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Journal articles on the topic 'River habitat survey'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 April 2022

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1

Kiraga, Marta, and Zbigniew Popek. "Using the River Habitat Survey method in forecasting effects of river restoration." Annals of Warsaw University of Life Sciences, Land Reclamation 46, no. 2 (December 1, 2014): 125–38. http://dx.doi.org/10.2478/sggw-2014-0011.

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Abstract Using the River Habitat Survey method in forecasting effects of river restoration. Research presents usability of the River Habitat Survey (RHS) evaluation method in forecasting effects of the Zielawa River restoration, performed in selected section between 18 + 960 km and 19 + 460 km. The EU so-called Water Framework Directive signalizes necessity of achieving a good ecological status of European rivers in the immediate future. Accordingly, river restoration is the main tool for already technically regulated rivers’ quality upgrading. Present research contains a collation of four proposed restoration works variants and the ecological evaluation of chosen river reach before and after initiating restoration works in accordance to various variants, using the RHS method. The conclusion is fact, that in dependence of established variant it is possible to receive improvement of ecological class from present Class V to Class IV (variants 1 and 2) or Class III (variants 3 and 4)
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2

Milanovic, Ana, Marko Urosev, and Dragana Milijasevic. "Use of the RHS method in Golijska Moravica river basin." Glasnik Srpskog geografskog drustva 86, no. 2 (2006): 53–61. http://dx.doi.org/10.2298/gsgd0602053m.

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River Habitat Survey (RHS) is terrain method developed in UK in 1994. for determination of physical character of rivers and river basin. This method is applied for the first time in Golijska Moravica river basin. Two indices which broadly describe the diversity of river habitat and landscape features (Habitat Quality Assessment (HQA)) and extent and severity of artificial modification to the channel (Habitat Modification Class (HMC)) has been developed for reporting purposes. These are based on simple scoring systems which have been agreed by technical experts.
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3

Raven, P. J., N. T. H. Holmes, F. H. Dawson, and M. Everard. "Quality assessment using River Habitat Survey data." Aquatic Conservation: Marine and Freshwater Ecosystems 8, no. 4 (July 1998): 477–99. http://dx.doi.org/10.1002/(sici)1099-0755(199807/08)8:4<477::aid-aqc299>3.0.co;2-k.

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4

Gu, Jung-Eun, Sang Hwa Jung, Joongu Kang, and Hyoseop Woo. "Analysis for Underwater Sound on Natural River Habitat." E3S Web of Conferences 40 (2018): 02047. http://dx.doi.org/10.1051/e3sconf/20184002047.

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A riffle-pool structure is a representative physical structure of bed in rivers. The change in the physical parameter of the habitat could lead to changes in the sound environment of rivers, which are expressed by underwater acoustics. This change in underwater sound affects fish habitat. In this study, the changes of underwater acoustics were analyzed according to the change of pool-riffle sequence in a natural river. And the correlation between underwater acoustics and hydraulic characteristics was investigated. The survey for underwater acoustics was performed in the Namdae stream where is in Gangwon province. This stream belongs to the Han River basin and the river length is 39.01 km and the catchment area is 127.56 km2. The Namdae stream is a river that accounts for more than 70% of salmon returning to South Korea. The spawning salmon will return to this area around November after growing in the Bering Sea. It is important to manage the fish habitat in this river so there is a lot of research on the enhancement of fish habitat. Hydraulic characteristics were changed by the river bed structure. In this study, we investigated the relationship between underwater acoustic characteristics and hydraulic factors such as riverbed material, flow rate and water depth of each habitat type at 12 sites. The characteristics of underwater acoustic differed relative to different hydraulic factors of the two habitats, which is riffle and pool. The sound pressure level of riffles was relatively higher than that of the pools due to bed materials, shallow depth and high water velocity of riffles. In the future, it is considered that the underwater sound can be utilized as a parameter to evaluate the physical habitat environment of the river.
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5

Hilling, Corbin D., Jason L. Fischer, Jason Ross, Taaja R. Tucker, Robin L. DeBruyne, Christine M. Mayer, and Edward F. Roseman. "Nearshore Fish Species Richness and Species–Habitat Associations in the St. Clair–Detroit River System." Water 13, no. 12 (June 8, 2021): 1616. http://dx.doi.org/10.3390/w13121616.

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Shallow water riparian zones of large rivers provide important habitat for fishes, but anthropogenic influences have reduced the availability and quality of these habitats. In the St. Clair–Detroit River System, a Laurentian Great Lakes connecting channel, losses of riparian habitat contributed to impairment of fish populations and their habitats. We conducted a seine survey annually from 2013 to 2019 at ten sites in the St. Clair and Detroit rivers to assess riparian fish communities, and to identify habitat attributes associated with fish species richness and catches of common species. We captured a total of 38,451 fish representing 60 species, with emerald shiner Notropis atherinoides composing the largest portion of the catch. We used an information-theoretic approach to assess the associations between species richness and catches of 33 species with habitat variables (substrate, shoreline vegetation types, and aquatic macrophyte richness). Sand, cobble, and algal substrates and shoreline vegetation were important predictors of species richness based on a multimodel inference approach. However, habitat associations of individual species varied. This work identified manageable habitat variables associated with species richness, while identifying potential tradeoffs for individual species. Further, this work provides baselines for development and evaluation of fish community and shoreline habitat restoration goals.
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6

Naura, Marc, Mike J. Clark, David A. Sear, Peter M. Atkinson, Duncan D. Hornby, Paul Kemp, Judy England, Graeme Peirson, Chris Bromley, and Matthew G. Carter. "Mapping habitat indices across river networks using spatial statistical modelling of River Habitat Survey data." Ecological Indicators 66 (July 2016): 20–29. http://dx.doi.org/10.1016/j.ecolind.2016.01.019.

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7

Costa, Francisco, and António Vieira. "Decision Support Tools for River Restoration: The Implementation of the “River Habitat Survey” Methodology on the River Selho (Guimarães Municipality, Northwest Portugal)." Hydrology 8, no. 2 (April 21, 2021): 69. http://dx.doi.org/10.3390/hydrology8020069.

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The river habitat survey (RHS) system is a method used to assess the physical features and quality of rivers, which was developed to assist in the conservation and recovery of riverside habitats. The RHS takes into account the need to characterize areas of intervention from a hydromorphological point of view, in order to introduce corrective measures aimed at restoring degraded sections and habitats, and increasing local biodiversity. In this paper, we present the results obtained from the application of the RHS methodology to the River Selho, in the municipality of Guimarães (Portugal). The transects that we defined were strongly influenced by anthropic actions that have modified the riverside habitats, the artificialization of the river channel, and the urban occupation of the banks. Taking into account the results, we can point out the main problems that currently affect the hydromorphological quality of the transects analyzed in the River Selho, as well as identify the originating factors: the excessive silting of the watercourse; morphometric changes, with an emphasis on the narrowing and modification of the channel and the banks; as well as the massive destruction of the riparian zone. This study shows that the application of the RHS methodology is a useful tool for the management of degraded riverside areas.
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8

Cortes, Rui Manuel Vitor, Simone Varandas, Samantha Jane Hughes, and Maria Teresa Ferreira. "Combining habitat and biological characterization: Ecological validation of the river habitat survey." Limnetica 27, no. 1 (June 15, 2008): 39–56. http://dx.doi.org/10.23818/limn.27.04.

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9

Spieczyński, Damian, Małgorzata Raczyńska, Anna Grzeszczyk-Kowalska, Mariusz Raczyński, and Małgorzata Zimnicka-Pluskota. "THE APPLICATION OF THE RIVER HABITAT SURVEY METHOD TO THE ASSESSMENT OF THE QUALITY OF THE RIVER WARDYNKA (NORTH-WESTERN POLAND)." Inżynieria Ekologiczna 35 (2013): 85–94. http://dx.doi.org/10.12912/23920629/310.

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10

Kaeser, Adam J., Reuben Smit, and Michael Gangloff. "Mapping and Modeling the Distribution, Abundance, and Habitat Associations of the Endangered Fat Threeridge in the Apalachicola River System." Journal of Fish and Wildlife Management 10, no. 2 (September 1, 2019): 653–75. http://dx.doi.org/10.3996/032019-jfwm-021.

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Abstract Large, Coastal Plain rivers of the southeastern United States contain some of the most diverse freshwater communities in North America; however, surveying the fauna of these large rivers presents numerous logistical and statistical challenges. We assessed the contemporary distribution, abundance, and habitat associations of the endangered fat threeridge mussel Amblema neislerii throughout the Apalachicola River system in northwestern Florida. To achieve this goal, we used side scan sonar to map the distribution of mesohabitats and conducted a system-wide, quantitative survey to define mussel habitat associations. We then used habitat and mussel data to develop predictive models of spatial distribution and to estimate the abundance of fat threeridge across the entire Apalachicola River system. Findings revealed a broadly distributed (i.e., 128 river kilometers occupied), robust population of approximately 9 million individuals (95% CI = 5–12 million), with a center of distribution (i.e., where abundance and occurrence were highest) approximately 45–80 river kilometers upstream of the river mouth. Fat threeridge primarily occupy fine sediment mesohabitats characterized by smooth/plane bedforms that are clearly definable via sonar habitat mapping. We hypothesize that this species may be particularly sensitive to the availability of stable, fine sediments during one or more critical life history phases and that the availability of this habitat may explain its restricted distribution in tributary rivers. Our study provides a quantitative, replicable foundation upon which future population and habitat monitoring can be based.
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11

Urosev, Marko, Ana Milanovic, and Dragana Milijasevic. "Assessment of the river habitat quality in undeveloped areas of Serbia applying the RHS (river habitat survey) method." Journal of the Geographical Institute Jovan Cviji?, SASA 59, no. 2 (2009): 37–58. http://dx.doi.org/10.2298/ijgi0902037u.

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12

Harvey, Gemma L., and Nicholas P. Wallerstein. "Exploring the interactions between flood defence maintenance works and river habitats: the use of River Habitat Survey data." Aquatic Conservation: Marine and Freshwater Ecosystems 19, no. 6 (September 2009): 689–702. http://dx.doi.org/10.1002/aqc.1033.

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13

Dhakal, Devendra. "Fish and Fish Fauna in Narayani River – A Pictorial Survey." BMC Journal of Scientific Research 2, no. 1 (December 1, 2018): 15–22. http://dx.doi.org/10.3126/bmcjsr.v2i1.42727.

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The Narayani is the most important typical tropical river of Nepal. It has seven tributaries called the Saptagandaki and drains central Nepal between Langtang and Dhaulagiri himal. The Narayani river drains the edge of Chitwan National Park for down the Trivenighat section of narayani. The temperature of water at river was found ranging between 10.3-27.5°C. The maximum temperature was recorded at station Golaghat, the junction of Narayani and Rapti river in summer and lowest temperature of station was at Benighat, the junction between Trisuli and Budigandaki in winter season. Gandaki river system was found to be the best habitat for fresh water fishes due to its diverse habitat and ecotype. A total of 86 species were recorded from Narayani and Rapti river which belong to 18 family and 46 genera. Economically important fishes found are Tor tor, Tor putitara, Labeo agra, Labeo dero, Wallago attu, Bagarius bagarius, Anguilla bengalensis etc. During the study Tor tor, endangered species and some other nationally threatened species were also recorded from Gandaki river system.
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14

St-Georges, Mario, Simon Nadeau, Daniel Lambert, and Robert Décarie. "Winter habitat use by ptarmigan, snowshoe hares, red foxes, and river otters in the boreal forest – tundra transition zone of western Quebec." Canadian Journal of Zoology 73, no. 4 (April 1, 1995): 755–64. http://dx.doi.org/10.1139/z95-089.

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We investigated species–habitat relationships of the midsized fauna inhabiting the transition zone between the boreal forest and forest tundra of subarctic Quebec. Data were collected during a winter aerial track survey of 46 randomly selected 25-km2 plots. The presence of species tracks and habitat variables were recorded for each 1-km section of riparian edge habitat within a plot. Sections of non-riparian habitat were also surveyed. Logistic regression was used to construct habitat models for ptarmigan (Lagopus spp.), snowshoe hares (Lepus americanus), red foxes (Vulpes vulpes), and river otters (Lutra canadensis). Species' habitat type selection was studied by comparing use and availability. Kendall's correlation coefficients were computed to analyze interrelations between variables. Significant logistic regressions were obtained for each species. The index of rank correlation between the observed responses and predicted probabilities for all pairs of observations ranged from 0.67 for ptarmigan to 0.84 for river otters. Species abundance was negatively associated with latitude except for that of snowshoe hare, which showed a stronger negative link with open habitat. For all species, distribution was not proportional to the frequency of occurrence of habitat types. Non-riparian habitat was either avoided or not significantly preferred by all species. Herbivorous species and river otter selected edge habitats along watercourses. Our study suggests that differences presented by the forest tundra and boreal forest are of importance for wildlife.
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15

Hastie, L. C., S. L. Cooksley, F. Scougall, M. R. Young, P. J. Boon, and M. J. Gaywood. "Characterization of freshwater pearl mussel (Margaritifera margaritifera) riverine habitat using River Habitat Survey data." Aquatic Conservation: Marine and Freshwater Ecosystems 13, no. 3 (2003): 213–24. http://dx.doi.org/10.1002/aqc.560.

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16

Hawley, D., P. J. Raven, K. L. Anstey, S. Crisp, D. Freeman, and J. Cullis. "Riverside Explorer: an educational application of River Habitat Survey Information." Aquatic Conservation: Marine and Freshwater Ecosystems 12, no. 4 (2002): 457–69. http://dx.doi.org/10.1002/aqc.537.

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17

Kujanová, Kateřina, and Milada Matoušková. "Improvement in physical river habitat quality in response to river restoration measures." Geografie 121, no. 1 (2016): 54–78. http://dx.doi.org/10.37040/geografie2016121010054.

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The main goal of this paper is to verify the hypothesis that application of appropriate restoration measures can lead to an improvement in river habitat quality and to achieve good hydromorphological conditions within the ecological status under the Water Framework Directive 2000/60/ES. The study includes an analysis of river network modifications founded on comparing historical and present-day maps, a determination of regional hydromorphological reference conditions based on a field survey and measurements, an assessment of hydromorphological quality of the studied water body and a proposal of appropriate restoration measures. The effects on improvement in hydromorphological status were predicted on the basis of a simulation of hydromorphological conditions after the application of proposed restoration measures. Overall, at least a good hydromorphological status would be achieved. The study proved that it is essential to carry out a hydromorphological survey including a determination of reference conditions as it provides some outputs necessary for a proposal and application of efficient restoration.
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18

Heasley, Eleanore L., James D. A. Millington, Nicholas J. Clifford, and Michael A. Chadwick. "A Waterbody Typology Derived from Catchment Controls Using Self-Organising Maps." Water 12, no. 1 (December 24, 2019): 78. http://dx.doi.org/10.3390/w12010078.

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Multiple catchment controls contribute to the geomorphic functioning of river systems at the reach-level, yet only a limited number are usually considered by river scientists and managers. This study uses multiple morphometric, geological, climatic and anthropogenic catchment characteristics to produce a single national typology of catchment controls in England and Wales. Self-organising maps, a machine learning technique, are used to reduce the complexity of the GIS-derived characteristics to classify 4485 Water Framework Directive waterbodies into seven types. The waterbody typology is mapped across England and Wales, primarily reflecting an upland to lowland gradient in catchment controls and secondarily reflecting the heterogeneity of the catchment landscape. The seven waterbody types are evaluated using reach-level physical habitat indices (including measures of sediment size, flow, channel modification and diversity) extracted from River Habitat Survey data. Significant differences are found between each of the waterbody types for most habitat indices suggesting that the GIS-derived typology has functional application for reach-level habitats. This waterbody typology derived from catchment controls is a valuable tool for understanding catchment influences on physical habitats. It should prove useful for rapid assessment of catchment controls for river management, especially where regulatory compliance is based on reach-level monitoring.
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19

Baird, Ian G., and Isabel L. Beasley. "Irrawaddy dolphin Orcaella brevirostris in the Cambodian Mekong River: an initial survey." Oryx 39, no. 3 (July 2005): 301–10. http://dx.doi.org/10.1017/s003060530500089x.

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Irrawaddy dolphins Orcaella brevirostiris are found in coastal waters from the Bay of Bengal east to Palawan, Philippines and south to northern Australia. They also occur in three large tropical river systems in South-east Asia: the Mekong, Mahakam and Ayeyarwady. In March and May 1997 approximately 350 km of riverine habitat in parts of north-east Cambodia were surveyed, discussions took place with local people, and reported dry season dolphin habitat was mapped. Our objectives were to investigate the status, habitat and distribution of dolphins in north-east Cambodia and identify threats to the continued survival of dolphins in the Mekong River Basin. Nine groups of dolphins were observed in the Mekong River. A ‘best’ estimate of 40 animals were seen. Irrawaddy dolphins were generally confined to sections of the river with water levels >8–10 m during the dry season. It appears that the Mekong River dolphin population is rapidly declining. In 1997 there were probably no more than 100¨C150 dolphins left in north-east Cambodia (including southern Laos) and no more than 200 within the entire Mekong River Basin, although these numbers remain tentative. Anthropogenic mortality is high, albeit largely unintentional, and there is considerable risk that the dolphin population will become locally extinct in the Mekong River in the near future. The establishment of community-managed deep water Fish Conservation Zones with government support may represent the best opportunity for reducing dry season dolphin mortality from large-meshed gillnet entanglement. Efforts to establish protected areas for dolphins are currently underway.
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20

Jeffers, J. N. R. "The statistical basis of sampling strategies for rivers: an example using river habitat survey." Aquatic Conservation: Marine and Freshwater Ecosystems 8, no. 4 (July 1998): 447–54. http://dx.doi.org/10.1002/(sici)1099-0755(199807/08)8:4<447::aid-aqc288>3.0.co;2-r.

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21

Raven, Paul J., Nigel T. H. Holmes, Ian P. Vaughan, F. Hugh Dawson, and Peter Scarlett. "Benchmarking habitat quality: observations using River Habitat Survey on near-natural streams and rivers in northern and western Europe." Aquatic Conservation: Marine and Freshwater Ecosystems 20, S1 (April 7, 2010): S13—S30. http://dx.doi.org/10.1002/aqc.1103.

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22

Shah, Deep Narayan, Amit Poudyal, Gopal Sharma, Sarah Levine, Naresh Subedi, and Maheshwor Dhakal. "Status, distribution, threats, and conservation of the Ganges River Dolphin Platanista gangetica (Mammalia: Artiodactyla: Cetacea) in Nepal." Journal of Threatened Taxa 12, no. 1 (January 26, 2020): 15106–13. http://dx.doi.org/10.11609/jott.4397.12.1.15106-15113.

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The Ganges River Dolphin Platanista gangetica has been classified as Endangered in the IUCN Red List of Threatened Species. The IUCN changed its status from ‘Vulnerable’ to ‘Endangered’ in 1996 as the species population was declining in its entire distribution range. It is, however, classified as ‘Critically Endangered’ in Nepal. Historically, the freshwater cetacean has been documented in the Karnali, Koshi, Narayani, and Mahakali basins. With their population and distribution range in decline, the Ganges River Dolphin (GRD) is no longer found in the Mahakali River system, which demarcates and traverses the Western border of India and Nepal. This study examines the status and distribution of the GRD in the river systems of Nepal during the monsoon of 2016. The national dolphin population survey was conducted in the three largest river basins in Nepal—Karnali, Narayani, and Koshi. Each of the three basins represent the extreme upstream limit of the GRD distribution in Ganges River basin. The national population survey included both a boat-based survey and shore-based synchronized counting in each of the three river systems. Fifty-two (Best-High-Low: 52-61-50) dolphins were counted during the entire nationwide survey, conducted in July–August, 2016. Researchers gathered social-data from locals residing alongside the observed basin, giving priority to artisanal fishers and those subsisting to some degree from the rivers known to host the river dolphin. A questionnaire survey of ninety-two residents from riparian villages adjacent to the GRD hotspots sheds light on the local perspectives towards dolphin conservation coupled with an assessment of their socio-economic status; artisanal fishing practices; and their awareness of dolphin conservation. According to the survey, notable threats to dolphin conservation are prey depletion; non-availability of suitable habitat; habitat fragmentation and a low level of awareness. Based on the counting outcomes and social survey, recommendations have been put forward for the conservation of this species.
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Wilkinson, J., J. Martin, P. J. Boon, and N. T. H. Holmes. "Convergence of field survey protocols for SERCON (System for Evaluating Rivers for Conservation) and RHS (River Habitat Survey)." Aquatic Conservation: Marine and Freshwater Ecosystems 8, no. 4 (July 1998): 579–96. http://dx.doi.org/10.1002/(sici)1099-0755(199807/08)8:4<579::aid-aqc300>3.0.co;2-7.

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24

Meulenbroek, Paul, Urban Hammerschmied, Stefan Schmutz, Steven Weiss, Michael Schabuss, Horst Zornig, Spase Shumka, and Friedrich Schiemer. "Conservation Requirements of European Eel (Anquilla anquilla) in a Balkan Catchment." Sustainability 12, no. 20 (October 15, 2020): 8535. http://dx.doi.org/10.3390/su12208535.

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The European eel (Anquilla anquilla) has been declining throughout its area of distribution, is addressed in several pieces of legislation, and is the target of extensive restoration efforts. Therefore, investigating and conserving natural eel habitats is urgently needed. Large, near-natural rivers have become rare in Europe but the Balkans host some of the extant examples. However, several Balkan rivers–among them the transboundary river Vjosa/Aoos of Albania and Greece–are under threat from planned hydropower constructions. This study synthesizes European eel catch data from four institutions and the results of a recent electrofishing survey. Population density and structure as well as habitat choice were studied at different spatial scales. We calculated densities for each meso-habitat (0–1303 ind./ha) and extrapolated these values across three different hydromorphological channel sections (meandering: 70 ind./ha, braided: 131 ind./ha, constrained: 334 ind./ha), resulting in an overall mean density of 168 ind./ha. Proposed hydropower plants would cut off about 80% of the catchment currently accessible and impact river sections downstream of the dams by disturbing hydrological dynamics. By linking study results to relevant legislation and literature we provide evidence-based data for water management decisions. We call for the Vjosa/Aoos to be protected in order to secure its outstanding conservation value.
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Radulovic, Snezana, Dusanka Laketic, and Dragana Vukov. "A riverside tale: Assessment of altered habitat effects on macrophyte assemblage on the river Tamis, Serbia." Archives of Biological Sciences 62, no. 4 (2010): 1163–74. http://dx.doi.org/10.2298/abs1004163r.

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The aim of this study was to recognize the relationships between the physical characteristics of river reaches and the supported macrophyte assemblage, using the newly developed RHS (River Habitat Survey) method and dataset, and to test the following specific hypotheses: (i) whether there are correlations between the abundance of macrophyte groups and the physical environment variables, and (ii) whether these relationships vary between macrophyte groups with different morphology types. The Tamis river possesses a highly diverse habitat potential, while high values of HMS capture obviously to significantly modified habitat classes, significantly distinguishing the R1 and L1 spot-check as a hot spot along the area studied.
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Wibowo, Arif, Mas Tri Djoko Sunarno, and Safran Makmur. "PARAMETER FISIKA, KIMIA, DAN BIOLOGI PENCIRI HABITAT IKAN BELIDA (Chitala lopis)." Jurnal Penelitian Perikanan Indonesia 15, no. 1 (February 1, 2017): 13. http://dx.doi.org/10.15578/jppi.15.1.2009.13-21.

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Penelitian mengenai parameter fisika, kimia, dan biologi penciri habitat ikan belida (Chitala lopis) dilakukan tahun 2005 - 2006 di perairan umum daratan di Sumatera, Kalimantan, dan Jawa. Tujuan nya adalah untuk mendapatkan informasi parameter lingkungan yang menjadi karakteristik habitat ikan belida dari berbagai badan air di Jawa, Sumatera, dan Kalimantan. Metode survei dan kegiatan laboratorium digunakan dalam penelitian ini. Parameter lingkungan yang diamati meliputi suhu udara, suhu air, Total Dissolved Solid (TDS), Daya Hantar Listrik (DHL), klorofil-a, kecepatan arus, Biological Oxygen Demand (BOD), oksigen terlarut, pH, alkalinitas, CO2 bebas, kedalaman air, dan kecerahan pada 116 lokasi pengambilan yang ditentukan secara sengaja di Sungai Tulang Bawang (Provinsi Lampung), Sungai Kampar, Sungai Siak (Provinsi Riau), Sungai Musi (Provinsi Sumatera Selatan), Sungai Citarum (Provinsi Jawa Barat), Sungai Kapuas (Provinsi Kalimantan Barat), dan Waduk Riam Kanan (Provinsi Kalimantan Selatan). Analisis data menggunakan pendekatan analisis multivariabel regresi berganda Metode Backward yang didasarkan pada Analisis Komponen Utama (Principal Component Analysis) dan pembeda (Discriminant Analysis), serta korespondensi analisis (correspondency analysis). Hasil penelitian menunjukkan habitat ikan belida dapat dibedakan menjadi tiga tipe, yaitu tipe yang menyerupai sungai utama, waduk, dan anak sungai. Pembeda utama sekaligus parameter lingkungan utama adalah parameter TDS yang paling besar, dan selanjutnya parameterparameter DHL, suhu udara, klorofil-a, kecepatan arus, BOD, Oksigen terlarut, pH, alkalinitas, dan CO2 bebas menyumbang yang paling sedikit. Kehadiran plankton genus Ulothrix dan Mytilina secara tidak langsung teridentifikasi sebagai penciri habitat spesifik ikan belida. Research on physical, chemical, and biological parameters indicating specific habitat of clown knife fish (Chitala lopis) was carried out at 2005 - 2006 in inlands waters of Sumatera, Borneo, and Java. This study purposed to obtain information of environmental parameters indicating habitat characteristic of the knife fish in various inland waters bodies in Sumatera, Borneo, and Java. Survey method and laboratory activities were employed in this research. Environmental parameters observed were air temperature, water temperature, Total Dissolved Solid (TDS), conductivity, water velocity, Biological Oxygen Demand (BOD), dissolved oxygen, pH, alkalinity, free C02, water depth, and water transparancy taken on 116 sampling stations distributing in Tulang Bawang River (Lampung Province), Kampar and Siak River (Riau Province), Musi River (South Sumatera Province), Kapuas River (West Kalimantan Province), Riam Kanan Reservoar (South Kalimantan Province), and Citarum River (West Java Province). Data analysis used multivariate approach of multiple regression of Backward Method such as Principal Component Analysis, Discriminant Analysis, and Corre spondency Analysis. The results showed that the clown knife fish habitats could be divided by three types of specific habitat, namely water bodies similar with main rivers, reservoir, and tributaries. Parameter of TDS indicated the primary differentization as well as habitat characteristics of the clown knife fish.Whilst the parameters of conductivity, air temperature, chlorophyill-a, water current, BOD, dissolved oxygen, pH, alcalinity, and free CO2 contributed less significance. The existence of plankton from genus Ulothrix and Mytilina was identified indirectly as the specific habitat of the clown knife fish.
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Komariah, Imas, and Toru Matsumoto. "DECISION MAKING ANDCONSCIOUSNESS OF STAKEHOLDERS FOR RIVER IN INDONESIA." Journal of Sustainable Development Education and Research 1, no. 1 (May 19, 2017): 23. http://dx.doi.org/10.17509/jsder.v1i1.6240.

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River restoration in Indonesia is very important to be implemented because the river quality has been degraded. This action aims to improve the quality and function of rivers. Actual action has been done for landscape function. Several river restoration alternatives namely, river restoration species, river restoration ecosystem/landscape, and river restoration of ecosystem services (flood control, raw water, and hydropower plants). This research was done with questionnaire survey which are distributed to experts. The proposed research consists of Analytical Hierarchy Process (AHP) with five criteria’s, they are: river water, habitat, cost, landscape, and action. Based on these result several important sub criteria were water quality, water quantity, water use, water usage, biodiversity, species, population, agriculture, and public education. The result showed that the river restoration of ecosystem services (flood control, raw water, hydropower plants) is the most suitable alternative for all expert, but each expert has different suggestion. Furtheremore, the next questionnaire survey include stakeholders and community of watershed, and selecting river restoration public education for community of watershed.
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Beechie, Timothy J., Caleb Fogel, Colin Nicol, and Britta Timpane-Padgham. "A process-based assessment of landscape change and salmon habitat losses in the Chehalis River basin, USA." PLOS ONE 16, no. 11 (November 2, 2021): e0258251. http://dx.doi.org/10.1371/journal.pone.0258251.

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Identifying necessary stream and watershed restoration actions requires quantifying natural potential habitat conditions to diagnose habitat change and evaluate restoration potential. We used three general methods of quantifying natural potential: historical maps and survey notes, contemporary reference sites, and models. Historical information was available only for the floodplain habitat analysis. We used contemporary reference sites to estimate natural potential habitat conditions for wood abundance, riparian shade, main channel length, and side channel length. For fine sediment, temperature, and beaver ponds we relied on models. We estimated a 90% loss of potential beaver pond area, 91% loss of side-channel length, and 92% loss or degradation of floodplain marshes and ponds. Spawning habitat area change due to wood loss ranged from -23% to -68% across subbasins. Other changes in habitat quantity or quality were smaller—either in magnitude or spatial extent—including rearing habitat areas, stream temperature, and accessible stream length. Historical floodplain habitat mapping provided the highest spatial resolution and certainty in locations and amounts of floodplain habitat lost or degraded, whereas use of the contemporary reference information provided less site specificity for wood abundance and side-channel length change. The models for fine sediment levels and beaver pond areas have the lowest reach-specific certainty, whereas the model of temperature change has higher certainty because it is based on a detailed riparian inventory. Despite uncertainties at the reach level, confidence in subbasin-level estimates of habitat change is moderate to high because accuracy increases as data are aggregated over multiple reaches. Our results show that the largest habitat losses were floodplain and beaver pond habitats, but use of these habitat change results in salmon life-cycle models can illustrate how the potential benefits of alternative habitat restoration actions varies among species with differing habitat preferences.
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Sender, Joana, and Weronika Maślanko. "Landscape Factors Influencing Diversity of Habitat Conditions Across a Watercourse in the Vicinity of Tomaszów Lubelski City in the Roztocze Region (Poland)." Transylvanian Review of Systematical and Ecological Research 17, no. 1 (June 1, 2015): 15–28. http://dx.doi.org/10.1515/trser-2015-0045.

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Abstract The aim of the study was a hydromorphological valorisation of the river valley in the Roztocze region using the British method - River Habitat Survey (RHS). As a result of field research two numerical indicators HMS (Habitat Modification Score) and HQA (Habitat Quality Assessment) were identified and purity water classes were defined. The river did not fulfil the requirements of the Water Framework Directive, because its state was defined as poor and moderate. On the base of physical and chemical parameters, in the majority of water studied the watercourses were classified to the first class of purity. Only in one segment waters were below the first class, or even out of class.
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30

Bateman, Heather L., Sidney B. Riddle, and Erin S. Cubley. "Using Bioacoustics to Examine Vocal Phenology of Neotropical Migratory Birds on a Wild and Scenic River in Arizona." Birds 2, no. 3 (August 2, 2021): 261–74. http://dx.doi.org/10.3390/birds2030019.

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Passive acoustic recorders have been used successfully as automated survey tools to detect terrestrial wildlife. However, few studies have monitored Neotropical migratory bird use of riparian forest habitat using this technology. Within dryland ecosystems, the forests along rivers support high bird diversity. Many bird species of conservation concern require these floodplain forest habitats for foraging, migration stop-overs, and breeding. Few studies have explored the use of acoustic records in riverine systems designated for conservation for their natural resource value via the Wild and Scenic Rivers Act in the USA. Using acoustic recorders, we document vocal activity of four riparian-obligate species (Bell’s Vireo, Vireo bellii; Summer Tanager, Piranga rubra; Yellow Warbler, Setophaga petechial; and Yellow-billed Cuckoo, Coccyzus americanus) to determine species occurrence along a Wild and Scenic River. We established three study reaches along the perennial Lower Verde River, in the Sonoran Desert of central Arizona, USA. Nine acoustic recorders were used over the period of 80–120 days during the summer of 2018. We measured vegetation composition and structure in 100 m2 plots paired with acoustic recorders. Visualizing vocal activity showed that three species were calling and singing at each reach; whereas, one species, the cuckoo, had fewer recordings and occurred later in the summer. We demonstrate the utility of acoustic monitoring even when applied to rare birds in complex riparian habitats. This information is important for land management and conservation efforts concerning these species of interest and identifying important habitat features in Southwestern US riparian woodlands.
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31

Nurdawati, Syarifah. "KEANEKARAGAMAN DAN DISTRIBUSI BENIH IKAN DI BEBERAPA TIPE HABITAT SUNGAI BATANGHARI, JAMBI." Jurnal Penelitian Perikanan Indonesia 13, no. 2 (February 10, 2017): 71. http://dx.doi.org/10.15578/jppi.13.2.2007.71-86.

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Penelitian keanekaragaman dan distribusi benih ikan di beberapa tipe habitat Sungai Batanghari, Jambi telah dilakukan dengan tujuan untuk mengetahui keanekaragaman benih ikan, habitat, dan distribusi. Penelitian ini dilakukan di perairan daerah aliran Sungai Batanghari yang terletak di Kodya Jambi (Danau Teluk dan Danau Buluran Kenali) dan Kabupaten Batanghari (Danau Kaos, Sungai Terap, Sungai Lubuk Ruso, dan Sungai Pijoan). Penelitian dilakukan pada waktu air surut setelah banjir besar. Contoh benih ikan dikumpulkan dari hasil percobaan penangkapan dan tangkapan nelayan kemudian diidentifikasi. Larva yang belum dapat diidentifikasi dipelihara terlebih dahulu di dalamhapa, danau, dan akuarium. Hasil penelitian menunjukkan bahwa terdapat 90 jenis benih ikan yang termasuk ke dalam 44 genus, 18 famili, 5 sub ordo dari Ordo Perciformes (Percoidei, Gobioidei, Anabantoidei, Channoidei, dan Mastacembeloidei) dan 6 ordo (Osteoglosiformes, Cypriniformes, Siluriformes, Perciformes Cyprinodontiformes, dan Tetraodontiformes). Famili Cyprinidae mendominasi jenis yang ditemukan yaitu 40 jenis, diikuti oleh Famili Bagridae 15 jenis. Padawaktu air banjir kualitas air di lokasi penelitian menunjukkan kondisi yang baik untuk kehidupan benih ikan dan pada saat air surut setelah banjir kualitas air menurun. Habitat benih ikan di lokasi pengamatanmerupakan habitat sementara dan setelah kualitas airmenurun benih-benih ikan melakukan ruaya menuju ke sungai utama dan seterusnya beruaya ke bagian hulu sungai. Study on biodiversity and distribution of fish fry in some type of habitats of Batanghari River basin, Jambi was conducted to observe the kind of fish species, habitat, and the distribution. Location of the experiment were Batanghari River in Kodya Jambi (Teluk Lake and Buluran Kenali Lake and Kabupaten Batanghari (Terap River, Lubuk Ruso River, and Pijoan River).The study used survey method for every lowest fluktuation water. Larva and seeds fish were collected from fishermen and identified. For larvae were collected and held in aquaria or in hapas in lake before identified. The results show that 90 species seed fish were collected, there are 44 genus, 18 familiy, 5 sub ordo from Ordo Perciformes (Percoidei, Gobioidei, Anabantoidei, Channoidei, dan Mastacembeloidei) and 6 Ordo (Osteoglosiformes, Cypriniformes, Siluriformes, Perciformes Cyprinodontiformes, dan Tetraodontiformes), about 40 species dominated by Cyprinidae. Water quality in location was good for hight water fluctuation and bad for lowest water fluctuation. Four habitats of seed fish were not permanent habitat and in bad condition water quality, seed fish were migrating out of the floodplain and leaved for up stream of Batanghari River.
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32

Borek, Łukasz. "Assessment and classification of hydromorphological state of the Breń River." Journal of Water and Land Development 30, no. 1 (September 1, 2016): 21–27. http://dx.doi.org/10.1515/jwld-2016-0017.

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Abstract The paper presents the classification of the hydromorphological condition of the Breń River according to the River Habitat Survey (RHS). The research of the hydromorphological assessment of the Breń River, which is a right-bank tributary of the Vistula River and almost entirely flows through the area of the Dąbrowa Tarnowska district was conducted in June 2015. The research sites were situated on the border of the Tarnów Plateau and the Vistula Lowland. The Breń River in these sections flows through rural areas used for agricultural purposes with low-density housing. The analysis of qualitative parameters describing the morphological characteristics were based on two synthetic indices of stream quality: Habitat Quality Assesment (HQA) and Habitat Modification Score (HMS). The calculated numerical values of the two indices proved that the sections of the Breń River correspond with the third and fifth class, which means a moderate (III) and very bad (V) hydromorphological condition.
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33

Kendrick, Michael R., and Alexander D. Huryn. "Ephemeral wetlands as significant habitat for threatened crayfish in Alabama, USA." Freshwater Crayfish 21, no. 1 (December 31, 2015): 147–52. http://dx.doi.org/10.5869/fc.2015.v21-1.147.

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Abstract While ephemeral wetlands contribute significantly to regional freshwater biodiversity, their role in supporting threatened and imperiled species of crayfish is not widely recognized. As the center of global crayfish biodiversity, the southeastern United States (US), and the state of Alabama (AL) in particular, are important focal areas where information is needed to develop understanding of habitat constraints determining the distributions of crayfish species. To this end, we documented crayfish species associated with ephemeral wetlands and associated wetland habitats that have been traditionally under sampled. Fifteen species of crayfish were documented among 96 survey sites. This assemblage included three Alabama state-listed Priority 1 species [Cambarellus diminutus Hobbs, Fallicambarus burrisi Fitzpatrick, Procambarus viaeviridis (Faxon)] and five Priority 2 species [Hobbseus prominens (Hobbs), Orconectes lancifer (Hagan), Procambarus evermanni (Faxon), P. leconti (Hagan), P. marthae Hobbs]. An undescribed species of Cambarellus (“sp. A”) was also documented, and will presumably be eventually designated a Priority 1 species in Alabama due to its restricted distribution and apparent endemism. Ten species of crayfish were documented from ephemeral wetlands, including four Priority 1 and 2 species [Cambarellus sp. A (presumed Priority 1 species), H. prominens, P. marthae, P. viaeviridis]. Most populations of Priority 1 and 2 species we documented are within the 100-year floodplain of the Black Warrior River. Ephemeral wetlands and associated wetland habitats within the floodplains of large rivers thus appear to be vital habitat for threatened and imperiled crayfish in Alabama. Our results suggest that future crayfish surveys should include sampling of these important but often overlooked habitats.
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34

Freeman, Mary C., Megan M. Hagler, Phillip M. Bumpers, Kit Wheeler, Seth J. Wenger, and Byron J. Freeman. "Long-Term Monitoring Data Provide Evidence of Declining Species Richness in a River Valued for Biodiversity Conservation." Journal of Fish and Wildlife Management 8, no. 2 (August 1, 2017): 418–34. http://dx.doi.org/10.3996/122016-jfwm-090.

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Abstract Free-flowing river segments provide refuges for many imperiled aquatic biota that have been extirpated elsewhere in their native ranges. These biodiversity refuges are also foci of conservation concerns because species persisting within isolated habitat fragments may be particularly vulnerable to local environmental change. We have analyzed long-term (14- and 20-y) survey data to assess evidence of fish species declines in two southeastern U.S. rivers where managers and stakeholders have identified potentially detrimental impacts of current and future land uses. The Conasauga River (Georgia and Tennessee) and the Etowah River (Georgia) form free-flowing headwaters of the extensively dammed Coosa River system. These rivers are valued in part because they harbor multiple species of conservation concern, including three federally endangered and two federally threatened fishes. We used data sets comprising annual surveys for fish species at multiple, fixed sites located at river shoals to analyze occupancy dynamics and temporal changes in species richness. Our analyses incorporated repeated site-specific surveys in some years to estimate and account for incomplete species detection, and test for species-specific (rarity, mainstem-restriction) and year-specific (elevated frequencies of low- or high-flow days) covariates on occupancy dynamics. In the Conasauga River, analysis of 26 species at 13 sites showed evidence of temporal declines in colonization rates for nearly all taxa, accompanied by declining species richness. Four taxa (including one federally endangered species) had reduced occupancy across the Conasauga study sites, with three of these taxa apparently absent for at least the last 5 y of the study. In contrast, a similar fauna of 28 taxa at 10 sites in the Etowah River showed no trends in species persistence, colonization, or occupancy. None of the tested covariates showed strong effects on persistence or colonization rates in either river. Previous studies and observations identified contaminants, nutrient loading, or changes in benthic habitat as possible causes for fish species declines in the Conasauga River. Our analysis provides baseline information that could be used to assess effectiveness of future management actions in the Conasauga or Etowah rivers, and illustrates the use of dynamic occupancy models to evaluate evidence of faunal decline from time-series data.
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35

Adamczyk, Mikołaj, Piotr Parasiewicz, Paolo Vezza, Paweł Prus, and Giovanni De Cesare. "Empirical Validation of MesoHABSIM Models Developed with Different Habitat Suitability Criteria for Bullhead Cottus Gobio L. as an Indicator Species." Water 11, no. 4 (April 8, 2019): 726. http://dx.doi.org/10.3390/w11040726.

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Application of instream habitat models such as the Mesohabitat Simulation Model (MesoHABSIM) is becoming increasingly popular. Such models can predict alteration to a river physical habitat caused by hydropower operation or river training. They are a tool for water management planning, especially in terms of requirements of the Water Framework Directive. Therefore, model verification studies, which investigate the accuracy and reliability of the results generated, are essential. An electrofishing survey was conducted in September 2014 on the Stura di Demonte River located in north-western Italy. One hundred and sixteen bullhead—Cottus gobio L.—were captured in 80 pre-exposed area electrofishing (PAE) grids. Observations of bullhead distribution in various habitats were used to validate MesoHABSIM model predictions created with inductive and deductive habitat suitability indices. The inductive statistical models used electrofishing data obtained from multiple mountainous streams, analyzed with logistic regression. The deductive approach was based on conditional habitat suitability criteria (CHSC) derived from expert knowledge and information gathered from the literature about species behaviour and habitat use. The results of model comparison and validation show that although the inductive models are more precise and reflect site- and species-specific characteristics, the CHSC model provides quite similar results. We propose to use inductive models for detailed planning of measures that could potentially impair riverine ecosystems at a local scale, since the CHSC model provides general information about habitat suitability and use of such models is advised in pre-development or generic scale studies. However, the CHSC model can be further calibrated with localized electrofishing data at a lower cost than development of an inductive model.
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36

Cunha, António, Pedro Gonçalves, João Barreira, António Trigo, and Samantha Jane Hughes. "Mobile RHS: A Mobile Application to Support the “River Habitat Survey” Methodology." Procedia Computer Science 64 (2015): 87–94. http://dx.doi.org/10.1016/j.procs.2015.08.467.

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37

Harper, David, and Mark Everard. "Why should the habitat-level approach underpin holistic river survey and management?" Aquatic Conservation: Marine and Freshwater Ecosystems 8, no. 4 (July 1998): 395–413. http://dx.doi.org/10.1002/(sici)1099-0755(199807/08)8:4<395::aid-aqc297>3.0.co;2-x.

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38

CASWELL, P. A., and M. W. APRAHAMIAN. "USE OF RIVER HABITAT SURVEY TO DETERMINE THE SPAWNING HABITAT CHARACTERISTICS OF TWAITE SHAD (ALOSA FALLAX FALLAX)." Bulletin Français de la Pêche et de la Pisciculture, no. 362-363 (2001): 919–29. http://dx.doi.org/10.1051/kmae:2001027.

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39

Li, Xinhai, Matthew K. Litvak, and John E. Hughes Clarke. "Overwintering habitat use of shortnose sturgeon (Acipenser brevirostrum): defining critical habitat using a novel underwater video survey and modeling approach." Canadian Journal of Fisheries and Aquatic Sciences 64, no. 9 (September 1, 2007): 1248–57. http://dx.doi.org/10.1139/f07-093.

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The overwintering habitat use of shortnose sturgeon (Acipenser brevirostrum) was investigated from January to March 2005 in the upper Kennebecasis River, New Brunswick, Canada, using a novel underwater video camera system and modeling approach. Following a random sampling procedure, 187 holes were drilled into the ice, and 234 sturgeon were counted and video-recorded. We found that sturgeon concentrated in a 2 ha area at the confluence of the Kennebecasis and Hammond rivers on a flat sandy substrate at a depth of 3.1–6.9 m. Generalized linear models were developed to describe the relationship of shortnose sturgeon density and habitat variables. The model indicated that the shortnose sturgeon had significant preference to deeper areas within this region. The total abundance of shortnose sturgeon in the area was estimated to be 4836 ± 69 (mean ± standard error) using the ordinary kriging method to interpolate sturgeon density at unsampled sites. This overwintering habitat of shortnose sturgeon can be defined as critical habitat following the identification policies of the Canadian Species at Risk Act (SARA).
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40

Carmichael, Richard A., Daniele Tonina, Ernest R. Keeley, Rohan M. Benjankar, and Kevin E. See. "Some like it slow: a bioenergetic evaluation of habitat quality for juvenile Chinook salmon in the Lemhi River, Idaho." Canadian Journal of Fisheries and Aquatic Sciences 77, no. 7 (July 2020): 1221–32. http://dx.doi.org/10.1139/cjfas-2019-0136.

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Management and conservation of freshwater habitat requires fine spatial resolution and watershed-scale and life-stage-specific methods due to complex linkages among land, climate, water uses, and aquatic organism necessities. In this study, we present a valley-scale microhabitat resolution, process-based bioenergetics approach that combines high-resolution topobathymetric LiDAR survey with two-dimensional hydrodynamic and bioenergetics modeling. We applied the model to investigate the role of lateral habitat, stream morphological complexity, water use, and temperature regimes on aquatic habitat quality distribution of juvenile Chinook salmon (Oncorhynchus tshawytscha) within the Lemhi River (eastern Idaho, USA). Modeling results showed two key aspects: (i) a reduction in diverted flows is not sufficient to improve habitat quality potentially because of a legacy of morphological simplification (directly due to straightening and wood removal and indirectly due to low in-channel flows) and (ii) morphological complexity and connectivity with side channels and margin areas, which are key and vital elements to support suitable habitats that meet or exceed energetic needs to sustain or promote growth of individuals and populations.
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41

Lee, Ling-Ling. "Status and distribution of river otters in Kinmen, Taiwan." Oryx 30, no. 3 (July 1996): 202–6. http://dx.doi.org/10.1017/s0030605300021645.

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Surveys of river otters Lutra lutra on Kinmen and Little Kinmen islands were carried out in 1992 and 1993. In order to record sightings of otters in the past, 12 Kinmen residents who had seen or caught otters before were interviewed. Interview results indicated that the otter is a resident, breeding species on Kinmen. Survey results indicated presence of otters throughout Kinmen and in many sites on Little Kinmen. However, habitat degradation, including pollution and drought, may pose serious threats to the continued existence of the species on both islands.
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42

E. Punt, André. "A note regarding conditioning simulation trials for data-poor management strategy evaluations." IWC Journal of Cetacean Research and Management 20, no. 1 (January 1, 2019): 81–92. http://dx.doi.org/10.47536/jcrm.v20i1.239.

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A boat-based survey was conducted in the Tefé river and lake (Brazil) in December 2013, during the transitional water period. A combination ofstrip-width transects parallel to the river, lake-margins and confluences, and cross-channel line transects in the lake, were used to cover a totaldistance of 670 linear kilometres of the dolphins’ habitat. A total of 383 groups of Amazon river dolphin and 124 groups of tucuxi were observed.Group size, density and abundance estimates were obtained per species and habitat (tributary, lake-margin and confluence). Group sizes rangedfrom one to six individuals for the Amazon river dolphin and from one to eight individuals for the tucuxi. The abundance of river dolphins washigher for the Amazon river dolphin (911, CV = 0.15) than the tucuxi (511, CV = 0.26). Higher densities were found in the lake-margin and tributaryfor the Amazon river dolphin and in the confluences for the tucuxi. Lake-margins, confluences and tributaries are therefore proposed as criticalhabitats for the conservation of river dolphins in central Amazonia. The Tefé lake is identified as an area of concern due to a high number of humanstressors such as boat traffic, fishing and habitat degradation.
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Newson, M. D., and C. L. Newson. "Geomorphology, ecology and river channel habitat: mesoscale approaches to basin-scale challenges." Progress in Physical Geography: Earth and Environment 24, no. 2 (June 2000): 195–217. http://dx.doi.org/10.1177/030913330002400203.

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The physical component of river channel (instream) habitat is of acknowledged significance, particularly in headwater streams; furthermore, physical habitats have been heavily impacted by human needs for river services: principally flood defence (channel modification) and water resources (flow regulation). Despite the control exercised on physical habitats by fluvial geomorphology (channel shape, bed material size, bedforms and bars) and flow regime (including the varying hydraulics of flow around these forms), their interaction has hitherto lacked a distinctive spatial formulation and biological validation. This article describes the challenges faced by a need (in both theoretical and practical areas) to understand the detail of physical habitat conditions in stream channels. A number of mesoscale approaches are emerging, both from ecology and geomorphology. We outline the field validation of a ‘habitat hydraulics’ approach to the interaction between river discharge and channel form. Qualitative ‘flow types’ are shown to be representative of discrete hydraulic conditions within mesoscale units of the channel bed described as ‘physical biotopes’. The approach is compared with parallel ecological research on ‘mesohabitats’ and ‘functional habitats’. The extent, pattern and discharge-variability of physical biotopes can be surveyed in the field and used as a spatial guide to biological sampling (in this case for benthic invertebrates). Biological patterns (at the scale sampled here) appear to respond first to the river continuum concept’s longitudinal zonation of the channel, but there is a marked secondary signal in statistical analyses from the pattern of biotopes. Given the promise of the physical biotope approach, its logical extension in predictive mode is via the hierarchical concepts shared by freshwater ecologists and geomorphologists; however, there is little agreement on scale terminology, hierarchical principles and, above all, a truly geo-morphological channel classification, based on reaches, into which mesoscale habitat typologies could be fed. Assuming a relationship between biological diversity and that of physical biotopes it should be the aim of river managers, whether intervening in the channel form or its flow regime, to optimize certain parameters of the pattern of biotopes; these parameters should be a focus for future research. Both the rapid survey and proper description of these patterns will benefit from the application of remote-sensing technology, improved instruments for microscale hydraulic studies and a GIS approach based upon the spatial principles of landscape ecology.
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Tri, Atmoko, and Mukhlisi. "The Conservation of Proboscis Monkey in Suwi River, East Kalimantan, Indonesia." BIO Web of Conferences 33 (2021): 01004. http://dx.doi.org/10.1051/bioconf/20213301004.

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Suwi River, which is a part of Kenohan-Suwi Wetland in East Kutai District, East Kalimantan is a habitat of endangered animals such as proboscis monkey (Nasalis larvatus). Therefore, this study aims to determine the habitat, distribution, threats, and conservation efforts of proboscis monkeys in the Suwi River. To achieve this, the boat survey method was adopted, while plot line samples were used for vegetation analysis. The results showed that the habitat is composed of riverine plant species, such as prupuk (Mallotus sumatranus; IV=121.84%), bungur (Lagerstroemia speciosa; IV=37.10%), and rengas (Gluta renghas; IV=34.76%). Furthermore, a minimum of 12 monkey groups was distributed in this area, however, their population is unknown. Illegal hunting by local people has caused population decline, this is in addition to other threats, such as habitat conversion, forest fire, and invasive plant species. The effort to protect the habitat of proboscis monkeys was made by developing Essential Ecosystem Areas Suwi-Mesangat. Other institutions that committed to protecting this area include Federal and local government, NGO, local community, and palm oil company
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Buckton, S. T., and S. J. Ormerod. "Use of a new standardized habitat survey for assessing the habitat preferences and distribution of upland river birds." Bird Study 44, no. 3 (November 1997): 327–37. http://dx.doi.org/10.1080/00063659709461068.

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46

Just, Emily H., Sadie S. Stevens, Romeo M. Spinola, and Thomas L. Serfass. "Detecting river otterLontra canadensislatrines near bridges: does habitat and season influence survey success?" Wildlife Biology 18, no. 3 (September 2012): 264–71. http://dx.doi.org/10.2981/11-042.

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47

Eniang, Edem A., Clement O. Ebin, Ayuk A. Nchor, Gabriel I. Agba, Idorenyin K. Gideon, Giovanni Amori, and Luca Luiselli. "Distribution and status of the African forest buffalo Syncerus caffer nanus in south-eastern Nigeria." Oryx 51, no. 3 (May 26, 2016): 538–41. http://dx.doi.org/10.1017/s0030605315001507.

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AbstractAlthough not categorized as threatened on the IUCN Red List, the African forest buffalo Syncerus caffer nanus is declining across its range. In Nigeria its distribution, abundance and status are virtually unknown. We conducted interviews with experienced hunters, and field surveys (linear and recce transects), to study the buffalo's distribution and ecology in the montane forests of Cross River State. General linear modelling indicated that the number of individuals varied significantly across survey areas and habitat types but not with the survey period, and there was no study area × study period interaction. Buffalo were found most commonly in mature and secondary forests. Given the species’ scattered distribution, fragmentation of its habitat, and the relatively low numbers observed, Nigerian populations require a separate, regional categorization on the IUCN Red List.
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GILBERT, MARTIN, BAYARBAATAR BUUVEIBAATAR, AMANDA E. FINE, LOSOLMAA JAMBAL, and SAMANTHA STRINDBERG. "Declining breeding populations of White-naped Cranes in Eastern Mongolia, a ten-year update." Bird Conservation International 26, no. 4 (May 31, 2016): 490–504. http://dx.doi.org/10.1017/s0959270915000301.

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SummaryEastern Mongolia supports one of the most important breeding populations of the White-naped Crane Antigone vipio (WNC), which is classified as ‘Vulnerable’ by the IUCN. Large numbers of WNCs were found to be breeding at high densities within the Ulz River basin during surveys conducted in 2000 and 2001, along a 270 km section of the river. Following these surveys, an extended drought continuing for at least a decade has threatened wetland ecosystems throughout Eastern Mongolia. This study reports the findings of surveys conducted in 2010 and 2011 along the same section of the Ulz River surveyed a decade earlier, as well as a generalised survey of other sites where breeding WNCs had previously been recorded. Along the Ulz River, populations declined from 42 territorial pairs in 2001 to 17 in 2011. Estimates of detection probability using distance sampling and occupancy methods at two locations gave consistent results of 23%–27% detectability. With a minimum population of 234 WNCs observed across all sites in 2011, these detection probabilities suggest that the areas surveyed support the majority of breeding WNCs in the western population. Although we cannot exclude the movement of WNCs beyond the survey area, these findings also suggest that the population has declined between 2001 and 2011. Exploration of key habitat variables using occupancy models and generalized linear mixed models found that WNCs favoured areas of high wet vegetation (estimated as ‘wet meadow’ coverage and using normalized difference vegetation index), and low grazing pressure. Given the importance of water resources to WNCs and nomadic herding communities, use of wetland habitat must be carefully managed to balance the needs of cranes and people, particularly during periods of drought.
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Karunarathna, Suranjan, Thilina Surasinghe, Majintha Madawala, Ruchira Somaweera, and A. A. Thasun Amarasinghe. "Ecological and behavioural traits of the Sri Lankan water monitor (Varanus salvator) in an urban landscape of Western Province, Sri Lanka." Marine and Freshwater Research 68, no. 12 (2017): 2242. http://dx.doi.org/10.1071/mf17038.

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The Asian water monitor Varanus salvator is one of the largest species of lizard in the world and is widespread on the island of Sri Lanka. In the present study, we conducted a 7-month survey within a 5-km stretch in the urbanised Attanagalu-Oya river area to study habitat associations, mesohabitat use and behaviour of V. salvator in urban landscapes. The greatest number of monitor sightings was made in aquatic habitats, followed by terrestrial and arboreal habitats within the riparian zone. Sightings of different life history stages of V. salvator across major habitat types varied significantly. The adults and subadults associated mostly with aquatic and terrestrial habitats, whereas hatchlings and juveniles associated mostly with aquatic and arboreal habitats. Given variable sighting frequencies of distinct life history stages across different major habitat types, it is likely that there is substantial age-structured niche partitioning in V. salvator. The urban population of V. salvator studied seemed to be fairly abundant, and resilient to anthropogenic stressors and adversity of urbanisation. In species-depauperate urban environments, ecosystem functions provisioned by V. salvator as generalist predators as well as scavengers are arguably significant and deserve further investigation. No direct anthropogenic threats were observed during the study.
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Palla, Rocille Quilantang, Wilfredo Lopez Campos, and Annabelle Del Norte Campos. "HABITAT HEALTH OF ILOILO RIVER - INSIGHTS FROM A STUDY ON BENTHIC COMMUNITY STRUCTURE." Marine Research in Indonesia 38, no. 1 (April 7, 2015): 39–47. http://dx.doi.org/10.14203/mri.v38i1.55.

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In west central Philippines, the monitoring of aquatic systems traditionally focused on dissolved oxygen values and biological oxygen demand, e.g. monitoring by the Environmental Monitoring Bureau around Panay Island. However, single or two factors are considered to be insufficient to assess habitat health precisely. In this paper, we investigated a benthic community and xamined their implications to habitat health of the Iloilo River. According to a prior benthic survey, warning signs pertaining to biotic, abiotic and community factors have been detected. The disturbed onditions in Iloilo River can be attributed to 3 factors; 1) its inherent topography, where bends serve as sinks for materials; 2) the lack of vigorous water exchange that promotes deposition and hinders complete flushing; and 3) the manner of utilization of the river by the local people. We thus concluded that: 1) monitoring for water parameters only is not enough to get a clear picture of habitat health; and 2) proposed that biotic components should be included for monitoring aquatic system.
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