A trade-off between mucocytes and bacteriocytes in Loripes orbiculatus gills (Bivalvia, Lucinidae): a mixotrophic adaptation to seasonality and reproductive status in a symbiotic species?

Roques, Cécile; Grousset, Evelyse; Troussellier, Marc; Hermet, Sophie; Carrer, Johan Le; Sar, Chamroeun; Caro, Audrey

doi:10.1007/s00227-020-03768-w

Cited by 4 publications

(3 citation statements)

References 87 publications

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“…predator, grazer, suspension-feeder and deposit-feeder (Faulwetter et al, 2014)), whereas the species associated to oligotrophic lagoons, like Loripes orbiculatus, present less diverse feeding modes ( i.e. mainly based on sulfo-oxydizing bacteria (Roques et al, 2020)). This flexibility could allow organisms to better tolerate the fluctuating abiotic conditions that characterize small eutrophic lagoons, stressing that environmental stability is probably a strong driver of macrobenthic communities in coastal lagoons, as previously shown for macrophytes (Pérez-Ruzafa et al, 2011c).…”

Section: Discussionmentioning

confidence: 99%

Disentangling the effects of eutrophication and natural variability on macrobenthic communities across French coastal lagoons

Jones

Schaal

Boyé

et al. 2022

Preprint

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Coastal lagoons are transitional ecosystems that host a unique diversity of species and support many ecosystem services. Owing to their position at the interface between land and sea, they are also subject to increasing human impacts, which alter their ecological functioning. Because coastal lagoons are naturally highly variable in their environmental conditions, disentangling the effects of anthropogenic disturbances like eutrophication from those of natural variability is a challenging, yet necessary issue to address. Here, we analyze a dataset composed of macrobenthic invertebrate abundances and environmental variables (hydro-morphology, water, sediment and macrophytes) gathered across 29 Mediterranean coastal lagoons located in France to characterize the main drivers of community composition and structure. Using correlograms, linear models and variance partitioning, we found that lagoon hydro-morphology (connection to the sea and surface) which affects the level of environmental variability (salinity and temperature), as well as lagoon-scale benthic habitat diversity (using macrophyte morphotypes) seemed to regulate macrofauna distribution, while eutrophication and associated stressors like low dissolved oxygen acted upon the existing communities, mainly by reducing species richness and diversity. Furthermore, M-AMBI, a multivariate index composed of species richness, Shannon diversity and AMBI (AZTI's Marine Biotic Index) and currently used to evaluate the ecological state of French coastal lagoons, was more sensitive to eutrophication (18%) than to natural variability (9%) with nonetheless 49% of its variability explained jointly by both. Conversely, AMBI was the only tested index that uniquely responded to eutrophication variables, which nonetheless explained less than a third of its variability. To improve the robustness of benthic indicators like M-AMBI and increase the effectiveness of lagoon benthic habitat management, we call for a revision of the ecological groups at the base of the AMBI index and of the current lagoon typology which could be inspired by the lagoon-sea connection levels used in this study.

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Section: Discussionmentioning

confidence: 99%

Disentangling the effects of eutrophication and natural variability on macrobenthic communities across French coastal lagoons

Jones

Schaal

Boyé

et al. 2022

Preprint

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show abstract

“…Subsequently, it would be interesting to see if foraging red knots include more Loripes in their diet in those places. Toxicity of Loripes might also be size dependent (Roques et al 2020;Rossi et al 2013). We selected only part of the suitable sized Loripes for this experiment, but individuals outside this range might be more of less toxic and this could also be related to their depth (sulfide levels increase with sediment depth).…”

Section: Natural Variation Of Toxicitymentioning

confidence: 99%

“…We selected only part of the suitable sized Loripes for this experiment, but individuals outside this range might be more of less toxic and this could also be related to their depth (sulfide levels increase with sediment depth). Seasonality might also affect the sulfur content in Loripes and the subsequent toxin constraint (Cardini et al 2019;Roques et al 2020). Van der Geest et al (2014) showed that the contribution of the endosymbionts to the diet of Loripes is lowest in autumn and highest in spring, potentially limiting intake rates on Loripes in spring the most.…”

Section: Natural Variation Of Toxicitymentioning

confidence: 99%

Sulfur in lucinid bivalves inhibits intake rates of a molluscivore shorebird

et al. 2022

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A forager's energy intake rate is usually constrained by a combination of handling time, encounter rate and digestion rate. On top of that, food intake may be constrained when a forager can only process a maximum amount of certain toxic compounds. The latter constraint is well described for herbivores with a limited tolerance to plant secondary metabolites. In sulfidic marine ecosystems, many animals host chemoautotrophic endosymbionts, which store sulfur compounds as an energy resource, potentially making their hosts toxic to predators. The red knot Calidris canutus canutus is a molluscivore shorebird that winters on the mudflats of Banc d'Arguin, where the most abundant bivalve prey Loripes orbiculatus hosts sulfide-oxidizing bacteria. In this system, we studied the potential effect of sulfur on the red knots' intake rates, by offering Loripes with various sulfur content to captive birds. To manipulate toxicity, we starved Loripes for 10 days by removing them from their symbiont's energy source sulfide. As predicted, we found lower sulfur concentrations in starved Loripes. We also included natural variation in sulfur concentrations by offering Loripes collected at two different locations. In both cases lower sulfur levels in Loripes resulted in higher consumption rates in red knots. Over time the red knots increased their intake rates on Loripes, showing their ability to adjust to a higher intake of sulfur.

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Diachronic quantification of the local marine reservoir effect (MRE) using Loripes orbiculatus shells from Late Holocene lagoonal deposits at Puntone di Scarlino (Central Tuscany, Italy): Proposed roles of microbial diagenesis and sedimentation rates

Sevink,

Dee,

Niedospial

et al. 2024

Quaternary Geochronology

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A trade-off between mucocytes and bacteriocytes in Loripes orbiculatus gills (Bivalvia, Lucinidae): a mixotrophic adaptation to seasonality and reproductive status in a symbiotic species?

Cited by 4 publications

References 87 publications

Disentangling the effects of eutrophication and natural variability on macrobenthic communities across French coastal lagoons

Disentangling the effects of eutrophication and natural variability on macrobenthic communities across French coastal lagoons

Sulfur in lucinid bivalves inhibits intake rates of a molluscivore shorebird

Diachronic quantification of the local marine reservoir effect (MRE) using Loripes orbiculatus shells from Late Holocene lagoonal deposits at Puntone di Scarlino (Central Tuscany, Italy): Proposed roles of microbial diagenesis and sedimentation rates

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