Spatial and temporal variations in the diet of Crangon uritai were examined using stable isotope ... more Spatial and temporal variations in the diet of Crangon uritai were examined using stable isotope and stomach content analyses. The sand shrimp and its potential prey were collected from Yura Estuary (3-5 m), shallow coast (5-10 m), and deep coast (30-60 m) stations of Tango Sea from April 2006 to February 2007. The measurements of the length (carapace and total lengths) and feeding habit (stomach content and stable isotope ratios) of C. uritai showed that this shrimp changed its diet during migrations between the estuary and marine environments. This species consumes a variety of food at the lower estuary: mysid Orientomysis japonica, small crustaceans particularly amphipod Melita hoshinoi, and bivalve Veremolpa micra. The abundant mysid O. japonica at the shallow coast and juveniles of unidentified bivalve species at the deep coast were the favored food throughout the year. The d 13 C and d 15 N variations in C. uritai confirmed the spatial and temporal diet shift in gut content composition as the sand shrimp grow and migrate along the estuary-marine gradient.
Temporal variations in stable isotope ratios and fatty acid composition were examined in 3 crusta... more Temporal variations in stable isotope ratios and fatty acid composition were examined in 3 crustacean species and their potential food sources in a temperate estuary. We hypothesized that the shrimp Palaemon peringueyi, the mud prawn Upogebia africana and the sand prawn Callichirus kraussi have disparate diets due to interspecific differences in metabolism and feeding mode and that diets of the crustaceans all change temporally due to variations in available food. The species with the most variable diet was expected to have the greatest niche differentiation. We sampled the 3 crustaceans and their food sources on occasions spanning 4 seasons. The diet of P. peringueyi changed from a dominance of benthic microalgae in spring and winter to increased contributions of particulate organic matter (POM) in summer, with preferential sequestration of 22:6ω3. U. africana showed a stable dependence on estuarine POM as the main source of its energy, while C. kraussi relied more on marine POM, except in winter, when benthic microalgae was an important energy source. The 2 infaunal prawns showed elevated proportions of 16:1ω7 and 20:5ω3 throughout most of the year, probably originating from diatoms. P. peringueyi showed a different preferred diet than the 2 prawns, resulting in an isotopic niche segregation from the infaunal prawns, but the fatty acid niche of the shrimp overlapped with the prawns. Stable isotope values revealed the temporal variations in the origins and proportions of different food sources contributing to the diet of each species, while fatty acid data provided information on finer-scale trophic interactions. Temporal variations in estuarine consumer diets should be considered in estuarine food web studies whenever possible.
ABSTRACT We investigated the fluctuations of carbon and nitrogen stable isotope ratios in benthic... more ABSTRACT We investigated the fluctuations of carbon and nitrogen stable isotope ratios in benthic consumers and their potential food sources to determine the spatial and temporal variations in the utilization of available organic matter, indicating the origin and pathways of energy from Yura Estuary to Tango Sea, Japan. Field samplings were conducted from the upper estuary to offshore with sampling frequency of twice per season from April (spring) 2006 to February (winter) 2007. The δ13C signatures of the upper and lower estuary benthos showed depleted and in wide range (−28.9‰ to −13.5‰) compared to the enriched and within narrow range signatures of marine benthos (−20.6‰ to −14.0‰) in all seasons. On the contrary, the δ15N signatures of benthic communities showed decreasing trend seaward and summer values were different from the other seasons. Using the dual isotope and multisource mixing models, we estimated the relative contributions of potential food sources to the benthos diet. River POM played an important source of energy for the estuarine benthos, especially in winter when river discharge was high. Marine POM served as an important alternative food for the estuarine benthos from spring to autumn when seawater intruded the bottom estuary. Benthic microalgae were the major food source at the shallow coast throughout the year, while marine POM fueled the deep coast and offshore benthic food webs. Spatial and temporal feeding variations in estuarine benthic communities were driven by the hydrology of the estuary, whereas primary production and transport of food source dictated diet variations of marine benthic communities. The elucidation of the dynamic energy subsidy among aquatic systems highlights the importance of the land–sea transition zones that is crucial for benthic secondary productions.
change diets. Variations in the metabolic turnover rates of stable isotope ratios and fatty acids... more change diets. Variations in the metabolic turnover rates of stable isotope ratios and fatty acids in the muscle tissues of the shrimp were largely driven by the quality of the food provided and revealed physiological flexibility in an omnivorous consumer.
We examined the feeding niche of four species of molluscs by analysis of their stable isotope sig... more We examined the feeding niche of four species of molluscs by analysis of their stable isotope signatures and cellulase activities to determine if they could utilize terrestrial organic matter. The molluscs and potential food sources were collected from the upper, middle and lower estuary of the Yura River from spring 2007 to winter 2008. All species showed positive cellulase activity which highlighted their potential to digest terrestrial organic matter. Consumption and assimilation of terrestrial organic matter by estuarine molluscs however varied spatially and temporally, reflecting species-specific differences in feeding niche and in response to variations in food availability in the estuary. Thus, terrestrial primary production in the catchment area supports secondary production of molluscs in the Yura River estuary.
The particulate organic matter (POM) in hydrodynamically variable habitats such as the lower reac... more The particulate organic matter (POM) in hydrodynamically variable habitats such as the lower reaches of estuaries can change in its content and quality on very short time scales (example, hourly), and these changes can potentially influence higher-level consumers in river-estuary-marine systems. Estuarine water samples were collected hourly for 12 h downstream in a small river to evaluate the fatty acid composition of POM over a tidal cycle. Fatty acid constituents of POM collected during the flood tide were dominated by the saturated, higher plant and bacterial fatty acids, whereas unsaturated, polyunsaturated, essential, and diatom-associated fatty acids dominated the POM collected during the ebb tide. Elevated algal biomass (as indicated by high chlorophyll a concentrations), diatom, and freshness indices in the POM indicated enhanced fresh autochthonous-origin materials that dominated the mixed organic pool during the ebb tide compared to more degraded detritus during the flood tide. Tidal retention of organic matter and algal primary production were the most influential factors that differentiated the fatty acid composition of estuarine POM over the short time scale. The results of this study have important implications on the quality of POM at the time of sampling, especially in estuaries where mixed organic pools have multiple inputs and are strongly influenced by tidal cycles.
Asian Journal of Fisheries and Aquatic Research, 2022
Aims: The taxonomic identification of mangrove clams was confirmed using DNA barcoding based on 1... more Aims: The taxonomic identification of mangrove clams was confirmed using DNA barcoding based on 16S mitochondrial DNA (mtDNA) genome. Study design: DNA was extracted from adductor muscle of mangrove clams sample. Purified DNA were sequenced and barcode was generated. Place and duration of the study: The mangrove clams samples used in the study were collected from Malita,
ABSTRACT We investigated the fluctuations of carbon and nitrogen stable isotope ratios in benthic... more ABSTRACT We investigated the fluctuations of carbon and nitrogen stable isotope ratios in benthic consumers and their potential food sources to determine the spatial and temporal variations in the utilization of available organic matter, indicating the origin and pathways of energy from Yura Estuary to Tango Sea, Japan. Field samplings were conducted from the upper estuary to offshore with sampling frequency of twice per season from April (spring) 2006 to February (winter) 2007. The δ13C signatures of the upper and lower estuary benthos showed depleted and in wide range (−28.9‰ to −13.5‰) compared to the enriched and within narrow range signatures of marine benthos (−20.6‰ to −14.0‰) in all seasons. On the contrary, the δ15N signatures of benthic communities showed decreasing trend seaward and summer values were different from the other seasons. Using the dual isotope and multisource mixing models, we estimated the relative contributions of potential food sources to the benthos diet. River POM played an important source of energy for the estuarine benthos, especially in winter when river discharge was high. Marine POM served as an important alternative food for the estuarine benthos from spring to autumn when seawater intruded the bottom estuary. Benthic microalgae were the major food source at the shallow coast throughout the year, while marine POM fueled the deep coast and offshore benthic food webs. Spatial and temporal feeding variations in estuarine benthic communities were driven by the hydrology of the estuary, whereas primary production and transport of food source dictated diet variations of marine benthic communities. The elucidation of the dynamic energy subsidy among aquatic systems highlights the importance of the land–sea transition zones that is crucial for benthic secondary productions.
Temporal variations in stable isotope ratios and fatty acid composition were examined in 3 crusta... more Temporal variations in stable isotope ratios and fatty acid composition were examined in 3 crustacean species and their potential food sources in a temperate estuary. We hypothesized that the shrimp Palaemon peringueyi, the mud prawn Upogebia africana and the sand prawn Callichirus kraussi have disparate diets due to interspecific differences in metabolism and feeding mode and that diets of the crustaceans all change temporally due to variations in available food. The species with the most variable diet was expected to have the greatest niche differentiation. We sampled the 3 crustaceans and their food sources on occasions spanning 4 seasons. The diet of P. peringueyi changed from a dominance of benthic microalgae in spring and winter to increased contributions of particulate organic matter (POM) in summer, with preferential sequestration of 22:6ω3. U. africana showed a stable dependence on estuarine POM as the main source of its energy, while C. kraussi relied more on marine POM, except in winter, when benthic microalgae was an important energy source. The 2 infaunal prawns showed elevated proportions of 16:1ω7 and 20:5ω3 throughout most of the year, probably originating from diatoms. P. peringueyi showed a different preferred diet than the 2 prawns, resulting in an isotopic niche segregation from the infaunal prawns, but the fatty acid niche of the shrimp overlapped with the prawns. Stable isotope values revealed the temporal variations in the origins and proportions of different food sources contributing to the diet of each species, while fatty acid data provided information on finer-scale trophic interactions. Temporal variations in estuarine consumer diets should be considered in estuarine food web studies whenever possible.
Spatial and temporal variations in the diet of Crangon uritai were examined using stable isotope ... more Spatial and temporal variations in the diet of Crangon uritai were examined using stable isotope and stomach content analyses. The sand shrimp and its potential prey were collected from Yura Estuary (3-5 m), shallow coast (5-10 m), and deep coast (30-60 m) stations of Tango Sea from April 2006 to February 2007. The measurements of the length (carapace and total lengths) and feeding habit (stomach content and stable isotope ratios) of C. uritai showed that this shrimp changed its diet during migrations between the estuary and marine environments. This species consumes a variety of food at the lower estuary: mysid Orientomysis japonica, small crustaceans particularly amphipod Melita hoshinoi, and bivalve Veremolpa micra. The abundant mysid O. japonica at the shallow coast and juveniles of unidentified bivalve species at the deep coast were the favored food throughout the year. The d 13 C and d 15 N variations in C. uritai confirmed the spatial and temporal diet shift in gut content composition as the sand shrimp grow and migrate along the estuary-marine gradient.
To examine the influence of salt-wedge intrusion on ecological processes at lower trophic levels ... more To examine the influence of salt-wedge intrusion on ecological processes at lower trophic levels in estuaries, we investigated seasonal variability in the nutrients, phytoplankton biomass (chlorophyll a), zooplankton density, and composition in the Yura Estuary, Japan. Phytoplankton composition was determined under two discriminative regimes: salt-wedge regime (summer) and freshwater regime (winter). Phytoplankton from two groups bloomed simultaneously under the salt-wedge regime. Freshwater and brackish phytoplankton dominated the upper freshwater layer (w16,100 cells mL À1) while marine phytoplankton were dominant below the halocline (w12,200 cells mL À1). Both phytoplankton groups grew using riverine nutrients. Marine phytoplankton increased closer to the tip of the salt-wedge, indicating that marine phytoplankton grew in situ in the river. The residence time of salt water increased due to the low river discharge from spring to summer, enhancing mineralization in the salt-wedge. Regenerated nutrients in the salt-wedge contribute to subsequent marine phytoplankton blooms. Copepods were more abundant in the salt-wedge (w80.9 ind. L À1) than in the upper freshwater layer (w14.2 ind. L À1) during summer. Phytoplankton and zooplankton densities under the freshwater regime (winter; w360 cells mL À1 , w39.7 ind. L À1) were lower than under the salt-wedge regime (summer). The high river discharge under the freshwater regime flushes out the salt-wedge and discourages biological production in the river. Our results showed that salt-wedge intrusions change the physical conditions and nutrient dynamics, enhancing biological production in the salt-wedge estuary.
We investigated the distribution of δ13C and δ15N of organic matter among benthic communities fro... more We investigated the distribution of δ13C and δ15N of organic matter among benthic communities from the upper estuary of Yura River to offshore of Tango Sea, Japan, to determine spatial variation in utilization of organic matter by benthic communities. The ...
... Emily S. Antonio a , Corresponding Author Contact Information , E-mail The Corresponding Auth... more ... Emily S. Antonio a , Corresponding Author Contact Information , E-mail The Corresponding Author , Akihide Kasai b , Masahiro Ueno a , Yoshiro Kurikawa b ... energy sources of estuarine ([Herman et al., 2000], [Moens et al., 2002] and [Kasai et al., 2004]) and coastal ([Kang et al ...
Spatial and temporal variations in the diet of Crangon uritai were examined using stable isotope ... more Spatial and temporal variations in the diet of Crangon uritai were examined using stable isotope and stomach content analyses. The sand shrimp and its potential prey were collected from Yura Estuary (3-5 m), shallow coast (5-10 m), and deep coast (30-60 m) stations of Tango Sea from April 2006 to February 2007. The measurements of the length (carapace and total lengths) and feeding habit (stomach content and stable isotope ratios) of C. uritai showed that this shrimp changed its diet during migrations between the estuary and marine environments. This species consumes a variety of food at the lower estuary: mysid Orientomysis japonica, small crustaceans particularly amphipod Melita hoshinoi, and bivalve Veremolpa micra. The abundant mysid O. japonica at the shallow coast and juveniles of unidentified bivalve species at the deep coast were the favored food throughout the year. The d 13 C and d 15 N variations in C. uritai confirmed the spatial and temporal diet shift in gut content composition as the sand shrimp grow and migrate along the estuary-marine gradient.
Temporal variations in stable isotope ratios and fatty acid composition were examined in 3 crusta... more Temporal variations in stable isotope ratios and fatty acid composition were examined in 3 crustacean species and their potential food sources in a temperate estuary. We hypothesized that the shrimp Palaemon peringueyi, the mud prawn Upogebia africana and the sand prawn Callichirus kraussi have disparate diets due to interspecific differences in metabolism and feeding mode and that diets of the crustaceans all change temporally due to variations in available food. The species with the most variable diet was expected to have the greatest niche differentiation. We sampled the 3 crustaceans and their food sources on occasions spanning 4 seasons. The diet of P. peringueyi changed from a dominance of benthic microalgae in spring and winter to increased contributions of particulate organic matter (POM) in summer, with preferential sequestration of 22:6ω3. U. africana showed a stable dependence on estuarine POM as the main source of its energy, while C. kraussi relied more on marine POM, except in winter, when benthic microalgae was an important energy source. The 2 infaunal prawns showed elevated proportions of 16:1ω7 and 20:5ω3 throughout most of the year, probably originating from diatoms. P. peringueyi showed a different preferred diet than the 2 prawns, resulting in an isotopic niche segregation from the infaunal prawns, but the fatty acid niche of the shrimp overlapped with the prawns. Stable isotope values revealed the temporal variations in the origins and proportions of different food sources contributing to the diet of each species, while fatty acid data provided information on finer-scale trophic interactions. Temporal variations in estuarine consumer diets should be considered in estuarine food web studies whenever possible.
ABSTRACT We investigated the fluctuations of carbon and nitrogen stable isotope ratios in benthic... more ABSTRACT We investigated the fluctuations of carbon and nitrogen stable isotope ratios in benthic consumers and their potential food sources to determine the spatial and temporal variations in the utilization of available organic matter, indicating the origin and pathways of energy from Yura Estuary to Tango Sea, Japan. Field samplings were conducted from the upper estuary to offshore with sampling frequency of twice per season from April (spring) 2006 to February (winter) 2007. The δ13C signatures of the upper and lower estuary benthos showed depleted and in wide range (−28.9‰ to −13.5‰) compared to the enriched and within narrow range signatures of marine benthos (−20.6‰ to −14.0‰) in all seasons. On the contrary, the δ15N signatures of benthic communities showed decreasing trend seaward and summer values were different from the other seasons. Using the dual isotope and multisource mixing models, we estimated the relative contributions of potential food sources to the benthos diet. River POM played an important source of energy for the estuarine benthos, especially in winter when river discharge was high. Marine POM served as an important alternative food for the estuarine benthos from spring to autumn when seawater intruded the bottom estuary. Benthic microalgae were the major food source at the shallow coast throughout the year, while marine POM fueled the deep coast and offshore benthic food webs. Spatial and temporal feeding variations in estuarine benthic communities were driven by the hydrology of the estuary, whereas primary production and transport of food source dictated diet variations of marine benthic communities. The elucidation of the dynamic energy subsidy among aquatic systems highlights the importance of the land–sea transition zones that is crucial for benthic secondary productions.
change diets. Variations in the metabolic turnover rates of stable isotope ratios and fatty acids... more change diets. Variations in the metabolic turnover rates of stable isotope ratios and fatty acids in the muscle tissues of the shrimp were largely driven by the quality of the food provided and revealed physiological flexibility in an omnivorous consumer.
We examined the feeding niche of four species of molluscs by analysis of their stable isotope sig... more We examined the feeding niche of four species of molluscs by analysis of their stable isotope signatures and cellulase activities to determine if they could utilize terrestrial organic matter. The molluscs and potential food sources were collected from the upper, middle and lower estuary of the Yura River from spring 2007 to winter 2008. All species showed positive cellulase activity which highlighted their potential to digest terrestrial organic matter. Consumption and assimilation of terrestrial organic matter by estuarine molluscs however varied spatially and temporally, reflecting species-specific differences in feeding niche and in response to variations in food availability in the estuary. Thus, terrestrial primary production in the catchment area supports secondary production of molluscs in the Yura River estuary.
The particulate organic matter (POM) in hydrodynamically variable habitats such as the lower reac... more The particulate organic matter (POM) in hydrodynamically variable habitats such as the lower reaches of estuaries can change in its content and quality on very short time scales (example, hourly), and these changes can potentially influence higher-level consumers in river-estuary-marine systems. Estuarine water samples were collected hourly for 12 h downstream in a small river to evaluate the fatty acid composition of POM over a tidal cycle. Fatty acid constituents of POM collected during the flood tide were dominated by the saturated, higher plant and bacterial fatty acids, whereas unsaturated, polyunsaturated, essential, and diatom-associated fatty acids dominated the POM collected during the ebb tide. Elevated algal biomass (as indicated by high chlorophyll a concentrations), diatom, and freshness indices in the POM indicated enhanced fresh autochthonous-origin materials that dominated the mixed organic pool during the ebb tide compared to more degraded detritus during the flood tide. Tidal retention of organic matter and algal primary production were the most influential factors that differentiated the fatty acid composition of estuarine POM over the short time scale. The results of this study have important implications on the quality of POM at the time of sampling, especially in estuaries where mixed organic pools have multiple inputs and are strongly influenced by tidal cycles.
Asian Journal of Fisheries and Aquatic Research, 2022
Aims: The taxonomic identification of mangrove clams was confirmed using DNA barcoding based on 1... more Aims: The taxonomic identification of mangrove clams was confirmed using DNA barcoding based on 16S mitochondrial DNA (mtDNA) genome. Study design: DNA was extracted from adductor muscle of mangrove clams sample. Purified DNA were sequenced and barcode was generated. Place and duration of the study: The mangrove clams samples used in the study were collected from Malita,
ABSTRACT We investigated the fluctuations of carbon and nitrogen stable isotope ratios in benthic... more ABSTRACT We investigated the fluctuations of carbon and nitrogen stable isotope ratios in benthic consumers and their potential food sources to determine the spatial and temporal variations in the utilization of available organic matter, indicating the origin and pathways of energy from Yura Estuary to Tango Sea, Japan. Field samplings were conducted from the upper estuary to offshore with sampling frequency of twice per season from April (spring) 2006 to February (winter) 2007. The δ13C signatures of the upper and lower estuary benthos showed depleted and in wide range (−28.9‰ to −13.5‰) compared to the enriched and within narrow range signatures of marine benthos (−20.6‰ to −14.0‰) in all seasons. On the contrary, the δ15N signatures of benthic communities showed decreasing trend seaward and summer values were different from the other seasons. Using the dual isotope and multisource mixing models, we estimated the relative contributions of potential food sources to the benthos diet. River POM played an important source of energy for the estuarine benthos, especially in winter when river discharge was high. Marine POM served as an important alternative food for the estuarine benthos from spring to autumn when seawater intruded the bottom estuary. Benthic microalgae were the major food source at the shallow coast throughout the year, while marine POM fueled the deep coast and offshore benthic food webs. Spatial and temporal feeding variations in estuarine benthic communities were driven by the hydrology of the estuary, whereas primary production and transport of food source dictated diet variations of marine benthic communities. The elucidation of the dynamic energy subsidy among aquatic systems highlights the importance of the land–sea transition zones that is crucial for benthic secondary productions.
Temporal variations in stable isotope ratios and fatty acid composition were examined in 3 crusta... more Temporal variations in stable isotope ratios and fatty acid composition were examined in 3 crustacean species and their potential food sources in a temperate estuary. We hypothesized that the shrimp Palaemon peringueyi, the mud prawn Upogebia africana and the sand prawn Callichirus kraussi have disparate diets due to interspecific differences in metabolism and feeding mode and that diets of the crustaceans all change temporally due to variations in available food. The species with the most variable diet was expected to have the greatest niche differentiation. We sampled the 3 crustaceans and their food sources on occasions spanning 4 seasons. The diet of P. peringueyi changed from a dominance of benthic microalgae in spring and winter to increased contributions of particulate organic matter (POM) in summer, with preferential sequestration of 22:6ω3. U. africana showed a stable dependence on estuarine POM as the main source of its energy, while C. kraussi relied more on marine POM, except in winter, when benthic microalgae was an important energy source. The 2 infaunal prawns showed elevated proportions of 16:1ω7 and 20:5ω3 throughout most of the year, probably originating from diatoms. P. peringueyi showed a different preferred diet than the 2 prawns, resulting in an isotopic niche segregation from the infaunal prawns, but the fatty acid niche of the shrimp overlapped with the prawns. Stable isotope values revealed the temporal variations in the origins and proportions of different food sources contributing to the diet of each species, while fatty acid data provided information on finer-scale trophic interactions. Temporal variations in estuarine consumer diets should be considered in estuarine food web studies whenever possible.
Spatial and temporal variations in the diet of Crangon uritai were examined using stable isotope ... more Spatial and temporal variations in the diet of Crangon uritai were examined using stable isotope and stomach content analyses. The sand shrimp and its potential prey were collected from Yura Estuary (3-5 m), shallow coast (5-10 m), and deep coast (30-60 m) stations of Tango Sea from April 2006 to February 2007. The measurements of the length (carapace and total lengths) and feeding habit (stomach content and stable isotope ratios) of C. uritai showed that this shrimp changed its diet during migrations between the estuary and marine environments. This species consumes a variety of food at the lower estuary: mysid Orientomysis japonica, small crustaceans particularly amphipod Melita hoshinoi, and bivalve Veremolpa micra. The abundant mysid O. japonica at the shallow coast and juveniles of unidentified bivalve species at the deep coast were the favored food throughout the year. The d 13 C and d 15 N variations in C. uritai confirmed the spatial and temporal diet shift in gut content composition as the sand shrimp grow and migrate along the estuary-marine gradient.
To examine the influence of salt-wedge intrusion on ecological processes at lower trophic levels ... more To examine the influence of salt-wedge intrusion on ecological processes at lower trophic levels in estuaries, we investigated seasonal variability in the nutrients, phytoplankton biomass (chlorophyll a), zooplankton density, and composition in the Yura Estuary, Japan. Phytoplankton composition was determined under two discriminative regimes: salt-wedge regime (summer) and freshwater regime (winter). Phytoplankton from two groups bloomed simultaneously under the salt-wedge regime. Freshwater and brackish phytoplankton dominated the upper freshwater layer (w16,100 cells mL À1) while marine phytoplankton were dominant below the halocline (w12,200 cells mL À1). Both phytoplankton groups grew using riverine nutrients. Marine phytoplankton increased closer to the tip of the salt-wedge, indicating that marine phytoplankton grew in situ in the river. The residence time of salt water increased due to the low river discharge from spring to summer, enhancing mineralization in the salt-wedge. Regenerated nutrients in the salt-wedge contribute to subsequent marine phytoplankton blooms. Copepods were more abundant in the salt-wedge (w80.9 ind. L À1) than in the upper freshwater layer (w14.2 ind. L À1) during summer. Phytoplankton and zooplankton densities under the freshwater regime (winter; w360 cells mL À1 , w39.7 ind. L À1) were lower than under the salt-wedge regime (summer). The high river discharge under the freshwater regime flushes out the salt-wedge and discourages biological production in the river. Our results showed that salt-wedge intrusions change the physical conditions and nutrient dynamics, enhancing biological production in the salt-wedge estuary.
We investigated the distribution of δ13C and δ15N of organic matter among benthic communities fro... more We investigated the distribution of δ13C and δ15N of organic matter among benthic communities from the upper estuary of Yura River to offshore of Tango Sea, Japan, to determine spatial variation in utilization of organic matter by benthic communities. The ...
... Emily S. Antonio a , Corresponding Author Contact Information , E-mail The Corresponding Auth... more ... Emily S. Antonio a , Corresponding Author Contact Information , E-mail The Corresponding Author , Akihide Kasai b , Masahiro Ueno a , Yoshiro Kurikawa b ... energy sources of estuarine ([Herman et al., 2000], [Moens et al., 2002] and [Kasai et al., 2004]) and coastal ([Kang et al ...
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