Artykuły w czasopismach na temat „Stream fauna”
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Clifford, Hugh F., Gillian M. Wiley i Richard J. Casey. "Macroinvertebrates of a beaver-altered boreal stream of Alberta, Canada, with special reference to the fauna on the dams". Canadian Journal of Zoology 71, nr 7 (1.07.1993): 1439–47. http://dx.doi.org/10.1139/z93-199.
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There were different macroinvertebrate assemblages on the face of and in beaver dams compared with beaver ponds and main stream sites. The beaver dam featured a large proportion of simuliid larvae compared with the main stream sites of this stream and with areas of other studies of beaver-altered streams. The fauna of the dams was typical of fast-flowing habitats, whereas animals of the main stream sites (including the beaver ponds) were more characteristic of slow-flowing or lentic habitats. Cluster analysis separated the dam and main stream sites for each sampling date and year of our study based on the composition of the macroinvertebrates. Although the invertebrate assemblages of the dams differed from those of the main stream sites, both habitats included similar functional feeding groups, except for a shredder found only at the dams. There are similarities between the beaver dam fauna and the faunas of debris dams, woody snags, and lake outlets. Beaver dams are important in supporting large populations of simuliids and generally in maintaining a lotic fauna in slow-moving, low-gradient boreal streams.
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Crisci-Bispo, Vera L., Pitágoras C. Bispo i Claudio G. Froehlich. "Ephemeroptera, Plecoptera and Trichoptera assemblages in two Atlantic Rainforest streams, Southeastern Brazil". Revista Brasileira de Zoologia 24, nr 2 (czerwiec 2007): 312–18. http://dx.doi.org/10.1590/s0101-81752007000200007.
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Assemblages of Ephemeroptera, Plecoptera and Trichoptera (EPT) of rocky substrates were studied in two streams of the Intervales State Park. Monthly collections with a Surber sampler (10 random sampling units, 1m²) were carried out from September 1999 to September 2000 and quarterly from December 2000 to September 2001 in the Bocaina and Água Comprida Streams. The EPT fauna in the Bocaina Stream was more diversified and more abundant than in the Água Comprida Stream. The EPT fauna was quite different in the two streams both in composition as in functional aspects. The results of this study indicate that there was not a clear seasonal pattern in the temporal variation of density.
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Couceiro, S. R. M., B. R. Forsberg, N. Hamada i R. L. M. Ferreira. "Effects of an oil spill and discharge of domestic sewage on the insect fauna of Cururu stream, Manaus, AM, Brazil". Brazilian Journal of Biology 66, nr 1a (luty 2006): 35–44. http://dx.doi.org/10.1590/s1519-69842006000100006.
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Assemblages of aquatic and edaphic insects in three streams in Central Amazonia were used to evaluate the impact on one of the streams (Cururu) caused by an oil spill that occurred in August 1999. The Cururu stream had already been impacted by domestic sewage. These three streams were evaluated during four different periods of the regional hydrological cycle (falling-, low-, rising- and high-water), from September 2000 to May 2001. An Eckman dredge, an aquatic entomological net and a manual auger were used to collect insects, which were used to estimate the taxonomic richness (at the family level) and insect density in each stream. Anoxic and eutrophic conditions were determined in each stream based on the mean concentration of dissolved oxygen, total nitrogen and phosphorus. Richness and abundance of insect fauna were higher in the Cristalino stream (not impacted) than in the Bom Jardim stream (impacted by domestic sewage) and in the Cururu stream, with the exception of samples collected along the stream banks (littoral fauna). The mean dissolved oxygen was lower in the Cururu stream than in the other two, while the mean concentrations of total nitrogen and phosphorus were higher. These elements showed intermediate values in the Bom Jardim stream, while the opposite pattern was observed in the Cristalino stream, with higher concentrations of dissolved oxygen and lower concentrations of total nitrogen and phosphorus. The concentrations of these variables reflect the modifications resulting from anthropogenic eutrophication caused by the discharge of domestic sewage into Bom Jardim and Cururu and by the oil spill in Cururu, which negatively affected the richness and abundance of insects in these streams.
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Crisci-Bispo, Vera L., Pitágoras C. Bispo i Claudio G. Froehlich. "Ephemeroptera, Plecoptera and Trichoptera assemblages in litter in a mountain stream of the Atlantic Rainforest from Southeastern Brazil". Revista Brasileira de Zoologia 24, nr 3 (2007): 545–51. http://dx.doi.org/10.1590/s0101-81752007000300004.
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The study of Ephemeroptera, Plecoptera and Trichoptera associated with litter in southeastern Brazil streams aimed to answer the following questions: 1) Does richness and composition of EPT fauna differ between riffle and pool mesohabitats despite being associated to the same substratum, litter? 2) Does the similarity of the EPT fauna between both mesohabitats change with time? 3) Does the EPT functional feeding structure differ between both mesohabitats (riffles-pools)? In order to answer these questions, monthly collections, from November 1999 to June 2000, were done in Ribeirão (Stream) Bocaina with a D-net (10 litter patches in riffles and 10 in pools). The EPT fauna at Ribeirão Bocaina was more diversified and more abundant in the litter in riffles than in the litter in pools, although, when richness was standardized for the same number of individuals it became similar in both conditions. EPT fauna was very different between both mesohabitats in terms of faunal composition as well as in terms of function. Probably it was due to differences in water speed, in the time of litter residence and in the concentration of dissolved oxygen between both mesohabitats.
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Vidotto-Magnoni, Ana Paula, Diego Azevedo Zoccal Garcia, Alexandro Derly Augusto Costa, Jaqueline Garcia de Souza, Marcelo Hideki Shigaki Yabu, Fernanda Simões de Almeida i Mário Luís Orsi. "Ichthyofauna of streams of the Lower Paranapanema River basin, state of Paraná, Brazil". Check List 11, nr 5 (2.10.2015): 1756. http://dx.doi.org/10.15560/11.5.1756.
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Several studies of small watersheds of in the Upper Paraná River basin are currently available. Howev-er, the number and extent of its tributary streams still pose a challenge to enhancing current knowledge of their ichthyofauna. This study aimed to survey the fish fauna of three streams of the Lower Paranapanema River basin, state of Paraná, Brazil (Capim, Tenente and Centenário streams). The sampling included 3,167 specimens belonging to five orders, 17 families and 56 species. The streams presented differences in species richness (Centenário Stream: 41 species; Tenente Stream: 33 species; Capim Stream: 30 species). Two species occurred at all collection sites (Astyanax bockmanni and Hypostomus ancistroides). Nine non-native species were recorded, four of them found exclusive-ly in the Centenário Stream.
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Akindele, Emmanuel O., i Godwin O. Olutona. "Water Physicochemistry and Zooplankton Fauna of Aiba Reservoir Headwater Streams, Iwo, Nigeria". Journal of Ecosystems 2014 (19.11.2014): 1–11. http://dx.doi.org/10.1155/2014/105405.
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The physicochemical water condition and zooplankton fauna of the two main inflows of Aiba Reservoir were assessed over an annual hydrological cycle (May 2013–March 2014). The concentrations of total solids (TS) and total suspended solids (TSS) in the two streams were unusually higher in the dry season for typical inland waters of Nigeria and showed a decrease from the upper reaches towards the lower reaches (reservoir’s inlet). Dissolved oxygen, NO3-, and PO43- recorded their highest concentrations at the reservoir’s inlet. A total of 37 species of zooplankton were recorded in the study, comprising 5 species of Protozoa, 14 species of Rotifera, 10 species of Copepoda, 4 species of Ostracoda, and 4 species of Insecta. Aiba stream recorded higher number of zooplankton species and abundance than Onikan stream. While number of zooplankton species and abundance showed an increase from the upper reaches to the lower reaches of both streams, species diversity and equitability generally showed a decrease. Correlation and regression analysis suggests that the concentration of TS and TSS played a major role in determining the zooplankton community structure of the streams. PO43- concentrations as well as the community structures of zooplankton faunas of the two streams were indicative of a polluted freshwater system with unstable habitat structure.
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McNie, Pierce M., i Russell G. Death. "The effect of agriculture on cave-stream invertebrate communities". Marine and Freshwater Research 68, nr 11 (2017): 1999. http://dx.doi.org/10.1071/mf16112.
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The impacts that land-use changes have on cave-stream fauna have not been considered widely in the investigations of land-use impacts on stream ecology. The present study examines how above-ground agriculture may influence cave-stream invertebrate communities. The invertebrate communities in four cave streams and their surface counterparts were sampled in 2014–2015, including two drained predominantly agricultural catchments and two drained forested catchments. These communities were examined alongside habitat and GIS land-use data to determine the relationship between above-ground land use and the stream communities. Invertebrate community composition and ecological health for surface streams was different between the agricultural and forest catchments. These differences were less pronounced within the cave-stream communities. Sedimentation was the principal agricultural stressor in the cave streams. The overall effects of agriculture were lower within the cave streams than on the surface; this is likely to be due to the reduced number of potentially deleterious stressors on cave streams.
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Henriques-Oliveira, Ana Lucia, i Jorge Luiz Nessimian. "Aquatic macroinvertebrate diversity and composition in streams along an altitudinal gradient in Southeastern Brazil". Biota Neotropica 10, nr 3 (wrzesień 2010): 115–28. http://dx.doi.org/10.1590/s1676-06032010000300012.
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Aquatic macroinvertebrate diversity and composition in streams along an altitudinal gradient in Southeastern Brazil. A study concerning taxonomic richness and composition of the aquatic insect fauna in streams within the same catchment basin along an altitudinal gradient in Southeast Brazil, was conducted to test the hypothesis that there is a faunal discontinuity in the biocenotic composition, related to differences in altitude and latitude. In Southeastern Brazil, around latitude 22°, this faunal transition from rhithron to potamon biocenosis should occur at 500 m above sea level. Eighteen tributaries of the Mambucaba River, at Serra da Bocaina National Park, SP-RJ, Brazil, were studied. The streams were separated into 6 altitudinal zones (zone 1: above 1500 m; zone 2: 1200-1300 m; zone 3: 900-1000 m; zone 4: 400-700 m; zone 5: 100-300 m; and zone 6: 0-100 m) each including three streams. The aquatic insects were identified at the lowest possible taxonomic level. The highest richness was observed in altitudes between 1200-1300 m, while the lowest occurred in altitudes below 100 m. The Indicator Value method indicated taxa characteristic for four of the six altitudinal zones considered in this paper. Sorensen's Index and CCA results showed that distribution and composition of aquatic insect fauna of Serra da Bocaina National Park was influenced primarily by altitude and temperature rather than stream size. The absence of indicator species and the lower abundance in altitudes between 400-700 m suggest a transition from rhithral to potamal fauna, which is distinct at 200 m.
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Omoniyi, Gbenga E., Christophe Piscart, Laura Pellan i Benjamin Bergerot. "Responses of Macroinvertebrate Communities to Hydromorphological Restoration of Headwater Streams in Brittany". Water 14, nr 4 (12.02.2022): 553. http://dx.doi.org/10.3390/w14040553.
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Indices of fauna communities, including macroinvertebrates, have been widely used as indicators of environmental changes in streams with great success. However, in the evaluations of in-stream restorations, results from the deployment of macroinvertebrate community indices as bio-indicators have been inconclusive, with scanty evidence for success. This study aims to determine if in headwater streams, and particularly according to the type of in-stream restoration studied (i.e., suppression of concrete pipe), bio-indicators based on macroinvertebrate can be relevant. We monitored three headwater stream reaches where artificial structures constituting hydromorphological impairments to the streams were removed. We collected macroinvertebrate samples from impacted stream sections and control sites established along the streams. Samples were collected before and after the restoration activities, in a before-after-control-impact (BACI) study design. We used two macroinvertebrate-based multimetric tools (I2M2 and ERA) to evaluate the ecological status of the streams, based on macroinvertebrate community indices, and to identify the relative contributions of watershed anthropic pressures to the ecological status. We found that the removal of the artificial structures and the restoration of natural flow were successful in reducing clogging. However, only taxonomic richness showed a positive significant change. The results indicate that the presence of confounding factors, not addressed by the restoration works, may have been responsible for this minimal success in biodiversity recovery. Although the multimetric assessment tools were able to differentiate between streams and disentangle the effects of multiple pressures contributing to degradation in the streams, they were limited to a level below the watershed scale. Our results showed that for a better outcome for macroinvertebrate biodiversity improvement, methods of in-stream restorations must consider the multiple pressures contributing to the degradation of fauna communities in watersheds.
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Koyun, Mustafa, Bülent Gül i Nimetullah Korkut. "The Fish Fauna of Göynük Stream (Bingöl)". Commagene Journal of Biology -, nr - (30.06.2018): 39–47. http://dx.doi.org/10.31594/commagene.403367.
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Cruz, Bruna Botti, Fernanda Ayumi Teshima i Mauricio Cetra. "Trophic organization and fish assemblage structure as disturbance indicators in headwater streams of lower Sorocaba River basin, Sao Paulo, Brazil". Neotropical Ichthyology 11, nr 1 (marzec 2013): 171–78. http://dx.doi.org/10.1590/s1679-62252013000100020.
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Studies that investigate the relationship patterns between environmental structure complexity and fish fauna provide crucial information to stream restoration efforts. In order to test the hypothesis that streams with more complex environmental structure sustain more diverse and functionally more complex fish communities we sampled fish fauna from Sorocaba River headwater stream reaches (SE - Brazil). Reaches represented two distinct treatments: (1) a simplified reach, characterized by unstable fine substrate, clay, deeper channel and higher water velocity and (2) structurally complex reaches, characterized by coarse substrate, with gravel, pebble, rock, stems and branches and leaves inside the channel, producing a diverse pattern of microhabitat, associated with sequences of pools, runs, and riffles. Both trophic structure and taxonomic composition varied significantly between treatments. Invertivorous trophic group exclusively occurred in structurally complex reaches, which also presented greater diversity and species richness. We suggest enhancing in-stream environmental structure that suffered simplification processes due to human impacts in order to reestablish fish communities and ecossistemic functioning.
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Cherchesova, Susanna, Ia Dzioeva, Oleg Novatorov i Elvira Gassieva. "Ecological and faunal features of the streams of the Gizeldon River basin". E3S Web of Conferences 265 (2021): 01017. http://dx.doi.org/10.1051/e3sconf/202126501017.
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The fauna of unnamed streams of the Gizeldon River basin was studied, the habitat conditions were determined, the structure of litoreophilic biocenoses was revealed, and the analysis of stream and river biotopes was conducted. As a result of the research, 48 species from 28 genera, 37 families, 12 orders, 6 classes and 4 types were identified for the Gizeldon River basin. The greatest diversity is found in the fauna of streams (30 species) – 35%, for the Gizeldon River, including the branches – 26 species (32 %) have been identified, in Genaldon-17 species (20%) and in the backwaters 11 species (13%) have been recorded
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Freeman, Mary, Duncan Elkins, Peter Maholland, Zachary Butler, Maxwell Kleinhans, Jonathon Skaggs, Edward Stowe, Carrie Straight i Seth Wenger. "Slow Recovery of Headwater-Stream Fishes Following a Catastrophic Poisoning Event". Journal of Fish and Wildlife Management 12, nr 2 (9.06.2021): 362–72. http://dx.doi.org/10.3996/jfwm-20-080.
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Abstract Accidental spills of chemicals and other pollutants can decimate populations of stream-dwelling species. Recovery from such accidents can be relatively fast and complete when the affected stream reaches can be recolonized from upstream and downstream sources. However, faunal recoveries from accidental spills that extirpate populations from entire headwater streams have not been extensively documented, and understanding resilience of headwater-stream biota is relevant for assessing threats to at-risk species. We assessed recovery of fish populations in a 5.7-km-long headwater stream in the southeastern United States following a complete, or nearly complete, fish-kill caused by a chemical spill near the source of the stream. We sampled for fishes at five stream locations, two downstream and three upstream from a perched, culverted road-crossing located 2.4 km upstream from the stream mouth, over a period of 18.5 mo following the poisoning event. We observed 11 fish species, representing ≤65% of the fish species expected based on occurrences in nearby tributary streams. In postpoisoning sampling, only three of these taxa were observed upstream of the culvert; all 11 species, including the federally threatened Cherokee Darter Etheostoma scotti, were found downstream of the culvert but were mostly represented by a few, large individuals. In contrast, dead individuals of at least eight taxa including the Cherokee Darter were observed upstream of the culvert at the time of the fish-kill. These observations provide evidence of slow recovery of a headwater fish fauna, and especially upstream of a barrier to fish movement, where the recolonization sources are primarily downstream. Additional case studies may reveal whether this result applies generally to headwater streams. Slow recovery could make species that primarily inhabit or maintain greatest abundances in headwaters, including multiple at-risk fishes, particularly vulnerable to the threat of accidental spills that result in local population extirpation.
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Ebner, Brendan C., Christopher J. Fulton, Stephen Cousins, James A. Donaldson, Mark J. Kennard, Jan-Olaf Meynecke i Jason Schaffer. "Filming and snorkelling as visual techniques to survey fauna in difficult to access tropical rainforest streams". Marine and Freshwater Research 66, nr 2 (2015): 120. http://dx.doi.org/10.1071/mf13339.
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Dense tropical rainforest, waterfalls and shallow riffle-run-pool sequences pose challenges for researcher access to remote reaches of streams for surveying aquatic fauna, particularly when using capture-based collecting techniques (e.g. trapping, backpack and boat electrofishing). We compared the detection of aquatic species (vertebrates and invertebrates >1cm in body length) within pool habitats of a rainforest stream obtained by two visual techniques during both the wet and dry season: active visual survey by snorkelling and baited remote underwater video stations (BRUVSs). Snorkelling detected more species than a single BRUVS at each site, both within and among seasons. Snorkelling was most effective for recording the presence and abundance of diurnally active small-bodied species (adult size <150mm total length), although both techniques were comparable in detecting large-bodied taxa (turtles, fish and eels). On the current evidence, snorkelling provides the most sensitive and rapid visual technique for detecting rainforest stream fauna. However, in stream sections dangerous to human observers (e.g. inhabited by crocodiles, entanglement, extreme flows), we recommend a stratified deployment of multiple BRUVSs across a range of stream microhabitats within each site.
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Bispo, Pitágoras C., i Leandro G. Oliveira. "Diversity and structure of Ephemeroptera, Plecoptera and Trichoptera (Insecta) assemblages from riffles in mountain streams of Central Brazil". Revista Brasileira de Zoologia 24, nr 2 (czerwiec 2007): 283–93. http://dx.doi.org/10.1590/s0101-81752007000200004.
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The diversity and structure of Ephemeroptera, Plecoptera and Trichoptera (EPT) assemblages in streams of Central Brazil (Serra dos Pireneus, Pirenópolis, State of Goiás) was investigated. Abundance data of EPT were obtained in Central-West Brazilian streams in order to evaluate the effect of spatial variability, including the effect of size of the stream and anthropic action, and seasonality (dry and rainy seasons) on faunal diversity and structure. The immatures were collected with circular sieves (0. 5 mm mesh) during one hour at five collection stations over 14 months. From a spatial point of view, the data showed that anthropic action determined the patterns of diversity whereas the size of streams (1st and 3rd-4th orders) determined the faunistic composition. In addition, environmental seasonality was an important factor for structuring the EPT fauna.
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Larentis, Crislei, Bruna Caroline Kotz Kliemann, Mayara Pereira Neves i Rosilene Luciana Delariva. "Effects of human disturbance on habitat and fish diversity in Neotropical streams". PLOS ONE 17, nr 9 (9.09.2022): e0274191. http://dx.doi.org/10.1371/journal.pone.0274191.
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Human pressures have been intensely modifying freshwater ecosystems worldwide. We assessed the effects of human pressure on habitat diversity and primary productivity to understand the consequences on fish fauna in 25 tropical and subtropical streams of two globally important ecoregions: Iguassu and Upper Paraná. We hypothesized that the increased human pressure (urbanization and agriculture) on stream environments, both at the local and catchment scales, directly decreases habitat diversity. We also hypothesized that increased human pressure triggers changes in primary productivity and fish fauna composition and structure. We evaluated the human pressure intensity using the Integrated Disturbance Index and the Rapid Habitat Diversity Assessment protocol, which combines information about land use, land cover and environmental characteristics of the stream catchment and sampling sites. Streams with increased human disturbance had lower habitat diversity, higher primary productivity, and high non-native species abundance. Fish compositional turnover was associated with increased human disturbance. Native and degradation-sensitive fish species, especially endemic ones, were associated with streams with higher habitat diversity and forested cover. Degradation-resistant fishes, mostly non-native species, were associated with streams with higher human disturbance and urban land use. Although human pressure did not affect species richness, Shannon diversity, and Simpson dominance, there were significant effects on numerical abundance and fish species equitability. In this study, human pressure directly affected habitat structure, with indirect consequences for fish fauna, increasing the potential for local extirpation of rare species.
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Oglęcki, Paweł, i Artur Radecki-Pawlik. "The macroinvertebrate fauna of the Młynne stream (Polish Carpathians) in the aspect of the bed load transport and water quality". Annals of Warsaw University of Life Sciences, Land Reclamation 47, nr 4 (1.12.2015): 321–32. http://dx.doi.org/10.1515/sggw-2015-0034.
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Abstract The macroinvertebrate fauna of the Młynne stream (Polish Carpathians) in the aspect of the bed load transport and water quality. The qualitative composition of the bottom sediments and the bed load and suspended load transport along the mountain stream were presented. The studies were carried on the Młynne stream in Gorce (Polish Carpathians). The streams flows partially in the natural river-bed and partially in the regulated with rapids. The stream bed load is accumulated in the reservoir up to the check dam and is qualitatively different from the load deposited at the bars. The taxonomic richness of the Młynne stream is a little bigger compared with the other investigated mountain and sub-mountain streams, but lesser compared with bigger rivers. The number of taxa on the natural reaches is more than double than on the regulated ones, with more taxa of high environmental demands and high values of the BMWP-PL index. The paper brings up the question of the environmental friendly technical solutions in different human activities in the sub-mountain and mountain river valleys, advantageous for humans and the river biological diversity (or resistance for negative environmental factors) as well.
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Yule, Catherine Mary. "Trophic relationships and food webs of the benthic invertebrate fauna of two aseasonal tropical streams on Bougainville Island, Papua New Guinea". Journal of Tropical Ecology 12, nr 4 (lipiec 1996): 517–34. http://dx.doi.org/10.1017/s0266467400009755.
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ABSTRACTThe trophic ecology of Konaino Creek, a small mountain headwater stream draining rainforest in the aseasonal tropics on Bougainville Island, Papua New Guinea, was examined and a food web was constructed. The major source of energy in Konaiano Creek was allochthonous detritus, most of which had been terrestrially degraded to fine particulate organic matter rather than entering the stream as leaf litter. This fine detritus was collected by the filter-feeders (mostly Simuliidae and also Hydropsychidae) which formed the dominant functional feeding group (64.4% of the fauna). Thus filterers processed most of the allochthonous detritus and made the energy available to other trophic levels, rather than shredders (1.7% of the fauna) which perform this role in temperate headwater streams. Collector-gatherers made up 22.7% of the fauna, carnivorses, mostly Odonata, Decapoda (crabs) and Hydrobiosidae, comprised 2.8% of the fauna and grazer-scrapers made up 7.4%. The latter were inhibited by low instream production owing to heavy shading and the instability and abrasion of the substrate due to frequent spates. In comparison, the trophic ecology of the nearby, coastal, Bovo River (with a catchment mainly in rainforest but mostly cleared with introduced species at the study site) was quite different and it was dominated by collector-gatherers (74%) and grazer-scrapers (15%).
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Pavicevic, Ana, i V. Pesic. "Water beetle distribution along a perennial distance gradient in an intermittent stream from the Mediterranean part of Montenegro". Archives of Biological Sciences 64, nr 1 (2012): 345–51. http://dx.doi.org/10.2298/abs1201345p.
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In this study, we examined the impact of an unstable hydrological regime (floods and seasonal drying) on water beetle fauna after a drought period, in an intermittent stream in the Mediterranean part of Montenegro. Aquatic beetles were collected between November 2009 and May 2010 from three intermittent sites along the Rimanic stream at different distances from the perennial part (DP), using quantitative sampling methods. We predicted that water beetle assemblages would vary in structure and composition along DP gradients. Total abundance, taxa richness, main faunal groups and proportion of adults and larvae were assessed in order to describe the changes in the water beetle assemblages. The water beetle fauna in the studied sites recovered slowly from the drought periods in terms of both total abundance and taxa richness. Analysis of similarity (ANOSIM) showed no significant changes in community structure between the sites, but revealed changes in terms of date (Rho = 0.403).
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Kleine, Priscila, Susana Trivinho-Strixino i Juliano José Corbi. "Relationship between banana plant cultivation and stream macroinvertebrate communities". Acta Limnologica Brasiliensia 23, nr 4 (8.05.2012): 344–52. http://dx.doi.org/10.1590/s2179-975x2012005000012.
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AIMS: The present study describes the influence of banana plant cultivation on macroinvertebrate communities of streams located in the southeastern region of São Paulo state in the Atlantic Forest (four located in areas of banana cultivation and four in preserved areas); METHODS: Sampling was performed during October and November of 2005. The fauna was collected with Surber sampler and a D-aquatic net (both with mesh of 0.25 mm) in rapids and backwaters. Simultaneously, an environmental characterization of each stream was made; RESULTS: In total, 3,609 individuals were collected, distributed in 57 families, in which 45 were in forested streams and 46 in the banana plantation sites. Gripopterygidae, Perlidae, Leptophlebiidae, Leptoceridae, Helicopsychidae and Palaemonidae were abundant in forested streams, while Hydropsychidae, Chironomidae and Baetidae were abundant in the streams located in banana cultivation areas. Cluster analysis (UPGMA) with Simpson similarity measurement applied to the fauna of all streams evidenced the differences between forested and banana plantation streams. An analysis of similarity applied to both situations also pointed to significant differences (p < 0.05) between the two areas; CONCLUSIONS: This agricultural activity, although did not influence species richness patterns, seems to influence the structure of macroinvertebrate communities in low order streams in the Atlantic Forest region.
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İlhan, Ali, Hasan Musa Sarı i Irmak Kurtul. "Fish fauna of Bakırçay Stream (North Eagean, Turkey)". Ege Journal of Fisheries and Aquatic Sciences 37, nr 3 (15.09.2020): 309–12. http://dx.doi.org/10.12714/egejfas.37.3.14.
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This study was carried out to determine the current fish fauna of Bakırçay River in seasonal periods between 2017 and 2018. Sampling was carried out in 15 different locations, 11 lotic and 4 lentic location from the small streams of source of the river to the downstream region. The sampling was performed with “Samus 725 G” model electroshock in lotic habitats; with standard fishing-nets which was “TS EN 14757 Water Quality” in lentic habitats. As a result of the study, the presence of 17 taxa from 7 families including Anguillidae, Atherinidae, Cobitidae, Cyprinidae, Nemacheilidae, Poecilidae and Gobiidae were determined. Mugilidae family members and Salaria pavo species, which were previously reported within the stream, were not obtained in our study. However, the presence of 6 species, namely Atherina boyeri, Cyprinus carpio, Carassius gibelio, Oxynemacheilus teophili, Gambusia holbrooki and Knipowitschia caucasica species were found in this study for the first time. Cyprinidae family with 11 taxa was the biggest family in terms of species diversity in the river basin. Anguillidae, Atherinidae, Cobitidae, Nemacheilidae, Poecilidae and Gobiidae families are represented by one taxon. In order to protect the river's biodiversity and to maintain fishing activities effectively, the pollution sources should be overcomed firstly. In order to protect the biodiversity of the river and to maintain fishing activities effectively, first of all, pollution sources and exotic fish species that may have negative effects on the natural fish fauna of the basin should be bring under control. In addition, it will also be useful to organize events to inform local governments and community about the importance and protection of aquatic environments.
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Langer, Seema, A. Sharma i S. Parvez. "Macrobenthic Fauna of a Local Stream, Ghomanhasan (Jammu)". Current World Environment 1, nr 1 (25.06.2006): 159–63. http://dx.doi.org/10.12944/cwe.6.1.23.
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Kanayama, A., i K. Saito. "Seasonal change of Simuliidae fauna in a stream". Medical Entomology and Zoology 49, nr 2 (1998): 147. http://dx.doi.org/10.7601/mez.49.147_2.
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Yule, CM. "Benthic invertebrate fauna of an aseasonal tropical mountain stream on Bougainville Island, Papua New Guinea". Marine and Freshwater Research 46, nr 2 (1995): 507. http://dx.doi.org/10.1071/mf9950507.
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The benthic invertebrate fauna of Konaiano Creek, a small aseasonal mountain rainforest stream on Bougainville Island, Papua New Guinea, was studied over a period of 22 months. Konaiano Creek supported a diverse, mostly undescribed, fauna dominated by two closely related species of Simuliidae (55% of the total specimens collected) and two species of Hydropsychidae. Over 182 taxa were recorded, more than half of which were Diptera. Species richness in Konaiano Creek was quite high in comparison with that of similar streams in both tropical and temperate regions. There were 31 species of Trichoptera, but there were no Plecoptera, Mollusca, Psephenidae, or Megaloptera. Although many groups of marine origin such as Gastropoda, Atyidae, Palaemonidae and fish inhabited nearby coastal rivers, these animals were apparently unable to colonize high mountain streams because of the torrential, barren nature of the mid-mountain streams that sharply divide the headwater streams from the lowland rivers on Bougainville Island.
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C. Chessman, Bruce, i Simon A. Williams. "Biodiversity and conservation of river macroinvertebrates on an expanding urban fringe: western Sydney, New South Wales, Australia". Pacific Conservation Biology 5, nr 1 (1999): 36. http://dx.doi.org/10.1071/pc990036.
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As in many growing urban areas, the prevention of environmental damage as Sydney spreads westward into the Hawkesbury-Nepean River basin is a major challenge for planners, managers and the local community, We surveyed macroinvertebrates at 45 river and stream sites in April-June 1996, and reviewed data from other sources, in order to assess the issues involved in conservation of the lotic macro invertebrate fauna, Regional richness is high with 443 recorded species and morphospecies, Cluster analysis showed community pattems related mainly to waterway size (separating the Hawkesbury-Nepean River from tributary streams), geology (tributaries on shale or sandstone), tidal intrusion and urbanization (impoverished faunas in urban streams). The ability of genus richness of mites and major insect orders to reflect overall genus richness at a site was limited, and Diptera and Trichoptera appear to have the greatest value as biodiversity predictors. Urban expansion is the major threat to lotic macro invertebrate communities in the region, but agriculture, flow regulation, sand and gravel ex1raction and introduced species have probably also impacted on the fauna, Streams with high conservation value for macroinvertebrates include those few on the Cumberland Plain and surrounding slopes that retain substantial indigenous vegetation in relatively undeveloped catchments. The Hawkesbury-Nepean River sfill harbours a rich faunal community and is also important for conservation, The development of effective strategies for conservation assessment and management is problematic for several reasons, Some species in the region are known to be vulnerable, but the status of most cannot be assessed because of a lack of taxonomic and zoogeographic information, Most "biodiversity indicator" concepts are of dubious value for aquatic macroinvertebrate conservation. A multi-faceted management approach emphasizing subcatchment reserves, riparian restoration and the control of threatening processes is required.
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Maneechan, Witwisitpong, i Taeng On Prommi. "Diversity and Distribution of Aquatic Insects in Streams of the Mae Klong Watershed, Western Thailand". Psyche: A Journal of Entomology 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/912451.
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The distribution and diversity of aquatic insects and water quality variables were studied among three streams of the Mae Klong Watershed. In each stream, two sites were sampled. Aquatic insects and water quality variables were randomly sampled seven times in February, May, September, and December 2010 and in January, April, and May 2011. Overall, 11,153 individuals belonging to 64 families and nine orders were examined. Among the aquatic insects collected from the three streams, the order Trichoptera was most diverse in number of individuals, followed by Ephemeroptera, Hemiptera, Odonata, Coleoptera, Diptera, Plecoptera, Megaloptera, and Lepidoptera. The highest Shannon index of diversity of 2.934 and 3.2 was recorded in Huai Kayeng stream and the lowest was in Huai Pakkok stream (2.68 and 2.62). The high diversity of insect fauna in streams is an indication of larger microhabitat diversity and better water quality conditions prevailing in the streams. The evenness value was recorded as high in most sites. The high species diversity and evenness in almost all sites indicated good water quality.
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Growns, IO, i JA Davis. "Effects of forestry activities (clearfelling) on stream macroinvertebrate fauna in south-western Australia". Marine and Freshwater Research 45, nr 6 (1994): 963. http://dx.doi.org/10.1071/mf9940963.
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The effects of forestry activities on macroinvertebrate community structure were examined in the headwaters of Carey Brook in the south-west of Australia. The fauna at four sites on an upland stream that ran through a logging coupe were compared, before and after clearfelling, with the fauna at four nearby undisturbed sites. Mean species richness and mean total abundance declined at the treatment sites relative to the control sites after the commencement of clearfelling activities. The composition of the macroinvertebrate fauna in the disturbed stream changed in comparison with that in the undisturbed sites after logging started but returned to the pre-logging composition after winter and spring rains had stopped. The observed changes in the macroinvertebrate fauna occurred during the periods of high loads of suspended inorganic solids at the treatment sites. The possible reasons for the observed results are discussed.
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Harper, D. A. T., P. Alsen, E. F. Owen i M. R. Sandy. "Early Cretaceous brachiopods from North-East Greenland: Biofacies and biogeography". Bulletin of the Geological Society of Denmark 52 (31.12.2005): 213–25. http://dx.doi.org/10.37570/bgsd-2005-52-16.
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Augmentation and revision of the relatively diverse Valanginian brachiopod faunas from North- East Greenland confirm the existence of two mutually exclusive but broadly coeval assemblages, associated with two contrasting facies types. A Boreal, relatively shallow-water assemblage dominated by large terebratulids and ribbed rhynchonellids, including Cyrtothyris, Lamellaerhynchia and Praelongithyris characterizes the Falskebugt fauna. By contrast the Albrechts Bugt and Rødryggen fauna contains Tethyan elements, more typical of deeper water, including Lacunosella, Placothyris, Pygope and Rugitela. This early Cretaceous Out-of-Tethys migration confirms the early and persistent northward track of a proto Gulf Stream current. A new taxon, Placothyris kegeli, is described from the Albrechts Bugt and Rødryggen members of the Palnatokes Bjerg Formation.
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Hortle, KG, i RG Person. "Fauna of the Annan River System, far North Queensland, with reference to the Impact of Tin Mining. I. Fishes". Marine and Freshwater Research 41, nr 6 (1990): 677. http://dx.doi.org/10.1071/mf9900677.
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Fish were sampled at a range of sites in the Annan River system in tropical northern Queensland, using a variety of methods. In all, 25 species were recorded, including 14 principal freshwater forms. Species richness increased in a downstream direction and was directly related to stream size, the best measures of which were catchment area and stream length. When adjusted for stream size, the fish fauna of the Annan River system is relatively rich, compared with temperate Australian systems and streams on other continents. Analyses of gut contents of the species found in fresh water showed that six species were carnivorous, four were omnivorous, three were algivorous or detritivorous, and one was piscivorous. Mining impacts were evident at three sites and were associated with a reduced number of species; those eliminated were apparently less tolerant of sediment.
30
Degerman, E., i B. Sers. "The effect of lakes on the stream fish fauna". Ecology of Freshwater Fish 3, nr 3 (wrzesień 1994): 116–22. http://dx.doi.org/10.1111/j.1600-0633.1994.tb00113.x.
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TURCOTTE, P., i P. P. HARPER. "The macro-invertebrate fauna of a small Andean stream". Freshwater Biology 12, nr 5 (29.05.2006): 411–19. http://dx.doi.org/10.1111/j.1365-2427.1982.tb00635.x.
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Milesi, Silvia Vendruscolo, i Adriano Sanches Melo. "Conditional effects of aquatic insects of small tributaries on mainstream assemblages: position within drainage network matters". Canadian Journal of Fisheries and Aquatic Sciences 71, nr 1 (styczeń 2014): 1–9. http://dx.doi.org/10.1139/cjfas-2013-0092.
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Tributaries may affect fauna in a mainstream by changing bottom substrate and increasing spatial heterogeneity. Additionally, we hypothesized that fauna in the mainstream may be affected by drifting migrants from tributaries. In nine stream networks, we sampled a similar microhabitat immediately upstream and downstream of two confluences. In each network, one confluence was located in the network centre and one in the periphery, and they were distinguished by low and high ratios of tributary size, respectively. We assessed whether the aquatic fauna at sites downstream from confluences was species-richer, distinct in composition and structure, and whether it included the fauna of upstream sites. We found that richness, rarefied richness, and abundance at downstream sites were not higher than at their upstream counterparts. Faunas at downstream sites were not nested subsets of those at upstream sites. Macroinvertebrate assemblage composition and structure differed between downstream and upstream sites in the peripheral confluences (high tributary to mainstream (T:M) ratios), but not in central confluences (low T:M ratios). Thus, effects of small tributaries on receiving mainstreams are dependent on the T:M ratio.
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Kasahara, Tamao, i Alan R. Hill. "Effects of rifflestep restoration on hyporheic zone chemistry in N-rich lowland streams". Canadian Journal of Fisheries and Aquatic Sciences 63, nr 1 (1.01.2006): 120–33. http://dx.doi.org/10.1139/f05-199.
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Stream restoration projects that aim to rehabilitate ecosystem health have not considered surfacesubsurface linkages, although stream water and groundwater interaction has an important role in sustaining stream ecosystem functions. The present study examined the effect of constructed riffles and a step on hyporheic exchange flow and chemistry in restored reaches of several N-rich agricultural and urban streams in southern Ontario. Hydrometric data collected from a network of piezometers and conservative tracer releases indicated that the constructed riffles and steps were effective in inducing hyporheic exchange. However, despite the use of cobbles and boulders in the riffle construction, high stream dissolved oxygen (DO) concentrations were depleted rapidly with depth into the hyporheic zones. Differences between observed and predicted nitrate concentrations based on conservative ion concentration patterns indicated that these hyporheic zones were also nitrate sinks. Zones of low hydraulic conductivity and the occurrence of interstitial fines in the restored cobble-boulder layers suggest that siltation and clogging of the streambed may reduce the downwelling of oxygen- and nitrate-rich stream water. Increases in streambed DO levels and enhancement of habitat for hyporheic fauna that result from rifflestep construction projects may only be temporary in streams that receive increased sediment and nutrient inputs from urban areas and croplands.
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da Silva Pinto, Thandy Junio, i Welber Senteio Smith. "Impacts of sedimentation and dam failure on the macroinvertebrate community in a tropical stream". Limnetica 42, nr 1 (styczeń 2023): 1. http://dx.doi.org/10.23818/limn.42.03.
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Changes in land use due to human activities lead to disturbances related to sedimentation in aquatic ecosystems. Furthermore, the construction of dams in streams raises concerns about their safety, and the rupture of these structures implies significant impacts. Thus, this article assessed the effects of sedimentation and dam failure on the aquatic macroinvertebrate community in a tropical stream and verified its influence on the structural and functional composition of this assemblage of organisms. Water physical-chemical parameters and macroinvertebrate fauna data were obtained from monitoring data for both the pre- and post-rupture period. Macroinvertebrates were identified at the family level and classified according to functional feeding groups. Structural and functional biological indexes were applied, and data were analyzed using comparison tests, correla¬tion matrix, correspondence, and cluster analysis. The results showed that sedimentation resulted in the impoverishment of macroinvertebrate fauna, with the loss of important functional feeding groups, indicating a low environmental quality. Dam failure changed the composition of the fauna, leading to the disappearance of important orders, the appearance of organisms belonging to the order Coleoptera, and the loss of feeding groups with consequent loss of ecological functions. The dam failure was not the only stressor for the studied stream, because it already suffered from small and medium scale disturbances related to sedimentation. However, the rupture of the structure resulted in greater environmental losses, and is considered large scale, implying the need to implement recovery measures in the area.
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Casatti, Lilian, María Angélica Pérez-Mayorga, Fernando Rogério Carvalho, Gabriel Lourenço Brejão i Igor David Da Costa. "The stream fish fauna from the rio Machado basin, Rondônia State, Brazil". Check List 9, nr 6 (1.11.2013): 1496. http://dx.doi.org/10.15560/9.6.1496.
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The rio Machado (also known as Ji-Paraná) is a tributary of the rio Madeira in the Amazon basin. Currently, the rio Madeira contains the greatest fish species richness of the world, with approximately 1,000 species. The present study presents the fish inventory from streams of the rio Machado basin. In total, 75 stream reaches, 80 meter-length, randomly selected, were sampled in 2011 (August to October) and 2012 (June to July). Overall, 22,875 fish in eight orders, 32 families, 89 genera, and 140 species were collected. Richness estimators indicate that almost 90% of the expected richness was registered. The great majority of specimens (52.2%) was represented by small sized piabas such as Serrapinnus aff. notomelas, Moenkhausia collettii, Serrapinnus microdon, and Hemigrammus melanochrous. Of the total richness, 25 species were restricted to 9°00’ S and 10°00’ S; among them, 14 were exclusive to the lower portion of the basin, which exhibits the larger proportion of native vegetation covering.
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Dostine, P. L., C. L. Humphrey, R. M. Paltridge i A. J. Boulton. "Macroinvertebrate recolonization after re-wetting of a tropical seasonally-flowing stream (Magela Creek, Northern Territory, Australia)". Marine and Freshwater Research 48, nr 7 (1997): 633. http://dx.doi.org/10.1071/mf97059.
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Magela Creek, a tropical stream in northern Australia, dries out for most of its length for approximately 6 months of the year. At the end of the dry season, the macroinvertebrate fauna of the perennial upper reaches and lowland billabongs were sampled, as well as resting stages of the fauna in the dry sandy streambed. With the resumption of wet-season flow, drift and benthos were sampled from three sites along the sand tract of the creek over the ensuing four weeks. Recolonization commenced rapidly after first flow. Most taxa were derived from the perennial upper reaches through drift, but contributions from an adjacent billabong and resting stages in the substratum were important in the early stages of species establishment at the most downstream site. The dry sandy sediments were also a significant refuge for microcrustaceans. On the basis of this work and a review of other research, it is concluded that the significance of dry-season refuges to recolonization of temporary streams when flow resumes is governed by the nature of the substratum, the severity of the dry season and the proximity of the stream to permanent waters.
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Reice, Seth R., i Robert L. Edwards. "The effect of vertebrate predation on lotic macroinvertebrate communities in Québec, Canada". Canadian Journal of Zoology 64, nr 9 (1.09.1986): 1930–36. http://dx.doi.org/10.1139/z86-290.
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To test the role of vertebrate predation on benthic community structure, experiments were performed in two third-order streams in northern Québec, Canada. Predators were either enclosed in or excluded from replicate benthic cages (20 × 30 × 10 cm). Ruisseau du Cran Carré (RCC) has a normal complement of fish, while Low Hope Creek (LHC) is fishless. In June 1983, two species of fish were manipulated (one fish per cage, five replicate cages per treatment) in RCC, while the salamander Eurycea bislineata was manipulated in LHC. In August 1983, brook trout fry were manipulated in both streams. It was anticipated that the fauna in LHC, having had no previous contact with fish, would be more susceptible to fish predation than the fauna of RCC. Gut analysis revealed that fish did feed in the cages. However, neither fish predation nor salamander predation had significant effects on prey communities in either stream in June. Community parameters (species richness and diversity, and total numbers of individuals) were not influenced by the presence or absence of fish or salamanders. In August, three-quarters of the taxa were more abundant without trout than with trout. However, few individual taxa were significantly affected by the fish. This effect was similar in both streams. By enclosing fish in a fishless stream, this experiment was designed to enhance the possible effects offish predation on the lotic macrobenthic community. This work strengthens the idea that brook trout are not major structuring agents of the macrobenthic communities of small streams.
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Robson, Belinda J. "Role of residual biofilm in the recolonization of rocky intermittent streams by benthic algae". Marine and Freshwater Research 51, nr 7 (2000): 725. http://dx.doi.org/10.1071/mf00012.
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Human use of stream flow for water supply may increase the duration and/or frequency of dry periods in intermittent streams, but there is little information on the effect of this change on in-stream flora or fauna. To predict the effects of dry periods on stream biota, it is necessary to understand the relative roles of various sources of recolonization. A transplant experiment was used to test the hypothesis that the dry residual algal biofilm on stones in intermittent streams is an important source of algal growth when the streams are re-wetted. Two sites were chosen, one on each of two intermittent streams in south-eastern Australia. Rocks at the sites differed in the amount of naturally occurring residual biofilm on them. Forty rocks were transplanted between the sites and counts of algal densities were made from samples taken one and five weeks after flow recommenced. At one of the sites, where the biofilm was dominated by Cyanobacteria, dry residual biofilm strongly influenced the developing algal community at both one and five weeks after flow recommenced. At the other site the influence of dry biofilm was limited after five weeks, implying that other sources of algal recolonization were influential there.
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Rosa, BFJV, RT Martins i RG Alves. "Distribution of oligochaetes in a stream in the Atlantic Forest in southeastern Brazil". Brazilian Journal of Biology 75, nr 1 (marzec 2015): 1–7. http://dx.doi.org/10.1590/1519-6984.02313.
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The oligochaetes are considered good indicators of ecological conditions and specific types of habitats. Among the factors that influence the distribution of these invertebrates are the water flow and the nature of the substrate. The aim of this study is to describe the composition and distribution of oligochaete species in a first-order stream in Atlantic Forest and try to identify if some species are associated with characteristics of particular types of habitats. In the dry season and in the rainy season, sand and litter samples in two riffle areas and two pool areas were collected in different parts along the stream using a hand net. The greatest observed richness and abundance occurred in sand in the pool, however the greatest estimated richness was obtained for litter in the pool. The Kruskal-Wallis analysis showed effect of the different types of habitat on the abundance and richness of oligochaetes. The Nonmetric Multidimensional Scaling (NMDS) and Multiresponse Permutation Procedure analysis (MRPP) indicated that the variation in the fauna composition had relation with different types of substrates. The indicator species analysis showed that Limnodrilus. hoffmeisteri was an indicator species in both the riffle sand and pool sand and Pristina americana was only an indicator in the pool sand. The high organic matter content in both sandy habitats probably favored the greater abundance of oligochaetes. The results showed that the substrate constitutes an important factor for the local distribution of these invertebrates in streams. The variation of the community structure among mesohabitats and the presence of indicator species of specific types of habitats in the stream demonstrate the importance of environmental heterogeneity for the oligochaetes fauna in forested streams.
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Singh, Yogendra, Ashish K. Chowdhary i S. N. Bahuguna. "Ichthyofaunal diversity in Bachan Gad and Kakda streams of the Mid-himalayan Ganga river system of Garhwal in relation to stream gradient and distance". Journal of Applied and Natural Science 6, nr 1 (1.06.2014): 298–303. http://dx.doi.org/10.31018/jans.v6i1.419.
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The present study was carried out to investigate the comparative seasonal distribution and relative abundance of fish fauna of streams Bachan Gad of river Alaknanda and Kakda Gad of river Mandakini of Mid-himalayan Ganga river System. Total length of the Bachan Gad is 14.5 km from origin to the confluence at main river Alaknanda with an altitudinal variation from 605.94 to 1418.23m (a.s.1), whereas, total length of the Kakda Gad is 15.5 km. from origin to confluence at main river Mandakini with altitudinal variation from 984.50 to 1993.70 m (a.s.1). Total 23 species from Bachan Gad and 20 fish species were identified from Kakda Gad. The differences in the availability of fish-fauna were directly related to the nature of the profile and slope of tributaries; which affects the migration and breeding grounds of the fishes inhabited in the main river Alaknanda and Mandakini of Ganga river system. Variation in the availability of fishes has been recorded from different sites of the stream. In streams and rivers the changes take place along their length is directly related to the eco-physico-chemical nature (water depth, current, substratum etc). All these factors which change along the length of streams are also the factors which control the distribution of the various sections of the biotic fauna and flora.
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Clarke, Amber, P. S. Lake i Dennis J. O'Dowd. "Ecological impacts on aquatic macroinvertebrates following upland stream invasion by a ponded pasture grass (Glyceria maxima) in southern Australia". Marine and Freshwater Research 55, nr 7 (2004): 709. http://dx.doi.org/10.1071/mf04043.
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Glyceria maxima (Reed sweet-grass), an emergent aquatic grass native to Eurasia, has naturalised in North America, New Zealand and southern Australia. Introduced as a ponded pasture species, it threatens native biodiversity and ecosystem processes in freshwater wetlands and waterways. We compared paired sections, either invaded or not invaded by G. maxima, of three upland streams in Gippsland, Victoria, Australia to infer its impacts on macroinvertebrate abundance, morphospecies density, and morphospecies and functional feeding group (FFG) composition. Its potential effects in altering sedimentation were explored by comparing stream channel morphology in paired stream sections at one site. Invasion by G. maxima appears to drive changes in macroinvertebrate morphospecies composition and FFG composition, reducing a diverse array of macroinvertebrates to a more uniform fauna. The estimated volume of plant/sediment matrix in a 50 m invaded stream section was around 1100 m3, nearly 15-fold greater than in an adjacent uninvaded stream section. Glyceria maxima is an autogenic ecosystem engineer, with the ability to convert sections of fast-flowing aerobic streams into partially anaerobic swamps. By generating a root-mat swamp with a high capacity to process nutrients, G. maxima may facilitate its own growth and spread, as well as that of secondary invaders.
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Yanai, Zohar. "The Stoneflies (Insecta: Plecoptera) of Israel: Past, Present, Future…?" Diversity 14, nr 2 (24.01.2022): 80. http://dx.doi.org/10.3390/d14020080.
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Of the more than 3900 described species worldwide, stoneflies (order Plecoptera) are represented in Israel, a semi-arid country, by as few as five species. As a group of highly sensitive aquatic insects, they are restricted to the northernmost watershed of the Sea of Galilee, where the most pristine streams in Israel are found. The Israeli stoneflies are not often collected in the field, and they have not been recorded in the literature in the last 30 years. In order to provide an up-to-date picture, I gathered the available historical records of the local fauna, as well as all verified data from the last decade, and compared the two datasets. Despite the unprecedented efforts that have recently been invested in studying freshwater macroinvertebrates in Israel, a sharp decrease in stonefly occurrence is evident. Whilst the populations of three species have dramatically declined (Protonemura zernyi, Leuctra hippopus, and L. kopetdaghi), the remaining two have not been collected at all in over four decades and are considered locally extinct (Brachyptera galeata and Marthamea beraudi). These findings highlight the joint impact of multiple stressors on the stream system in the Sea of Galilee Watershed—namely, stream pollution and water diversion on the local level and climate change on the global level. If the current trends continue, there is a great concern that the entire local stonefly fauna will become extinct, and many stream-dwelling taxa may follow soon after.
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Karlsen, Claudia S., Mogens R. Flindt, Melanie J. Sønderup, Martin H. Madsen i Sara Egemose. "Impact of Land Use and Runoff on Stream Quality". Sustainability 11, nr 19 (3.10.2019): 5479. http://dx.doi.org/10.3390/su11195479.
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Climate changes, intensive agricultural production, and expanding urban areas make the study of runoff and its possible impact on stream quality increasingly important. In this study, we examined large datasets concerning catchment type, stream quality, and invertebrate composition in a comprehensive geographic information system study. The aim was to examine correlations between land use type and quality of the receiving waters to detect possible differences in anthropogenic impacts. The studied area covered 937 km2, and the dataset included 1672 stretches of streams and data from 468 fauna sampling stations. Runoff from agricultural areas more negatively influenced the stream quality than runoff from urban areas. Considering urban catchments, the areas with separate sewer systems generally influenced the stream quality less than catchments with combined sewer systems. In conclusion, the catchment of any specific stream must contain an area with a minimum of 20–30% without agriculture or urban areas to obtain good ecological status; when focusing only on the riparian zone (10 m on each side of the stream), a minimum of 40–55% is needed to create a good ecological status. Therefore, management focus on the entire catchment is important and separate sewers should be preferred rather than combined sewers.
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Edwards, R. W., i R. C. Muirhead-Thomson. "Pesticide Impact on Stream Fauna with Special Reference to Macroinvertebrates." Journal of Applied Ecology 25, nr 2 (sierpień 1988): 752. http://dx.doi.org/10.2307/2403868.
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Elliott, J. M., i R. C. Muirhead-Thomson. "Pesticide Impact on Stream Fauna with Special Reference to Macroinvertebrates". Journal of Animal Ecology 57, nr 3 (październik 1988): 1070. http://dx.doi.org/10.2307/5116.
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Jung, Hwa-Young, Kyeong-Hwan Kim, Mi-Young Song i Wan-Ok Lee. "Characteristics of Fish Fauna and Community Structure in Ungcheon Stream". Korean Journal of Environment and Ecology 28, nr 3 (30.06.2014): 314–25. http://dx.doi.org/10.13047/kjee.2014.28.3.314.
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Schmera, D., i T. Eros. "Estimating sample representativeness in a survey of stream caddisfly fauna". Annales de Limnologie - International Journal of Limnology 42, nr 3 (wrzesień 2006): 181–87. http://dx.doi.org/10.1051/limn/2006019.
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Schütz, Stefan Andreas, John E. Brittain i Leopold Füreder. "Diverging life cycle patterns of two Diamesa species (Diptera, Chironomidae) in High Arctic streams, Svalbard". Polar Biology 45, nr 2 (21.12.2021): 285–96. http://dx.doi.org/10.1007/s00300-021-02987-1.
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AbstractThe fauna of streams in the High Arctic, dominated by chironomids, is shaped by extreme environmental conditions that represent the physiological limits for benthic invertebrates. Despite their ecological importance, little is known of chironomid life histories, development strategies and the key abiotic drivers limiting larval growth in High Arctic streams. We investigated the larval development and growth in three High Arctic rivers with contrasting water sources, thermal regimes and nutrient characteristics. Populations of the larvae of Diamesa bohemani (Goetghebuer 1932) and Diamesa aberrata (Lundbeck 1898) from two sampling occasions in July and August 2016 were morphometrically analysed to determine life history patterns and instream productivity. Water temperature differences lead to diverging development patterns on local spatial scales. The lowest larval growth was in a groundwater/snowmelt fed stream with low food concentration and quality, suggesting that stream productivity is not primarily water source dependant, but is dependent on the nutrient supply. Glacially influenced streams are clearly more productive than previously assumed, resulting in comparable secondary production to groundwater/snowmelt-fed streams.
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Hammer, William R., James W. Collinson i William J. Ryan III. "A new Triassic vertebrate fauna from Antarctica and its depositional setting". Antarctic Science 2, nr 2 (czerwiec 1990): 163–67. http://dx.doi.org/10.1017/s0954102090000219.
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A new fauna of late Early to early Middle Triassic vertebrates has been found in the upper member of the Fremouw Formation in the Beardmore Glacier area of Antarctica. It includes Cynognathus, a kannmeyeriid, and other therapsid (mammal-like) reptiles representing new, more derived genera of carnivorous and gomphodont cynodonts. New genera of temnospondyl amphibians belonging to the capitosauroid evolutionary complex also occur. The unusual abundance of well-preserved amphibians may offer new insights concerning the evolution and distribution patterns of early Mesozoic temnospondyls. These fossils represent only the second terrestrial vertebrate fauna from the mainland of Antarctica. The fossils occur on a prominent sandstone platform, which represents part of the exhumed channel of a braided stream deposit. The platform is over 200 metres above the well-known Lystrosaurus fauna of the lower Fremouw Formation. The locality is near the axis of a major foreland basin that paralleled the present trend of the Transantarctic Mountains. Conditions of rapid subsidence and aggradation of fluvial units were ideal for the preservation of vertebrate faunas.
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Kneževič, Slobodan, i Vladan Radulović. "Important geological localities in the Belgrade area". Geologica Balcanica 26, nr 2 (30.06.1996): 39–44. http://dx.doi.org/10.52321/geolbalc.26.2.39.
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The paper is presenting the most important geological fossil localities in the Belgrade area. Among Mesozoic rocks, it is the Summer Theatre at Topčider, a locality of fossil fauna from Lower and Upper Creataceous deposits. For Neogene sediments, the selection is made of the known fossiliferous rocks localities: Badenian – the Rakovica stream, Kalemegdan and Tašmajdan; Pannonian – the Karagača stream.