U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PubAg

Main content area

You searched for: Source 2019 v.44 no.1 Remove constraint Source: 2019 v.44 no.1 Subject term rivers Remove constraint Subject term: rivers
Start Over

Search

11  Search Results

1 - 11 of 11
Number of results to display per page

Search Results

1. A New Species of Trillium (Melanthiaceae) from Central Georgia and its Phylogenetic Position in Subgenus Sessilium

Author:
Edward E. Schilling; Aaron Floden; Jayne Lampley; Thomas S. Patrick; Susan B. Farmer
Source:
Systematic botany 2019 v.44 no.1 pp. 107-114
ISSN:
0363-6445
Subject:
Trillium; floodplains; flowers; forests; new species; odors; phylogeny; plant taxonomy; rare species; rivers; stems; swine; Georgia
Abstract:
... Analysis of molecular phylogenetic data was used to reveal the existence of a novel species of Trillium subgen. Sessilium. Trillium delicatum sp. nov. differs from the two other low-growing species of the subgenus, T. decumbens and T. reliquum, in features such as straight stems and dung-scented flowers. It occurs in wet floodplain forests in the Oconee and Ocmulgee river drainages in central Geor ...
DOI:
10.1600/036364419X697958

2. A Revision of Cuphea Section Amazoniana s. s. (Lythraceae)

Author:
Shirley A. Graham
Source:
Systematic botany 2019 v.44 no.1 pp. 146-183
ISSN:
0363-6445
Subject:
plant taxonomy; pollen; montane forests; savannas; new species; seed morphology; Cuphea; leaves; shrublands; temperate zones; monophyly; cold; Ventenata; rivers; trichomes; flowers; Guyana; Colombia; Ecuador; Brazil; Venezuela; French Guiana
Abstract:
... Cuphea section Amazoniana, one of 13 sections in Cuphea, comprises 20 species, mostly narrow endemics in Colombia, Ecuador, and the Guiana Shield region of Venezuela, Guyana, French Guiana, and Brazil. The species inhabit river margins, tepuis, scrubland, savanna, and low montane forests in tropical to cold temperate climates. They are subshrubs defined by the common presence of a strigose indumen ...
DOI:
10.1600/036364419X697994

3. A review of simulated climate change impacts on groundwater resources in Eastern Canada

Author:
Marie Larocque; Jana Levison; Alexandre Martin; Diane Chaumont
Source:
Canadian water resources journal 2019 v.44 no.1 pp. 22-41
ISSN:
1918-1817
Subject:
climate change; climate models; ecosystems; groundwater; groundwater recharge; rivers; rural areas; snowmelt; stakeholders; summer; urban population; water management; water supply; New Brunswick; Nova Scotia; Ontario; Prince Edward Island; Quebec
Abstract:
... In Eastern Canada, groundwater is the main water supply for most of the rural regions and in many large urban communities. An understanding of the impacts of climate change on this resource is crucial for sustainable water management in this region. The objectives of this paper was to summarize the state of knowledge about possible climate change impacts on groundwater dynamics in Eastern Canada, ...
DOI:
10.1080/07011784.2018.1503066

4. An examination of the long-term relationship between hydrologic variables and summer algal biomass in a large Prairie reservoir

Author:
Oghenemise Abirhire; Kristine Hunter; John-Mark Davies; Xulin Guo; Dirk de Boer; Jeff Hudson
Source:
Canadian water resources journal 2019 v.44 no.1 pp. 79-89
ISSN:
1918-1817
Subject:
Landsat; algae; basins; biomass; chlorophyll; drought; historical records; hydrologic data; hydrologic factors; lakes; pollution load; prairies; rivers; spring; summer; temperature; Rocky Mountain region; Saskatchewan
Abstract:
... Hydrological drought as characterized by low river inflow rate (IR), and, in turn, low water level (WL) and greater water residence time (WRT), may support greater algal biomass and blooms in lakes. Lake Diefenbaker (LD), a large mesotrophic reservoir on the Canadian Prairies, receives ∼98% of its inflow from the South Saskatchewan River (SSR). The SSR annual flow volume largely varies with precip ...
DOI:
10.1080/07011784.2018.1531064

5. How Does the Japanese Water Shrew Chimarrogale platycephalus Cross the Concrete Walls of Check Dams?

Author:
Hiroaki Saito; Hiroshi Hashimoto; Teruaki Hino; Masaharu Motokawa
Source:
Mammal study 2019 v.44 no.1 pp. 1-11
ISSN:
1348-6160
Subject:
concrete; dams (hydrology); rivers; sediments; shrews; streams; surveys; Japan
Abstract:
... The concrete walls of check dams are considered a physical barrier for aquatic and semiaquatic animals that inhabit mountain streams. Traveling behaviors around concrete check dams by the Japanese water shrew Chimarrogale platycephalus, a semi-aquatic mammal, were directly observed via radio-tracking in Kamikoshi Stream in central Honshu, Japan. Traveling behaviors were mainly observed on the wet ...
DOI:
10.3106/ms2017-0056

6. Modelling expected trout ranges under current and future water temperature regimes in the Eastern Cape, South Africa

Author:
NA Rivers-Moore; BR Ellender; OLF Weyl
Source:
African journal of aquatic science 2019 v.44 no.1 pp. 35-42
ISSN:
1727-9364
Subject:
Oncorhynchus mykiss; Salmo trutta; cold; digital elevation models; habitats; probability; rivers; sport fishing; trout; water; water temperature; South Africa
Abstract:
... Different values have resulted in conflicts between anglers and conservation lobbies in the management of trout in South Africa. Key to the conflict is the demarcation of boundaries to areas in which brown trout Salmo trutta and rainbow trout Oncorhynchus mykiss currently occur, or are likely to establish following stocking for angling. To provide a longer-term perspective on these areas, we devel ...
DOI:
10.2989/16085914.2019.1590684

7. Ovarian activity and plasma sex steroid levels of Distichodus antonii in relation to environmental conditions in the upper basin of the Congo River

Author:
JS Osombause; SNM Mandiki; JA-P Ulyel; J-C Micha; P Kestemont
Source:
African journal of aquatic science 2019 v.44 no.1 pp. 61-70
ISSN:
1727-9364
Subject:
Distichodus; adults; basins; body weight; breeding season; environmental factors; females; fish; indigenous species; oocytes; oogenesis; overfishing; rain; rivers; sex hormones; spawning; temperature; watersheds; wet season
Abstract:
... Distichodus antonii is an endemic fish species of the Congo River basin in which the stocks of wild populations are threatened by overfishing pressure. Knowledge of its reproductive biology would be useful in consideration of conservation and management options for the species. Therefore, this study investigated changes in ovarian activity and levels of steroid profiles in wild populations in rela ...
DOI:
10.2989/16085914.2018.1555511

8. Phylogenetic relationships and convergent evolution of ocean‐shore ground beetles (Coleoptera: Carabidae: Trechinae: Bembidion and relatives)

Author:
David R. Maddison; Munetoshi Maruyama
Source:
Systematic entomology 2019 v.44 no.1 pp. 39-60
ISSN:
0307-6970
Subject:
Amphipoda; Bembidion; adults; ancestry; convergent evolution; elytra; genes; genetic similarity; gravel; habitats; littoral zone; phylogeny; rivers; Arctic region
Abstract:
... Through phylogenetic analysis of seven genes, we show that there have been at least six independent entries into intertidal habitats in the history of bembidiine carabids, in the ancestors of: (i) Orzolina Machado, (ii) Bembidion (Desarmatocillenus Netolitzky), (iii) Bembidion laticeps (LeConte) + palosverdes Kavanaugh & Erwin, (iv) Bembidion laterale (Samouelle), (v) Bembidion umi Sasakawa and Be ...
DOI:
10.1111/syen.12307

9. Seasonal occurrence and ecological aspects of Afrodiplozoon polycotyleus (Monogenea: Diplozoidae) from the gills of three cyprinids from the Nwanedi-Luphephe dams, South Africa

Author:
EM Mbokane; J Theron; WJ Luus-Powell
Source:
African journal of aquatic science 2019 v.44 no.1 pp. 53-60
ISSN:
1727-9364
Subject:
Enteromius; Labeobarbus; Monogenea; adults; autumn; dams (hydrology); fish; food availability; gills; habitat preferences; hosts; new host records; parasites; rivers; seasonal variation; spring; summer; water quality; South Africa
Abstract:
... The effect of seasonal changes and ecological aspects of Afrodiplozoon polycotyleus (Paperna, 1973) collected on Labeobarbus marequensis (Smith, 1841), Enteromius trimaculatus (Peters, 1852) and Enteromius radiatus (Peters, 1853) was investigated from January to October 2008. Fish were collected at the Nwanedi-Luphephe dams, Limpopo River System, South Africa using gill, cast and seine nets and el ...
DOI:
10.2989/16085914.2018.1555513

10. Sediment-associated organopollutants, metals and nutrients in the Nechako River, British Columbia: a current study with a synthesis of historical data

Author:
Philip N. Owens; David J. Gateuille; Ellen L. Petticrew; Barry P. Booth; Todd D. French
Source:
Canadian water resources journal 2019 v.44 no.1 pp. 42-64
ISSN:
1918-1817
Subject:
Acipenser transmontanus; DDE (pesticide); Oncorhynchus nerka; Oncorhynchus tshawytscha; anadromous fish; arsenic; endangered species; furans; guidelines; habitats; herbicides; hexachlorobenzene; metals; nitrogen; nutrient content; nutrients; polybrominated diphenyl ethers; polychlorinated biphenyls; polychlorinated dibenzodioxins; polychlorinated dibenzofurans; polycyclic aromatic hydrocarbons; rivers; sediment texture; suspended sediment; watersheds; British Columbia
Abstract:
... The flow-diverted Nechako River is the second largest tributary of the Fraser River which drains 25% of mainland British Columbia, Canada. The watershed provides critical reproductive habitats for anadromous chinook salmon (Oncorhynchus tshawytscha) and sockeye salmon (O. nerka) and year-round habitat for the endangered Nechako white sturgeon (Acipenser transmontanus) population. In this study, th ...
DOI:
10.1080/07011784.2018.1531063

11. The attitudes of riparian communities to the presence of water hyacinth in the Wouri River Basin, Douala, Cameroon

Author:
SN Kenfack Voukeng; P Weyl; MP Hill; N Chi
Source:
African journal of aquatic science 2019 v.44 no.1 pp. 7-13
ISSN:
1727-9364
Subject:
Eichhornia crassipes; attitudes and opinions; control methods; fish; income; qualitative analysis; rivers; sand; socioeconomics; surveys; villages; watersheds; weeds; Cameroon
Abstract:
... Since publication of the first record of Eichhornia crassipes in Cameroon in 1997, the weed has become highly invasive in the Wouri River Basin. Between June and September 2014, a socio-economic survey using participatory and qualitative methods was undertaken in the riparian villages of the Wouri River Basin to assess the perception of respondents to the presence of water hyacinth. The survey rev ...
DOI:
10.2989/16085914.2018.1538868