Trophic role of large benthic sulfur bacteria in mangrove sediment

Pascal, Pierre-Yves; Dubois, Stanislas F.; Boschker, Henricus T. S.; Gros, Olivier

doi:10.3354/meps11035

Cited by 12 publications

(17 citation statements)

References 51 publications

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“…On the contrary, the cosmopolitan gnathostomulid species Haplognathia ruberrima was found in sulphur bacterial mats in Guadeloupe mangroves with δ 13 C values lower than the available measured food sources of this environment. Since no sulphur-oxidising symbionts were observed, it was suggested that the species was grazing selectively and exclusively on the free-living, sulphur-oxidising bacteria (Pascal et al 2014).…”

Section: Adaptation Of Meiofauna To Mangrove Conditionsmentioning

confidence: 99%

“…Kito and Aryuthaka (2006) described a new species of the mouthless genus Parastomonema collected in muddy sediments of a mangrove forest in Samut Songkhram, Thailand. Pascal et al (2014) studied the endofauna of bacterial mats between mangrove tree roots and found no differences in abundance with surrounding mangrove, suggesting that this chemosynthetic food source had a limited impact on the structure of the mangrove food web. Both natural isotopic compositions and a 13 C enrichment study demonstrated the uptake of bacterial mats only by associated meiofauna, mainly by rotifers and, to a lesser degree, by small polychaetes and nematodes, and not by the macrofauna (Pascal et al 2014).…”

Section: Adaptation Of Meiofauna To Mangrove Conditionsmentioning

confidence: 99%

“…Pascal et al (2014) studied the endofauna of bacterial mats between mangrove tree roots and found no differences in abundance with surrounding mangrove, suggesting that this chemosynthetic food source had a limited impact on the structure of the mangrove food web. Both natural isotopic compositions and a 13 C enrichment study demonstrated the uptake of bacterial mats only by associated meiofauna, mainly by rotifers and, to a lesser degree, by small polychaetes and nematodes, and not by the macrofauna (Pascal et al 2014). On the contrary, the cosmopolitan gnathostomulid species Haplognathia ruberrima was found in sulphur bacterial mats in Guadeloupe mangroves with δ 13 C values lower than the available measured food sources of this environment.…”

Section: Adaptation Of Meiofauna To Mangrove Conditionsmentioning

confidence: 99%

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Characteristics of meiofauna in extreme marine ecosystems: a review

et al. 2017

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Extreme marine environments cover more than 50% of the Earth's surface and offer many opportunities for investigating the biological responses and adaptations of organisms to stressful life conditions. Extreme marine environments are sometimes associated with ephemeral and unstable ecosystems, but can host abundant, often endemic and welladapted meiofaunal species. In this review, we present an integrated view of the biodiversity, ecology and physiological responses of marine meiofauna inhabiting several extreme marine environments (mangroves, submarine caves, Polar ecosystems, hypersaline areas, hypoxic/anoxic environments, hydrothermal vents, cold seeps, carcasses/sunken woods, deep-sea canyons, deep hypersaline anoxic basins [DHABs] and hadal zones). Foraminiferans, nematodes and copepods are abundant in almost all of these habitats and are dominant in deep-sea ecosystems. The presence and dominance of some other taxa that are normally less common may be typical of certain extreme conditions. Kinorhynchs are particularly well adapted to cold seeps and other environments that experience drastic changes in salinity, rotifers are well represented in polar ecosystems and loriciferans seem to be the only metazoan able to survive multiple stressors in DHABs. As well as natural processes, human activities may generate stressful conditions, including deoxygenation, acidification and rises in temperature. The behaviour and physiology of different meiofaunal taxa, such as some foraminiferans, nematode and copepod species, can provide vital information on how organisms may respond to these challenges and can provide a warning signal of anthropogenic impacts. From an evolutionary perspective, the discovery of new meiofauna taxa from extreme environments very often sheds light on phylogenetic relationships, while understanding how meiofaunal organisms are able to survive or even flourish in these conditions can explain evolutionary pathways. Finally, there are multiple potential economic benefits to be gained from ecological, biological, physiological and evolutionary studies of meiofauna in extreme environments. Despite all the advantages offered by meiofauna studies from extreme environments, there is still an urgent need to foster meiofauna research in terms of composition, ecology, biology and physiology focusing on extreme environments.

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Section: Adaptation Of Meiofauna To Mangrove Conditionsmentioning

confidence: 99%

Section: Adaptation Of Meiofauna To Mangrove Conditionsmentioning

confidence: 99%

Section: Adaptation Of Meiofauna To Mangrove Conditionsmentioning

confidence: 99%

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Characteristics of meiofauna in extreme marine ecosystems: a review

et al. 2017

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“…Haplognathia ruberrima had the lowest δ 13 C value of all of the meiofaunal grazers studied in the area: nematode, copepod, turbellarian, rotiferan (Pascal et al . ) and consequently appears to be the only local grazer with this specialized diet. Gnathostomulid abundances are higher at the discontinuity layer between the aerobic surface and the anaerobic sediment and the redox potential discontinuity layer is a site of high bacterial activity involving sulfide oxidation and sulfate reduction (Riedl ; Reise ).…”

Section: Resultsmentioning

confidence: 99%

Diet of Haplognathia ruberrima (Gnathostomulida) in a Caribbean marine mangrove

et al. 2015

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Haplognathia ruberrima is a cosmopolitan gnathostomulid species found in sulfur bacterial mats in mangroves in Guadeloupe (French West Indies). Haplognathia ruberrima presents a δ13C value lower than all measured meiofaunal grazers and lower than the available measured food sources of this environment. This low δ13C value can not be due to specific ingestion of 13C‐depleted methanogenic bacteria because abundances of those bacteria are reduced in surficial and deep sediments as revealed by δ13C of bacterial fatty acid. According to scanning electron microscope observations, no bacterial ectosymbionts were observed at the surface of the gnathostomulids, and transmission electron microscope views revealed the absence of bacterial endosymbionts. Energy‐dispersive X‐ray spectroscopy analysis detected low levels of sulfur (0.32%±0.8) in biological tissues of H. ruberrima, confirming the absence of thioautotrophic bacterial symbionts in these animals. Consequently, the low δ13C value of H. ruberrima can not be due to the presence of sulfur‐oxidizing symbionts but more probably to the selective and exclusive consumption of free‐living, sulfur‐oxidizing bacteria.

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“…In temperate shallow waters, observations reveal ingestion of filamentous sulfur bacteria by nematode (Bernard and Fenchel, 1995). A trophic role of these bacteria has also been demonstrated in a Caribbean mangrove, in which comparisons of the isotopic composition in natural conditions and after artificial enrichment revealed that sulfur bacteria were ingested by the meiofauna (Pascal et al, 2014).…”

Section: Introductionmentioning

confidence: 86%

Temporal fluctuations in the trophic role of large benthic sulfur bacteria in mangrove sediment

2016

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International audienceFilamentous sulfur bacteria of the genus Beggiatoa form large mats covering the sediment in the shallow waters of a Guadeloupean mangrove (French West Indies). The abundance of these bacteria varies over the year and their trophic role may, therefore, also vary. We investigated this variation by conducting a survey examining the stable isotopic compositions of four grazers and four food sources during nine sampling sessions in three different periods of the year. We analyzed bulk isotopic compositions for each component except for the bacterial and diatom communities, for which we carried out a compound-specific 13C analysis of phospholipid-derived fatty acids (PLFAs). Correlations between isotopic compositions revealed a predominance of diatoms in the diet of nematodes and the important role of detritus and bacteria in the diet of the polychaete Ceratocephale sp. None of the grazers had an isotopic composition correlated with that of Beggiatoa suggesting that sulfur bacteria were not a predominant part of the diet of any grazer. Beggiatoa has a large central vacuole, resulting in a very low carbon content-to-volume ratio, potentially accounting for its low level of attractiveness to grazers. Mangrove sediments are habitats rich in organic carbon, in which, the addition of a food source, such as Beggiatoa, would have a limited effect on the structure of the food web over the course of the year

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Trophic role of large benthic sulfur bacteria in mangrove sediment

Cited by 12 publications

References 51 publications

Characteristics of meiofauna in extreme marine ecosystems: a review

Characteristics of meiofauna in extreme marine ecosystems: a review

Diet of Haplognathia ruberrima (Gnathostomulida) in a Caribbean marine mangrove

Temporal fluctuations in the trophic role of large benthic sulfur bacteria in mangrove sediment

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