Spatial and interspecific variation in the food sources of sympatric estuarine nereidid polychaetes: stable isotopic and enzymatic approaches

Kanaya, Gen; Niiyama, Takatoshi; Tanimura, Aya; Toyohara, Haruhiko; Tosuji, Hiroaki; Sato, Masanori

doi:10.1007/s00227-018-3361-8

Cited by 10 publications

(15 citation statements)

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“…Stable isotope ratio n CA (µmol min −1 mg-protein −1 ) n Size (mm) † Feeding habit δ 13 C ( ) δ 15 N ( ) the tetrazolium blue method, and CA was expressed as the glucose content per min per mg of protein. We have previously reported some of the CA data (Kanaya et al 2018).…”

Section: Taxamentioning

confidence: 99%

“…The dietary contributions of potential food sources were estimated using a δ 13 C-based Bayesian isotope mixing model (SIAR; Parnell et al 2010), using reported δ 13 C values of microphytobenthos (MPB; −16.7±2.2 , n=7), marine particulate organic matter (MPOM; −20.3±0.8 , n=6), and riverine particulate organic matter (RPOM) and marsh plant litter (−27.0±1.6 , n=13) from Japanese estuaries (see Kanaya et al 2018 for the source datasets). In the procedure, δ 13 C values of RPOM and marsh plant litter were averaged as RPOM/ detritus because their δ 13 C values were nearly identical.…”

Section: Polychaetementioning

confidence: 99%

“…Reported isotope values of microphytobenthos (MPB), marine particulate organic matter (MPOM), marsh plant litter, and riverine particulate organic matter (RPOM) are also plotted ( ). See the text and Kanaya et al (2018) for the source of the data. Fig.…”

Section: Polychaetementioning

confidence: 99%

“…Accordingly, differences in the selection of body parts used for CA analysis may lead to potential biases in the interpretation of CA values. Cellulase activity was examined using the reducing sugar assay, as previously described (Kanaya et al 2018). Each specimen was homogenized with 5 mL of phosphate-buffered saline and centrifuged at 9100 g for 10 min.…”

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confidence: 99%

“…Notomastus), shell length (bivalves), and carapace width (crabs). ‡ Reported inKanaya et al (2018). SF, suspension feeder; SDF, surface-deposit feeder; DDF, deep-deposit feeder.a Toba & Sato (2013), b Doi et al (2005), c Kanaya et al (2008a), d Kanaya et al (2008b).…”

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Cellulase activity and stable isotope signature of benthic macroinvertebrates in estuarine habitats: potential assimilation of land-derived organic matter

Kanaya

Tanimura

Niiyama

et al. 2019

Plankton Benthos Res

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We investigated inter-species dietary variation and potential cellulose digestion of 12 macroinvertebrate taxa collected from two locations in the estuarine Idoura Lagoon, Sendai Bay. All taxa exhibited cellulase activity (CA), which was higher among surface-deposit feeders (bivalve Macoma contabulata, polychaete Tylorrhynchus osawai, and ocypodid crabs) and obligatory suspension feeders (bivalves Corbicula japonica and Nuttallia japonica) (0.108 to 0.764 µmol min −1 mg-protein −1 ). In contrast, CA was lower among facultative suspension-feeding and deep-deposit feeding polychaetes (Hediste spp. and Heteromastus sp., respectively), and was lowest in the deep-deposit feeding polychaete Notomastus sp. The stable isotope ratios of the macroinvertebrates differed among feeding groups. A δ 13 C-based isotope mixing model revealed that the major dietary component of the surface-deposit feeders was microphytobenthos (34-50%), regardless of their high CAs. Although CAs of obligatory and facultative suspension feeders were comparable to or lower than those of surface-deposit feeders, they were highly dependent on river-derived materials at the station near the freshwater input (38-59%). These results indicate that CA is a common physiological characteristic of macroinvertebrates in estuarine soft-bottom habitats, but the dietary contribution of riverine detritus is not correlated with enzymatic activity. Our findings indicate that several factors affect the realized dietary components of macroinvertebrates, including feeding mode, the selectivity of ingestion, and digestive enzyme activity.

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Section: Taxamentioning

confidence: 99%

Section: Polychaetementioning

confidence: 99%

Section: Polychaetementioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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