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Apparent increase in Mn and As accumulation in the surface of sediments in Lake Biwa, Japan, from 1977 to 2009
ake Biwa manganese arsenic temporal variation environmental change
2017/4/11
An apparent temporal increase in Mn and As in a thin surface layer (ca. 2 cm) of sediments in Lake Biwa, Japan, was
observed by comparing depth profile data from 1977 and 2009. By our estimation, sev...
Possible precursor of perylene in sediments of Lake Biwa elucidated by stable carbon isotope composition
Lake Biwa perylene stable carbon isotopic composition sediment
2017/8/9
We determined the stable carbon isotope compositions (δ13C values) of perylene and compounds coexisting with it to elucidate the precursor of perylene in sediments of Lake Biwa. Although we found a hi...
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...
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...
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...
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 ...
Continuous spatial observations of the water quality of Lake Biwa and the Yasu River were conducted during 1997 and 1999.
To sink or to be lysed? Contrasting fate of two large phytoplankton species in Lake Biwa
lysed phytoplankton species
2014/5/5
We estimated the contributions of sedimentation and cell lysis to the loss of two large phytoplankton species
(Fragilaria crotonensis and Staurastrum dorsidentiferum) in Lake Biwa. Major loss process...
Long–term changes in the abundance of Jesogammarus annandalei (Tattersall) in Lake Biwa
Long–term Lake Biwa
2014/5/19
Changes in the abundance of an endemic amphipod, Jesogammarus annandalei, that inhabits the profundal zone
of Lake Biwa were examined from 1966 to 1999. The abundance of J. annandalei increased sudde...
Contribution of absorption and scattering to the attenuation of UV and photosynthetically available radiation in Lake Biwa
absorption and scattering attenuation of UV photosynthetically available radiation Lake Biwa
2014/5/26
Underwater ultraviolet (UV) attenuation is typically modeled using correlative relationships between UV attenuation and dissolved organic carbon (DOC) concentration or colored dissolved organic matter...