Potential contributions of gut microbiota to the nutrition of the detritivorous sesarmid crab Parasesarma erythodactyla

Bui, Thi Hong Hanh; Lee, Joe

doi:10.1007/s00227-015-2723-8

Cited by 16 publications

(9 citation statements)

References 69 publications

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“…On a broader scale, it is known that Δ 13 C and Δ 15 N for a variety of consumers and food sources may range from −2.7‰ to +5.5‰ and −2.4‰ to +9.2‰, respectively (McCutchan et al ). Such variations in trophic discrimination may be attributed to food chemical composition, tissue type, feeding mode, and habitat type (Caut et al ; Layman et al ) combined with selective assimilation and differential routing of various biopolymer components (Florin et al ; Bui and Lee ). While the exact mechanisms for the discrepancies still remain unclear, trophic discrimination is assumed invariable for any particular food‐consumer pair.…”

Section: Discussionmentioning

confidence: 99%

Trophic discrimination of stable isotopes and potential food source partitioning by leaf‐eating crabs in mangrove environments

Kristensen

Lee

Mangion

et al. 2017

Limnology & Oceanography

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Diet composition of leaf-eating mangrove crabs is a puzzle among mangrove ecologists. Nutrient-poor leaf litter can in most cases not support animal growth. Food partitioning (mangrove leaves, animal tissue, and microphytobenthos [MPB]) of sesarmid and ucidid mangrove crabs from eight locations in four countries was assessed using the concentration-dependent stable isotope mixing model, IsoConc. While stable C and N isotopes have the potential to track the origin and proportion of food sources for these crabs, only few values of trophic discrimination are available. This problem was addressed here for crabs foraging on leaf litter to identify discrimination values that provide a balanced diet with sufficient nutrients (i.e., N) when combined with other food sources. The data from all mangrove locations suggest that sesarmid and ucidid crabs ingest and assimilate mixtures of available food items. Leaf litter in the form of brown leaves was always the most important C source, while animal tissue in the form live and dead "prey" or MPB in the form of diatoms at the sediment surface were the dominant N sources. Model scenarios were generated to obtain the upper thresholds of trophic 13 C discrimination between the examined crab species and leaf litter, while complying with the molar C/N < 20 requirement for sustainable invertebrate nutrition. The model predicts litter 13 C discrimination thresholds of 11.5& to 16.0& for sesarmid crabs and 20.3& to 10.6& for ucidid crabs. The difference is probably caused by metabolic disparities between these two crab families. Deviations in 15 N discrimination have in most cases only minor influence on the model-based 13 C discrimination thresholds. The present findings lead us to suggest a modified Optimal Foraging Theory for leaf-eating mangrove crabs. *Correspondence: ebk@biology.sdu.dk 2097 LIMNOLOGY and OCEANOGRAPHY

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Section: Discussionmentioning

confidence: 99%

Trophic discrimination of stable isotopes and potential food source partitioning by leaf‐eating crabs in mangrove environments

Kristensen

Lee

Mangion

et al. 2017

Limnology & Oceanography

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“…Secondary metabolites such as tannins may further disrupt digestion (Linton and Greenaway, 2007). Recent studies have shed light on how leaf-eating crabs may assimilate structural C (Bui and Lee, 2015a;Bui and Lee, 2015b) but how they meet their nitrogen (N) needs remains a puzzle. This is because nutrient-poor leaf litter cannot support the growth of most macrofauna, as the C/N ratio of mangrove leaf litter is far higher than the general maximum C/N value of 17 for sustainable animal nutrition (Russell-Hunter, 1970).…”

Section: Introductionmentioning

confidence: 99%

Feeding Strategies of Mangrove Leaf-Eating Crabs for Meeting Their Nitrogen Needs on a Low-Nutrient Diet

Gao

Lee

2022

Front. Mar. Sci.

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Sesarmid crabs play an important role in mangrove biogeochemical processes due to their leaf-eating and burrowing activities. How leaf-eating mangrove crabs meet their nitrogen (N) needs remains a puzzle, as N-poor leaf litter (<1% dry weight) cannot support the growth of most macrofauna. Several strategies for overcoming this challenge have been proposed, but the actual mechanisms remain unknown. We identified two categories of leaf-eating crabs according to their feeding habits (1): species active outside their burrows during low tide - we hypothesize that they meet their N needs through consuming the microphytobenthos (MPB) (hypothesis H1); and (2) species spending most of their time inside burrows - we hypothesize that they meet their N needs through N-fixation by associated microbes (H2). To test H1, we conducted a series of feeding experiments on the sesarmid crab Parasesarma affine (model species for category 1) with 13C- and 15N-enriched MPB and mangrove leaves. P. affine relied mainly on mangrove leaves as their C source and MPB as their N source, supporting H1. Two feeding experiments on Neosarmatium smithi (model species for category 2) showed that N limitation could be ameliorated by selecting seasonally available higher-quality food items such as floral parts, or by supplements from the associated nitrogen-fixing bacteria, as identified by genomic analysis. The strategy by which leaf-eating crabs meet their N needs may make significant contribution both to the growth of crabs and to their ecosystem functions of regulating the cycling of significant nutrient elements. The stoichiometric regulations by leaf-eating crabs to meet their N needs, such as food selection, can enhance trophic efficiency and nutrient transfer rate at the community level and ultimately increase nutrient turnover rate at the ecosystem level.

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“…There is a complex interplay between host dietary lipid intake, gut microbiota characteristics, and tissue fatty acid composition [22]. It is increasingly recognized that PUFA-synthesizing bacteria genera are present in the microbiota of aquatic animals [23,24]. While decapods rely on endogenous biosynthesis activities and/or exogenous dietary intake for the supply of LC-PUFA, it is not inconceivable that the host gut microbiota may play a requisite role.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analyses of Scylla Olivacea Gut Microbiota Composition and Function Suggest the Capacity for Polyunsaturated Fatty Acid Biosynthesis

Lau

Ting

Sam

et al. 2022

Preprint

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Multiple studies have linked lipid metabolism with intestinal bacterial structure in aquatic organisms. However, the possibility of the gut microbiota participating in synthesizing beneficial long-chain polyunsaturated fatty acid (LC-PUFA) remains vague. We profiled the gut microbiota of mud crab Scylla olivacea fed with either a LC-PUFA rich diet (FO), a LC-PUFA-poor but C18-PUFA substrate rich diet (LOCO), and diet with a similar profile as LOCO but with the inclusion of an antibiotic, oxolinic acid. Additionally, the microbiota of wild-caught S. olivacea was also analyzed. Compared to diet FO treatment, crabs fed diet LOCO contain a higher proportion of Proteobacteria, represented by Vibrio and Shewanella, two known taxonomy groups with PUFA biosynthesis capacity. Annotation of metagenomic datasets also suggests functional contribution by these two genera in terms of the KEGG pathway of unsaturated fatty acids biosynthesis and the keto-acyl synthase domains in the microbiota of LOCO treatment. Diet LOCOAB impeded the presence of Vibrio and Shewanella within the gut, and concurrently, the abundance of PUFA biosynthesis pathway-related genes. However, there was an increase in the function of short-chain fatty acids production within this diet, which was accompanied by a shift towards the abundance of phyla Bacteroidota and Spirochaetota, represented by Sunxiuqinia and Carboxylicivirga and Sediminispirochaeta, respectively. Collectively, these results exemplified bacterial communities and their corresponding PUFA biosynthesis pathways in the microbiota of a farmed crustacean species.

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Potential contributions of gut microbiota to the nutrition of the detritivorous sesarmid crab Parasesarma erythodactyla

Cited by 16 publications

References 69 publications

Trophic discrimination of stable isotopes and potential food source partitioning by leaf‐eating crabs in mangrove environments

Trophic discrimination of stable isotopes and potential food source partitioning by leaf‐eating crabs in mangrove environments

Feeding Strategies of Mangrove Leaf-Eating Crabs for Meeting Their Nitrogen Needs on a Low-Nutrient Diet

Comparative Analyses of Scylla Olivacea Gut Microbiota Composition and Function Suggest the Capacity for Polyunsaturated Fatty Acid Biosynthesis

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