Transport pathways of microphytobenthos-originating organic carbon in the food web of an exposed hard bottom shore in the Seto Inland Sea, Japan

Takai, Noriyuki; Yorozu, Akemi; Tanimoto, Terumi; Hoshika, Akira; Yoshihara, Kiyoshi

doi:10.3354/meps284097

Cited by 31 publications

(24 citation statements)

References 16 publications

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“…Researchers studying the rocky inter‐tidal zone in a region of the Sea of Japan demonstrated how the physical resuspension of microphytobenthos caused significant 13 C enrichment in the suspended particulates, and in that case this enrichment was reflected in the local suspension‐feeders (Takai et al . ). However, mismatches between isotopic signatures of food and benthic consumers are not uncommon in the literature ( e.g .…”

Section: Discussionmentioning

confidence: 97%

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Temporal variability in the isotopic niches of rocky shore grazers and suspension‐feeders

Richoux

Ndhlovu

2014

Marine Ecology

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Carbon and nitrogen stable isotope ratios were measured in rocky inter‐tidal suspension‐feeders (brown mussels and cape reef worms) and grazers (goat's eye limpets and cape sea urchins) to determine the influences of lifestyle and time on the diets of consumers. Niche partitioning between consumer species within the same feeding guild was assessed using isotopic niche area (a proxy for trophic niche). Specimens were collected monthly at a single site in Southeastern South Africa from July 2010 to June 2011. Temporal variations in isotopic signatures were generally greater in the suspension‐feeders compared with the grazers, isotopic niche widths were smaller in the suspension‐feeders and intra‐population variations in isotope signatures were larger in the grazers. No inter‐specific niche overlap (according to standard ellipse areas) was observed within either feeding guild unless standardization calculations were used. Temporal variations in the diets of all the consumers appeared uncoupled from temporal variability in the isotopic signatures of basal resources in the region; as such, shifts in the consumer diets most likely pertained to feeding behaviour and food preferences. Our data provide new insights into how syntopic rocky shore consumers coexist by partitioning their temporally variable food environment.

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Section: Discussionmentioning

confidence: 97%

“…; Rolff ; Takai et al . ; Nordström et al . ), whereas consumer diets can be greatly dampened by their relatively slow tissue turnover rates (Rolff ; O'Reilly et al .…”

Section: Discussionmentioning

confidence: 99%

Temporal variability in the isotopic niches of rocky shore grazers and suspension‐feeders

Richoux

Ndhlovu

2014

Marine Ecology

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“…MPB carbon can be traced through grazers, suspension feeders, and carnivores using natural stable isotope abundance (Takai et al 2004), indicating a significant contribution to higher trophic levels. MPB provide a food resource for deposit feeders and suspen-sion feeders, as a substantial proportion of the MPB is regularly re-suspended in many coastal systems (De Jonge & Van Beusekom 1992, Guarini et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Measurement of acid polysaccharides (APS) associated with microphytobenthos in salt marsh sediments

Thornton¹,

Visser²

2009

Aquat. Microb. Ecol.

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Microphytobenthos (MPB) are an important component of shallow-water habitats where there is sufficient light to support benthic photosynthesis. Production of extracellular polymeric substances (EPS) is characteristic of the MPB, and acid polysaccharides (APS) are a major component of these EPS. A simple technique was developed to extract and measure APS concentrations in sediments. Water-extractable APS (wAPS) were extracted with ultra high purity water from lyophilized sediments. After centrifuging to remove the sediment, wAPS in the supernatant was precipitated with alcian blue, a cationic dye. The APS-alcian blue precipitate was removed by filtration. The remaining alcian blue in solution was determined spectrophotometrically and was inversely proportional to the concentration of wAPS in the sediment. Chlorophyll (chl) a, carbohydrate fractions, and wAPS were measured in sediments from 5 contrasting sites in a microtidal salt marsh in the subtropics. wAPS concentrations, expressed as gum xanthan equivalents, ranged from 152 to 6268 mg m -2 in the upper 5 mm of sediment. The biomass (determined as chl a) of MPB at all sites was highest in the winter compared to the summer. There was a significant correlation (r = 0.675, p < 0.001, n = 107) between sediment wAPS and chl a concentrations. The ratio of wAPS to salineextractable EPS (sEPS) was significantly higher in summer compared to winter, indicating a seasonal change in the composition of EPS. These data show that APS are a significant and variable component of the EPS pool in salt marsh sediments. KEY WORDS: Exopolymers · EPS · Microphytobenthos · Colloidal carbohydrate · Alcian blue · Subtropics · Gulf of Mexico Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 54: [185][186][187][188][189][190][191][192][193][194][195][196][197][198] 2009 sion feeders, as a substantial proportion of the MPB is regularly re-suspended in many coastal systems (De Jonge & Van Beusekom 1992, Guarini et al. 2004. Middelburg et al. (2000) used a pulse-chase 13 C tracer approach and found that carbon was rapidly transferred (within 1 h) from MPB to bacteria and nematodes within the sediment at a site that was dominated by diatoms. Middelburg et al. (2000) concluded that MPB have a 'central role' in 'moderating carbon flow in coastal sediments. ' A significant proportion of the carbon fixed by the MPB during photosynthesis is exuded into the surrounding environment, mainly as carbohydrates (Smith & Underwood 1998, De Brouwer et al. 2002, Bellinger et al. 2005. These carbohydrates are in the form of extracellular polymeric substances (EPS) and low molecular weight fractions. The terms 'extracellular polymeric substances,' 'exopolymeric substances,' and 'exopolymers' are used interchangeably in the literature and are all abbreviated to EPS. There is considerable interest in the biogeochemistry of EPS in marine ecosystems, both in the water column and in sediments. Verdugo et al. (2004) estimated that there are 70 Pg of ca...

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“…In intertidal rocky shores, the biofilm is a source of energy for benthic and pelagic trophic webs (Nagarkar et al, 2004;Takai et al, 2004;Doi et al, 2008), is the pioneer assemblage in the succession of the benthic assemblage (MacLulich, 1986;Bulleri, 2004) and it facilitates the settlement of propagules of macroalgae and invertebrates (Huang and Boney, 1984;Hill and Hawkins, 1991;Hung et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Abundance of biofilm on intertidal rocky shores: Can trampling by humans be a negative influence?

Leite

Ciotti

Christofoletti

2012

Marine Environmental Research

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Transport pathways of microphytobenthos-originating organic carbon in the food web of an exposed hard bottom shore in the Seto Inland Sea, Japan

Cited by 31 publications

References 16 publications

Temporal variability in the isotopic niches of rocky shore grazers and suspension‐feeders

Temporal variability in the isotopic niches of rocky shore grazers and suspension‐feeders

Measurement of acid polysaccharides (APS) associated with microphytobenthos in salt marsh sediments

Abundance of biofilm on intertidal rocky shores: Can trampling by humans be a negative influence?

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