Clearance rates and ingestion efficiency of the Japanese scallop Patinopecten yessoensis

Aya, Frolan A.; Hidaka, Yoshiki; Kudo, Isao

doi:10.3800/pbr.8.134

Cited by 7 publications

(3 citation statements)

References 18 publications

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“…It is cultivated using the "rotational" harvesting system, where a particular culture zone is seeded with juveniles after the adult-sized individuals are harvested [23]. Previous studies have analyzed some aspects of Mizuhopecten yessoensis biology and ecology, including distribution and abundance [24], recruitment [23], and feeding rates [25,26].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen stable isotopes reveal age-dependent dietary shift in the Japanese scallop Mizuhopecten yessoensis

Aya

Kudo

2016

Isotopes in Environmental and Health Studies

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Ontogenetic niche shifts in diet are a consequence of changes in body size or resource partitioning between age classes. To better resolve the feeding patterns of the Japanese scallop Mizuhopecten yessoensis, we examined the relative importance of age and size in the diet of this species using stable isotope ratios of carbon (δC) and nitrogen (δN) from 2006 to 2009. Contribution of food sources was quantified using an isotope mixing model by comparing the muscle tissue isotope ratios to those of suspended particulate organic matter (SPOM) and their zooplankton prey (e.g. micro- and meso-zooplankton). Unlike the δC values, which remained constant with age and size, muscle δN values were more positively correlated with age accounting for 69 % of variations than size with only 46 %. Increasing N values with age suggested that shifts in diet from SPOM to micro- and meso-zooplankton occurred during ontogeny in M. yessoensis. Results of the isotope mixing model indicated that SPOM contribution to scallop's diet decreased from 68 to 8 % while those of zooplankton increased from 15 to 50 % with increasing age. This study concludes that age-related dietary shift explains the enrichment ofN, as a result of predation on zooplankton by M. yessoensis.

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Section: Introductionmentioning

confidence: 99%

Nitrogen stable isotopes reveal age-dependent dietary shift in the Japanese scallop Mizuhopecten yessoensis

Aya

Kudo

2016

Isotopes in Environmental and Health Studies

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“…High ∆δ 13 C values derived for juvenile scallops could thus reflect the amount of ingested food by scallops. During the summer, M. yessoensis experienced low food supply (Aya et al 2013;Aya & Kudo 2022) and for juvenile scallops especially, sinking particles (SP) are an important energy source after post-settlement (Aya & Kudo 2010). In this case however, the small seasonal variation seen in ∆δ 13 C suggests that low quantity consumption of sinking particles by juvenile scallops is unlikely to have influenced the muscle tissue carbon signatures.…”

Section: Relationship Between Carbon and Nitrogen Fractionation With ...mentioning

confidence: 85%

Effect of diet isotopic ratios on the δ<sup>13</sup>C and δ<sup>15</sup>N signatures of scallop-gut contents in a natural setting

Aya,

Kudo

2023

Plankton Benthos Res

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The relationship between diet isotopic signatures and the extent of the tissue-diet isotope fractionation factors have been shown previously in controlled feeding studies, but this relationship remains poorly resolved for marine invertebrates in a natural setting. Using isotope analysis of gut contents, this study investigated the variability in tissuediet isotopic fractionation factors (Δδ 13 C and Δδ 15 N) between scallop tissues (i.e. muscle and digestive gland) and gut content in the Japanese scallop Mizuhopecten yessoensis (Jay, 1857) and assessed how the growth rate of juvenile scallops and gut content quality (as carbon to nitrogen (C/N) molar ratios) would affect the values of tissue-diet isotopic fractionation. Tissue-diet isotopic fractionation factors (Δδ 13 C and ∆δ 15 N) varied according to tissue, which averaged 1.7‰ and −0.1‰ for N in muscle and digestive gland, and 3.4‰ and 1.2‰ for C in muscle and digestive gland, respectively. Muscle-gut ∆δ 15 N isotopic factors negatively correlated with growth rate, suggesting that the juvenile δ 15 N signatures were strongly dependent on food quantity. The influence of diet quality on ∆δ 15 N was also evident, where ∆δ 15 N decreased as C/N molar ratios in gut contents increased. The wide difference in Δδ 13 C and ∆δ 15 N from accepted standard values may be, in part, a consequence of using gut contents as a dietary proxy. Results of this study have implications for diet reconstruction studies of this scallop species reared under field conditions.

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“…Scallop (Mizuhopecten yessoensis) culture is well established in the bay, and annual production is about 0.1 million tons. Scallop feeds on phytoplankton and particulate organic matter (MacDonald et al, 2006: Aya et al, 2013. Therefore the estimation of primary productivity is important to consider a sustainable allowance for scallop culture in the bay.…”

Section: Introductionmentioning

confidence: 99%

Primary productivity and nitrogen assimilation with identifying the contribution of urea in Funka Bay, Japan

Kudo

Hisatoku

Yoshimura

et al. 2015

Estuarine, Coastal and Shelf Science

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Primary production is supported by utilization of several forms of nitrogen (N), such as nitrate, ammonium, and urea. Nevertheless, only few studies have measured the concentration and uptake of urea despite its importance as a nitrogenous nutrient for phytoplankton. We measured primary productivity monthly at four depths within the euphotic zone using a clean technique and the 13 C method by a 24 h in situ mooring incubation over a year in Funka Bay, a subarctic coastal area in Japan, to make better updated estimates (re-evaluation) of annual primary production. Nitrogenous (N) nutrient assimilation rates (nitrate, ammonium and urea) were also measured to elucidate the relative contributions of these nutrients to autotrophic production and to distinguish between new and regenerated production. The estimated annual primary production was 164 g C m -2 , which was 40-60% higher than the previously reported The assimilation rate of urea was almost comparable to that of ammonium throughout the year. Taking urea into account, the f-ratio ranged from 0.15 under the nitrate-depleted conditions to 0.8 under the spring bloom conditions. These ratios were overestimated by 50% and 10%, respectively, if urea uptake was eliminated. We provide a valuable data for the primary production dataset in the world's ecosystems, and show that urea plays an important role in supporting regenerated production during late spring and summer.

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Clearance rates and ingestion efficiency of the Japanese scallop Patinopecten yessoensis

Cited by 7 publications

References 18 publications

Nitrogen stable isotopes reveal age-dependent dietary shift in the Japanese scallop Mizuhopecten yessoensis

Nitrogen stable isotopes reveal age-dependent dietary shift in the Japanese scallop Mizuhopecten yessoensis

Effect of diet isotopic ratios on the δ<sup>13</sup>C and δ<sup>15</sup>N signatures of scallop-gut contents in a natural setting

Primary productivity and nitrogen assimilation with identifying the contribution of urea in Funka Bay, Japan

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