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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 ...
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...
Spatial distributions of biomass and species composition in submerged macrophytes in the southern basin of Lake Biwa in summer of 2002
Lake Biwa southern basin submerged macrophyte biomass species composition
2009/4/2
Spatial distributions of the biomass and species composition in submerged macrophytes in the southern basin of Lake Biwa were surveyed in September, 2002. Macrophyte samples were collected from 52 si...
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...
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...
Morphological variations of a manganese-oxidizing microorganism Metallogenium observed in the developmental process of cultures collected from Lake Biwa waters
Bacteria Fungus Manganese
2009/4/1
Blackish brown particles of manganese oxide usually derived from the microorganism Metallogenium were observed for the first time in November, 2002 at the center of the north basin of Lake Biwa off Im...
Specification of compounds causing white turbidity in Lake Kasumigaura
Lake Kasumigaura suspended solids
2009/4/1
In recent years, a singular phenomenon of white turbid water has often been observed in Lake Kasumigaura and has become a focus of great concern for its impact on the ecosystem. We investigated the ch...
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...
Preliminary report on evaluating the effects of agricultural drainage on phytoplankton growth in Lake Biwa
phytoplankton growth bioassay
2009/4/1
The effects of pesticides and nutrient loading from paddy fields on the growth of natural phytoplankton assemblages collected from Lake Biwa were examined by bioassay using the waters from Lake Biwa, ...
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 ...
Mathematical model analysis was used to explain a regime shift of Takkobu Lake in Hokkaido Japan. In this lake, a catastrophic change occurred several years ago from a clear to a turbid water state. O...
Features of Lake Takkobu ecosystem assessed by natural abundance of 13C and 15N
Kushiro Moor lake ecosystem
2009/4/1
southern part. Seasonally, POM with high δ13C and low δ15N has appeared in summer, whereas the opposite is the case in spring and autumn. Horizontally, the summer POM with both higher δ13C and lower δ...
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 ...
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...