardina Pilchardus ◽  
Primary Metabolites ◽  
Carbohydrate Reserves ◽  
Biotic And Abiotic Factors ◽  
Hydrological Parameters ◽  
Different Seasons ◽  
And Storage

Primary metabolites were determined in muscle, liver and gonads in sardines (Sardina pilchardus) captured in the Moroccan North Atlantic.It emerges from this study that in sardines, in the different seasons of the year, the lipid, protein and carbohydrate reserves are stored in the different organs. This important storage of metabolites in the gonads will undoubtedly be used for maturation while the reserves stored in muscle and liver will be used for the production of energy necessary for catadromous migration.In addition, there are other biotic and abiotic factors that influence the use and storage of these metabolites such as the quality and quantity of foods and hydrological parameters.

Water level thresholds of benthic macroinvertebrate richness, structure, and function of boreal lake stony littoral habitats

2011 ◽  
Vol 68 (10) ◽  
pp. 1695-1704 ◽  
Author(s):  
Michael S. White ◽  
Marguerite A. Xenopoulos ◽  
Robert A. Metcalfe ◽  
Keith M. Somers
Keyword(s):  
Community Structure ◽  
Water Level ◽  
Macroinvertebrate Community ◽  
Functional Mobility ◽  
Water Level Fluctuations ◽  
Benthic Macroinvertebrate ◽  
Functional Composition ◽  
Macroinvertebrate Communities ◽  
Taxa Richness ◽  
Littoral Habitats

We investigated the role of water level fluctuation on benthic macroinvertebrate communities of stony littoral habitats located in the Boreal Shield Ecozone. Using the reference condition approach (RCA), regression analysis, nonmetric multidimensional scaling (NMDS), and analysis of variance (ANOVA), we analyzed the benthic macroinvertebrate community structure of 20 natural lakes and 28 hydroelectric reservoirs to determine if they are structured by change in water level (amplitude). Along a gradient of amplitude intensity, we found that taxa richness decreases with increasing amplitude (r2 = 0.47–0.60). Littoral benthic macroinvertebrate community structure is significantly different in reservoirs that experience amplitudes > 2.0 m. Out of 28 reservoirs, 13 fell outside the 95.5% confidence ellipse determined by 20 reference lakes. Functional mobility group and functional feeding group composition are also altered with increasing amplitude (nonparametric ANOVA, P < 0.05). Further, a change in benthic macroinvertebrate functional composition occurs after a change in taxa richness. Interestingly, reservoirs that experienced amplitudes < 2.0 m had benthic macroinvertebrate communities whose structural and functional composition is similar to lakes experiencing natural water level fluctuations.

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