65 results match your criteria endangered riverine

Seasonal analysis of food items and feeding habits of endangered riverine catfish Rita rita (Hamilton, 1822).

Braz J Biol 2021 4;82:e237040. Epub 2021 Jun 4.

King Saud University, College of Science, Department of Zoology, Riyadh, Saudi Arabia.

This investigation presents the food and feeding activity of and endangered riverine catfish Rita rita, during February 2017-January 2018. A total of 225 fish individuals was analyzed for stomach contents by characterizing the dominant food items and morphometric features. The results divulged ten major food items consumed, preferably fish scales and eggs, teleost fishes, copepods, cladocerans, rotifers, and mollusks. Read More

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The Irrawaddy dolphin, Orcaella brevirostris from the Mekong river Cambodia: Preliminary health and toxicological investigations.

Aquat Toxicol 2021 May 21;234:105812. Epub 2021 Mar 21.

Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine Hannover, Werftstr. 6, 25761 Büsum, Germany.

The subpopulation of the Irrawaddy dolphin (Orcaella brevirostris) living in the Mekong River, Cambodia, is considered to be critically endangered. The aim of the investigation was to gain information about the genetic variation, health status and exposure to toxic compounds of these dolphins. Tissue samples from 27 Irrawaddy river dolphins found dead along the Mekong River between 2004 and 2009 were analysed with regards to genetics, pathology and ecotoxicology. Read More

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Gharial nesting in a reservoir is limited by reduced river flow and by increased bank vegetation.

Sci Rep 2021 Feb 26;11(1):4805. Epub 2021 Feb 26.

Laboratory of Soil Biology and Microbial Ecology, Department of Environmental Studies, University of Delhi, Delhi, 110007, India.

The gharial (Gavialis gangeticus Gmelin) is a fish-eating specialist crocodylian, endemic to south Asia, and critically endangered in its few remaining wild localities. A secondary gharial population resides in riverine-reservoir habitat adjacent to the Nepal border, within the Katerniaghat Wildlife Sanctuary (KWS), and nests along a 10 km riverbank of the Girwa River. A natural channel shift in the mainstream Karnali River (upstream in Nepal) has reduced seasonal flow in the Girwa stretch where gharials nest, coincident with a gradual loss of nest sites, which in turn was related to an overall shift to woody vegetation at these sites. Read More

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February 2021

Island and Riverine populations of Alouatta belzebul from the Brazilian Amazon parasitized by Pediculus mjobergi.

Vet Parasitol Reg Stud Reports 2020 12 6;22:100476. Epub 2020 Oct 6.

UNESP - Universidade Estadual Paulista "Júlio de Mesquita Filho", Faculdade de Medicina Veterinária e Zootecnia, Departamento de Clínica Veterinária, Rua Prof. Doutor Walter Mauricio Correa s/n - Caixa Postal 560, CEP: 18618-681, Botucatu, SP, Brazil. Electronic address:

Mammalian lice are obligate hematophagous ectoparasites that remain on the host throughout the life cycle. This study showed an endangered wild howler species (Alouatta belzebul) parasitized by Pediculus mjobergi. Twenty-seven primates were rescued during wildlife rescue activities in the process of vegetation suppression at the Belo Monte Hydroelectric Power Plant (UHE), located on the lower Xingu River, in the Brazilian Amazon basin. Read More

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December 2020

Habitat characterization and species distribution model of the only large-lake population of the endangered Silver Chub (, Kirtland 1844).

Ecol Evol 2020 Nov 7;10(21):12076-12090. Epub 2020 Oct 7.

US Geological Survey Great Lakes Science Center Lake Erie Biological Station Sandusky OH USA.

The endangered Silver Chub ( Kirtland 1844) is native to North America and primarily riverine, with the only known large-lake population in Lake Erie. Once a major component of the Lake Erie fish community, it declined and became nearly extirpated in the mid-1900s. Recent collections in western Lake Erie suggest that Silver Chub may be able to recover, but their habitat and distribution are poorly known. Read More

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November 2020

Riverine plastic pollution from fisheries: Insights from the Ganges River system.

Sci Total Environ 2021 Feb 4;756:143305. Epub 2020 Nov 4.

Centre for Ecology and Conservation, University of Exeter, Cornwall TR10 9EZ, UK; Zoological Society of London, Regent's Park, London NW1 4RY, UK.

Abandoned, lost or otherwise discarded fishing gear represents a substantial proportion of global marine plastic pollution and can cause significant environmental and socio-economic impacts. Yet little is known about its presence in, and implications for, freshwater ecosystems or its downstream contribution to plastic pollution in the ocean. This study documents fishing gear-related debris in one of the world's largest plastic pollution contributing river catchments, the Ganges. Read More

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February 2021

Diversity of medium and large mammals in the Loka Abaya National Park, southern Ethiopia.

Ecol Evol 2020 Sep 28;10(18):9896-9905. Epub 2020 Aug 28.

Ethiopian Wildlife Conservation Authority Project Addis Ababa Ethiopia.

We evaluated the richness, diversity, and composition of the medium and large mammal community in the Loka Abaya National Park (LANP), southern Ethiopia, and how these parameters differ among four habitat types: wooded grassland, riverine forest, hilly scrubland and wetland, and between seasons. We recorded a total of 2,573 individual animals of 28 medium and large mammal species in the park. This included three globally threatened species: the endangered African wild dog (), the vulnerable Leopard (), and Hippopotamus (). Read More

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September 2020

Advection exacerbates population decline from habitat loss: maintaining threatened taxa while restoring natural river flow regimes.

Oecologia 2020 Jul 25;193(3):773-785. Epub 2020 Jul 25.

Environmental Science Center, Laredo Community College, Laredo, USA.

Modification of flow regimes and habitat degradation are the strongest, most common, and often co-occurring human activities affecting riverine populations. Ongoing efforts to restore peak flow events found under pristine flow regimes could increase advection-driven dispersal for many species. In rivers with extensive habitat loss, increased advection could transport individuals from remnant populations into degraded downstream areas, causing restored flow regimes to decrease persistence of threatened species. Read More

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The Patterns and Puzzles of Genetic Diversity of Endangered Freshwater Mussel Philipsson, 1788 Populations from Vistula and Neman Drainages (Eastern Central Europe).

Life (Basel) 2020 Jul 21;10(7). Epub 2020 Jul 21.

Department of Genetics and Biosystematics, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland.

Mussels of the family Unionidae are important components of freshwater ecosystems. Alarmingly, the International Union for Conservation of Nature and Natural Resources Red List of Threatened Species identifies almost 200 unionid species as extinct, endangered, or threatened. Their decline is the result of human impact on freshwater habitats, and the decrease of host fish populations. Read More

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Elephants in the neighborhood: patterns of crop-raiding by Asian elephants within a fragmented landscape of Eastern India.

PeerJ 2020 2;8:e9399. Epub 2020 Jul 2.

Endangered Species Management, Wildlife Institute of India, Dehradun, Uttarakhand, India.

Loss of forest cover, rise in human populations and fragmentation of habitats leads to decline in biodiversity and extinction of large mammals globally. Elephants, being the largest of terrestrial mammals, symbolize global conservation programs and co-occur with humans within multiple-use landscapes of Asia and Africa. Within such shared landscapes, poaching, habitat loss and extent of human-elephant conflicts (HEC) affect survival and conservation of elephants. Read More

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The influence of surrounding land cover on wetland habitat conditions: a case study of inland wetlands in South Korea.

PeerJ 2020 18;8:e9101. Epub 2020 May 18.

Department of Integrated Biological Sciences, Pusan National University, Busan, South Korea.

Wetland ecosystems have been globally degraded and lost due to rapid urbanization and climate change. An assessment of national scale inventory, including wetland types and conditions, is urgently required to understand the big picture of endangered wetlands, such as where they are and how they look like. We analyzed the spatial patterns of each inland wetland type (brackish wetland was included) in South Korea and the relative importance of land cover categories on wetland conditions. Read More

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Recruitment of a critically endangered sawfish into a riverine nursery depends on natural flow regimes.

Sci Rep 2019 11 19;9(1):17071. Epub 2019 Nov 19.

Centre for Sustainable Aquatic Ecosystems, Harry Butler Institute, Murdoch University, 90 South Street, Murdoch, WA, 6150, Australia.

The freshwater sawfish (Pristis pristis) was recently listed as the most Evolutionarily Distinct and Globally Endangered (EDGE) animal. The Fitzroy River in the remote Kimberley region of north-western Australia represents a significant stronghold for the species, which uses the freshwater reaches of the river as a nursery. There is also mounting pressure to develop the water resources of the region for agriculture that may substantially affect life history dynamics of sawfish in this system. Read More

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November 2019

Phylogeography of the endangered sand dune whiptail lizard Glaucomastix abaetensis (Dias, Rocha amp; Vrcibradic, 2002) with the description of a new species.

Zootaxa 2019 Jul 2;4624(4):zootaxa.4624.4.1. Epub 2019 Jul 2.

Programa de Pós-Graduação em Diversidade Animal, Universidade Federal da Bahia, CEP 40170-290, Salvador, BA, Brazil.

Several species of Glaucomastix lizards have been described over the past decade, most of these inhabit inland Brazil. Glaucomastix abaetensis is a threatened whiptail endemic to Brazilian coastal "restinga" (sandy habitats) from Bahia State to Sergipe, with a distribution limited by riverine barriers. In order to investigate the differentiation and relationships in G. Read More

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Interacting effects of vessel noise and shallow river depth elevate metabolic stress in Ganges river dolphins.

Sci Rep 2019 10 28;9(1):15426. Epub 2019 Oct 28.

Ashoka Trust for Research in Ecology and the Environment (ATREE), Royal Enclave Srirampura, Jakkur PO, Bangalore, 560064, Karnataka, India.

In riverine 'soundscapes', complex interactions between sound, substrate type, and depth create difficulties in assessing impacts of anthropogenic noise pollution on freshwater fauna. Underwater noise from vessels can negatively affect endangered Ganges river dolphins (Platanista gangetica), which are 'almost blind' and rely entirely on high-frequency echolocation clicks to sense their environment. We conducted field-based acoustic recordings and modelling to assess acoustic responses of Platanista to underwater noise exposure from vessels in the Ganga River (India), which is now being transformed into a major waterway. Read More

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October 2019

The near-complete mitogenome of the critically endangered (Caenogastropoda: Paludomidae) from the Congo River assembled from historical museum material.

Mitochondrial DNA B Resour 2019 Sep 25;4(2):3229-3231. Epub 2019 Sep 25.

Department of Animal Ecology and Systematics, Justus Liebig University Giessen, Giessen, Germany.

Here, we present the first near-complete mitogenome of a member of the freshwater gastropod family Paludomidae, . This Congo River species is of particular importance because the sister to the Lake Tanganyika radiation is supposed to be a paludomid riverine species. We used ancient DNA (aDNA) techniques including single-stranded DNA library preparation in order to assemble the mitogenome from historical museum material collected in 1937. Read More

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September 2019

Ocean warming and acidification may challenge the riverward migration of glass eels.

Biol Lett 2019 01;15(1):20180627

1 MARE - Marine and Environmental Sciences Centre, Laboratório Marítimo da Guia, Faculdade de Ciências da Universidade de Lisboa , Avenida Nossa Senhora do Cabo 939, 2750-374 Cascais , Portugal.

The dramatic decline of European eel ( Anguilla anguilla) populations over recent decades has attracted considerable attention and concern. Furthermore, little is known about the sensitivity of the early stages of eels to projected future environmental change. Here, we investigated, for the first time, the potential combined effects of ocean warming (OW; Δ + 4°C; 18°C) and acidification (OA; Δ - 0. Read More

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January 2019

Assessment and prediction of spatial patterns of human-elephant conflicts in changing land cover scenarios of a human-dominated landscape in North Bengal.

PLoS One 2019 1;14(2):e0210580. Epub 2019 Feb 1.

Faculty of Wildlife Sciences, Wildlife Institute of India, Dehradun, Uttarakhand, India.

It is of utmost importance to research on the spatial patterns of human-wildlife conflicts to understand the underlying mechanism of such interactions, i.e. major land use changes and prominent ecological drivers. Read More

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October 2019

Riverscape genetic variation, migration patterns, and morphological variation of the threatened Round Rocksnail, Leptoxis ampla.

Mol Ecol 2019 04 13;28(7):1593-1610. Epub 2019 Apr 13.

Department of Biological and Environmental Sciences, Troy University, Troy, Alabama.

Within riverine systems, headwater populations are hypothesized to harbour higher amounts of genetic distinctiveness than populations in the main stem of a river and display increased genetic diversity in large, downstream habitats. However, these hypotheses were mostly developed with insects and fish, and they have not been tested on many invertebrate lineages. Pleuroceridae gastropods are of particular ecological importance to rivers of eastern North America, sometimes comprising over 90% of macroinvertebrate biomass. Read More

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Responses of fish assemblage structure to large-scale weir construction in riverine ecosystems.

Sci Total Environ 2019 Mar 30;657:1334-1342. Epub 2018 Nov 30.

Department of Integrated Biological Science, Pusan National University, 46241 Busan, Republic of Korea. Electronic address:

Worldwide, increasing amounts of dams and weirs have been established in rivers in recent decades, often with drastic effects on their ecosystems. Between late 2009 and 2011, 16 large-scale dams were built in the main channels of the four largest rivers in South Korea, eight of these along the main channel of Nakdong River (300 km, 520 km in total). We studied the effect of these constructions on the fish community in the riparian zone based on intensive fish field surveys conducted in the littoral zone during 2007-2017, analysis of fishermen's catch data and molecular analysis of the diet of the keystone species, largemouth bass (Micropterus salmoides). Read More

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Whooping crane use of riverine stopover sites.

PLoS One 2019 9;14(1):e0209612. Epub 2019 Jan 9.

Executive Director's Office for the Platte River Recovery Implementation Program, Kearney, NE, United States of America.

Migratory birds like endangered whooping cranes (Grus americana) require suitable nocturnal roost sites during twice annual migrations. Whooping cranes primarily roost in shallow surface water wetlands, ponds, and rivers. All these features have been greatly impacted by human activities, which present threats to the continued recovery of the species. Read More

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September 2019

The Effect of Different Habitat Types and Ontogenetic Stages on the Diet Shift of a Critically Endangered Fish Species, (Sauvage and Dabry de Thiersant, 1874).

Int J Environ Res Public Health 2018 10 12;15(10). Epub 2018 Oct 12.

Key Laboratory of Ministry of Water Resources for Ecological Impacts of Hydraulic-Projects and Restoration of Aquatic Ecosystem, Institute of Hydroecology, Ministry of Water Resources & Chinese Academy of Sciences, Wuhan 430079, China.

This study examined the effect of habitat types and ontogenetic stages on the diet shift of (Sauvage and Dabry de Thiersant, 1874), a critically endangered fish species. Based on the stable isotope analysis method, the following was explored: the variations in δC and δN values, isotopic niche width and four basal food sources (Mollusks, Macrocrustaceans, Aquatic insect larvae and particulate organic matters (POMs)) among three essential habitat types (the spawning ground, natural riverine feeding and nursery area, and Three Gorges Reservoir area) and between two ontogenetic stages (immature and fully mature stages). A diet shift associated with habitat type changes was observed, but there were no obvious differences in diet composition between the two ontogenetic stages. Read More

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October 2018

Spawning-stock characteristics and migration of a lake-bound population of the endangered Macquarie perch Macquaria australasica.

J Fish Biol 2018 Oct;93(4):630-640

Arthur Rylah Institute for Environmental Research, Department of Environment, Land Water and Planning, Heidelberg, Victoria, Australia.

The intrapopulation variability in the size and age structure of the spawning stock and migration of the threatened Macquarie perch Macquaria australasica in Lake Dartmouth was investigated between 2008 and 2016. Sampling centred on the core reproductive period (October-December) when mature fish migrate from the lake into riverine habitat to spawn. Spawning fish were predominantly large, spanning a broad age structure, with a high proportion of fish (25%) aged 15-30 years. Read More

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October 2018

Traditional ecological knowledge and flood risk management: A preliminary case study of the Rwenzori.

Jamba 2018 31;10(1):536. Epub 2018 May 31.

Faculty of Agriculture and Environment, Gulu University, Uganda.

The shift from flood protection to flood risk management, together with recent arguments on incorporating culture in managing risk, underscores the application of traditional ecological knowledge (TEK) in managing disasters from flood hazards. Yet, documentation and incorporation of TEK into practice remains a challenge. This article contributes to addressing this challenge by exploring the existence of TEK to flooding in the Rwenzori Mountains, Uganda. Read More

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Dam trout: Genetic variability in Oncorhynchus mykiss above and below barriers in three Columbia River systems prior to restoring migrational access.

PLoS One 2018 31;13(5):e0197571. Epub 2018 May 31.

Northwest Fisheries Science Center, National Marine Fisheries Service, NOAA, Seattle, Washington, United States of America.

Restoration of access to lost habitat for threatened and endangered fishes above currently impassable dams represents a major undertaking. Biological monitoring is critical to understand the dynamics and success of anadromous recolonization as, in the case of Oncorhynchus mykiss, anadromous steelhead populations are reconnected with their conspecific resident rainbow trout counterparts. We evaluate three river systems in the Lower Columbia River basin: the White Salmon, Sandy, and Lewis rivers that are in the process of removing and/or providing passage around existing human-made barriers in O. Read More

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December 2018

Establishment of a Somatic Cell Bank for Indian Buffalo Breeds and Assessing the Suitability of the Cryopreserved Cells for Somatic Cell Nuclear Transfer.

Cell Reprogram 2018 06;20(3):157-163

1 ICAR-Central Institute of Research on Buffaloes , Hisar, India .

Biobanks of cryopreserved gametes and embryos of domestic animals have been utilized to spread desired genotypes and to conserve the animal germplasm of endangered breeds. In principle, somatic cells can be used for the same purposes, and for reviving of animals, the somatic cells must be suitable for animal cloning techniques, such as somatic cell nuclear transfer. In the present study, we derived and cryopreserved somatic cells from three breeds of riverine and swamp-like type buffaloes and established a somatic cell bank. Read More

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Food web contaminant dynamics of a large Atlantic Slope river: Implications for common and imperiled species.

Sci Total Environ 2018 Aug 28;633:1062-1077. Epub 2018 Mar 28.

South Carolina Department of Natural Resources, Bonneau, SC 29431, USA.

Persistent and bioaccumulative contaminants often reach concentrations that threaten aquatic life by causing alterations in organism behavior and development, disruption of biological processes, reproductive abnormalities, and mortality. The objectives of this research were to determine the aquatic food web structure and trophic transfer and accumulation of contaminants within a riverine ecosystem and identify potential stressors to the health of an imperiled fish, the robust redhorse (Moxostoma robustum) and other species of conservation concern in a large Atlantic Slope (USA) river. Trophic position was determined for food web taxa by stable isotope analyses of representative producers, consumers, and organic matter of the Yadkin-Pee Dee River of North Carolina and South Carolina. Read More

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Fecal Nutrients Suggest Diets of Higher Fiber Levels in Free-Ranging than in Captive Proboscis Monkeys ().

Front Vet Sci 2017 19;4:246. Epub 2018 Jan 19.

Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland.

Understanding the natural diet of species may provide useful information that can contribute to successful captive maintenance. A common problem experienced with captive foregut-fermenting primate (colobine) diets is that they are deficient in fiber and therefore highly digestible. This may contribute to gastrointestinal disorders often observed in zoos. Read More

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January 2018

Genetic Diversity of an Imperiled Neotropical Catfish and Recommendations for Its Restoration.

Front Genet 2017 12;8:196. Epub 2017 Dec 12.

Laboratório de Genética de Organismos Aquáticos e Aquicultura, Unidade de Biotecnologia, Núcleo Integrado de Biotecnologia, Universidade de Mogi das Cruzes, Mogi das Cruzes, Brazil.

The long-whiskered catfish (Family Pimelodidae) is endemic to the Paraíba do Sul River basin in southeastern Brazil. This species was heavily exploited by artisanal fisheries and faces challenges posed by dams, introduced species, and deterioration of critical habitat. The remaining populations are small and extirpated from some locales, and the species is listed as critically endangered in Brazil. Read More

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December 2017

Characterization of River Networks: A GIS Approach and Its Applications.

J Am Water Resour Assoc 2018 ;54(4):899-913

National Exposure Research Laboratory, U.S. Environmental Protection Agency, Cincinnati, Ohio, USA.

Fluvial geomorphology provides the basis for characterizing complex river networks and evaluating biophysical processes within watersheds. Understanding the spatial organization of morphological features, their influencing processes, and resultant geomorphic diversity in stream networks are important for efficient restoration, river health assessment, and improving our knowledge of the resilience of riverine landscapes. River characterization is a means to determine the biophysical character of river networks but many methods are fraught with pitfalls, such as the use of incorrect variables and limited acknowledgment of the hierarchical organization of rivers. Read More

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January 2018

Seasonal variations in bacterioplankton community structures in two small rivers in the Himi region of central Japan and their relationships with environmental factors.

World J Microbiol Biotechnol 2017 Nov 13;33(12):212. Epub 2017 Nov 13.

Graduate School of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama, Toyama, 930-8555, Japan.

The aim of this study was to improve our understanding of seasonal variations and the effects of physicochemical conditions on the bacterioplankton communities in two small rivers, the Moo and Nakayachi Rivers in the Himi region of central Japan. These rivers are inhabited by unionid freshwater mussels, which are used for oviposition by the endangered Itasenpara bitterling (Acheilognathus longipinnis). Water samples were collected every month between March 2011 and February 2012. Read More

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November 2017