Distributions of pH and chemical components in Mizorogaike, a pond with a floating-mat bog

Koshikawa, Masami Kanao; Fujita, Noboru; Sugiyama, Masahito; Hori, Toshitaka

doi:10.1007/s10201-004-0137-2

Cited by 5 publications

(9 citation statements)

References 17 publications

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“…However, this pond experienced eutrophication by sewage and tap water introduction in the 1960-1970s (Shimamura et al 2006b). The average pH values in Mizorogaike Pond varied by -0.2 to ?0.5 pH units between 1928 and 1994 (Koshikawa et al 2005). Historically, any degradation of the floating mat bog was likely caused by eutrophication of the pond water, e.g., via tap water released from the southeast water inlet, drainage water from the hospital, and pollution via surface runoff from the northern road (Scientific Research Group of Mizorogaike Pond 1981a; Takamura and Takemon 2005;Shimamura et al 2006b).…”

Section: History Of Eutrophicationmentioning

confidence: 97%

“…8-ha small pond (maximum water depth 2 m) located in the city of Kyoto (136°46 0 E, 35°03 0 N, 75 m in elevation), with ca. 3 ha of floating mat bog (Shimizu 1986;Haraguchi 1992;Koshikawa et al 2005). Miki (1929) reported the distribution and species composition of vegetation in the pond and on its floating mat for the first time.…”

Section: Study Areamentioning

confidence: 99%

“…In addition, the changes over the 13-year period from 1964 to 1977 were so drastic that many small hummocks had disappeared (Scientific Research Group of Mizorogaike Pond 1981a). However, anthropogenic nutrient loading in the area has recently been reduced (Takamura and Takemon 2005), and the total P (an index of eutrophication) has decreased since the 1980s (Koshikawa et al 2005). Thus, the floating mat bog in Mizorogaike Pond is a suitable study site for examining regime shifts.…”

Section: Introductionmentioning

confidence: 99%

“…8 ha) with floating mat bogs (area ca. 3 ha) located in an urban area on the northern part of Kyoto Basin, central Japan (136°46 0 E, 35°03 0 N, 75 m in elevation ;Shimizu 1986;Haraguchi 1992;Koshikawa et al 2005). Miki (1929) noted that this floating mat was oligotrophic and entirely covered with Sphagnum bog.…”

Section: Introductionmentioning

confidence: 99%

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Restoration of floating mat bog vegetation after eutrophication damages by improving water quality in a small pond

et al. 2010

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We studied vegetation changes in a small floating mat bog in Mizorogaike Pond (Kyoto, Japan), which had experienced a severe decrease in the number and area of hummocks caused by nutrient loading in the 1960s and 1970s, to examine whether reducing the extent of nutrient loading can restore degraded wetland vegetation. However, nutrient loading in the region has been minimized since the 1980s. We examined the distributions of hummocks and Sphagnum cuspidatum mats in 1980, 1988, and 2006, as well as nine major vascular plants that dominated the hollows on the floating mat in 1980 and 2006. The total area of normal hummocks formed by Sphagnum palustre increased from 5865.3 m 2 in 1980 to 5913.6 m 2 in 1988 and 8485.2 m 2 in 2006. The total area of the S. cuspidatum mats also changed, from 416.4 m 2 in 1980 to 322.3 m 2 in 1988 and 1012.5 m 2 in 2006. Examination of the spatial distribution patterns of major plants revealed that emergent plants decreased in the northern part of the mat, but increased in the southern part.Thus, the improved pond water quality was effective at restoring hummocks, although nutrient loading may have caused some irreversible changes in the wetland vegetation.

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Section: History Of Eutrophicationmentioning

confidence: 97%

Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Restoration of floating mat bog vegetation after eutrophication damages by improving water quality in a small pond

et al. 2010

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“…This suggests that the dynamics of D-Fe in the canal depend upon the cycle of adsorptive removal to the surface of SS at high pH and desorptive supply from the surface of SS at low pH. Koshikawa et al (2005) also reported that the concentrations of Al, Fe, Aquat. Sci.…”

Section: Factors Of Short-term Temporal Variations In Dissolved Iron mentioning

confidence: 98%

Short-term temporal variations in iron concentration and speciation in a canal during a summer algal bloom

et al. 2008

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We conducted field investigations in a canal connected to Lake Kasumigaura (Japan) twice weekly during a summer algal bloom to understand the temporal variations in dissolved iron and its speciation, and the controlling factors. Dissolved iron (DFe), which is operationally defined as that passing through a 0.2-mm pore filter, acid-labile particulate iron (LP-Fe), and chemical speciation of dissolved iron were analyzed. LP-Fe was extracted from the suspended solids (SS) on 0.2-mm pore-size filters after a 2 h soak in 25 % (4.5 M) acetic acid. The chemical speciation of dissolved iron was determined using cathodic stripping voltammetry. The concentration of D-Fe ranged from 72 to 1354 nM and that of filterable labile iron (FL-Fe) from 5 to 881 nM, and both increased markedly after two heavy rains. The increased D-Fe and FL-Fe appeared to be removed within a few days. The concentrations of LP-Fe ranged from 4.1 to 16.1 mM, were much higher than those of D-Fe, and did not increase after the rains. There was a significant correlation (jrj = 0.88, P < 0.01) between ln[D-Fe] and pH. This suggests that the dynamics of D-Fe in the canal depend upon the cycle of adsorptive removal onto the surface of SS at high pH and desorptive supply from the surface of SS at low pH. Moreover, D-Fe concentration would also be controlled by the formation of iron oxyhydroxides amorphous particles at high pH and dissolution at low pH. The percentage of organically complexed iron ranged from 35 % to 99 % and varied markedly at time scales of days to weeks. There was a significant correlation (jrj = 0.60, P < 0.01) between the percentage of organically complexed iron and the log of the cell density of Microcystis spp.. This suggests that the growth of specific algal species affects iron speciation in the canal.

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The role of spatial and temporal variations in habitat uses and food habits of larvae in persistent occurrence of multiple odonate species in Mizorogaike Pond, Kyoto, Japan

et al. 2018

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Distributions of pH and chemical components in Mizorogaike, a pond with a floating-mat bog

Cited by 5 publications

References 17 publications

Restoration of floating mat bog vegetation after eutrophication damages by improving water quality in a small pond

Restoration of floating mat bog vegetation after eutrophication damages by improving water quality in a small pond

Short-term temporal variations in iron concentration and speciation in a canal during a summer algal bloom

The role of spatial and temporal variations in habitat uses and food habits of larvae in persistent occurrence of multiple odonate species in Mizorogaike Pond, Kyoto, Japan

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