Migration of Japanese temperate bass Lateolabrax japonicus juveniles within the Chikugo River estuary revealed by δ13C analysis

Suzuki, Keita W.; Kasai, Atsushi; Ohta, Taro; Nakayama, Kouji; Tanaka, Masaru

doi:10.3354/meps07300

Cited by 22 publications

(20 citation statements)

References 20 publications

(41 reference statements)

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“…Therefore the benefits of the ETM could be utilized only by species that have a preference (or tolerance) for both high turbidity and low salinity. In this context, many of semi-endemic species of the Ariake Sea would be specialists in the ETM, i.e., species that depend on the ETM for population maintenance (e.g., Coilia nasus, Takita 1967a, b; Sinocalanus sinensis, Ueda et al 2004Ueda et al , 2010; Hyperacanthomysis longirostris, Suzuki et al 2008Suzuki et al , 2009a. In general, these species are considered to be continental relicts that were derived from the isolation of the Japanese archipelago from the Eurasian continent by marine transgressions during geological history (Sato and Takita 2000).…”

Section: Implications For Estuarine Organismsmentioning

confidence: 99%

“…The ETM fundamentally differs from simple loading of allochthonous sediments in that the ETM autochthonously develops through the hydrodynamic function of tidal pumping and estuarine circulation (Allen et al 1980;Uncles et al 2002). In addition, the ETM has often been associated with high densities of larval and juvenile fish as well as zooplankton (e.g., St. Lawrence River, Dauvin and Dodson 1990;Laprise and Dodson 1994;Chesapeake Bay, North andHoude 2001, 2003;Chikugo River, Hibino et al 1999;Suzuki et al 2008Suzuki et al , 2009a. Paradoxically, high turbidity sometimes diminishes light availability for photosynthesis so severely that phytoplankton production alone cannot satisfy the demands of secondary producers in the ETM (David et al 2006).…”

Section: Introductionmentioning

confidence: 96%

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Year-round accumulation of particulate organic matter in the estuarine turbidity maximum: comparative observations in three macrotidal estuaries (Chikugo, Midori, and Kuma Rivers), southwestern Japan

et al. 2012

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The inner part of the Ariake Sea is one of the most productive estuarine systems in Japan. To examine potential food items for estuarine organisms, we conducted monthly observations of the dynamics of particulate organic matter along the macrotidal Chikugo River estuary in 2005 and 2006. In the neighboring macrotidal Midori and Kuma River estuaries, comparative observations were made. High turbidity and strong vertical mixing were observed only at low salinities (\10) in the Chikugo River estuary. In contrast, the Midori and Kuma River estuaries were characterized by less turbid and less mixed waters. Concentrations of particulate organic carbon often exceeded 5 mg l -1 in or close to the estuarine turbidity maximum (ETM) of the Chikugo River estuary. However, such high concentrations were rarely observed in the other two estuaries. The observed differences could be attributable to different hydrodynamic processes related to the different lengths of tidal reaches: 23, 8, and 6 km in the Chikugo, Midori, and Kuma Rivers, respectively. In the Chikugo River estuary, spatiotemporal changes of chlorophyll a suggested that phytoplankton occurred abundantly up-and/or downstream from the ETM especially during the warm season. In contrast, pheophytin (i.e., plant detritus) always accumulated in or close to the ETM. Carbon stable isotope ratios and carbon to nitrogen ratios indicated that the plant detritus was derived from phytoplankton and terrestrial plants. The Chikugo River estuary has a high potential to support the production of estuarine organisms through abundant plant detritus in the well-developed ETM all the year round.

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Section: Implications For Estuarine Organismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Year-round accumulation of particulate organic matter in the estuarine turbidity maximum: comparative observations in three macrotidal estuaries (Chikugo, Midori, and Kuma Rivers), southwestern Japan

et al. 2012

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“…3). The two migratory pathways of early juveniles of the temperate seabass are similar to those observed in the well-mixed Chikugo River estuary [10,12], although the hydrographic conditions of the two estuaries and genetic characteristics of the respective fish populations are considerably different [7,15,20]. This similarity in migratory pathways indicates that these pathways are part of the native ecology of juveniles of L. japonicus and common to temperate seabass juveniles in other estuaries.…”

Section: Distributionmentioning

confidence: 75%

“…In the Chikuogo River estuary, some of the early juveniles (approx. 20 mm standard length, SL) ascend the river in March to inhabit the upper estuary, including the freshwater zone [8][9][10][11], while others reside in the lower estuary [8,9] or in the littoral zone [12]. The migration of early juveniles of temperate seabass to the freshwater zone has only been reported in the Chikugo River estuary.…”

Section: Introductionmentioning

confidence: 99%

Freshwater migration and feeding habits of juvenile temperate seabass Lateolabrax japonicus in the stratified Yura River estuary, the Sea of Japan

et al. 2010

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Juvenile temperate seabass Lateolabrax japonicus were sampled along the Yura River estuary from April to July 2008 to determine their distribution and feeding habits during migration within a microtidal estuary. Throughout the sampling period, juvenile seabass were distributed not only in the surf zone, but also in the freshwater zone, and they were particularly abundant in areas with aquatic vegetation in the freshwater zone. This distribution pattern suggests that the early life history of the temperate seabass depends more intensively on the river (freshwater) than previously considered. Small juveniles in the freshwater zone fed on copepods and chironomid larvae and upon reaching a standard length (SL) of approximately 20 mm did they fed on mysids. In contrast, juveniles (approx. 17-80 mm SL) in the surf zone fed mainly on mysids.

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“…As a result, the ETM was shown to develop through tidal energy especially at spring tides (Suzuki et al 2007) and to recover within a few weeks after a large flood (Suzuki et al 2009a). Furthermore, the ETM proved to be an essential habitat for semi-endemic species in the Ariake Sea (i.e., species found only in the Ariake Sea within Japan), such as Trachidermus fasciatus (Scorpaeniformes, Cottidae; Islam et al 2006aIslam et al , 2007, Hyperacanthomysis longirostris (Mysida, Mysidacea; Suzuki et al 2008aSuzuki et al , b, 2009b, and Sinocalanus sinensis (Calanoida, Centropagidae; Hibino et al 1999;Islam et al 2006b;Suzuki et al 2008b). Therefore, the ecological role of the ETM in the Chikugo River is considered to be different from that of the neighboring littoral areas in the Ariake Sea (Hibino et al 2002(Hibino et al , 2006.…”

Section: Introductionmentioning

confidence: 99%

Instability of the turbidity maximum in the macrotidal Geum River estuary, western Korea

et al. 2009

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In the low-salinity area of many macrotidal estuaries, through the combination of tidal pumping and estuarine circulation, an estuarine turbidity maximum (ETM) develops providing favorable conditions for various organisms. To investigate ecological roles of the ETM in East Asian estuaries, we conducted seasonal observations in the Geum (or Keum) River estuary, one of the representative macrotidal estuaries flowing into the Yellow Sea, from 2007 to 2008. The estuary was frequently filled with high-salinity ([10 PSU) and low-turbidity (\100 NTU) water under small or no freshwater discharge from a dam (ca. 8 km upstream from the river mouth). Brackish water was, however, completely pushed out of the estuary within a few hours after an intensive discharge in summer. Chlorophyll a (up to 50 lg l -1 ) and pheophytin (up to 80 lg l -1 ) were concentrated in a low-salinity (\1 PSU) and high-turbidity (up to 1000 NTU) area, indicating that the intensive discharge transported both living phytoplankton and resuspended detritus into the area. In contrast, a phytoplankton bloom (chlorophyll a, up to 100 lg l -1 ) was observed at low salinities under little discharge in winter. The present study demonstrated an absence of the ETM suitable for estuarine-dependent organisms from the present Geum River estuary, indicating potential importance of adequate control of freshwater discharge for the formation and maintenance of the ETM.

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Migration of Japanese temperate bass Lateolabrax japonicus juveniles within the Chikugo River estuary revealed by δ13C analysis

Cited by 22 publications

References 20 publications

Year-round accumulation of particulate organic matter in the estuarine turbidity maximum: comparative observations in three macrotidal estuaries (Chikugo, Midori, and Kuma Rivers), southwestern Japan

Year-round accumulation of particulate organic matter in the estuarine turbidity maximum: comparative observations in three macrotidal estuaries (Chikugo, Midori, and Kuma Rivers), southwestern Japan

Freshwater migration and feeding habits of juvenile temperate seabass Lateolabrax japonicus in the stratified Yura River estuary, the Sea of Japan

Instability of the turbidity maximum in the macrotidal Geum River estuary, western Korea

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