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Relationship between dissolved oxygen concentration of bottom water and macrophyte biomass in the southern basin of Lake Biwa, Japan
dissolved oxygen submerged macrophyte southern basin of Lake Biwa
2009/4/2
The horizontal distribution of dissolved oxygen (DO) concentrations on the lake bottom was investigated on September 2-5, 2002. At 36 out of the 84 sites, DO concentrations were at less than 50% of sa...
Rare earth element geochemistry in acid river water from the Numajiri drainage system, Fukushima Prefecture, Japan
Kerare earth elements hot spring ICP-MS geochemistry Numajiri
2009/4/2
Acid river water samples collected from the Numajiri drainage system, Fukushima Prefecture, Japan, were analyzed for rare earth elements (REE) and major chemical components to elucidate the origin and...
Features and sources of organic components in surface sediments of Lake Nishi-inbanuma in Chiba Prefecture, Japan
eutrophic lake Lake Nishi-inbanuma organic constituents surface sediment
2009/4/2
Lake Nishi-Inbanuma (area 680 ha, average depth 1.8 m) in northwest Chiba Prefecture, Japan, is known as a typical eutrophic lake. We studied organic components in the surface sediments (0-5 cm) of th...
The present distribution and issues regarding the control of the exotic snail Potamopyrgus antipodarum in Japan
distribution vector
2009/4/1
The New Zealand mudsnail Potamopyrgus antipodarum is now on record from 15 prefectures of Japan, including the Hokkaido, Honshu and Kyushu islands. Due to its invasiveness, this species should be care...
Distribution of exotic branchiobdellidans (Annelida, Clitellata) in Japan
Sathodrilus Xironogiton
2009/4/1
Four exotic species of branchiobdellidans (Annelida: Clitellata) have so far been unintentionally introduced into Japan, in accordance with introduction of host crayfishes or shrimps from abroad. Thre...
Distribution and control status of the invasive signal crayfish (Pacifastacus leniusculus) in Japan
Invasive Alien Species Act signal crayfish
2009/4/1
On 1 February 2006, the American signal crayfish Pacifastacus leniusculus together with another American crayfish (Orconectes rusticus), Cherax (native to Australasia) and Astacus (native to Europe) w...
A total of 8 species of exotic planarians (5 families, 2 subfamilies, 6 genera) are now known from Japan. They are: Dugesia austroasiatica Kawakatsu, 1985; Girardia tigrina (Girard, 1850); Girardia do...
Distribution of an alien species, Crangonyx floridanus Bousfield (Crustacea: Amphipoda: Crangonyctidae) in Japan
Crangonyx floridanus alien species
2009/4/1
The crangonyctid amphipod, Crangonyx floridanus, originating from North America, has invaded the freshwaters of Japan. Based on specimens and the literature, C. floridanus was recorded in 28 Japanese ...
Present status of exotic freshwater benthic macro-invertebrates and challenges for their control in Japan
macro-invertebrates Japan
2009/4/1
Present status of exotic freshwater benthic macro-invertebrates and challenges for their control in Japan。
Trichoptera fauna of the Kushiro Marsh, northern Japan, with particular references to the fauna of Lake Takkobu
the Kushiro Marsh Japan.
2009/4/1
2003-2006, the Trichoptera fauna of the Kushiro Marsh was studied in Lake Takkobu, Hokkaido, northern Japan, using chemical light, black light, Malaise trap and insect net. Adults of 52 species belong...
Change in macrophytic flora of Lake Takkobu, Kushiro, Japan, in past 30 years
aquatic macrophyte decline eutrophication
2009/4/1
The change in macrophytic flora in Lake Takkobu since the mid-1970s was briefly described. At that period floating-leaved plant communities dominated by species such as Nuphar pumila and Potamogeton n...
Predominance of Stenopsyche marmorata Navas larvae immediately downstream of Iwaonai Dam in the Teshio River, Hokkaido, Japan
dam reservoir
2009/4/1
We examined the density of aquatic invertebrates downstream from Iwaonai Dam in the upper reach of the Teshio River, Hokkaido.
Statistical atmospheric downscaling for rainfall estimation in Kyushu Island, Japan
atmospheric downscaling precipitation rainfall
2009/3/23
The present paper develops linear regression models based on singular value decomposition (SVD) with the aim of downscaling atmospheric variables statistically to estimate average rainfall in the Chik...
Simultaneous monitoring of gas concentration and groundwater level at the Omaezaki 500-m well, central Japan: Spike-like concentration change of methane
groundwater continuous monitoring quadrupole mass spectrometer methane concentration change
2017/8/10
Simultaneous monitoring of the gas concentration and water level in groundwater was achieved at the Omaezaki open well. Coaxially arranged pipes inserted into the well enabled us to pump groundwater d...