Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Diversity and abundance of aquatic macroinvertebrates in a lotic environment in Midwestern S o Paulo State, Brazil  [cached]
Fabio Laurindo da Silva,Diana Calcidoni Moreira,Sonia Silveira Ruiz,Gabriel Lucas Bochini
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2009,
Abstract: This study analyzed the diversity and abundance of aquatic macroinvertebrates community in the Vargem Limpa stream located in Bauru, Midwestern S o Paulo State, and characterized the water quality based on biological parameters. The sampling was carried out during the rain season (December, 2004). It was analyzed and identified 3,068 organisms belonging to 9 macroinvertebrate families. The system showed low richness and diversity of organisms in response to water quality.
Aquatic macroinvertebrates of the Jablanica river, Serbia
Stefanovi? Katarina S.,Nikoli? Vera P.,Tubi? Bojana P.,Tomovi? Jelena M.
Archives of Biological Sciences , 2009, DOI: 10.2298/abs0904787s
Abstract: Research on the community of aquatic macroinvertebrates was carried out during 2005 and 2006 at four sampling sites along the Jablanica River, a right-hand tributary of the Kolubara River. Fifty-seven taxa were recorded in the course of the investigation. The most diverse group was Ephemeroptera, followed by Trichoptera and Plecoptera. Members of the Rhitrogena semicolorata group were the most abundant. Our results could be the basis for evaluation of the influence of damming of the Jablanica River on the status of its water and can serve as a model for studying the influ-ence of hydromorphological degradation of aquatic ecosystems.
Results of the 2006 Sava survey: Aquatic macroinvertebrates
Paunovi? M.M.,Borkovi? Slavica S.,Pavlovi? S.Z.,Sai?i? Zorica S.
Archives of Biological Sciences , 2008, DOI: 10.2298/abs0802265p
Abstract: The paper presents some results of the 2006 Sava survey. The investigation was carried out at four locations along 188 km of the Serbian stretch of the Sava River (206 km of the river belongs to Serbia). Among other things (physical and chemical properties of water and sediment, phytoplankton, and phytobenthos), the study included investigation of aquatic macroinvertebrates. Sixty-two taxa were identified in this typical lowland river. Mollusks and oligochaetes were the most diverse groups of macroinvertebrates. Our results support the hypothesis that the Sava River is an important bio-invasion trajectory, a part of the Southern Invasive Corridor of Europe. Five alien macroinvertebrate taxa were identified, some of which (Corbicula fluminea, Branchyura sowerbyi, and Anodonta woodiana) were found to be important components of the community.
Are sugarcane leaf-detritus well colonized by aquatic macroinvertebrates?
Leite-Rossi, Luciene Aparecida;Trivinho-Strixino, Susana;
Acta Limnologica Brasiliensia , 2012, DOI: 10.1590/S2179-975X2012005000048
Abstract: aim: the aim was to compare the kinetics of decomposition and the colonization of leaf litter of two plant species, the native talauma ovata (pinha-do-brejo) and the exotic saccharum officinarum (sugarcane), by aquatic macroinvertebrates; methods: from each substrate, three recipients of colonization were taken from a stream, and the specimens identified to the lowest taxonomic level on days 7, 15, 34, 44, 61 and 75. the debris was weighed at the beginning and end of the experiment and determined their cell wall fractions; results: the coefficients of mineralization indicated higher velocity decay of organic matter refractory in t. ovata. there was no difference in taxonomic structure of macroinvertebrates, between the two substrates, but the community exhibited distinct functional feeding groups in the peak of colonization, with a greater number of shredders in t. ovata. the successive states of decomposition of the two plant detritus showed distinct macroinvertebrate densities; conclusions: the amount and state of the plant biomass were important factors influencing the density and diversity of the macroinvertebrate fauna throughout the process of organic decomposition.
Water quality and avian inputs as sources of isotopic variability in aquatic macrophytes and macroinvertebrates  [cached]
Esther Sebastian-Gonzalez,Joan Navarro,José Antonio Sanchez-Zapata,Francisco Botella
Journal of Limnology , 2012, DOI: 10.4081/mnol.2012.e20
Abstract: Different factors can affect the isotopic values of aquatic organisms. Nevertheless, water quality may be very important for aquatic organisms because they directly depend on it. In this article, we aimed to investigate if variations in the chemical and biological water characteristics affect the stable isotope values of aquatic organisms. We also wished to discuss alternative sources of isotopic variability. We analysed the water chemical characteristics, the input of extra nitrates from bird guano, and the δ15N and δ13C values for the macroinvertebrates and macrophytes present in freshwater irrigation ponds. Variability in the values of the analysed stable isotopes was high, even for the same species in different ponds. Water conductivity, nitrates, ammonium, organic nitrogen concentrations and COD (Chemical Oxygen Demand) directly correlated with the isotopic values. Besides, the input of extra nitrates from Larids’ (gulls and terns) guano might also increase the δ15N values at the ponds which these birds most intensively use. Nevertheless, the high δ15N values are difficult to explain in terms of water characteristics and excrements inputs and only general processes of denitrification could explain these values. Longer water residence times could cause extremely enriched isotopic values in both DIC (Dissolved Inorganic Carbon) and dissolved nitrates. This study shows different sources of isotopic variability which can prove useful to interpret stable isotopes studies.
Colonization of leaf litter of two aquatic macrophytes, Mayaca fluviatilis Aublet and Salvinia auriculata Aublet by aquatic macroinvertebrates in a tropical reservoir  [cached]
Fabio Laurindo da Silva,Heliana Rosely Neves Oliveira,Suzana Cunha Escarpinati,Alaide Aparecida Fonseca-Gessner
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2011,
Abstract: Decomposition and colonization of S. auriculata and M. fluviatilis by macroinvertebrates were analyzed during 40 days to determine whether differences existed on colonization by aquatic macroinvertebrates of two macrophytes with distinct habits (submerged versus fluctuant). Leaf litter of S. auriculata and M. fluviatilis were incubated in 24 litter bags (12 of each species), in a small reservoir surrounded by a cerrado fragment with low level of anthropic impact. After 10, 20, 30 and 40 days, the litter bags were removed and aquatic macroinvertebrates community was analyzed. Two hundred twenty macroinvertebrates were associated with S. auriculata and 261 were associated with M. fluviatilis, identified in 24 taxa. Both macrophyte species were colonized mainly by macroinvertebrate predators. Ablabesmyia with predator and collector food mechanisms was present in all sampling. The data showed an expressive increase of abundance during the process of decomposition and a decrease at the end of the experiment, in both macrophytes. Cluster analysis permitted inference that the colonization of the leaf liter by macroinvertebrates was determinated by incubation time of leaf litter not by the habit of macrophytes (submerged or fluctuant).
Qualitative composition of communities of aquatic macroinvertebrates along the course of the Golijska Moravica River (West-Central Serbia)  [PDF]
?ikanovi? Vesna,Jakov?ev-Todorovi? Dunja,Nikoli? Vera,Paunovi? M.
Archives of Biological Sciences , 2008, DOI: 10.2298/abs0801133d
Abstract: As the largest and most significant river of the Moravica region, the Golijska Moravica River arises below the highest peaks of the Golija Mountains. Faunistic-ecological research on aquatic macroinvertebrates was carried out during 2003 and 2004. Macrozoobenthos communities of the Golijska Moravica had not previously been the subject of any hydrobiological studies, and this was the main reason why we conducted their systematic and complex investigation. A list of taxa of aquatic macroinvertebrates is presented and their qualitative composition analyzed. During the period of investigation, a total of 13 groups and 147 taxa were found.
Short-Term Disturbance Effects of Outdoor Education Stream Classes on Aquatic Macroinvertebrates  [PDF]
Jon P. Bossley, Peter C. Smiley Smiley Jr.
Journal of Environmental Protection (JEP) , 2017, DOI: 10.4236/jep.2017.811082
Abstract: Outdoor education programs frequently offer stream classes that teach students how to assess water quality based on the composition of aquatic macroinvertebrate communities. Repeatedly using the same site for stream classes can cause disturbance that could negatively impact aquatic macroinvertebrates. However, the impact of outdoor education stream classes on short term temporal trends of aquatic macroinvertebrates has not been evaluated. Our objective was to quantify whether outdoor education stream classes caused localized and short-term impacts on the aquatic macroinvertebrate community. We sampled aquatic macroinvertebrates over a five day period in May 2014 from an impacted riffle subjected to repeated substrate disturbance by outdoor education stream classes and an unimpacted riffle that was not subjected to stream classes within an agricultural stream in central Ohio. We did not observe a difference in macroinvertebrate community response variables between different time periods or among days within the impacted riffle as part of our within riffle analysis. We documented that macroinvertebrate abundance and dorsoventrally flattened clinger abundance was greater within the unimpacted riffle than the impacted riffle. Macroinvertebrate evenness was greater in the impacted riffle than the unimpacted riffle. In the impacted riffle percent clingers was greater on Monday than on Friday. Conversely, in the unimpacted riffle percent clingers was greater on Friday than on Monday. Our results indicated that outdoor education stream classes did not alter short term temporal trends of macroinvertebrate community structure within an impacted riffle, but the stream classes resulted in differences in community structure between an impacted and unimpacted riffle. Our results suggest that outdoor education centers should avoid repeatedly using the same site for their stream classes to prevent negatively impacting aquatic macroinvertebrates.
Comparative studies of the feeding capacity and preference of Aphyosemion gularis (Boulenger 1901) on some aquatic macroinvertebrates  [PDF]
Okorie Anyaele & Abiodun Obemb
Journal of Vector Borne Diseases , 2011,
Abstract: Background & objectives: An efficient larvivorous fish must show a predilection for mosquito larvae in thepresence of alternative preys. This study compares the feeding capacity and preference of Aphyosemion gularisexposed to different kinds of aquatic macroinvertebrates.Methods: Various prey organisms such as Anopheles larvae and pupae, Culex larvae, chironomid larvae andostracods were either singly and/or jointly presented at different densities to the fish and the number of preyconsumed in 12 h light and dark periods were recorded.Results: The result showed that in terms of capacity and preference, the fish significantly consumed (p <0.05)more Anopheles larvae than pupae and more Anopheles larvae compared to Culex and chironomid larvae. It wasalso found that the fish preferred Culex larvae to chironomids larvae while significantly (p <0.05) more Anopheleslarvae were consumed compared to the more abundant ostracods.Conclusion: The results indicate that A. gularis is adapted to feed more on Anopheles than Culex larvae on onehand and generally preferred mosquito larvae to non-mosquito macroinvertebrates. The implication of thisobservation is that the presence of other non-mosquito organisms considered in this study is unlikely to divertthe attention of the fish from mosquito larvae, especially Anopheles larvae. The fact that the fish are able to feedon some of the non-mosquito organisms such as chironomids and ostracods, means that they can subsist on theseorganisms in the absence of mosquito larvae
Are the streams of the Sinos River basin of good water quality? Aquatic macroinvertebrates may answer the question
Bieger, L.;Carvalho, ABP;Strieder, MN;Maltchik, L.;Stenert, C;
Brazilian Journal of Biology , 2010, DOI: 10.1590/S1519-69842010000600010
Abstract: macroinvertebrate communities are one of the most used groups in assessments of water quality, since they respond directly to the level of contamination of aquatic ecosystems. the main objective of this study was the assessment of the water quality of the sinos river basin (rio grande do sul state, brazil) through biotic indices based on the macroinvertebrate community ("family biotic index - fbi", and "biological monitoring working party score system - bmwp"). three lower order streams (2nd order) were selected in each one of three main regions of the basin. in each stream, the samplings were performed in three reaches (upper, middle, and lower), totalling 27 reaches. two samplings were carried in each reach over one year (winter and summer). a total of 6,847 macroinvertebrates distributed among 54 families were sampled. the streams from the upper region were of better water quality than the lower region. the water quality did not change between the upper, middle and lower reaches of the streams. however, the upper reaches of the streams were of better water quality in all the regions of the basin. the water quality of the streams did not vary between the summer and the winter. this result demonstrated that water quality may be analysed in both studied seasons (summer and winter) using biotic indices. the analysis of the results allows us to conclude that the biotic indices used reflected the changes related to the water quality along the longitudinal gradient of the basin. thus, aquatic macroinvertebrates were important bioindicators of the water and environmental quality of the streams of the sinos river basin.
Page 1 /100
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.