Relevant bibliographies by topics / Freshwater streams

Academic literature on the topic 'Freshwater streams'

Author: Grafiati
Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Freshwater streams"

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Mascareñas, Doreen, Roy de Leon, and Efren Delos Reyes. "Watershed and Pahu-anCave Stream Interconnectivity in Bonliw, Torrijos, Marinduque, Philippines." Environments 6, no. 2 (January 24, 2019): 11. http://dx.doi.org/10.3390/environments6020011.

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Marinduque Island is characterized as having a karst landscape with caves having underground streams harboring a variety of freshwater organisms including freshwater shrimps which are dependent on the quality of the forest and watershed. This study aimed to characterize the forest cover overlying the cave, siltation/sedimentation rate in the surface and cave streams, nutrient contents (ammonium, phosphate. and sulfate) of the sediment and water, and freshwater shrimps and phytoplanktons present in both streams. Results of the assessment indicate that the surface stream and the cave stream in the Torrijos Watershed Forest Reserve are interconnected as shown by both streams having similar freshwater shrimps and phytoplankton species. Phytoplanktons to develop will need sunlight which is devoid in the cave, and therefore have to be transported to the caves to be present. The freshwater shrimps found in the cave are not troglobitic and therefore has found its way to the cave stream. Further, there seemed to be a similar trend on the total suspended solids, sedimentation rates and amount of nutrients (phosphates) between the two streams. Although organic matter and nutrients from the aboveground landscape are needed for the sustenance of organisms in the cave ecosystem (the abundance of which are dependent on the connectivity of the two water systems), siltation/sedimentation can ultimately threaten the water quality of cave stream. With the forest in the watershed area characterized as denuded, the threat is evident. The protection of the watersheds and its landscape is imperative.
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Hawes, Ian, and Paul Brazier. "Freshwater stream ecosystems of James Ross Island, Antarctica." Antarctic Science 3, no. 3 (September 1991): 265–71. http://dx.doi.org/10.1017/s0954102091000329.

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The freshwater streams of James Ross Island share many of the features common to other Antarctic streams. There is a diel variation in temperature and discharge, which follows the daily insolation cycle; catchments are barren; stream vegetation is predominantly algal, comprising mat-forming cyanobacteria and filamentous chlorophytes; and physical factors, particularly turbidity and bed stability are important in determining biomass and composition of algal assemblages. Nutrient concentrations vary from stream to stream and over a diel cycle, with minimum dissolved N in late afternoon. Biomass attained and photosynthetic and respiratory rates are also comparable to those recorded in other Antarctic streams, with low productivity/biomass ratios in perennial assemblages.
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Richardson, John. "Biological Diversity in Headwater Streams." Water 11, no. 2 (February 21, 2019): 366. http://dx.doi.org/10.3390/w11020366.

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Headwaters, the sources of all stream networks, provide habitats that are unique from other freshwater environments and are used by a specialised subset of aquatic species. The features of headwaters that provide special habitats include predator-free or competitor-free spaces; specific resources (particularly detrital based); and moderate variations in flows, temperature and discharge. Headwaters provide key habitats for all or some life stages for a large number of species across just about all freshwater phyla and divisions. Some features of headwaters, including isolation and small population sizes, have allowed for the evolutionary radiation of many groups of organisms within and beyond those habitats. As small and easily engineered physical spaces, headwaters are easily degraded by streambank development, ditching and even burial. Headwater streams are among the most sensitive of freshwater ecosystems due to their intimate linkage with their catchments and how easily they are impacted. As a unique ecosystem with many specialist species, headwater streams deserve better stewardship.
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Carr, Jonathan W., and Frederick G. Whoriskey. "The escape of juvenile farmed Atlantic salmon from hatcheries into freshwater streams in New Brunswick, Canada." ICES Journal of Marine Science 63, no. 7 (January 1, 2006): 1263–68. http://dx.doi.org/10.1016/j.icesjms.2006.03.020.

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Abstract The escape of juvenile Atlantic salmon from freshwater hatcheries supplying the salmon farming industry may lead to interactions between wild and farmed fish. The scale of this problem, however, has not been examined in detail. We monitored temporal trends in the abundance of escaped juvenile farmed salmon in the Magaguadavic River and Chamcook Stream for several years. In addition, in 2004 we assessed more than 90% of the commercial hatcheries producing salmon smolts located next to freshwater streams in New Brunswick. Escaped juvenile fish were recorded in 75% of the streams electrofished close to hatcheries. Numbers varied by site and year. However, escaped juvenile salmon were found every year at sites near hatcheries in the Magaguadavic River and Chamcook Stream. In the Magaguadavic River, juvenile escapees outnumbered wild salmon parr in most years. These results highlight the need for implementation of a containment strategy for freshwater hatcheries to reduce escapes.
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Bareen, Firdaus-e., and S. H. Iqbal. "The autumn communities of freshwater hyphomycetes in the tributaries of the River Neelum." Canadian Journal of Botany 75, no. 7 (July 1, 1997): 1046–60. http://dx.doi.org/10.1139/b97-116.

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Freshwater hyphomycete communities of autumn, based on data generated by three techniques used simultaneously, were richer than those detected by these techniques used singly. The fungal communities in the acidic streams were poorer (28–32 species) than in the circumneutral streams (39–64 species). No significant correlation was found between number of fungal species and pH of the stream water. Combining the data from this study with those of studies by other authors using the same techniques, linear correlation and regression analyses revealed the significant negative correlation between species composition of communities in a stream and its pH. The number of fungal species in assemblages detected by different techniques used singly (e.g., filtration of stream water or examination of foam concentrate) or communities based on data generated by these techniques used simultaneously versus pH values formed a unimodal curve with a maximum at a pH between 6 and 7, mostly at 6.7. The conidial dynamics were influenced by the riparian vegetation. Conidium production from submerged deciduous and conifer litter was determined under laboratory conditions. Generally conidium production per disc was higher for Anguillospora longissima (Sacc. & Syd) Ingold, Flagellospora cumula Ingold, Lunulospora curvula Ingold, and Tetracladium marchalianum de Wildeman in deciduous leaves than conifer leaves. Heliscus lugdunensis Sacc. & Therry, Alatospora acuminata Ingold, and Articulospora tetracladia Ingold produced more conidia per disc in conifer than in deciduous leaves. Percentage similarity between spora produced by submerged substrate and stream spora was higher for deciduous substratum than for coniferous substratum in five circumneutral streams with a riparian vegetation dominated by deciduous trees. This index was higher for coniferous substratum in three acidic streams in which coniferous and deciduous trees were evenly distributed. The fungal communities in the Nosehri, Pathika, and Jabbar Camp streams showed higher values of species diversity than in other streams. Key words: freshwater, hyphomycetes, species diversity.
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Tsang, Ling Ming, Kwok Ho Tsoi, Simon Kin-Fung Chan, Tony King-Tung Chan, and Ka Hou Chu. "Strong genetic differentiation among populations of the freshwater shrimp Caridina cantonensis in Hong Kong: implications for conservation of freshwater fauna in urban areas." Marine and Freshwater Research 68, no. 1 (2017): 187. http://dx.doi.org/10.1071/mf15377.

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Freshwater organisms generally exhibit strong genetic structuring. Although understanding the level and spatial distribution of genetic diversity is crucial for conservation management planning, such information has received little attention until recently in highly developed cities where local extinction attributed to habitat destruction and urbanisation is intense. We compared the genetic divergence in mitochondrial COI of the freshwater shrimp Caridina cantonensis collected from 32 sites in Hong Kong, to determine the connectivity among populations and the levels of genetic diversity of the shrimp. We found that shrimp from different streams are genetically highly differentiated and each stream always has its own unique haplotype groups, even though some of the streams are separated only by a few kilometres, indicating very limited gene flow across streams. Moreover, genetic diversity within each stream is very low, usually with a single haplotype dominating the entire population, and genetic differentiation was observed among tributaries from the same drainage. The high genetic diversity of these species over short distances has significant conservation implications because a substantial amount of biodiversity may have already been lost as a result of past development. Careful conservation planning is essential for future development in Hong Kong and other cities.
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Rutherford, I. D., and C. Gippel. "Australia versus the World: do we face special opportunities and challenges in restoring Australian streams?" Water Science and Technology 43, no. 9 (May 1, 2001): 165–74. http://dx.doi.org/10.2166/wst.2001.0531.

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Australians do face special opportunities and challenges in attempting to restore or rehabilitate their streams, when compared with Western Europe and North America. Some of these differences arise from the physical and ecological character of our streams, particularly in terms of flow variability, stream power, sediment, vegetation interactions, and nutrient levels. We also have modest resources available per-unit-length of stream, and no massive freshwater fishing industry. These, and many other differences, combine to produce an environment in which it can be slower and more difficult to rehabilitate streams, and we have less confidence in the results. International case studies are tremendously useful but in some cases we need to be circumspect in applying the results directly to Australian streams.
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Wright, I. A., P. J. Davies, S. J. Findlay, and O. J. Jonasson. "A new type of water pollution: concrete drainage infrastructure and geochemical contamination of urban waters." Marine and Freshwater Research 62, no. 12 (2011): 1355. http://dx.doi.org/10.1071/mf10296.

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Stormwater and other urban runoff is often conveyed by concrete infrastructure and it is plausible that the chemistry of urban streams is modified by the leaching of minerals from this infrastructure. We tested this hypothesis by analysing major anions, cations and other chemical variables from urban and reference freshwater streams in northern Sydney. Urban streams tended towards neutral pH whereas non-urban reference streams were acidic. Bicarbonate levels were more than 10 times higher and calcium concentrations were more than six times higher in urban streams than reference streams. Experimental analysis revealed that the chemistry of rainwater changed when passed through concrete pipes and down concrete gutters, suggesting dissolution of cement products from various concrete materials used for urban drainage. This study concluded that the use of concrete – particularly its application for urban drainage – is responsible for some of the modifications to urban stream geochemistry. Thus, urban geology should be considered as an important factor that contributes to the urban stream syndrome.
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Diamond, Kelly M., Christopher J. Good, Nina Johnny, Troy S. Sakihara, Paul L. Edmiston, Jennifer A. Faust, Tonya C. Schoenfuss, Alexander M. Rubin, Richard W. Blob, and Heiko L. Schoenfuss. "Assessing Occurrence and Biological Consequences of Contaminants of Emerging Concern on Oceanic Islands." Water 14, no. 3 (January 18, 2022): 275. http://dx.doi.org/10.3390/w14030275.

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Freshwater streams on oceanic islands serve critical ecological and economic functions. However, these are underrepresented in assessments of pollution from contaminants of emerging concern (CEC). Furthermore, freshwater streams and their endemic fauna often have characteristics that are distinct from those of continental streams and model species, calling extrapolations from studies of such systems into question for island streams. In the current study, we assessed the presence of CEC across three sampling events and five freshwater streams on the Island of Hawai’i. We also exposed juveniles of the native fish species Sicyopterus stimpsoni to a mixture of commonly co-occurring CEC for 96 h in static renewal experiments, testing for impacts of CEC in two ecologically relevant assays of functional performance. CEC from multiple sources were ubiquitous in Hawaiian streams, including human-use pharmaceuticals, agricultural herbicides, and industrial runoff. Concentrations of CEC were comparable to published studies from continental streams, exceeding total concentrations of 1000 ng/L for the eight quantified CEC in four samples, and approaching 2500 ng/L in one sample. Effects on exposed fish were subtle and limited to treatments with higher CEC concentrations but indicated potential impacts of CEC on locomotor performance. These results indicate that Hawaiian streams follow a global trend of widespread freshwater pollution by CEC that are accompanied by subtle effects on native fish species and highlight the need for the inclusion of endemic species and ecologically relevant assays when assessing the effects of contaminants in island habitats.
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Jennings, Jean-Jacques, and Avital Gasith. "Spatial and Temporal Changes in Habitat Conditions in the Na'aman Stream Ecosystem, Israel." Water Science and Technology 27, no. 7-8 (April 1, 1993): 387–95. http://dx.doi.org/10.2166/wst.1993.0574.

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Nahal Na'aman is a small, shallow coastal stream in northern Israel. A three year study was conducted to examine the effect of habitat conditions on the biological structure and function of the stream ecosystem. Here we describe temporal and spatial changes in the water regime and water quality as measures of the stream's habitat conditions. Habitat condition is strongly influenced by the hydrological regime and the water quality. In dry years the water level drops and the upper section of the stream may dry up completely. Inflow of polluted water from various sources increasingly reduces water quality downstream. In general, the Na'aman may be categorized as oligo- to mesohaline stream, highly enriched with organic matter and nutrients. Sporadic pollution events markedly affect the water quality resulting in hypertrophic conditions, particularly at times of low stream levels. Low water quality was detected also in association with the drying and refilling of the stream's sections in late summer and in fall, respectively, and following runoff in winter. The oligohaine nature of the stream a priori reduces species diversity relative to other freshwater, lowland streams/Based on water quality conditions, highest species diversity may be expected in the spring area and the upper section of the stream. However, habitat conditions in this section are most unstable due to changes of the hydrological regime. This, in turn, is expected to further reduce species richness and diversity. The extreme conditions are expected to determine the limit for the development of plant and animal life in the stream. This study illustrates the inherent problems of the coastal streams of Israel, namely, diminishing natural flow which is often replaced by discharge of effluent or sewage. Rehabilitation of the Na'aman and other coastal streams demands a radical solution for these problems.
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Dissertations / Theses on the topic "Freshwater streams"

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Chan, King-tung. "Multivariate analysis of benthic macroinvertebrate communities of Hong Kong streams /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18037045.

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She, Shu-sheng. "Determinants of macroinvertebrate community structure on stone surfaces in Hong Kong streams /." [Hong Kong] : University of Hong Kong, 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1373149X.

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She, Shu-sheng, and 佘書生. "Determinants of macroinvertebrate community structure on stone surfaces in Hong Kong streams." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31233879.

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Thursfield, Matthew J. "The effects of acidification on the primary productivity of upland mountain streams." Thesis, Bangor University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261851.

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Lang, Pauline. "Processes driving freshwater plant production and diversity in upland streams." Thesis, University of Glasgow, 2010. http://theses.gla.ac.uk/1864/.

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Upland headwater streams are important sources of freshwater in mountainous temperate to sub-arctic latitude European countries like Scotland. Yet much less is known about the ecology of small, characteristically oligotrophic, mountain streams supporting periphyton and aquatic bryophyte dominated vegetation, and their potential bioindicator capacity of environmental water quality, than lowland rivers impacted by anthropogenic disturbance, in this context. This scarcity of knowledge has significant implications for the success of the recently implemented Water Framework Directive (WFD: 2000/60/EC). The WFD is a major piece of environmental legislation for water policy and sustainable water management in Europe. New contributions are fundamental to environment agencies, such as the Scottish Environment Protection Agency (SEPA), tasked with the responsibility of enforcing WFD statutory requirements and developing effective biomonitoring tools for assessing water quality status in Scotland. A major aim of the WFD is to achieve at least ‘good’ ecological status of inland waterbodies by 2015. Further, in doing so, to ascertain ecological benchmark communities of near-pristine (or minimally-impacted) reference conditions as indicators of high water quality status. The objective is to improve understanding of the environmental processes driving the production and diversity of freshwater plant species-assemblages in upland streams. Such information can be used for assessing perturbations threatening the ecological integrity of rivers impacted by anthropogenic disturbances (human pressure). This enables environment agencies such as SEPA, to respond appropriately by implementing corrective measures and sustainable management strategies. This project monitored a range of near-pristine headwater streams of contrasting underlying geology in the Scottish Highlands. The approach adopted was compatible with current WFD river characterisation and biomonitoring strategies. These were used to investigate the structural and functional response of freshwater plant communities (chiefly diatoms and other algal groups; aquatic bryophyte and vascular submerged macrophyte vegetation) to environmental drivers (e.g. flow, substrate morphology, nutrient inputs, water chemistry, underwater light availability). The work was carried out with the aim of contributing to future development of baseline monitoring tools for assessing upland stream habitat quality in Scotland.
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Cariss, Helen. "Enhancement of invertebrate assemblages in conifer forest streams." Thesis, Manchester Metropolitan University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284877.

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Chan, King-tung, and 陳勁東. "Multivariate analysis of benthic macroinvertebrate communities of HongKong streams." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31213911.

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Pretty, James L. "Detritus retention and invertebrate communities in forestry impacted streams." Thesis, Manchester Metropolitan University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323849.

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Ahmad, Amirrudin Bin. "Biological diversity of freshwater fishes in small streams in peninsular Malaysia." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3144.

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Peninsular Malaysia has a diverse flora and fauna, much of which is yet to be documented. The freshwater fishes are one important group that have received little attention. Accordingly, the overarching goal of my study is to investigate the pattern of species richness and analyse the community composition and assemblage structure of fishes in the small streams in Peninsular Malaysia. Small stream habitats appeared to be particularly important repositories of fish biodiversity in this region thus obtaining a reliable census of species occurring in such habitats is critical for conservation and management of biodiversity. Although samplings were far from completed, these habitats support a great variety of species with more than 100 species were recorded from fifty streams sampled in this study. A few are extremely rare with restricted distribution and can thus be considered important in biodiversity conservation of the Peninsular Malaysian ichthyofauna. Human-influenced modification of lowland, headwater stream habitats in Peninsular Malaysia is common and often exemplified by the creation of pools in stretches of rapids and riffles. However, it was not possible to separate pristine and disturbed sites which contained almost identical for species diversity. These findings suggest that local habitat modification does not necessarily cause a decrease in freshwater fish diversity, with only minor negative consequences for other community variables recorded in this study, and therefore raise interesting issues regarding conservation. That said it remains premature to conclude that small stream fishes are insensitive to disturbance and thus their potential utility as bioindicators of disturbance-influenced community changes remain to be confirmed. The maintenance practises being applied to small streams modified for recreational usage were not imposing detectable negative consequences, at least across the sites sampled in this study. The rich diversity of tropical stream environments is the result of both within-habitat (alpha) diversity and between-habitat (beta) diversity. The results showed that there was substantial beta diversity particularly amongst sites that are geographically separated from one another. On the contrary, the lowest beta diversity values were portrayed by contiguous sites. Many fishes exhibited discontinuous patterns of distribution and were considered to be rare while only a handful were widely distributed and abundant. Ordination based on the relative resemblance of fish communities to one another support the existence of two distinct ichthyogeographic divisions in Peninsular Malaysia. It was possible to assign the species recorded to all seven of Rabinowitz's categories of rarity, with at least 10 restricted to a single stream and locally scarce, although not all of these could be described as hyper-endemic. It is recommended that a sizeable augmentation of the existing protected areas is needed to safeguard Malaysia's exceptionally diverse stream-dwelling fauna of which fishes are simply the most well-known inhabitants. Conservation managers should therefore place particular emphasis on small streams since localities in close proximity to one another can exhibit surprisingly high beta diversity, meaning that partial or small-scale habitat protection may prove insufficient.
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Aldridge, Brenda Michelle Te Aroha. "Restoring giant kokopu (Galaxias argenteus) populations in Hamilton's urban streams." The University of Waikato, 2008. http://hdl.handle.net/10289/2516.

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In this study, options for restoring fish populations in Hamilton City (37.47'S, 175.19'E) were explored. Habitat and fish populations in Hamilton urban streams were manipulated using a two-fold experimental design. Firstly, habitat was enhanced in ten urban streams with three continuous treatments in a 60-m reach at each site (20 m with 10 ponga logs, 20 m with 20 hollow clay pipes, and 20 m with no added structure). Secondly, juvenile farm-reared giant kokopu (Galaxias argenteus), were stocked into five of the enhanced stream sections. Giant kokopu are threatened and occur naturally in Hamilton urban streams in sparse populations. The abundance of wild fish was monitored before and after enhancement and fish release from November 2006 to November 2007. Stocked fish were monitored for eight months, from April to November 2007. Over this time electric fishing was conducted three times, trap nets (Gee minnow and fyke nets) were set monthly and spotlighting was conducted monthly at three release sites where water clarity allowed. Anticipated outcomes of this research were; to determine whether giant kokopu abundance in Hamilton urban streams is limited by recruitment or by habitat, and to assist with the development of methods to restore fish populations in Hamilton City urban streams. Logs used as enhancement structures in Hamilton urban streams provided more stable habitat for fish and created more suitable microhabitat than pipe structures. Pipes moved considerably during high flows, and their instability made them less effective at providing habitat. Within the study sites there appeared to be complex interactions with turbidity, stream width and depth, which complicated the effect of the habitat structures. The limited replication and variability among sites contributed to statistically insignificant results using analysis of variance. Retention and recapture rates of stocked juvenile giant kokopu were greatest at Site M11, where the stream was narrow, shallow, clear and had lower numbers and biomass of shortfin eels, compared to other survey sites. Marked and released giant kokopu were retained in the release reaches at four of the five sites, for a minimum of four months, and exhibited substantial growth. Daily growth of juvenile giant kokopu ranged from 0.19 to 0.33 mm day-1 and from 0.03 to 0.11 g day-1, exhibiting substantial growth over winter. Giant kokopu appeared to have a slight bias to the log section of enhanced habitat, but habitat selection appeared to be overwhelmingly controlled by initial habitat selection. The stocking of farm-reared fish into urban streams was largely successful, but the success of the habitat enhancement was variable and further work is required to determine better techniques for habitat enhancement in these urban environments. It is concluded that releasing farm-reared giant kokopu can be used to restore populations especially where recruitment limitations control fish abundance and diversity.
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Books on the topic "Freshwater streams"

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Fishing rivers & streams. Minnetonka, Minn: Cy DeCosse, 1990.

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Björn, Malmqvist, ed. The biology of streams and rivers. Oxford: Oxford University Press, 1998.

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Rivers, streams, lakes, and ponds. Maple Plain, Minn: Tradition Books, 2004.

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Bentley, John. Streams. London: Batsford, 1985.

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Bahls, Loren L. Periphyton bioassessment methods for Montana streams. Helena, Mont: Water Quality Bureau, Dept. of Health and Environmental Sciences, 1993.

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Mick, Loates, and Male Alan, eds. Ponds and streams. Manchester: World International, 1992.

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Keystone species that live in ponds, streams, and wetlands. Hockessin, Delaware: Mitchell Lane Publishers, 2016.

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Cvancara, Alan M. At the water's edge: Nature study in lakes, streams, and ponds. New York: Wiley, 1989.

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Waters, Thomas F. Sediment in streams: Sources, biological effects, and control. Bethesda, Md: American Fisheries Society, 1995.

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Beatty, Richard. Rivers, lakes, streams, and ponds. Chicago, Ill: Heinemann Library, 2011.

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Book chapters on the topic "Freshwater streams"

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Hodda, Mike, and Walter Traunspurger. "Nematodes from extreme and unusual freshwater habitats." In Ecology of freshwater nematodes, 109–50. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789243635.0004.

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Abstract This chapter discusses the ecology and biogeography of nematodes from freshwater environments that are extreme in temperature, chemical composition, variability, or isolation. Described and compared are the compositions of nematode faunas from hot or mineral springs, pools and bogs in polar regions, intermittent lakes or pools or streams, freshwater pools in bromeliads or tree hollows, stemflow, fresh groundwaters, and caves. Comparisons of the nematode faunas from these extreme habitats with those from more typical freshwater environments are also provided. Also discussed are nematodes with evolutionary affinities to freshwaters that are found in estuarine sediments along with nematodes from freshwaters with evolutionary affinities to otherwise marine taxa. The emphasis is on broad ecological patterns rather than on detailed species interactions with the various freshwater environments. Thus, the chapter focuses on genera or higher taxa rather than species.
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Majdi, Nabil, and Walter Traunspurger. "Production of freshwater nematodes." In Ecology of freshwater nematodes, 247–69. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789243635.0008.

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Abstract This chapter focuses on the methods used to determine freshwater nematode production. It begins by briefly describing the methods used in sampling and measuring nematodes, followed by a summary of the common allometric models developed to estimate secondary production. It then presents a case study in which the results of those models are compared. Finally, it evaluates the drivers of nematode production in different lakes and streams and compares nematode secondary production with that achieved by macrobenthos, other meiobenthic taxa and microbes.
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Traunspurger, Walter, and Nabil Majdi. "Species composition and distribution of free-living nematodes in lakes and streams." In Ecology of freshwater nematodes, 58–108. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789243635.0003.

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Abstract This chapter provides an overview of the distributional patterns of nematodes in lakes, rivers, and streams worldwide and of the factors that affect the structuring of nematode communities in the field. Drivers of variability in species composition such as habitat texture, flow rate, temperature, water chemistry, oxygen, vertical distribution of nematodes in the sediment, water depth in lakes, microphytobenthos, macrophytes, heterotrophic microbes, interspecific competition, and predation, are discussed.
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Oswood, M. W., A. M. Milner, and J. G. Irons. "Climate Change and Alaskan Rivers and Streams." In Global Climate Change and Freshwater Ecosystems, 192–210. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4612-2814-1_9.

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Grimm, Nancy B., and Stuart G. Fisher. "Responses of Arid-Land Streams to Changing Climate." In Global Climate Change and Freshwater Ecosystems, 211–33. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4612-2814-1_10.

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Dahm, Clifford N., and Manuel C. Molles. "Streams in Semiarid Regions as Sensitive Indicators of Global Climate Change." In Global Climate Change and Freshwater Ecosystems, 250–60. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4612-2814-1_12.

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Hawes, Ian. "Filamentous green algae in freshwater streams on Signy Island, Antarctica." In High Latitude Limnology, 1–18. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2603-5_1.

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Choy, Satish C. "Distributional ecology of freshwater fishes in tropical rainforest streams of Borneo." In Monographiae Biologicae, 377–86. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1685-2_38.

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Schlosser, Isaac J. "Critical landscape attributes that influence fish population dynamics in headwater streams." In The Importance of Aquatic-Terrestrial Ecotones for Freshwater Fish, 71–81. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-017-3360-1_7.

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Collares-Pereira, M. J., M. F. Magalhāes, A. M. Geraldes, and M. M. Coelho. "Riparian ecotones and spatial variation of fish assemblages in Portuguese lowland streams." In The Importance of Aquatic-Terrestrial Ecotones for Freshwater Fish, 93–101. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-017-3360-1_9.

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Conference papers on the topic "Freshwater streams"

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Karbassian, Samira, and Mohamad Hassan Panjeshahi. "Simultaneous Energy and Water Minimization: Approach for Systems With Optimum Regeneration of Wastewater." In ASME 2010 Power Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/power2010-27085.

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Water and energy are key commodities utilized in the process industries. In this work, a new systematic design methodology has been developed for the simultaneous management of energy and water systems that also feature optimum regeneration of wastewater. In addition to allowing regeneration of wastewater, issues about heat losses inside unit operations have also been incorporated in the simultaneous management of water and energy. To implement such a design, two new design aspects are introduced; new method for “Non-isothermal Mixing” points identification and new “Separate System” generation. The first aspect involves “non-isothermal mixing”, which enables direct heat recovery between water streams, and therefore allows the reduction of the number of heat transfer units. An NLP model is formulated to identify feasible non-isothermal mixing points in the network regarding minimum operation cost, which satisfy minimum freshwater and utility requirements. The other aspect is the generation of “separate system” in heat exchanger network design. The flexibility of mixing and splitting of water streams allows separate systems to be created as a cost-efficient series of heat exchanger units between freshwater and wastewater streams. The new design aspects have been illustrated with a case study. The results show 60% of total cost saving relevant to the conventional design method.
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Akram, Waqas, and Mostafa H. Sharqawy. "Power Generation With Pressure Retarded Osmosis." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66590.

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Energy can be generated from two streams of different salt concentration using the osmotic pressure difference. Different methods have been proposed to harvest this energy. Pressure retarded osmosis (PRO) is investigated as a viable method and most promising technology. In PRO process, pure water permeates through a semi permeable membrane from the low hydrostatic pressure stream (feed solution) to the higher hydrostatic pressure stream (draw solution) due to the osmotic pressure difference. This increases the volume flow rate of the pressurized draw stream and energy is obtained by depressurizing the draw stream through a hydro turbine. In this study a one-dimensional computational model is developed to precisely estimate the power production under different operating conditions. Different feed and draw solution concentrations are used to estimate the power production from PRO. The maximum power density (power per unit membrane area), using available membrane characteristics, obtained from seawater–freshwater streams is 2.6 W/m2 and for the disposed brine–seawater streams is 9.1 W/m2. The performance of PRO process is very sensitive to the membrane characteristics in particular to the water permeability and PRO module configuration.
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Grubert, Emily A., and Michael E. Webber. "Water, Energy, and Land Use Planning on Maui Island, Hawaii: Estimating Surface Water Supply." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54332.

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Maui Island in the State of Hawaii faces land use and freshwater allocation challenges associated with a growing population and a changing economic base as plantation agriculture has declined. Debate about whether water should be restored to environmental flows, allocated to new urban development for residents and tourists, or be used to irrigate food or fuel crops has highlighted Maui’s opportunity to make integrated resource decisions that consider land, water, and energy in particular. One major potential water demand on Maui is for irrigation for biofuels crops, such as sugarcane for ethanol. While Maui’s energy system is currently low in water intensity, using irrigated biofuels could increase the need for local water investment in energy systems. This paper aims to characterize surface water supply on Maui in order to draw conclusions about supply adequacy for biofuel irrigation. Narrow-scope empirical equations linking streamflow and precipitation tend to produce more accurate estimates for individual streams: for example, equations based only on northeast Maui streams tend to predict northeast Maui stream flows better than equations based on all of Maui’s streams. However, specific equations do not exist for most regions of Maui. This paper finds that general and specific empirical equations for northeast Maui predict nearly identical aggregate streamflows. Irrigation ditch flow comprises aggregate streamflow from a given region, so it is likely that existing, general equations can predict irrigation ditch flows with acceptable accuracy.
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Sanchez Galan, Javier, Carlos Quintero, Fernando Merchan, and Aydee Cornejo. "Using Deep Convolutional Networks for the Automatic Recognition of MacroInvertebrate in Rivers and Affluents in Panama." In LatinX in AI at Neural Information Processing Systems Conference 2018. Journal of LatinX in AI Research, 2018. http://dx.doi.org/10.52591/lxai201812037.

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The determination of water quality in rivers is a very important task for ensuring the well-being of any population. Moreover, It is very laborious task, involving a combination of chemical and microbiological analysis techniques. A low cost alternative to achieve this same goal is the use of biomonitoring or recognition of macroinvertebrate organisms which presence or absence can be used to determine the water quality. Biomonitoring is often used in rural communities that use of natural streams for consumption and daily life. In those cases community members are often the ones obtaining the quality reports. Although it is an efficient method it has the disadvantage that it requires biological training both for the capture, and identification of macroinvertebrate present in water and watersheds. This work focuses on providing a tool to automate the recognition of freshwater macroinvertebrate images based on deep convolutional networks using the Python programming language, and the Tensorflow and Keras libraries.
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Almatrafi, Eydhah, Francesca Moloney, and D. Y. Goswami. "Performance Analysis of Solar Thermal Powered Supercritical Organic Rankine Cycle Assisted Low-Temperature Multi Effect Desalination Coupled With Mechanical Vapor Compression." In ASME 2018 Power Conference collocated with the ASME 2018 12th International Conference on Energy Sustainability and the ASME 2018 Nuclear Forum. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/power2018-7307.

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Power and freshwater demand are increasing as populations around the world keep growing. Due to the environmental impact of using fossil fuels and limited resources, using solar thermal in desalination application is a valuable option. In this paper, an innovative new design of low temperature multi-effect desalination coupled with mechanical vapor compression (LT-MED-MVC) powered by supercritical organic Rankine cycle utilizing a low-grade solar heat source using evacuated tube collectors is analyzed. The proposed design has the potential to desalinate water of high salt concentrations or brine with high salinity more than 100,000 ppm or effluent streams from a power plant with low energy consumption and high efficiency when compared to the previously discussed systems. The performance of the LT-MED-MVC was found to be better than similar systems found in the literature. The specific power consumption for MVC is lower than 4 kWh/m3 for seawater feed salinity of 100,000 ppm, 14 forward feed effects, and a recovery rate of 50%. The overall system efficiency is about 14%. The impact of increasing the number of effects, motive steam temperature, pressure of supercritical-ORC and salt concentration on the specific power consumption, solar collector area, and the system efficiency are also analyzed.
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Zubair, Muhammad, and Aman Ullah. "Chicken Feathers Keratin/ Modified Graphene Oxide Based Biosorbent for Water Remediation." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/xygc9438.

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Water is one of the most precious resources on the earth and is a life source for all the living organisms. Around 75% of industrial wastewater is being discharged into the freshwater streams and 38% of it released untreated. Worldwide, wastewater from oil sands projects is being released into the water bodies and severely polluting the water resources. The tailings pond water contains toxic metals including lead, cadmium, arsenic, nickel, chromium, and selenium. Reverse osmosis, filtration and disinfection are being used to address the water quality issues. However, these have high cost, shorter life and poor adsorption capacity. We developed an eco-friendly biosorbent from chicken feathers with potential to remove heavy metals. Keratin from chicken feathers is an almost infinite source of natural protein ( >92%). Poultry feathers have a few applications, but large quantities are disposed in landfills that create environmental issues. Chicken feathers were washed, ground, and dissolved using reducing agent. Keratin was isolated from the solution using dialysis followed by freeze drying. Finally, biosorbent was obtained by treating powdered keratin with water dispersed modified graphene oxide and polymerized at high temperature. The biosorbents was tested for metals removal from synthetic contaminated water with concentration of 600, 1000 and 2000 ppb. Adsorption studies were performed using ICP-MS and compared with the commercially available adsorbents. Our study revealed that adsorbent can remove As, Se, Pb, Cu, Cd and Cr with adsorption capacity between 80-99% from the polluted water. This excellent adsorption capacity was ascribed to the incorporation of graphene oxide which increased the surface affinity of the keratin to adsorb heavy metals easily. The synthesis of environmentally benign adsorbent from chicken feathers showed potential to be implemented on larger scale. The study will also provide an alternate for chicken feathers utilization instead of simple disposal that causes environmental concerns.
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KALVITE, Zane, Zane LIBIETE, and Arta BARDULE Arta BARDULE. "FOREST MANAGEMENT AND WATER QUALITY IN LATVIA: IDENTIFYING CHALLENGES AND SEEKING SOLUTIONS." In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.146.

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Rise in human population, industrialization, urbanization, intensified agriculture and forestry pose considerable risks to water supply and quality both on global and regional scale. While freshwater resources are abundant in Latvia, during recent years increased attention has been devoted to water quality in relation to anthropogenic impacts. Forest cover in Latvia equals 52% and forest management and forest infrastructure building and maintenance are among the activities that may, directly or indirectly, affect water quality in headwater catchments. Sedimentation, eutrophication and export of hazardous substances, especially mercury (Hg), are of highest concern. To address these topics, several initiatives have started recently. In 2011, cooperation programme between Latvian State Forest Research Institute (LSFRI) “Silava” and JSC “Latvia’s State Forests” was launched to evaluate the impact of forest management on the environment. This programme included research on the efficiency of water protection structures used at drainage system maintenance (sedimentation ponds, overland flow) and regeneration felling (bufferzones). In 2016, within the second stage of this cooperation programme, a study on the impact of forest management on water quality (forest road construction, drainage system maintenance, felling) was started on a catchment scale. Since 2016 LSFRI Silava is partner in the Interreg Baltic Sea Region Programme project “Water management in Baltic forests”. By focusing on drainage systems, riparian zones and beaver activity, this project aims at reducing nutrient and Hg export from forestry sites to streams and lakes. While this project mostly has a demonstration character, it will also offer novel results on Hg and methylmercury (MeHg) concentrations in beaver ponds in all participating states. This paper aims at summarizing most important challenges related to the impact of forest management on water quality and corresponding recent initiatives striving to offer solutions.
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Sánchez-Murillo, Ricardo. "DOC transport and export in a dynamic tropical catchment." In I Congreso Internacional de Ciencias Exactas y Naturales. Universidad Nacional, 2019. http://dx.doi.org/10.15359/cicen.1.35.

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Dissolved organic carbon (DOC) transport and export from headwater forests into freshwaters in highly dynamic tropical catchments are still understudied. Here, we present a DOC analysis (2017) in a pristine and small (~2.6 km2) tropical catchment of Costa Rica. Storm flows governed a rapid surface and lateral allochthonous DOC transport (62.2% of the annual DOC export). Cross-correlation analysis of rainfall and stream discharge indicated that DOC transport occurred on average ~1.25 hours after the rainfall maxima, with large contributions of event water, ranging from 42.4±0.3% up to 98.2±0.3% of the total discharge. Carbon export flux (annual mean=6.7±0.1 g C m-2 yr-1) was greater than values reported in subtropical and temperate catchments. Specific ultraviolet absorbance indicated a mixture of hydrophobic humic and hydrophilic non-humic matter during both baseflow and storm events. Our results highlight the rapid storm-driven DOC transport and export as well as low biogeochemical attenuation during baseflow episodes in a climate sensitive hot-spot. By understanding the key factors controlling the amount of organic carbon transported to streams in dynamic tropical landscapes, better global and catchment-scale model assessments, conservation practices, and water treatment innovations can be identified.
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Oviroh, Peter Ozaveshe, Sunday Temitope Oyinbo, Sina Karimzadeh, and Tien-Chien Jen. "Multilayer Separation Effects on MoS2 Membranes in Water Desalination." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-69156.

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Abstract Climate change and its related effects are imposing severe stress on the current freshwater supplies. This has been exacerbated due to the growth in population, rapid industrialization, and increased energy demand. Increased water requirement is a global challenge. Although more than 70% of the Earth is covered by water, much of it is unusable for human use. Freshwater reservoirs, ponds, and subterranean aquifers account for just 2.5% of the world’s overall freshwater availability. Unfortunately, these water supplies are not very unevenly spread. Therefore, the need to augment these supplies through the desalination of seawater or brackish water. Reverse osmosis (RO) is currently the most widespread method of desalination. However, the unit cost of water is still high partly due to the thin-film composite (TFC) polymer membranes used in the current desalination system. Thus the need for low-cost nanomaterials for Water Desalination and Purification. A promising way to meet this demand is to use two-dimensional (2D) nanoporous materials such as graphene and MoS2 to minimize energy consumption during the desalination process. New nanotechnology methodologies that apply reverse osmosis have been developed. Among some of these technologies is using 2D materials such as graphene and MoS2, which have been studied extensively for water desalination. Single-layer nanoporous 2D materials such as graphene and MoS2 promises better filtrations in the water channel. Although single-layer MoS2 (SL_MoS2) membrane have much promise in the RO desalination membrane, multilayer MoS2 are simpler to make and more cost-efficient. Building on the SL_MoS2 membrane knowledge, we have used the molecular dynamics method (MD) to explore the effects of multilayer MoS2 in water desalination. This comparison is made as a function of the pore size, water flow rate and salt rejection. In addition, we also looked at the effect of the increased interlayer spacing between layers of the nanoporous 2D membrane and then made the comparison. The ions rejection follows the trend trilayer> bilayer> monolayer from results obtained, averaging over all three membrane types studied for the MoS2, the ions rejection follows the trend trilayer > bilayer > monolayer. We find that the thin, narrow layer separation plays a vital role in the successful rejection of salt ions in bilayers and trilayers membranes. These findings will help build and proliferate tunable nanodevices for filtration and other applications.
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Zhu, Yuliang, Xiaoyan Wei, and Chencheng Xu. "The Salt Flux in the Pearl River Delta, China." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83737.

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The increase of saltwater intrusion in recent years in the Pearl River Delta, has threatened the freshwater supply in the surrounding regions, especially the cities of Zhongshan, Zhuhai, Guangzhou in Guangdong Province and Macau. A numerical modeling system using nested grids was developed to simulate the salinity distribution in the Pearl River delta, and then to investigate the salt transport process and calculate the salt flux for each outlet in the Pearl River estuary. The model forcing functions consist of tidal elevations along the open boundaries and freshwater inflows from the major tributaries in the Pearl River system. The model simulation results are in qualitative agreement with the available field data. The salt flux of the Pearl River delta during the spring tide in dry season is up to 19.5×106ton/ tidal period, while the salt flux during neap tide is only 5.1×106ton/ tidal period, 26.18% of that during the spring tide. The salt flux in Dahu and Guanchong stations are the highest among the stations of the eight outlets, indicating that Humen and Yamen are the most important entries for saltwater intrusion in the Pearl River delta. The most important reason is that the ratio of stream flow to tide flow is different for each outlet. The ratios at Humen and Yamen are the smallest among the eight outlets (<1 for each month), while the ratio at Modaomen is the biggest (>1 for each month), which leads to the lowest salt flux at Modaomen. Salinity distribution in different time periods shows that saltwater intrusion during the spring tide is much more serious than neap tide, and water in many cities during this time period will be unavailable for drinking, irrigation or for ecological purpose.
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Reports on the topic "Freshwater streams"

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Bowles, David, Michael Williams, Hope Dodd, Lloyd Morrison, Janice Hinsey, Tyler Cribbs, Gareth Rowell, Michael DeBacker, Jennifer Haack-Gaynor, and Jeffrey Williams. Protocol for monitoring aquatic invertebrates of small streams in the Heartland Inventory & Monitoring Network: Version 2.1. National Park Service, April 2021. http://dx.doi.org/10.36967/nrr-2284622.

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The Heartland Inventory and Monitoring Network (HTLN) is a component of the National Park Service’s (NPS) strategy to improve park management through greater reliance on scientific information. The purposes of this program are to design and implement long-term ecological monitoring and provide information for park managers to evaluate the integrity of park ecosystems and better understand ecosystem processes. Concerns over declining surface water quality have led to the development of various monitoring approaches to assess stream water quality. Freshwater streams in network parks are threatened by numerous stressors, most of which originate outside park boundaries. Stream condition and ecosystem health are dependent on processes occurring in the entire watershed as well as riparian and floodplain areas; therefore, they cannot be manipulated independently of this interrelationship. Land use activities—such as timber management, landfills, grazing, confined animal feeding operations, urbanization, stream channelization, removal of riparian vegetation and gravel, and mineral and metals mining—threaten stream quality. Accordingly, the framework for this aquatic monitoring is directed towards maintaining the ecological integrity of the streams in those parks. Invertebrates are an important tool for understanding and detecting changes in ecosystem integrity, and they can be used to reflect cumulative impacts that cannot otherwise be detected through traditional water quality monitoring. The broad diversity of invertebrate species occurring in aquatic systems similarly demonstrates a broad range of responses to different environmental stressors. Benthic invertebrates are sensitive to the wide variety of impacts that influence Ozark streams. Benthic invertebrate community structure can be quantified to reflect stream integrity in several ways, including the absence of pollution sensitive taxa, dominance by a particular taxon combined with low overall taxa richness, or appreciable shifts in community composition relative to reference condition. Furthermore, changes in the diversity and community structure of benthic invertebrates are relatively simple to communicate to resource managers and the public. To assess the natural and anthropo-genic processes influencing invertebrate communities, this protocol has been designed to incorporate the spatial relationship of benthic invertebrates with their local habitat including substrate size and embeddedness, and water quality parameters (temperature, dissolved oxygen, pH, specific conductance, and turbidity). Rigid quality control and quality assurance are used to ensure maximum data integrity. Detailed standard operating procedures (SOPs) and supporting information are associated with this protocol.
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Tronstad, Lusha. Aquatic invertebrate monitoring at Agate Fossil Beds National Monument: 2019 data report. National Park Service, April 2022. http://dx.doi.org/10.36967/nrds-2293128.

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Monitoring ecosystems is vital to understanding trends over time and key to detecting change so that managers can address perturbations. Freshwater streams are the lifeblood of the surrounding landscape, and their health is a measure of the overall watershed integrity. Streams are the culmination of upland processes and inputs. Degradation on the landscape as well as changes to the stream itself can be detected using biota living in these ecosystems. Aquatic invertebrates are excellent indicators of ecosystem quality because they are relatively long-lived, sessile, diverse, abundant and their tolerance to perturbation differs. Aquatic invertebrates were monitored at three sites along the Niobrara River at Agate Fossil Beds National Monument in 2019 completing 23 years of data using Hester-Dendy and Hess samplers. Hess samplers are artificial multi-plate samplers suspended in the water column to allow invertebrates to colonize and Hess samples collect invertebrates in a known area on natural substrate and vegetation. We identified 45 invertebrate taxa from four phyla (Annelida, Arthropoda, Mollusca, Nematoda) using both samplers in the Niobrara River (Appendix A and B). Hester-Dendy samplers collected 4 taxa not found in Hess samples and Hess samples collected 17 taxa not collected with Hester-Dendy samplers. Hess samples captured more (91%) than Hester-Dendy samples (62%). Crustacea, Diptera and Ephemeroptera were the most abundant groups of invertebrates collected in the Niobrara River. The proportion of Insecta, Annelida, Trichoptera and Diptera differed between Hester-Dendy and Hess samples (p < 0.05). EPT richness, proportion EPT taxa and Hilsenhoff’s Biotic Index (HBI) (p < 0.0001) differed between sampler types, but taxa richness, taxa diversity and evenness (p > 0.29) did not. We collected the highest density of invertebrates at the Agate Middle site. Agate Spring Ranch had the lowest taxa richness and HBI, and the highest proportion of EPT taxa. HBI at the sites ranged from 4.0 to 6.3 (very good to fair from Hilsenhoff 1987) using the Hester-Dendy and 5.2 to 6.9 (good to fairly poor from Hilsenhoff 1987) using the Hess sampler.
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Pokrzywinski, Kaytee, Kaitlin Volk, Taylor Rycroft, Susie Wood, Tim Davis, and Jim Lazorchak. Aligning research and monitoring priorities for benthic cyanobacteria and cyanotoxins : a workshop summary. Engineer Research and Development Center (U.S.), August 2021. http://dx.doi.org/10.21079/11681/41680.

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In 2018, the US Army Engineer Research and Development Center partnered with the US Army Corps of Engineers–Buffalo District, the US Environmental Protection Agency, Bowling Green State University, and the Cawthron Institute to host a workshop focused on benthic and sediment-associated cyanobacteria and cyanotoxins, particularly in the context of harmful algal blooms (HAB). Technical sessions on the ecology of benthic cyanobacteria in lakes and rivers; monitoring of cyanobacteria and cyanotoxins; detection of benthic and sediment-bound cyanotoxins; and the fate, transport, and health risks of cyanobacteria and their associated toxins were presented. Research summaries included the buoyancy and dispersal of benthic freshwater cyanobacteria mats, the fate and quantification of cyanotoxins in lake sediments, and spatial and temporal variation of toxins in streams. In addition, summaries of remote sensing methods, omic techniques, and field sampling techniques were presented. Critical research gaps identified from this workshop include (1) ecology of benthic cyanobacteria, (2) identity, fate, transport, and risk of cyanotoxins produced by benthic cyanobacteria, (3) standardized sampling and analysis protocols, and (4) increased technical cooperation between government, academia, industry, nonprofit organizations, and other stakeholders. Conclusions from this workshop can inform monitoring and management efforts for benthic cyanobacteria and their associated toxins.
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Albright, Jeff, Kim Struthers, Lisa Baril, John Spence, Mark Brunson, and Ken Hyde. Natural resource conditions at Glen Canyon National Recreation Area: Findings & management considerations for selected resources. National Park Service, April 2022. http://dx.doi.org/10.36967/nrr-2293112.

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Glen Canyon National Recreation Area (GLCA) encompasses more than 0.5 million ha (1.25 million ac) and extends over 322 km (200 mi) from its northern boundary in southern Utah to its southern boundary in northern Arizona. It is one of the most rugged, remote, and floristically diverse national parks on the Southern Colorado Plateau (Thomas et. al 2005) and has more than 4,900 km (3,045 mi) of waterways flowing through its eight Hydrologic Unit Code (HUC 8) watersheds. GLCA’s larger perennial rivers include the Colorado, Escalante, Dirty Devil, San Juan, and Paria, with smaller perennial and intermittent streams flowing into each of these rivers. After the creation of the Glen Canyon Dam, Lake Powell formed, covering 13% of the park’s total land area when full and the national recreation area attracts over 4 million visitors annually, and in 2019 GLCA ranked 19th highest in recreational visits out of all national parks. The National Park Service Natural Resource Condition Assessment Program selected GLCA to pilot its new NRCA project series. NRCA projects evaluate the best available science to provide park managers with reliable, actionable information pertaining to natural resource conditions in their park. For the park-selected focal study resources, this includes consideration of drivers and stressors known or suspected of influencing resource conditions; assessment of current conditions and trends for indicators of condition; and potential near-term and future activities or actions managers can consider, improving their knowledge and management of natural resources in parks. For focal resources that lack adequate data to assess current conditions, a gap analysis is provided (in lieu of a condition assessment) to highlight the present status of knowledge of the resource and to suggest useful indicators, data, and studies for further consideration and investigation. Park managers are encouraged to identify information needs and pose questions during the NRCA scoping process, with the understanding that information will be provided to help address those needs and answer those questions when possible. For a comprehensive list of GLCA managers’ questions and needs, please refer to Appendix A, Table A-1. The focus of GLCA’s NRCA study was the water-dependent resources—tinajas, springs & seeps, including water quality, riparian zone, amphibians, including the northern leopard frog (Lithobates pipiens), and small, native fishes—that are found off the mainstem Colorado River. Managers were interested in these particular environments and the natural resources that depend on them because they are less studied, and the habitats are “biodiversity hotspots” due to the intersection of complex desert and freshwater ecosystems in a region limited by water. The following summaries highlight the key findings of GLCA’s focal resource drivers and stressors (Chapter 2), states (Chapter 3), and manager responses (Chapter 4).
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Rosenberger, Amanda E., and Garth A. Lindner. Use of a riverscape-scale model of fundamental physical habitat requirements for freshwater mussels to quantify mussel declines in a mining-contaminated stream: the Big River, Old Lead Belt, Southeast Missouri. U.S. Fish and Wildlife Service, November 2022. http://dx.doi.org/10.3996/css78904468.

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Brine contamination of freshwater aquifers and streams in petroleum producing areas in Mississippi. US Geological Survey, 1986. http://dx.doi.org/10.3133/wri854117.

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Simulated effects of ground-water pumpage on stream-aquifer flow in the vicinity of federally protected species of freshwater mussels in the lower Apalachicola-Chattahoochee-Flint River basin (Subarea 4), southeastern Alabama, northwestern Florida, and southwestern Georgia. US Geological Survey, 2002. http://dx.doi.org/10.3133/wri20024016.

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