Factors to determine the functions and structures in natural and constructed tidal flats

Lee, Jeoung gyu; Nishijima, Wataru; Mukai, Tetsuo; Takimoto, Kazuto; Seiki, Tohru; Hiraoka, Kiyonori; Okada, Minoru

doi:10.1016/s0043-1354(98)00013-x

Cited by 45 publications

(17 citation statements)

References 10 publications

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“…Since fine particle content in the sediment was reported to affect the benthos community and bacterial population emerging in the artificial tidal flat (Lee et al, 1998), the size distribution was also expected to affect the larval settlements. Although the previous surveys (Fujimoto et al, 1985;Ueda and Yamashita, 1997) indicated the possible occurrence of the effect of fine particles on the clam larval settlement, conclusions cannot be derived yet due to the containment of particles with various sizes in the real sediment.…”

Section: Introductionmentioning

confidence: 99%

Effect of Silt and Clay on the Settlement of Short-necked Clam Ruditapes philippinarum Larvae

Nakai

Ishii

Okuda

et al. 2012

J. of Wat. & Envir. Tech.

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In this study, we investigated the effect of silt and clay in the sediment on the settlement of Ruditapes philippinarum larvae. Mountain, river and sea sands of which silt and clay (< 0.075 mm) content was adjusted using silt and clay originating from these sands or dredged sediment (DS) were examined for settlement of R. philippinarum larvae. The addition of DS and Otagawa river sand-originated silt and clay did not accelerate the larval settlement, whereas the mountain and Jigozen sea sands-originated silt and clay promoted larval settlement at 5%. The negative impact of Otagawa river sand-originated silt and clay might be due to its high leachability of Mn, while the accelerated larval settlement by Jigozen sea sands-originated silt and clay could be attributed to its organic contents. The provided results indicate that a suitable ratio of the fine particles to coarse particles exists for the acceleration of the larval settlement, though the effect might be dependent on their chemical properties.Keywords: larval settlement, restoration, Ruditapes philippinarum, silt and clay, tidal flat INTRODUCTION Short-necked clam (Ruditapes philippinarum) resources in Japan have been decreasing for decades. To maintain the clam production, cultivated young short-necked clams have been transplanted to clam fishery areas. As for the causes of decrease in short-necked clam resources, deterioration of the sediment environment and decrease in number of their larvae in seawater were reported (Ishii et al., 2001;Sekiguchi and Ishii, 2003). Therefore, restoration of the sediment environment is an important task to reestablish clam habitats for the natural recovery of short-necked clam resources.

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Section: Introductionmentioning

confidence: 99%

Effect of Silt and Clay on the Settlement of Short-necked Clam Ruditapes philippinarum Larvae

Nakai

Ishii

Okuda

et al. 2012

J. of Wat. & Envir. Tech.

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“…Because such useful functions have highlighted the importance of tidal flats, in 2003 the Japanese government enacted a law for the promotion of nature restoration, which charges those engaged in development activities in coastal areas with mitigation of damage to or lost of tidal flats. Hosokawa, 1997;Lee et al, 1997;Lee et al, 1998). However, surveys in Hiroshima Bay showed that many of the artificial tidal flats did not have the same physicochemical and biological structures as natural tidal flats, and that silt accumulation in the sediment is a key parameter for the creation of a natural-like artificial tidal flat (Lee et al, 1997;Lee et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…Hosokawa, 1997;Lee et al, 1997;Lee et al, 1998). However, surveys in Hiroshima Bay showed that many of the artificial tidal flats did not have the same physicochemical and biological structures as natural tidal flats, and that silt accumulation in the sediment is a key parameter for the creation of a natural-like artificial tidal flat (Lee et al, 1997;Lee et al, 1998). Bolam and Whomersley (2005) reported a significant relationship between silt and clay content and number of macrobenthos species in the constructed mudflats.…”

Section: Introductionmentioning

confidence: 99%

“…The basement material would be covered with sandy media such as mountain or sea sands. However, compared with natural tidal flats, the biota appearing in the artificial tidal flats constructed by such a method was often poor because of low silt (particles with diameter less than 75 µm) content (Lee et al, 1998). Generally, DS mostly consists of silt and contains abundant nutrients, such as organic matter, nitrogen, and phosphorus (Bruland et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Dredged Sediment as a Silt and Clay Source for Artificial Tidal Flats

Nakai

Imai

Ishii

et al. 2009

J. of Wat. & Envir. Tech.

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This research was carried out to investigate the feasibility of using dredged sediment (DS) as the additive of silt and clay for artificial tidal flats. A series of experiments conducted in the real seashore and in a tidal flat simulator demonstrated that DS could be used for artificial tidal flats. Furthermore, the tidal flat simulator experiment showed that the macrobenthos population increased with the DS addition. However, use of conditioners made of paper sludge and poly-aluminum chloride for DS granulation treatment was associated with a time lag in the growth of the macrobenthos: these agents may be released during the course of the experimental period. Possible reasons for the increased polychaete and gastropod abundances in the artificial tidal flats might be an increase in supplied organic matter and stimulated benthic microalgae growth due to the DS addition. Finally, a growth test was carried out for the short neck clam Ruditapes philippinarum, which showed that it can grow in artificial tidal flats to which DS has been added. Too much DS, however, may suppress its growth.Keywords: artificial tidal flat, benthic ecosystem, dredged sediment. INTRODUCTIONIn the 1940s, the total area of natural tidal flats in Japan was approximately 82,600 ha. By the 1980s, however, about 40% had unfortunately disappeared (Kimura, 1994). In recent years, useful functions of tidal flats such as biological production, water quality clarification and recreation have been recognized more and more (Miyoshi et al., 1991;Kimura et al., 1992;Imamura, 1997;Evans et al., 1998;Ishii et al., 2001;Morrison et al., 2002;Tiner et al., 2003;Sakamaki et al., 2006;Magni and Montani, 2006). For example, Kimura et al., (1992) compared water quality at the seashore where an artificial tidal flat existed, and its offing region. They found that COD in the seashore was significantly lower than that in the offing region. This difference in the water quality in the investigated area was accounted for by increased capability of the artificial tidal flats for degrading organic matter. Benthic organisms have been investigated as the cause of the water clarification capability of artificial and natural tidal flats (Miyoshi et al., 1991, Imamura, 1997. Because such useful functions have highlighted the importance of tidal flats, in 2003 the Japanese government enacted a law for the promotion of nature restoration, which charges those engaged in development activities in coastal areas with mitigation of damage to or lost of tidal flats.

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“…하지만 Middelburg et al(1996)는 강 하구 갯벌에서 측정한 퇴적물 내 미생물 활동과 퇴적물의 유기물 농도는 관련이 없다고 보고하였다. 퇴적물의 총 유기물 양보다 유기물 중 미생물이 분해하기 쉬운 유기물(labile) 의 비중, 즉 유기물의 질이 미생물 활동에 더 중요함을 제시하였 다 (Lee et al, 1998;Herbert, 1999). (Fig.…”

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Seasonal Variation of Nitrogen Loads and Nitrogen Cycling at Tidal Flat Sediments in Nakdong River Estuary

Lee

Kwon²,

2012

The Sea

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) in this study was higher compared to the other Korean coast measured with the same method. Denitrification showed the same seasonal variation as oxygen fluxes. Denitrification rate based on 15 N-nitrate showed a strong correlation with nitrate flux into the sediments from the overlying water. Denitrification via "water column supplied nitrate (D w )", calculated from Isotope pairing technique, also correlated well with nitrate flux into the sediments. Nitrate from water column seems to account for seasonal variation of denitrification in Nakdong River Estuary. To understand general patterns and trends of biogeochemical processes of sediments in the Nakdong River Estuary, we categorized biogeochemical fluxes measured in this study according to direction and sizes of fluxes. Type 1(high oxygen and inorganic nitrogen fluxes into the sediments and high denitrification) occurred in summer, whereas Type 2(low oxygen and inorganic nitrogen fluxes into the sediments and low denitrification) occurred in rest of the season. Intertidal flat sediments seem to react sensitively to influence of freshwater from the Nakdong River.

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Factors to determine the functions and structures in natural and constructed tidal flats

Cited by 45 publications

References 10 publications

Effect of Silt and Clay on the Settlement of Short-necked Clam Ruditapes philippinarum Larvae

Effect of Silt and Clay on the Settlement of Short-necked Clam Ruditapes philippinarum Larvae

Evaluation of Dredged Sediment as a Silt and Clay Source for Artificial Tidal Flats

Seasonal Variation of Nitrogen Loads and Nitrogen Cycling at Tidal Flat Sediments in Nakdong River Estuary

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