scholarly journals The successional phases of a periphytic algal community in a shallow tropical reservoir during the dry and rainy seasons

Limnetica ◽  
2013 ◽  
pp. 337-352
Author(s):  
Rodrigues dos Santos, Thiago ◽  
Ferragut, Carla
Keyword(s):  
Algal Community ◽  
Tropical Reservoir ◽  
Dry And Rainy Seasons

scholarly journals Periphyton nutrient content, biomass and algal community on artificial substrate: response to experimental nutrient enrichment and the effect of its interruption in a tropical reservoir

Limnology ◽  
2017 ◽  
Vol 19 (2) ◽  
pp. 209-218 ◽  
Author(s):  
Suele Aparecida Mendes Santos ◽  
Thiago Rodrigues dos Santos ◽  
Mariana S. R. Furtado ◽  
Raoul Henry ◽  
Carla Ferragut
Keyword(s):  
Nutrient Enrichment ◽  
Nutrient Content ◽  
Artificial Substrate ◽  
Algal Community ◽  
Tropical Reservoir

scholarly journals Influence of substratum surface roughness on periphytic algal community structure in a shallow tropical reservoir

2013 ◽  
Vol 24 (4) ◽  
pp. 397-407 ◽  
Author(s):  
Mariane Lima de Souza ◽  
Carla Ferragut
Keyword(s):  
Surface Roughness ◽  
Community Structure ◽  
Algal Community ◽  
Total Density ◽  
Tropical Reservoir ◽  
Roughness Surface ◽  
Advanced Phase ◽  
Significant Difference ◽  
High Roughness ◽  
Colonization Time

AIM: This study aimed to evaluate the algal periphytic community structure on substrates with differing surface roughness in early and longer-term colonization; METHODS: Periphyton was sampled after 30 days (June 24 to July 24, 2008) and 5 days (July 07 to July 12, 2010) substrate exposure during dry season. Plastic slides were used as artificial substrate. Treatments were smooth surface (control), low roughness, medium roughness and high roughness. Samples were collected for limnological condition and periphyton (chlorophyll-a, AFDM, algal biovolume and density, species richness and diversity) analysis; RESULTS: Periphytic biomass, algal density and biovolume had no significant difference among treatments after 30 and 5 days colonization time. Taxonomic similarity was the lowest among treatments and the greatest difference occurred between control and treatments with roughness surface. Bacillariophyceae biovolume decreased with increasing surface roughness. Adherence forms, algal classes and species descriptors were significantly different after 5 days colonization time, especially in medium e high roughness surface. In the colonization advanced phase only species descriptors differ among treatments. Periphytic algae with pads and stalks for adherence decreased with increasing surface roughness. CONCLUSION: Substrate physical properties had little or no influence on periphyton biomass accumulation, total density and biovolume in this study, but algal assemblages were sensitive to changes in the microtopography. More studies are needed to increase understanding of the relation substrate-periphyton in tropical ecosystems.

scholarly journals Biomass and abiotic variables change in phytotelmic environment in the tank-bromeliad Nidularium longiflorum Ule in tropical forest

2019 ◽  
Vol 31 ◽  
Author(s):  
Karina Margaret Silva das Neves ◽  
Armando Reis Tavares ◽  
llka Schincariol Vercellino ◽  
Carla Ferragut
Keyword(s):  
Chlorophyll A ◽  
Environmental Conditions ◽  
Biomass Accumulation ◽  
Dry Mass ◽  
Algal Community ◽  
Site Characteristics ◽  
Abiotic Variables ◽  
Aquatic Microcosm ◽  
Tank Bromeliad ◽  
Dry And Rainy Seasons

Abstract Aim Phytotelm plays an important role in plant growth and ecosystem functioning, but this natural aquatic microcosm is poorly known. We evaluated the seasonal (dry and rainy seasons) and spatial variations (forest trail and stream sites) of the phytotelm in Nidularium longiflorum, bromeliad that occurs in the Atlantic Forest. Methods Abiotic and biotic variables were measured in tank-bromeliad phytotelms. The biomass was analyzed by ash-free dry mass and chlorophyll-a concentration. Results Abiotic variables measured in the phytotelmic environment of bromeliads varied between sampling sites and seasons. Temperature, electrical conductivity and total nitrogen values were significantly different between seasons and sites. Chlorophyll-a and ash-free dry mass (organic matter) in phytotelm were significantly different between sampling sites. Eleven genera of algae in the phytotelm were identified. PCA axis 1 ordination evidenced the seasonal variation of environmental conditions. Conclusions Our findings suggest that environmental and micro-environmental conditions do not favor the development of algal community in the phytotelm. Biomass and abiotic variables in phytotelm of Nidularium longiflorum change seasonally, however biomass accumulation was strongly influenced by site characteristics.

Periphytic algal community structure in relation to seasonal variation and macrophyte richness in a shallow tropical reservoir

Hydrobiologia ◽  
2015 ◽  
Vol 755 (1) ◽  
pp. 183-196 ◽  
Author(s):  
Mariane Lima de Souza ◽  
Barbara Golebski Pellegrini ◽  
Carla Ferragut
Keyword(s):  
Community Structure ◽  
Seasonal Variation ◽  
Algal Community ◽  
Tropical Reservoir

STUDI BIONOMIK VEKTOR MALARIA DI KECAMATAN KALIBAWANG, KULONPROGO

2018 ◽  
Vol 4 (2) ◽  
Author(s):  
Sardjito Eko Windarso dkk
Keyword(s):  
Land Use ◽  
Malaria Vector ◽  
Rainy Season ◽  
Dry Season ◽  
Physical Factors ◽  
Mosquito Vector ◽  
Anopheles Species ◽  
Commercial Farming ◽  
Study Results ◽  
Dry And Rainy Seasons

The increasing of malaria cases in recent years at Kecamatan Kalibawang has been suspected correspond with the conversion of farming land-use which initiated in 1993. Four years after the natural vegetation in this area were changed become cocoa and coffee commercial farming estates, the number of malaria cases in 1997 rose more than six times, and in 2000 it reached 6085. This study were aimed to observe whether there were any differences in density and diversity of Anopheles as malaria vector between the cocoa and mix farming during dry and rainy seasons. The results of the study are useful for considering the appropriate methods, times and places for mosquito vector controlling. The study activities comprised of collecting Anopheles as well as identifying the species to determine the density and diversity of the malaria vector. Both activities were held four weeks in dry season and four weeks in rainy season. The mea-surement of physical factors such as temperature, humidity and rainfall were also conducted to support the study results. Four dusuns which meet the criteria and had the highest malaria cases were selected as study location. Descriptively, the results shows that the number of collected Anopheles in cocoa farming were higher compared with those in mix horticultural farming; and the number of Anopheles species identifi ed in cocoa farming were also more varied than those in the mix horticultural farming.Key words: bionomik vektor malaria, anopheles,

scholarly journals Trophic State Evolution over 15 Years in a Tropical Reservoir with Low Nitrogen Concentrations and Cyanobacteria Predominance

2016 ◽  
Vol 227 (3) ◽  
Author(s):  
Frederico Guilherme de Souza Beghelli ◽  
Daniele Frascareli ◽  
Marcelo Luiz Martins Pompêo ◽  
Viviane Moschini-Carlos
Keyword(s):  
Trophic State ◽  
Tropical Reservoir ◽  
State Evolution ◽  
Nitrogen Concentrations ◽  
Low Nitrogen

scholarly journals Water quality drives the regional patterns of an algal metacommunity in interconnected lakes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Min Sung Kim ◽  
Seok Hyun Ahn ◽  
In Jae Jeong ◽  
Tae Kwon Lee
Keyword(s):  
Water Quality ◽  
Community Assembly ◽  
River Flow ◽  
Geographical Area ◽  
Oxygen Demand ◽  
Algal Community ◽  
Regional Patterns ◽  
Algal Communities ◽  
Species Sorting ◽  
Metacommunity Structure

AbstractThe metacommunity approach provides insights into how the biological communities are assembled along the environmental variations. The current study presents the importance of water quality on the metacommunity structure of algal communities in six river-connected lakes using long-term (8 years) monitoring datasets. Elements of metacommunity structure were analyzed to evaluate whether water quality structured the metacommunity across biogeographic regions in the riverine ecosystem. The algal community in all lakes was found to exhibit Clementsian or quasi-Clementsian structure properties such as significant turnover, grouped and species sorting indicating that the communities responded to the environmental gradient. Reciprocal averaging clearly classified the lakes into three clusters according to the geographical region in river flow (upstream, midstream, and downstream). The dispersal patterns of algal genera, including Aulacoseira, Cyclotella, Stephanodiscus, and Chlamydomonas across the regions also supported the spatial-based classification results. Although conductivity, chemical oxygen demand, and biological oxygen demand were found to be important variables (loading > |0.5|) of the entire algal community assembly, water temperature was a critical factor in water quality associated with community assembly in each geographical area. These results support the notion that the structure of algal communities is strongly associated with water quality, but the relative importance of variables in structuring algal communities differed by geological regions.

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