Food web analysis in intertidal Zostera marina and Zostera noltii communities in winter and summer

Ouisse, Vincent; Riera, Pascal; Migné, Aline; Leroux, Cédric; Davoult, Dominique

doi:10.1007/s00227-011-1796-2

Cited by 31 publications

(26 citation statements)

References 35 publications

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“…This agrees well with results for macrobenthos from the same ecosystem (Vafeiadou et al, 2013a). Seagrass vegetation has important indirect effects on resource availability, for instance, through substrate formation and through the enhancement of SPOM sedimentation (Ouisse et al, 2012). However, seagrass detritus and SPOM are also exported from seagrass beds to adjacent or even more distant locations (Hemminga et al, 1994;Heck et al, 2008).…”

Section: Resource Utilization By Meiobenthos Inside and Adjacent To Zsupporting

confidence: 89%

“…Several studies during the last decade have used natural stable isotope ratios to elucidate the principal food sources of macrobenthos in seagrass beds, stressing the importance of seagrass-associated sources and/or microphytobenthos (MPB) (Lepoint et al, 2000;Kharlamenko et al, 2001;Moncreiff and Sullivan, 2001;Baeta et al, 2009;Carlier et al, 2009;Lebreton et al, 2011;Ouisse et al, 2012;Vafeiadou et al, 2013a). Less information is available for meiobenthos resource utilization in seagrass beds (Vizzini et al, 2000b(Vizzini et al, , 2002aBaeta et al, 2009;Leduc et al, 2009;Lebreton et al, 2011Lebreton et al, , 2012, with none of the studies including meiofauna at the level of feeding types, families, genera or species.…”

Section: Introductionmentioning

confidence: 99%

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Resource utilization and trophic position of nematodes and harpacticoid copepods in and adjacent to <i>Zostera noltii</i> beds

et al. 2014

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Abstract. This study examines the resource use and trophic position of nematodes and harpacticoid copepods at the genus/species level in an estuarine food web in Zostera noltii beds and in adjacent bare sediments using the natural abundance of stable carbon and nitrogen isotopes. Microphytobenthos and/or epiphytes are among the main resources of most taxa, but seagrass detritus and sediment particulate organic matter contribute as well to meiobenthos nutrition, which are also available in deeper sediment layers and in unvegetated patches close to seagrass beds. A predominant dependence on chemoautotrophic bacteria was demonstrated for the nematode genus Terschellingia and the copepod family Cletodidae. A predatory feeding mode is illustrated for Paracomesoma and other Comesomatidae, which were previously considered first-level consumers (deposit feeders) according to their buccal morphology. The considerable variation found in both resource use and trophic level among nematode genera from the same feeding type, and even among congeneric nematode species, shows that the interpretation of nematode feeding ecology based purely on mouth morphology should be avoided.

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Section: Resource Utilization By Meiobenthos Inside and Adjacent To Zsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Resource utilization and trophic position of nematodes and harpacticoid copepods in and adjacent to <i>Zostera noltii</i> beds

et al. 2014

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“…At present, several approaches, such as gut content analysis, lab culture analysis, and stable isotope analysis (SIA) of carbon and nitrogen within bulk tissues, are available to identify the trophic position (TP) of organisms of interest in the food webs of seagrass meadow ecosystems (Lugendo et al ; Shang et al ; Olsen et al ; Unabia ; Ouisse et al ). In gut content analysis, although it is highly useful to directly identify the species on which the investigated consumers actually feed, the remaining materials in the gut do not always correspond to the major diet sources adopted by consumers because heavily digested materials prevent identification of the resource species.…”

mentioning

confidence: 99%

“…These meadows serve as shelters for various marine animals including crustaceans, bivalves, and fish, particularly as nursery and spawning sites for these animals (Irlandi 1997;Rooker et al 1998;Hovel and Lipcius 2001;Hovel and Fonseca 2005). Furthermore, seagrass may directly or indirectly supply the diet of various animals in the ecosystem, as seagrass detritus is an abundant resource and can significantly contribute to the diet of certain benthic consumers (Olsen et al 2011;Ouisse et al 2012). However, several previous studies have mentioned a limited contribution of seagrass to the direct diet resources of benthic consumers because of a high content of indigestible cellulose with a high C-to-N ratio (Kang et al 2003;Shang et al 2008).…”

mentioning

confidence: 99%

Trophic interaction among organisms in a seagrass meadow ecosystem as revealed by bulk δ¹³C and amino acid δ¹⁵N analyses

Choi

Lee

et al. 2017

Limnology & Oceanography

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Numerous studies have used stable isotope analysis (SIA) of carbon and nitrogen within the bulk tissues of organisms to determine the trophic structure among organisms in a food web. Recently, SIA has evolved to compound‐specific stable isotope analysis (CSIA) of nitrogen within amino acids to significantly reduce the uncertainty in the estimated trophic position (TP) of organisms based on the isotopic difference between glutamic acid and phenylalanine within a single organism. However, because the initial offset (β) between glutamic acid and phenylalanine differs between aquatic algae (ca. +3.4‰) and vascular plants (ca. −8.4‰) in food webs that rely on both resources, β should be replaced by a value adapted to the admixture of primary producers for each specimen. In this study, we established a new method involving the β value (βmix) of each consumer specimen determined based on its bulk tissue δ13C value and successfully obtained realistic TPs (TPmix) for organisms in a complex seagrass meadow food web. Remarkable differences between the TPmix and traditional TPalgal values were found in deposit feeders due to the large contribution of seagrass to their basal resources. The estimated TPs of organisms increased by up to 1.5 units (from TPalgal to TPmix), in terms of trophic transfer, when their diets included substantial seagrass‐derived contributions. Thus, combinatorial analysis of the amino acid δ15N and specimen‐specific βmix values provides better understanding of the trophic interactions in food webs, even in complex seagrass meadow ecosystems.

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“…Another study in the same region documented, over 3 weeks, a mean diurnal amplitude in pH of 0.34, but with extreme diurnal fluctuations of up to 0.6, and a minimum pH of 7.26 (Saderne et al, 2013). That study was conducted in a shallow algal and seagrass habitat, typical of that in which A. punctata is found (Carefoot, 1987;Ouisse et al, 2012). Therefore, the chosen low pH treatment of 7.3 is likely close to the minimum pH experienced by this species in this region, albeit periodically.…”

Section: Introductionmentioning

confidence: 96%

Sea HareAplysia punctata(Mollusca: Gastropoda) Can Maintain Shell Calcification under Extreme Ocean Acidification

Carey

Dupont

Sigwart

2016

The Biological Bulletin

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Abstract. Ocean acidification is expected to cause energetic constraints upon marine calcifying organisms such as molluscs and echinoderms, because of the increased costs of building or maintaining shell material in lower pH. We examined metabolic rate, shell morphometry, and calcification in the sea hare Aplysia punctata under short-term exposure (19 days) to an extreme ocean acidification scenario (pH 7.3, ϳ2800 atm pCO 2 ), along with a group held in control conditions (pH 8.1, ϳ344 atm pCO 2 ). This gastropod and its congeners are broadly distributed and locally abundant grazers, and have an internal shell that protects the internal organs. Specimens were examined for metabolic rate via closed-chamber respirometry, followed by removal and examination of the shell under confocal microscopy. Staining using calcein determined the amount of new calcification that occurred over 6 days at the end of the acclimation period. The width of new, pre-calcified shell on the distal shell margin was also quantified as a proxy for overall shell growth. Aplysia punctata showed a 30% reduction in metabolic rate under low pH, but calcification was not affected. This species is apparently able to maintain calcification rate even under extreme low pH, and even when under the energetic constraints of lower metabolism.This finding adds to the evidence that calcification is a largely autonomous process of crystallization that occurs as long as suitable haeomocoel conditions are preserved. There was, however, evidence that the accretion of new, noncalcified shell material may have been reduced, which would lead to overall reduced shell growth under longerterm exposures to low pH independent of calcification. Our findings highlight that the chief impact of ocean acidification upon the ability of marine invertebrates to maintain their shell under low pH may be energetic constraints that hinder growth of supporting structure, rather than maintenance of calcification.

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Food web analysis in intertidal Zostera marina and Zostera noltii communities in winter and summer

Cited by 31 publications

References 35 publications

Resource utilization and trophic position of nematodes and harpacticoid copepods in and adjacent to <i>Zostera noltii</i> beds

Resource utilization and trophic position of nematodes and harpacticoid copepods in and adjacent to <i>Zostera noltii</i> beds

Trophic interaction among organisms in a seagrass meadow ecosystem as revealed by bulk δ¹³C and amino acid δ¹⁵N analyses

Sea HareAplysia punctata(Mollusca: Gastropoda) Can Maintain Shell Calcification under Extreme Ocean Acidification

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Food web analysis in intertidal Zostera marina and Zostera noltii communities in winter and summer

Cited by 31 publications

References 35 publications

Resource utilization and trophic position of nematodes and harpacticoid copepods in and adjacent to &lt;i&gt;Zostera noltii&lt;/i&gt; beds

Resource utilization and trophic position of nematodes and harpacticoid copepods in and adjacent to &lt;i&gt;Zostera noltii&lt;/i&gt; beds

Trophic interaction among organisms in a seagrass meadow ecosystem as revealed by bulk δ13C and amino acid δ15N analyses

Sea HareAplysia punctata(Mollusca: Gastropoda) Can Maintain Shell Calcification under Extreme Ocean Acidification

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Resource utilization and trophic position of nematodes and harpacticoid copepods in and adjacent to <i>Zostera noltii</i> beds

Resource utilization and trophic position of nematodes and harpacticoid copepods in and adjacent to <i>Zostera noltii</i> beds

Trophic interaction among organisms in a seagrass meadow ecosystem as revealed by bulk δ¹³C and amino acid δ¹⁵N analyses