210Pb geochronology of sediments from Lake Shinji.

Matsumoto, Eiji

doi:10.2343/geochemj.9.167

Cited by 62 publications

(18 citation statements)

References 7 publications

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“…Matsumoto, 1975 ;Bruland et al, 1975 ;Robbins et a!., 1977 ;Robbins 1980 ;Smol & Dickman, 1981) . To further minimize the possibility of surface disturbances, Robbins et al (1977) and Bruland et al (1975) did not equip their corers with a cutter assembly.…”

Section: Introductionmentioning

confidence: 99%

A comparison of lead and zinc sediment profiles from cores taken by diver and a gravity corer

Evans

Lasenby

1984

Hydrobiologia

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The zinc and lead concentrations were compared in several pairs of sediment cores obtained with a modified K-B corer and by Scuba diver from Coon Lake, Canada . A slow approach to and penetration of the sediments (ca . 0 .1 m s-1 ) was employed for both coring devices . The modified K-B corer gave similar lead and zinc profiles to the diver cores . The divers observed that the K-B corer caused no disturbance of the surface sediment layers as it approached and entered the sediments . These results suggest that the K-B corer is suitable for use in lake studies requiring short, undisturbed cores from fine-grained sediments .

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Section: Introductionmentioning

confidence: 99%

A comparison of lead and zinc sediment profiles from cores taken by diver and a gravity corer

Evans

Lasenby

1984

Hydrobiologia

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“…The 210 Pb chronology was applied to the cores using the model of Matsumoto (1975), in which core depth is corrected for sediment compaction (Yasuhara and Yamazaki 2005). We also employed a geochronology based upon fallout of the fission product 137 Cs from the stratosphere, where it was introduced by nuclear weapons testing.…”

Section: Chronologymentioning

confidence: 99%

The effect of long‐term spatiotemporal variations in urbanization‐induced eutrophication on a benthic ecosystem, Osaka Bay, Japan

Yasuhara

Yamazaki

Tsujimoto

et al. 2007

Limnology & Oceanography

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Detailed spatiotemporal patterns of the influence of urbanization-induced eutrophication on a metazoan benthic community in Osaka Bay were determined using sediment cores and fossil ostracode assemblages from the last 200 yr. Results suggest that total abundance of ostracodes increased in the middle part of the bay as a result of the increase of food supply by eutrophication. Conversely, abundance decreased in the inner bay, likely because of bottom-water hypoxia by eutrophication. The variation in species composition among sites within the bay may have decreased because of the effect of eutrophication, i.e., the dominance of species that prefer food-rich environments throughout all sites. These eutrophication-induced changes occurred around 1900 as a result of Japan's industrial revolution and around 1960 as a result of rapid urbanization, depending upon location.Anthropogenic eutrophication and resulting hypoxia in coastal shallow marine environments has been recognized as a significant problem and intensely researched both over time and in many places (e.g., Boesch et al. 2001;Kemp et al. 2005). Furthermore, their effect on organisms is well recognized from both living organisms and commercial catch data on living resources (e.g., Diaz and Rosenberg 1995; Cloern 2001; Grall and Chauvaud 2002 for metazoan benthic community). Although monitoring studies relate how urbanization-induced eutrophication can influence the metazoan benthic community, long-term (the past 200 yr) records of effects of eutrophication and hypoxia on metazoan benthos are unavailable because of the short time periods covered by most monitoring records.Long-term records are available from well-dated sediment cores containing faunal or floral proxies of past ecosystem conditions (Cooper 1995;Karlsen et al. 2000;McGann et al. 2003;Willard et al. 2003). Ostracoda (Crustacea) have been shown to be a useful metazoan group abundantly fossilized in bay sediments, thus allowing robust faunal analysis in sediment cores (Cronin and Vann 2003). Many ostracode species are sensitive to anthropogenic activities (Ruiz et al. 2005). While several studies using fossil ostracodes to investigate long-term anthropogenic effects are available (Alvarez Zarikian et al. 2000;Cronin and Vann 2003;Yasuhara and Yamazaki 2005), the long-term spatiotemporal variation of anthropogenic effect including eutrophication is known only in a few coastal ecosystems (Ruiz et al. 1997;Yasuhara et al. 2003).Osaka Bay is adjacent to Osaka City, one of the largest metropolitan areas in Japan. Eutrophication is a serious environmental concern because of the great amount of urban wastewater flowing into the bay (ANSIOB 1996). In order to better understand the effects of urbanizationinduced eutrophication on a metazoan benthic community, we studied the long-term temporal changes in geographic distribution of ostracode abundance, species diversity, and faunal composition in Osaka Bay. Geographic and environmental settings of Osaka BayOsaka Bay is an elliptical embayment (,60 km ...

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“…The result of 210 Pb in sediments for chronology was shown with water content in Figure 2. Since the sediment porosity decreased with depth due to compaction, we corrected the depth of the core from water content by using models provided by Robbins and Edgington (1975) and Matsumoto (1975). The activity of 210 Pb ex decayed at a constant rate and the deposition age was calculated from a half life of 210 Pb.…”

Section: Chronologymentioning

confidence: 99%

Method for the Estimation of the Past Illegal Dumping Recorded in a Sediment Core

Katahira

Ishitake

Moriwaki

et al. 2006

Water Air Soil Pollut

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Heavy metal concentrations of the acidsoluble fraction in sediment core samples from Nagaike, a reservoir in Osaka City, Japan, were measured by ICP-MS following the microwave extraction method. Spiked peaks for several metals in the sediment core samples were observed around 1960. The results of correlation coefficient study and cluster analysis of heavy metal concentrations in the sediment core samples showed that some metals, such as Cr, Cd, Ni and Cu, in the period of the spiked peak were derived from the different emission sources from other periods. These metals are often used for metal plating, and it was concluded that the spiked peaks were caused by illegal effluent from the metal plating industry. The load amounts of heavy metals by illegal dumping were calculated and the magnitude of the pollution was estimated.

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210Pb geochronology of sediments from Lake Shinji.

Cited by 62 publications

References 7 publications

A comparison of lead and zinc sediment profiles from cores taken by diver and a gravity corer

A comparison of lead and zinc sediment profiles from cores taken by diver and a gravity corer

The effect of long‐term spatiotemporal variations in urbanization‐induced eutrophication on a benthic ecosystem, Osaka Bay, Japan

Method for the Estimation of the Past Illegal Dumping Recorded in a Sediment Core

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