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Gammaridean fauna on a red alga Gracilaria asiatica and a green alga Enteromorpha prolifera in a brackish lake, Nakaumi, western Honshu, Japan
Gammaridean fauna Gracilaria asiatica Enteromorpha prolifera Nakaumi brackish lake
2009/4/2
In the year 2002, from May to June and October to December, 10 gammaridean species (in total 3117 individuals belonging to seven families) were collected on a red alga Gracilaria asiatica and a green ...
Occurrence patterns of the gametophyte of Thorea okadae (Rhodophyta) in the Yasumuro River, Kamigori, Hyogo Prefecture, Japan, with special reference to variations in river-water discharge
flood discharge freshwater red alga gametophyte Thorea okadae Yasumuro River
2009/4/2
Thorea okadae, a freshwater red alga (Rhodophyta), was found in the Yasumuro River, Kamigori, Hyogo Prefecture, on January, 2004. Although this species was initially found in 1991, it had not been enc...
Confirmation of surface area of the southern basin of Lake Biwa Japan
southern basin of Lake Biwa surface area
2009/4/2
We confirmed assumptions that had been used in the literatures for calculating the surface area of the southern basin of Lake Biwa. The area of 58 km2 generally use still in had been estimated based u...
Horizontal distribution and natural resource of seagrass in brackish Lake Obuchi, Aomori Prefecture, Japan
brackish Lake Obuchi seagrass Zostera marina Zostera japonica horizontal distribution natural resource
2009/4/2
The horizontal distribution and quantity of natural resources of seagrass (Zostera marina and Zostera japonica) in brackish Lake Obuchi, located in the center of the Shimokita Peninsula in Aomori Pref...
Researches on red snow “Akashibo” in the Ozegahara mire Central Japan: occurrence of invertebrates in red snow “Akashibo”
red snow Ozegahara mire Akashibo Harpactioida invertebrate
2009/4/2
Various invertebrates, nematodes, oligochaetes, harpacticoids, tardigrades, cladocerans, mites, larvae of dipteran insects (tipulids, ceratopogonids and chironomids), appeared internivean and supraniv...
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...
Bispectra and Cross-Bispectra of Temperature, Salinity, Sound Velocity and Density Fluctuations with Depth off Northeastern Japan
Temperature Salinity Sound Velocity Density Fluctuations
2009/4/2
Off northeastern Japan, depth profiles of temperature, salinity, sound velocity and density show considerable structure between 30 and 240 m. The structure is asymmetric with respect to the mean and t...
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。