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Impact of changing DOC concentrations on the potential distribution of acid sensitive biota in a boreal stream network
acid sensitive biota potential distribution
2009/4/29
DOC concentrations have increased in many surface waters in Europe and North America over the past few decades. As DOC exudes a strong influence on pH this DOC increase could have detrimental effects ...
Research on red snow ‘Akashibo’ in the Ozegahara mire —Relationships between the vertical distribution of red snow and alga—
red snow Ozegahara mire alga Hemitoma Fe
2009/4/2
The red snow phenomenon called ‘Akashibo’ is usually observed from May to June during the melting snow season in Ozegahara, Japan. The red snow takes its color from the reddish-brown particle about 10...
Japanese Baetidae (Ephemeroptera)：keys to seven genera with information on taxonomy, distribution and habitat
Ephemeroptera Baetidae pictorial tabular key genera monophyletic groups Japan
2009/4/2
The author compiled a pictorial tabular key of male imagoes and nymphs of seven Japanese genera of the family Baetidae (Ephemeroptera), Acentrella Bengtsson, Alainites Waltz and McCafferty, Baetiella ...
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...
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...
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 ...
Distribution and speciation of Fe(II) in the waters of Lake Biwa and inflowing rivers
oxic environment inflowing rivers
2009/4/1
The extraction method of Fe(II)-ferrozine complex was modified to achieve detection of nanomolar concentrations of Fe(II) in freshwaters. This method was applied to investigate the distribution of tra...
Effect of temperature on metabolic rates and horizontal distribution of an endemic amphipod Jesogammarus annandalei in Lake Biwa
horizontal distribution Lake Biwa
2009/4/1
Effects of temperature on survival, respiration and excretion rates of an endemic amphipod species, Jesogammarus annandalei, in Lake Biwa was examined in January, March, May, June and October 2004 in ...
Distribution and present status of fishes in Lake Takkobu and adjacent rivers
distribution species diversity
2009/4/1
The distribution and present status of fishes was investigated in Lake Takkobu and adjacent rivers of the Kushiro Mire from July to October, 2003. Gymnogobius castaneus, Hypomesus olidus and Phoxinus ...
Seasonal changes and horizontal distribution of zooplankton in Lake Takkobu, Kushiro Marsh, Hokkaido
community structure biomass food web
2009/4/1
The occurrence characteristics of zooplankton in Lake Takkobu, a shallow eutrophic lake located in the eastern edge of the Kushiro wetland in Hokkaido, were studies in 2003. In the lake, 17 species of...
Seasonal changes and horizontal distribution of phytoplankton in Lake Takkobu, Kushiro Wetland
eutrophication CCA HCO3
2009/4/1
We investigated the seasonal changes and horizontal distribution of phytoplankton taxa in Lake Takkobu, Hokkaido. A clear seasonal succession appeared in this lake, with the unicellular alga of Chryso...
Water quality and factors influencing its distribution in Lake Takkobu
wetland eutrophication
2009/4/1
Chemical characteristics were investigated using water samples collected at 54 sites in Lake Takkobu and 8 inflow and outlet sites in the summer 2004. Concentrations of 9 elements (Na+, Ca2+, K+, Mg2+...