Relevant bibliographies by topics / Beaver dams

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Academic literature on the topic 'Beaver dams'

Author: Grafiati
Published: 4 June 2021
Last updated: 26 January 2023

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Journal articles on the topic "Beaver dams"

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Rurek, Mirosław. "Characteristics of Beaver Ponds and Landforms Induced by Beaver Activity, S Part of the Tuchola Pinewoods, Poland." Water 13, no. 24 (December 18, 2021): 3641. http://dx.doi.org/10.3390/w13243641.

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Currently, there are only two species of beavers described—the North American beaver (Castor canadensis) and Eurasian beaver (Castor fiber). Their natural habitats are confined to the northern hemisphere but instances of beaver introduction to regions of the world they do not normally inhabit have also been recorded. The activity of beavers leads to changes in the natural environment linked to hydrological and geomorphological and plant cover transformations. Beavers live in natural and artificial water reservoirs and rivers. If the water level in the river is too low, they build dams to create a comfortable living environment. This paper aims to present changes in the relief of the valley inhabited by beavers in which sediments accumulate. During the field study, detailed measurements of dams and of the spatial range of beaver ponds were made, and the thickness and spatial distribution of accumulated sediments were determined. In addition, measurements of geomorphological forms in beaver ponds were also made. The samples of sediments were subject to grain-size distribution analysis, the results of which allowed calculating sediment parameters. Beavers appeared in the Gajdówka valley in the southern part of the Tuchola Forest (Poland) in 2008. In 2008–2011 they built 17 beaver dams that impounded ponds. The beaver ponds and beaver dams were of different sizes. They either flooded the whole flat bottom of the valley or only raised the level of water in the riverbed. A characteristic feature of beaver ponds is that they capture sediments. Different landforms were created in the course of the formation and disappearance of beaver ponds. It was established that these include alluvial fans, levees, sand shadow dunes and microterraces formed by deposition and erosion. They do not occur in all ponds. Points at which mineral sediments are supplied to the watercourse, including beaver burrows and erosion hollows, are presented together with the points at which sediments are transferred from ponds upstream to ponds downstream the watercourse. Beaver activity during valley colonization shows changes in the landscape caused by their presence and in particular their impact on the relief and deposition of sediments. Analysis of contemporary changes in the morphology of the Gajdówka Valley leads to the conclusion that beaver activity has had an intense impact on the terrain relief of the valley inhabited by beavers.
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Jung, Thomas S., and Jennifer A. Staniforth. "Unusual Beaver, Castor canadensis, Dams in Central Yukon." Canadian Field-Naturalist 124, no. 3 (July 1, 2010): 274. http://dx.doi.org/10.22621/cfn.v124i3.1090.

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North American Beavers (Castor canadensis) are remarkable for their ability to build dams and modify their habitat. Dams are typically made of the boles and branches of trees and large shrubs, and reinforced with mud and rocks. Here, we report two unusual Beaver dams in central Yukon, Canada, that are made primarily of medium-sized rocks. This observation points to the adaptability of Beavers in using available materials to build their dams.
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Malison, Rachel L., Kirill V. Kuzishchin, and Jack A. Stanford. "Do beaver dams reduce habitat connectivity and salmon productivity in expansive river floodplains?" PeerJ 4 (September 1, 2016): e2403. http://dx.doi.org/10.7717/peerj.2403.

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Beaver have expanded in their native habitats throughout the northern hemisphere in recent decades following reductions in trapping and reintroduction efforts. Beaver have the potential to strongly influence salmon populations in the side channels of large alluvial rivers by building dams that create pond complexes. Pond habitat may improve salmon productivity or the presence of dams may reduce productivity if dams limit habitat connectivity and inhibit fish passage. Our intent in this paper is to contrast the habitat use and production of juvenile salmon on expansive floodplains of two geomorphically similar salmon rivers: the Kol River in Kamchatka, Russia (no beavers) and the Kwethluk River in Alaska (abundant beavers), and thereby provide a case study on how beavers may influence salmonids in large floodplain rivers. We examined important rearing habitats in each floodplain, including springbrooks, beaver ponds, beaver-influenced springbrooks, and shallow shorelines of the river channel. Juvenile coho salmon dominated fish assemblages in all habitats in both rivers but other species were present. Salmon density was similar in all habitat types in the Kol, but in the Kwethluk coho and Chinook densities were 3–12× lower in mid- and late-successional beaver ponds than in springbrook and main channel habitats. In the Kol, coho condition (length: weight ratios) was similar among habitats, but Chinook condition was highest in orthofluvial springbrooks. In the Kwethluk, Chinook condition was similar among habitats, but coho condition was lowest in main channel versus other habitats (0.89 vs. 0.99–1.10). Densities of juvenile salmon were extremely low in beaver ponds located behind numerous dams in the orthofluvial zone of the Kwethluk River floodplain, whereas juvenile salmon were abundant in habitats throughout the entire floodplain in the Kol River. If beavers were not present on the Kwethluk, floodplain habitats would be fully interconnected and theoretically could produce 2× the biomass (between June–August, 1,174 vs. 667 kg) and rear 3× the number of salmon (370,000 vs. 140,000) compared to the existing condition with dams present. The highly productive Kol river produces an order of magnitude more salmon biomass and rears 40× the individuals compared to the Kwethluk. If beavers were introduced to the Kol River, we estimate that off-channel habitats would produce half as much biomass (2,705 vs. 5,404 kg) and 3× fewer individuals (1,482,346 vs. 4,856,956) owing to conversion of inter-connected, productive springbrooks into inaccessible pond complexes. We concluded that beaver dams may limit the total amount of floodplain habitat available for salmon rearing in the Kwethluk river and that the introduction of beavers to the Kol river could be detrimental to salmon populations. The introduction of beavers to other large alluvial rivers like those found in Kamchatka could have negative consequences for salmon production.
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Butler, David R., and George P. Malanson. "The geomorphic influences of beaver dams and failures of beaver dams." Geomorphology 71, no. 1-2 (October 2005): 48–60. http://dx.doi.org/10.1016/j.geomorph.2004.08.016.

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Clifford, Hugh F., Gillian M. Wiley, and 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, no. 7 (July 1, 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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Majerova, M., B. T. Neilson, N. M. Schmadel, J. M. Wheaton, and C. J. Snow. "Impacts of beaver dams on hydrologic and temperature regimes in a mountain stream." Hydrology and Earth System Sciences Discussions 12, no. 1 (January 22, 2015): 839–78. http://dx.doi.org/10.5194/hessd-12-839-2015.

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Abstract. Beaver dams affect hydrologic processes, channel complexity, and stream temperature by increasing inundated areas and influencing groundwater-surface water interactions. We explored the impacts of beaver dams on hydrologic and temperature regimes at different spatial and temporal scales within a mountain stream in northern Utah over a three-year period spanning pre- and post-beaver colonization. Using continuous stream discharge, stream temperature, synoptic tracer experiments, and groundwater elevation measurements we documented pre-beaver conditions in the first year of the study. In the second year, we captured the initial effects of three beaver dams, while the third year included the effects of ten dams. After beaver colonization, reach scale discharge observations showed a shift from slightly losing to gaining. However, at the smaller sub-reach scale, the discharge gains and losses increased in variability due to more complex flow pathways with beaver dams forcing overland flow and increasing surface and subsurface storage. At the reach scale, temperatures were found to increase by 0.38 °C (3.8%), which in part is explained by a 230% increase in mean reach residence time. At the smallest, beaver dam scale, there were notable increases in the thermal heterogeneity where warmer and cooler niches were created. Through the quantification of hydrologic and thermal changes at different spatial and temporal scales, we document increased variability during post-beaver colonization and highlight the need to understand the impacts of beaver dams on stream ecosystems and their potential role in stream restoration.
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Puttock, A. K., A. M. Cunliffe, K. Anderson, and R. E. Brazier. "Aerial photography collected with a multirotor drone reveals impact of Eurasian beaver reintroduction on ecosystem structure." Journal of Unmanned Vehicle Systems 3, no. 3 (September 2015): 123–30. http://dx.doi.org/10.1139/juvs-2015-0005.

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Beavers are often described as ecological engineers with an ability to modify the structure and flow of fluvial systems and create complex wetland environments with dams, ponds, and canals. Consequently, beaver activity has implications for a wide range of environmental ecosystem services including biodiversity, flood risk mitigation, water quality, and sustainable drinking water provision. With the current debate surrounding the reintroduction of beavers into the United Kingdom, it is critical to be able to monitor the impact of beavers upon the environment. This study presents the first proof of concept results showing how a lightweight hexacopter fitted with a simple digital camera can be used to derive orthophoto and digital surface model (DSM) data products at a site where beavers have recently been reintroduced. Early results indicate that analysis of the fine-scale (0.01 m) orthophoto and DSM can be used to identify impacts on the ecosystem structure including the extent of dams and associated ponds, and changes in vegetation structure due to beaver tree-felling activity. Unmanned aerial vehicle data acquisition offers an effective toolkit for regular repeat monitoring at fine spatial resolution, which is a critical attribute for monitoring rapidly changing and difficult to access beaver-impacted ecosystems.
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Jones, Benjamin M., Ken D. Tape, Jason A. Clark, Allen C. Bondurant, Melissa K. Ward Jones, Benjamin V. Gaglioti, Clayton D. Elder, Chandi Witharana, and Charles E. Miller. "Multi-Dimensional Remote Sensing Analysis Documents Beaver-Induced Permafrost Degradation, Seward Peninsula, Alaska." Remote Sensing 13, no. 23 (November 30, 2021): 4863. http://dx.doi.org/10.3390/rs13234863.

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Beavers have established themselves as a key component of low arctic ecosystems over the past several decades. Beavers are widely recognized as ecosystem engineers, but their effects on permafrost-dominated landscapes in the Arctic remain unclear. In this study, we document the occurrence, reconstruct the timing, and highlight the effects of beaver activity on a small creek valley confined by ice-rich permafrost on the Seward Peninsula, Alaska using multi-dimensional remote sensing analysis of satellite (Landsat-8, Sentinel-2, Planet CubeSat, and DigitalGlobe Inc./MAXAR) and unmanned aircraft systems (UAS) imagery. Beaver activity along the study reach of Swan Lake Creek appeared between 2006 and 2011 with the construction of three dams. Between 2011 and 2017, beaver dam numbers increased, with the peak occurring in 2017 (n = 9). Between 2017 and 2019, the number of dams decreased (n = 6), while the average length of the dams increased from 20 to 33 m. Between 4 and 20 August 2019, following a nine-day period of record rainfall (>125 mm), the well-established dam system failed, triggering the formation of a beaver-induced permafrost degradation feature. During the decade of beaver occupation between 2011 and 2021, the creek valley widened from 33 to 180 m (~450% increase) and the length of the stream channel network increased from ~0.6 km to more than 1.9 km (220% increase) as a result of beaver engineering and beaver-induced permafrost degradation. Comparing vegetation (NDVI) and snow (NDSI) derived indices from Sentinel-2 time-series data acquired between 2017 and 2021 for the beaver-induced permafrost degradation feature and a nearby unaffected control site, showed that peak growing season NDVI was lowered by 23% and that it extended the length of the snow-cover period by 19 days following the permafrost disturbance. Our analysis of multi-dimensional remote sensing data highlights several unique aspects of beaver engineering impacts on ice-rich permafrost landscapes. Our detailed reconstruction of the beaver-induced permafrost degradation event may also prove useful for identifying degradation of ice-rich permafrost in optical time-series datasets across regional scales. Future field- and remote sensing-based observations of this site, and others like it, will provide valuable information for the NSF-funded Arctic Beaver Observation Network (A-BON) and the third phase of the NASA Arctic-Boreal Vulnerability Experiment (ABoVE) Field Campaign.
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Majerova, M., B. T. Neilson, N. M. Schmadel, J. M. Wheaton, and C. J. Snow. "Impacts of beaver dams on hydrologic and temperature regimes in a mountain stream." Hydrology and Earth System Sciences 19, no. 8 (August 11, 2015): 3541–56. http://dx.doi.org/10.5194/hess-19-3541-2015.

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Abstract. Beaver dams affect hydrologic processes, channel complexity, and stream temperature in part by inundating riparian areas, influencing groundwater–surface water interactions, and changing fluvial processes within stream systems. We explored the impacts of beaver dams on hydrologic and temperature regimes at different spatial and temporal scales within a mountain stream in northern Utah over a 3-year period spanning pre- and post-beaver colonization. Using continuous stream discharge, stream temperature, synoptic tracer experiments, and groundwater elevation measurements, we documented pre-beaver conditions in the first year of the study. In the second year, we captured the initial effects of three beaver dams, while the third year included the effects of ten dams. After beaver colonization, reach-scale (~ 750 m in length) discharge observations showed a shift from slightly losing to gaining. However, at the smaller sub-reach scale (ranging from 56 to 185 m in length), the discharge gains and losses increased in variability due to more complex flow pathways with beaver dams forcing overland flow, increasing surface and subsurface storage, and increasing groundwater elevations. At the reach scale, temperatures were found to increase by 0.38 °C (3.8 %), which in part is explained by a 230 % increase in mean reach residence time. At the smallest, beaver dam scale (including upstream ponded area, beaver dam structure, and immediate downstream section), there were notable increases in the thermal heterogeneity where warmer and cooler niches were created. Through the quantification of hydrologic and thermal changes at different spatial and temporal scales, we document increased variability during post-beaver colonization and highlight the need to understand the impacts of beaver dams on stream ecosystems and their potential role in stream restoration.
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Nummi, Petri, Wenfei Liao, Juliette van der Schoor, and John Loehr. "Beaver creates early successional hotspots for water beetles." Biodiversity and Conservation 30, no. 10 (June 4, 2021): 2655–70. http://dx.doi.org/10.1007/s10531-021-02213-8.

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AbstractBeavers (Castor spp.) are ecosystem engineers that induce local disturbance and ecological succession, which turns terrestrial into aquatic ecosystems and creates habitat heterogeneity in a landscape. Beavers have been proposed as a tool for biodiversity conservation and ecosystem restoration. So far, most research has compared biodiversity in beaver wetlands and non-beaver wetlands, but few studies have explored how beaver-created succession affects specific taxa. In this study, we investigated how water beetles responded to different successional stages of wetlands in a beaver-disturbed landscape at Evo in southern Finland. We sampled water beetles with 1-L activity traps in 20 ponds, including: 5 new beaver ponds, 5 old beaver ponds, 5 former beaver ponds, and 5 never engineered ponds. We found that beaver wetlands had higher species richness and abundance than non-beaver wetlands, and that new beaver wetlands could support higher species richness (321%) and abundance (671%) of water beetles compared to old beaver wetlands. We think that higher water beetle diversity in new beaver ponds has resulted from habitat amelioration (available lentic water, shallow shores, aquatic vegetation, and low fish abundance) and food source enhancement (an increase of both dead and live prey) created by beaver dams and floods. We conclude that using beavers as a tool, or imitating their way of flooding, can be beneficial in wetland restoration if beaver population densities are monitored to ensure the availability of newly colonizable sites.
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Dissertations / Theses on the topic "Beaver dams"

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Johansson, Andreas. "Effects of beaver dams on benthic macroinvertebrates." Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-396803.

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In the 1870's the beaver (Castor fiber), population in Sweden had been exterminated. Thebeaver was reintroduced to Sweden from the Norwegian population between 1922 and 1939.Today the population has recovered and it is estimated that the population of C. fiber in all ofEurope today ranges around 639,000 individuals. The main aim with this study was toinvestigate if there was any difference in species diversity between sites located upstream anddownstream of beaver ponds. I found no significant difference in species diversity betweenthese sites and the geographical location of the streams did not affect the species diversity.This means that in future studies it is possible to consider all streams to be replicates despiteof geographical location. The pond age and size did on the other hand affect the speciesdiversity. Young ponds had a significantly higher diversity compared to medium-aged ponds.Small ponds had a significantly higher diversity compared to medium-sized and large ponds.The upstream and downstream reaches did not differ in terms of CPOM amount but somewater chemistry variables did differ between them. For the functional feeding groups I onlyfound a difference between the sites for predators, which were more abundant downstream ofthe ponds.
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Jasiulionis, Marius. "Bebrų (Castor fiber L.) poveikis ir jo tendencijos melioracijos sistemose." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2007~D_20090908_194020-67364.

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Daugiau, kaip 80 % hidrografinio tinklo Lietuvoje sudaro melioracijos kanalai. Daugiau kaip 30 % bebrų populiacijos gyvena šiuose kanaluose. Bebrų veikla neretai trikdo normalų melioracijos sistemų funkcionavimą. Tyrimui pasirinktos dviejuose skirtinguose kraštovaizdžiuose esančios bebravietės (Molėtų bei Panevėžio rajonuose). Šiame darbe buvo tiriama bebraviečių tankumas, pasiskirstymas, erdvinės charakteristikos bei statybinės veiklos intensyvumas melioracijos kanaluose. Nustatytas bebrų poveikio mastas bei šio masto pokyčiai. Ištirtose teritorijose bebrų veikiama pusė melioracijos kanalų linijinio ilgio. Per 10 metų (1995-2005) bebraviečių skaičius melioracijos kanaluose praktiškai nepakito, taigi nekito ir melioracijos sistemoms daromas poveikis.
More than 80 % of hydro-graphical network in Lithuania is composed of drainage channels. More than 30 % of beaver populations in Lithuania live in drainage channels. Beaver activity often dislocates irrigations systems. This research was taken in two different landscapes. Beaver sites were visited in Moletai and Panevezys districts. Density, spread, dimensions and constructional activity were recorded in drainage channels. Also this study shows influence over the environment of changing number in beaver populations. Half of linear lengths of irrigation systems are influenced by beaver activity. The number of beaver sites did not change in a ten year period (1995-2005) as well as did not change the damage caused by beaver activity.
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Barnes, Don M. "Beaver dams, their site selection, establishment, and impact in a Northern Ontario watershed." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0005/MQ33340.pdf.

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Jones, Kevin Christopher. "Ecological effects of the feeding and construction activities of the Eurasian beaver (Castor fiber) in Scotland : implications for reintroduction." Thesis, University of Stirling, 2006. http://hdl.handle.net/1893/211.

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Beavers have been described as a “keystone species” and “ecosystem engineers”, and in this dual role have great potential to physically modify their environment through tree-felling, foraging and construction activities. The resultant change in habitat heterogeneity can affect the flora and fauna that share the habitat with them. There has been recent interest in reintroducing the Eurasian beaver to the United Kingdom after an absence of over 400 years. To date, no research (aside from this thesis) has focussed on beaver ecology and behaviour in Scotland. This study has investigated the ecological effects of a small number of beavers in two enclosed but semi-natural Scottish sites at Bamff in Perthshire. The research conducted over a three-year period, with particular emphasis on the effects of tree-felling, foraging and construction activities. Trees were felled for both dietary and construction purposes, with felling rates being influenced by habitat availability, quality and the degree of habitat modification required. Highest rates were evident during the initial colonisation period of marginal sites (c. >300 trees / beaver / calendar year), and lowest rates in later years of occupation of more optimal sites (c. 55 – 70 trees / beaver / calendar year). Preferences were generally for willow and aspen trees, with conifers almost entirely avoided, and smaller trees preferred over larger ones. Proximity of trees to waterbodies was also an important factor, with nearer trees favoured, and generally most felling occurred within 50 m of water. Such behaviour followed the principles of optimal central place foraging. These preferences were less predictable however when intense construction activity was undertaken, with larger trees preferred and generic preferences for deciduous trees apparently invalid. In such cases, close proximity to the construction site was of prime importance. Increased cover of herbaceous plant species was observed in beaver-created canopy gaps in riparian woodland, whilst macrophyte diversity within waterbodies increased slightly in areas of herbaceous grazing. The diversity of terrestrial ground invertebrates was highest in areas of heavy tree-felling, and invertebrate richness and abundance was greatest in areas of herbaceous grazing under an intact tree-canopy. Furthermore, the abundance, diversity and richness of macroinvertebrate communities were increased by beaver-generated woody debris in ponds and streams. Overall, 30% of all macroinvertebrate species collected were found only in beaver-affected areas, due to the refugia and food supply provided by beaver dams, caches and lodges, as well as hydrological effects of these structures. These results are discussed with reference to future plans to return the beaver to Scotland. The habitat usage and modification of riparian ecosystems in northern Britain is likely to be similar to that found in this study, and the results are believed to be relevant, applicable and transferable to many areas of Scotland.
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Shew, Ashley. "Beaver Dams, Spider Webs, and the Sticky Wicket: An Investigation On What Counts as Technology and What Counts as Knowledge." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/32812.

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Philosophers of technology have often considered only the tools and processes used and conducted by humans, but natural structures and man-made structures are not always easily discernable from one another. The complexity of a spider web is not matched by many human-made technologies. Beaver dams, beehives, and ant hills are great creations made by non-human animals. Davis Baird has argued that our scientific instruments bear knowledge in important ways, and the idea of technological knowledge bears interestingly on discussions of natural artifacts. Baird thinks his argument for instruments bearing knowledge can be extended, but how far can it be taken? Do â naturalâ technologies, like spider webs, bear technological knowledge of some sort? This move to consider whether natural artifacts might bear knowledge rubs interestingly against current definitions of technology which include human agency or progression as important. If we find that some natural artifacts seem to bear knowledge in the way Baird describes, technological knowledge would not be the exclusive domain of humans. Our current definitions of technology seem incongruent with our view of knowledge and our knowledge of natural artifacts. The purpose of this paper is to sort out the inconsistencies between current philosophical literature on knowledge and on technology. In sorting out the inconsistencies we find, I recommend a spectrum approach with regard to technology based on the epistemological status of the artifact. Using observations from anthropology and biology, I suggest a scale with regard to technological behavior, tool use, and technology.
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Doherty, Shannon Joele. "Spatio-temporal Patterns in Beaver Pond Complexes as Habitat for Eastern Spotted Newts (Notophthalmus viridescens) in a Hemlock-northern-hardwood Zone in Western New York State." Youngstown State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1452091312.

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Roen, Scott. "Maintaining the centrality of expository preaching while addressing issues of church health at Harvest Evangelical Free Church in Beaver Dam, Wisconsin." Theological Research Exchange Network (TREN) Access this title online, 2005. http://www.tren.com.

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Lofgren, Sean Joseph. "Using Lidar Derived Information for Predicting Beaver Dam Site Selection at Mingo National Wildlife Refuge." Thesis, North Dakota State University, 2012. https://hdl.handle.net/10365/26817.

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Characterizing features that influence beaver (Castor Canadensis) to select a site to construct a dam may have important implications for managing damage to select stands of bottomland hardwood forest by beaver activity. This study was initiated to determine and develop a quick and simple approach for managers to determine areas of most concern. Advanced Light Detection and Ranging (LiDAR) was collected for the study area in November of 2009. The study utilized software that has been developed to extract topographic features from a Digital Elevation Model (DEM). The extracted data was used to identify landscape variables to try and specify presence, future presence, and suitability of an area to support dam sites. This study, however, found that the development and use of such advanced LiDAR and DEM creation was error prone, which resulted in errors in the metrics that were calculated relative to the DEM.
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Hafen, Konrad. "To What Extent Might Beaver Dam Building Buffer Water Storage Losses Associated with a Declining Snowpack?" DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/6503.

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Dam building activity by North American Beaver (Castor canadensis) alters the timing and delivery of stream water and facilitates groundwater infiltration, overall increasing natural water storage behind and adjacent to dams. At the stream reach scale, increased water storage often alters hydrologic regimes by attenuating annual, and storm-event hydrographs, and increasing base flows. In the montane west, the most important water storage reservoirs are not human-made dams, but mountain snowpack, which slowly releases water through a mix of runoff and infiltration. Given estimates of decreasing snowpack with warming temperatures, beaver dams could provide a conceptually similar function to snowpack by delaying the delivery of precipitation by increasing surface and groundwater storage, thus lengthening residence time as water travels downstream. However, lack of predictive methods for modeling storage increases associated with relatively small magnitude beaver ponds at large spatial scales has precluded further investigation of this hypothesis. I address this knowledge gap by supplementing existing empirical data regarding the height of beaver dams and implement these empirical height distributions to develop the Beaver Dam Surface Water Estimation Algorithm (Chapter 2), a predictive model estimating beaver pond water storage that can be applied spatially at large scales. I then apply this model to estimate potential surface water storage and parameterize a groundwater model to estimate resulting groundwater storage increases for the entire Bear River basin under four different beaver dam capacity scenarios (Chapter 3). Estimated water storage changes from beaver dams are presented in the context of expected reductions in average annual maximum snow water equivalent, and existing and proposed reservoir storage within the basin. While the water storage provided by beaver dams is only a small fraction of expected snow water equivalent loss, it is not insubstantial and may prove beneficial for ecosystems where human-made reservoirs are not available to regulate hydrologic regimes. These results also stress the importance of further research examining how the cumulative effects of dams may affect the timing of runoff under changing precipitation regimes.
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Moog, Anne. "Das Bild des Beamten in der Öffentlichkeit : das Wirksamwerden von Beamtenstereotypen aus individualpsychologischer Sicht /." Hamburg : Kovač, 2008. http://www.verlagdrkovac.de/978-3-8300-3297-7.htm.

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Books on the topic "Beaver dams"

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Kim, Susan. Baby beaver rescue. New York: Simon Spotlight/Nickelodeon, 2009.

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Bloxam, Frances. Beau Beaver goes to town. Camden, Maine: Down East Books, 2008.

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The bully boys. Toronto: Puffin Canada, 2008.

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The bully boys. Toronto: Viking, 2000.

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The bully boys. Toronto: Puffin, 2012.

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R, Grol Lini. The Battle of Beaverdam: A historical drama in three acts. Guelph, Ont: Questex, 1997.

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Medin, Dean E. Small mammals of a beaver pond ecosystem and adjacent riparian habitat in Idaho. Ogden, UT: U.S. Dept. of Agriculture, Forest Service, Intermountain Research Station, 1991.

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Medin, Dean E. Small mammals of a beaver pond ecosystem and adjacent riparian habitat in Idaho. [Ogden, Utah]: U.S. Dept. of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station, 1991.

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Crook, Connie Brummel. Acts of courage: Laura Secord and the War of 1812. Toronto: Pajama Press, 2012.

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ill, Battuz Christine, ed. Five busy beavers. New York: Sky Pony, 2018.

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Book chapters on the topic "Beaver dams"

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Touchart, Laurent, János Józsa, László Rákóczi, Tamás Krámer, Thomas Andrén, Damien Bouffard, Leon Boegman, et al. "Beaver Dams and Ponds." In Encyclopedia of Lakes and Reservoirs, 110–13. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-1-4020-4410-6_52.

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Illés, Béla. "The Fairy Tale about the Bear, the Wolf and the Sly Fox (1925)." In Fairy Tales and Fables from Weimar Days, 181–89. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-69275-3_28.

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Foletti, Ivan, and Katarína Kravčíková. "Closed Doors as Bearers and Constructors of Images. Santa Sabina in Rome and Notre Dame du Puy." In The Notion of Liminality and the Medieval Sacred Space, 24–45. Brno, Czech Republic: Masarykova univerzita, 2020. http://dx.doi.org/10.1484/m.convisup-eb.5.131005.

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"The Ecology and Management of Wood in World Rivers." In The Ecology and Management of Wood in World Rivers, edited by MICHAEL M. POLLOCK, MORGAN HEIM, and DANIELLE WERNER. American Fisheries Society, 2003. http://dx.doi.org/10.47886/9781888569568.ch11.

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<em>Abstract.</em>—Beaver dams alter the hydrology and geomorphology of stream systems and affect habitat for fishes. Beaver dams measurably affect the rates of groundwater recharge and stream discharge, retain enough sediment to cause measurable changes in valley floor morphology, and generally enhance stream habitat quality for many fishes. Historically, beaver dams were numerous in small streams throughout most of the Northern Hemisphere. The cumulative loss of millions of beaver dams has dramatically affected the hydrology and sediment dynamics of stream systems. Assessing the cumulative hydrologic and geomorphic effects of depleting these millions of wood structures from small and medium-sized streams is urgently needed. This is particularly important in semiarid climates, where the widespread removal of beaver dams may have exacerbated effects of other land use changes, such as livestock grazing, to accelerate incision and the subsequent lowering of groundwater levels and drying of streams.
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"Chapter Five. Walking to Beaver Dams: Colonial Narratives, 1820s–1860s." In Heroines and History. Toronto: University of Toronto Press, 2002. http://dx.doi.org/10.3138/9781442675728-007.

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Wohl, Ellen. "The Beaver Meadow on North St. Vrain Creek." In Saving the Dammed. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190943523.003.0003.

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There is a place, about a mile long by a thousand feet wide, that lies in the heart of the Southern Rocky Mountains in Colorado. Here at the eastern margin of Rocky Mountain National Park, along a creek known as North St. Vrain, everything comes together to create a bead strung along the thread of the creek. The bead is a wider portion of the valley, a place where the rushing waters diffuse into a maze of channels and seep into the sediment flooring the valley. In summer the willows and river birch growing across the valley bottom glow a brighter hue of green among the darker conifers. In winter, subtle shades of orange and gold suffuse the bare willow stems protruding above the drifted snow. The bead holds a complex spatial mosaic composed of active stream channels; abandoned channels; newly built beaver dams bristling with gnawed-end pieces of wood; long-abandoned dams now covered with willows and grasses but still forming linear berms; ponds gradually filling with sediment in which sedges and rushes grow thickly; and narrow canals and holes hidden by tall grass: all of these reflect the activities of generations of beavers. This is a beaver meadow. The bead of the beaver meadow is partly hidden, tucked into a fold in this landscape of conifers and mountains. The approach is from Route 7, which runs north–south across the undulating topography of creeks flowing east toward the plains. Coming from the north, as I commonly do, you turn west into the North St. Vrain watershed on an unpaved road perched on a dry terrace above the creek. The road appears to be on the valley bottom, but beyond the terrace the valley floor drops another 20 feet or so to the level at which the creek flows. I instinctively pause at this drop-off. The conifer forest on the terrace is open and the walking is easy. The beaver meadow looks impenetrable and nearly is. I have to stoop, wade, crawl, wind, and bend my way through it, insinuating my body among the densely growing willow stems and thigh-high grasses.
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Wohl, Ellen. "October: Of Beavers and Humans." In Saving the Dammed. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190943523.003.0013.

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By mid-October, the first snow has fallen on the beaver meadow. There is no sign of snow when I visit a few days later, but the air feels chill in the shadows and a cool breeze leavens the sunshine’s warmth. Mostly, the beaver meadow seems a golden place. Many of the willow, aspen, and birch leaves have already fallen, but enough remain to create a glowing ménage of yellow, gold, palest orange, and tan. Each leaf refracts and filters the light so that it comes from every direction rather than only from above. Aspens on the north-facing valley slope stand bare and pale gray. Those on the south facing slope form bursts of gold among the dark green conifers. The beaver meadow remains lively with activity. Dance flies move upward and downward in a column of air backlit by sunshine, their delicate bodies shimmering in the low-angle light. A little black stonefly lands on the back of my hand. I resist the urge, bred by summer mosquitoes, to reflexively slap it away. As I cross smaller side channels, brook trout dart away from the warm shallows where they have been resting. The narrow band of white on each dorsal fin flashes as the fish moves swiftly toward deeper water. When one small trout gets momentarily stuck between two exposed cobbles, I cup its slender, wriggling body between my hands and help it along. Windrows of fallen leaves form swirling patterns on the water surface and streambed. Filamentous algae grow in thick green strands along the side channels, where lower water exposes wide bands of mud along the channel edges. The mud bands record the comings and goings along the channel: precise imprints of raccoon feet and deer hooves and blurrier outlines left by moose. Moose beds mat down the tall grasses scattered among the willow thickets. As usual, the beavers themselves elude me, but I see fresh mud and neatly peeled white branches with gnawed ends on some of the dams. Lower water in the beaver pond exposes an entrance hole in the side of the lodge.
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Wohl, Ellen. "August: Legacy Effects." In Saving the Dammed. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190943523.003.0011.

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Emily Dickinson wrote a lovely poem using a brook as a metaphor for one’s interior life. The poem includes the lines: . . . And later, in August it may be, When the meadows parching lie, Beware lest this little brook of life Some burning noon go dry! . . . No chance of the little brook going dry if it runs through a beaver meadow. The movement of water across and through the North St. Vrain beaver meadow has slowed perceptibly by August. Some of the secondary channels barely flow and the main channel is easily crossed on foot. The water remains high in the main beaver pond, but few of the small dams winding across the meadow have water spilling over them. My feet are less likely to sink into wet black muck as I wander through the meadow, and even the moose tracks leave less of an imprint in the drying soil. Plenty of water remains, however, and the meadow is a much brighter shade of green than the adjacent, drier hill slopes. Many flowers remain in bloom across the meadow. Stalks bristling with the elaborate, richly pink blossoms of elephant’s head rise above standing water. Dusky purple monkshood flowers in slightly drier soil, as do the showy blue and white columbines. The blue bell-shaped flowers of harebell mark the driest sites. The late-summer flowers are joined now by the spreading tan or scarlet caps of fungi, as well as green berries on the ground juniper and kinnikinnick growing on the drier terrace beside the beaver meadow. Songbirds born this summer are fully feathered and capable fliers, and some of the birds have already left the meadow for the year. Early morning temperatures carry a hint of the coming autumn. The beaver kits grow steadily more capable, too, and by now they are used to foraging on their own. Presumably, this frees the breeding adult female for more time spent in dam and lodge repair or starting the food cache for the coming winter.
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Wohl, Ellen. "January: Of Rocks and Ice." In Saving the Dammed. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190943523.003.0004.

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The beaver meadow is quiet in January. For many plants and animals, winter is a season of subdued activity, or of waiting. North St. Vrain Creek remains open along the main channel, the water flowing clear but tinted brown as pine bark between snowy banks. Densely growing thickets of willow closely line the banks. Each stem starts pale brown near the ground, then grades upward to shades of maroon or yellowish orange at the branch tips. In a bird’s-eye view, these startling colors make the meadow stand out distinctly from the dark green conifers that define the edges of the meadow. Spruce and fir trees grow sharply pointed as arrows; pines present a slightly more rounded outline. Snow falls silently in thick flakes from the low, gray sky. The upper edges of the valley walls fade into snow and clouds. The sun appears briefly as a small, pale spotlight behind the clouds to the south. Snow mounds on the patches of ice in the shallow channel. The water flowing beneath creates flickers through the translucent ice like a winter fire of subdued colors and no heat. Tussocks form humps of straw-colored grass above the dark, frozen soil. Rabbit tracks line the snowy bank, sets of four paw marks with a large gap between each set. Something small crossed the bank, leaping one to two feet at a bound, two paws with slight drag marks behind them. In places the powdery snow has drifted deeply, but mostly it is shallow over a frozen crust. Beaver-gnawed sticks and stumps poke up through the snow. A large flood came through four months ago, in mid-September, washing out dams that the beavers have not yet rebuilt. Chunks of wood deposited among the willow stems by the floodwaters stand far above the January flow of the creek. A dipper fishes the creek, wading rather than swimming, at home in the cold water. The slate-gray bird is the only visible animal, busily probing the bed with its short bill, then pausing to stand and bob up and down.
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Rosell, Frank, and Róisín Campbell-Palmer. "Habitat use and constructions." In Beavers, 103–39. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780198835042.003.0004.

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This chapter describes beaver habitat selection and modification activities. It discusses their unusual ability to modify environments to suit their needs, including lodge and dam construction, location selection for these structures, and alteration of vegetation. Historically beavers have been described as a forest species. Whilst beavers may preferentially select wooded freshwater habitats, particularly in more northern landscapes, they are capable of successfully establishing in widely varying terrain, including mountainous, brackish, tundra, cultivated, and urban landscapes. Beavers occupy a wide range of freshwater bodies (ponds, streams, rivers, marshes, and lakes) but will also travel through brackish and saltwater bodies during dispersal. Beavers prefer still or slow-moving water with stable water levels of at least 0.6–1.0 m in depth, but they are highly adaptable and can modify many types of natural, cultivated, and artificial habitats. When preferred habitats are unavailable or already occupied by other beavers, they will select narrower watercourses and construct complex dam structures to create preferred/suitable habitats. In the process of engineering their habitat, beavers create trails and canals to access forage. They harvest saplings, shrubs, and trees, which they consume and use to fill their food caches for the northern winter.
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Conference papers on the topic "Beaver dams"

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RAŠKAUSKAITĖ, Monika, and Kastytis ŠIMKEVIČIUS. "EURASIAN BEAVER (CASTOR FIBER L.) POPULATION IN ASU SCIENCE AND TEACHING HUNTING AREA AND BEAVER DAMS REBUILD INTENSITY." In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.171.

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Eurasian Beaver (Castor fiber L.) was reintroduced in Lithuania on 1947. Population growth was quite rapid ant there were about 6000 beavers on 1970. Nowadays beavers population in Lithuania is about 40 000. Beavers have a possibility to affect the environment where they live by building dams, lodges, making burrows systems, changing water level. Because of being such an active environmental former beaver has a huge indirect impact for forest and agricultural fields – higher water level usually causes damage for forest trees or crops. There are different studies about this beaver’s ability to change environment and to build dams, lodges. Explanations why it is needed for this species now is clear, but still there are question how can these animal plan, organize and improve their ability to build. The aim of this research is to find out if dams rebuilt activity intensity differs during different year seasons and is it affected by the beaver’s family size in current place. According to our findings, the beginning of dam rebuilt and total dam rebuild depends on year season – on fall season it takes 4 times less time. In addition to this, family size has an effect – bigger families rebuilt dams faster. Usually beavers do this job from midnight to 2 a.m. on fall season.
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Müller, G., and J. Watling. "The engineering in beaver dams." In The International Conference On Fluvial Hydraulics (River Flow 2016). Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315644479-326.

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Rupiper, Andrew, William J. Beck, Tyler Groh, Tom Isenhart, Keith E. Schilling, and Peter Moore. "DAM! IMPACTS OF BEAVER DAMS ON SURFACE AND GROUNDWATER QUALITY." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-378125.

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MÜLLER, GERALD, and LAURA MCFADZEAN. "ARTIFICIAL BEAVER DAMS FOR SUSTAINABLE WATER MANAGEMENT AND RIVER RESTORATION." In 38th IAHR World Congress. The International Association for Hydro-Environment Engineering and Research (IAHR), 2019. http://dx.doi.org/10.3850/38wc092019-0580.

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Burchsted, D., M. D. Daniels, and R. M. Thorson. "Restoring the River Discontinuum: Looking at the Example of Beaver Dams." In World Environmental and Water Resources Congress 2010. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41114(371)188.

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McCullough, M. C., D. E. Eisenhauer, M. G. Dosskey, and D. M. Admiraal. "Hydraulic Characteristics and Dynamics of Beaver Dams in a Midwestern U.S. Agricultural Watershed." In World Environmental and Water Resources Congress 2006. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40856(200)182.

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Behar, Hannah, Emma Burgeson, Karen Gran, Salli F. Dymond, Rebecca Teasley, and John Swenson. "STREAM THERMAL DYNAMICS: THE INFLUENCE OF BEAVER DAMS IN A NORTHERN MINNESOTA WATERSHED." In 54th Annual GSA North-Central Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020nc-348290.

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Fallon, Andrew R., William B. Ouimet, and Tianhua Wang. "20TH CENTURY RECOVERY OF BEAVER DAMS, FLOODPLAIN CONNECTIVITY AND WETLAND HABITAT IN CONNECTICUT STREAMS." In Joint 69th Annual Southeastern / 55th Annual Northeastern GSA Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020se-345045.

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Nazzaro, Alexandra, Sara Mitchell, Hannah Behar, Emma Burgeson, Josh Dumke, Salli F. Dymond, Karen Gran, and Rebecca Teasley. "IMPACT OF BEAVER DAMS ON STREAM TEMPERATURE IN THE KNIFE RIVER WATERSHED, MINNESOTA USA." In Joint 55th Annual North-Central / 55th Annual South-Central Section Meeting - 2021. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021nc-362695.

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Arauz, Isabela, Kristen E. Cognac, and Michael J. Ronayne. "INFLUENCE OF NATURAL BEAVER DAMS ON GROUNDWATER RECHARGE DYNAMICS IN A STREAM-ALLUVIAL-BEDROCK AQUIFER SYSTEM." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-381778.

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Reports on the topic "Beaver dams"

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Taylor, Jimmy D., Greg K. Yarrow, and James E. Miller. Beavers. U.S. Department of Agriculture, Animal and Plant Health Inspection Service, March 2017. http://dx.doi.org/10.32747/2017.7207729.ws.

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The American beaver (Castor canadensis) is known as an “ecosystem engineer” because of the benefits their dams provide to biological diversity and ecosystem function. It also is considered a “keystone species” because of its ability to transform its environment, creating new habitats upon which other species depend. Despite the many positive benefits beavers provide through foraging and dam building, beavers also create conflict with people when their activities cause damage. The focus of this publication is to provide basic information on beaver ecology, damage, and management.
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Wohl, Ellen, Daniel N. Scott, and Steven E. Yochum. Managing for large wood and beaver dams in stream corridors. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, 2019. http://dx.doi.org/10.2737/rmrs-gtr-404.

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Wohl, Ellen, Daniel N. Scott, and Steven E. Yochum. Managing for large wood and beaver dams in stream corridors. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, 2019. http://dx.doi.org/10.2737/rmrs-gtr-404.

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Poor, Erin. Effects of Beaver Dams on Urban Stream Hydraulic Response During Storm Events. Portland State University, April 2018. http://dx.doi.org/10.15760/mem.8.

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Davee, Rachael, Susan Charnley, and Hannah Gosnell. Silvies Valley Ranch, OR: using artificial beaver dams to restore incised streams. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 2017. http://dx.doi.org/10.2737/pnw-rn-577.

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Davee, Rachael, Susan Charnley, and Hannah Gosnell. Silvies Valley Ranch, OR: using artificial beaver dams to restore incised streams. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 2017. http://dx.doi.org/10.2737/pnw-rn-577.

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Charnley, Susan. Beavers, landowners, and watershed restoration: experimenting with beaver dam analogues in the Scott River basin, California. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 2018. http://dx.doi.org/10.2737/pnw-rp-613.

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Charnley, Susan. Beavers, landowners, and watershed restoration: experimenting with beaver dam analogues in the Scott River basin, California. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 2018. http://dx.doi.org/10.2737/pnw-rp-613.

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Russell, H. A. J., D. I. Cummings, and D. Ponomarenko. Geomorphic impact of a beaver dam outbreak flood, Gatineau Hills, Quebec: a pictorial record. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2009. http://dx.doi.org/10.4095/226533.

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Killeen, P. G., B. E. Elliott, and C. N. Aoki. Borehole geophysical logs in Meguma gold occurrences, Nova Scotia (Beaver Dam, Moose River and Lake Charlotte areas). Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1998. http://dx.doi.org/10.4095/209376.

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