Feeding in spatangoids: the case of Abatus Cordatus in the Kerguelen Islands (Southern Ocean)

Pascal, Pierre-Yves; Reynaud, Yann; Poulin, Élie; Ridder, Chantal De; Saucède, Thomas

doi:10.1007/s00300-021-02841-4

Cited by 4 publications

(6 citation statements)

References 69 publications

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“…The species distribution in medium to fine sand and muddy sediments (Poulin and Féral 1995) and narrow ecological niche (Saucède et al 2017) suggest that A. cordatus has a specialized and partially selective deposit feeding strategy. In particular, comparison of ingested and surrounding sediments by metabarcoding and stable isotope ratios has shown that this species do not consume meiofauna buried in sediment but partially selects organic particles with distinct stable isotope compositions instead (Pascal et al 2021). This hence suggests that A. cordatus is a primary consumer, and does not occupy a higher trophic level, as initially suggested by its high values of δ 15 N compared to those of suspension feeders and grazers.…”

Section: Potential Trophic Links Between the Phytobenthos-based And B...mentioning

confidence: 79%

“…to the diet of the sea urchin A. cordatus was highlighted. However, this species is a deposit feeder and sediment swallower (Poulin and Féral 1995;Pascal et al 2021). The species distribution in medium to fine sand and muddy sediments (Poulin and Féral 1995) and narrow ecological niche (Saucède et al 2017) suggest that A. cordatus has a specialized and partially selective deposit feeding strategy.…”

Section: Potential Trophic Links Between the Phytobenthos-based And B...mentioning

confidence: 99%

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What is the menu today in a subantarctic kelp food web from the Kerguelen Islands? Phytodetritus, phytoplankton and phytobenthos; not living kelp

et al. 2022

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Kelp forests dominated by Macrocystis pyrifera are widely distributed in coastal waters from boreal, temperate and subantarctic regions. This widespread distribution may result in regional differences in food web structure and functioning. In temperate northern regions, where most studies on kelp forest benthic food webs have been conducted, kelp grazing is a welldocumented phenomenon and can lead to the overgrazing of M. pyrifera by sea urchins when their predators (e.g., sea otters) are absent. In contrast, little is known about their counterparts in subantarctic areas. The present study aimed to reconstruct the benthic food web of a kelp forest dominated by M. pyrifera in a subantarctic environment using stable isotope analysis. Stable carbon (δ 13 C), nitrogen (δ 15 N) and sulfur (δ 34 S) isotope ratios were measured from food sources (macrophytobenthos, suspended particulate organic matter SPOM, and sediment) and consumers (sponges, bivalves, gastropods, sedentary and mobile polychaetes, arthropods and echinoderms) which were sampled in a kelp forest of the Kerguelen archipelago. Mixing models highlighted two interconnected trophic pathways which were either supported by SPOM and resuspended macrophytobenthos detritus (bentho-pelagic), or by live micro/macrophytobenthos (phytobenthos-based). No major prey were highlighted for several consumers, indicating the existence of potential supplementary trophic pathways. No consumer relying primarily on living M. pyrifera was highlighted by the mixing models. The investigated kelp forest is hence a complex ecosystem supporting multiple trophic pathways, and direct consumption of M. pyrifera is limited. Nonetheless, M. pyrifera and other macrophytobenthos species may constitute a pool of detritus supporting several trophic pathways.

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Section: Potential Trophic Links Between the Phytobenthos-based And B...mentioning

confidence: 79%

Section: Potential Trophic Links Between the Phytobenthos-based And B...mentioning

confidence: 99%

What is the menu today in a subantarctic kelp food web from the Kerguelen Islands? Phytodetritus, phytoplankton and phytobenthos; not living kelp

et al. 2022

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“…1985; Pascal et al . 2021). If a drain tube is not surrounded by mucus, the fluid may tend to escape through sediment pores, facilitating the collapse of the centre of the trace fossil.…”

Section: Discussionmentioning

confidence: 99%

A micromorphological analysis of Bolonia lata Meunier from the Cretaceous of the Neuquén Basin (Patagonia, Argentina): new insights into the tracemaker

Giachetti,

Fernández,

Comerio

et al. 2023

Papers in Palaeontology

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Polychaetes, echinoids and gastropods have been proposed as tracemakers for Bolonia Meunier, an elongate positive epirelief trace fossil characterized by two lobes composed of biserial, subtriangular pads and a mostly heart‐shaped cross‐section. Here, the internal structure and micromorphology of Bolonia are described for the first time using serial thin sections from shallow‐marine Lower Cretaceous intervals of the Agrio Formation (Neuquén Basin, Argentina). In vertical thin sections, a conical structure of variable width extends centrally from the base to the top of the trace. In horizontal thin sections, grains are reoriented and reworked, forming a central zigzag structure. The organic matter and clays form grain aggregates representing the internal structure of individual pads of the trace fossil. The sediment has mostly been reoriented, with grains making up subcircular pods. We interpret the central conical structure as the collapse of the medial zone of the trace fossil, which could have destroyed drain tubes, especially in the absence of early cementation. Studying horizontal thin sections, we reconstruct the diagnostic biserial pads as biserial concave structures. These are interpreted as backfilling structures produced by the aboral and lateral spines of irregular echinoids, which worked together to compact the sediment anteroposteriorly and moved alternatively, explaining the zigzag pattern in the menisci. We propose Spatangoidea or Cassiduloidea (or a closely related group) with a similar burrowing ability and spine movement as tracemakers of these Bolonia specimens.

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“…Food Availability Models could be developed (Jansen et al, 2018) to estimate the proportion of organic matter that reaches the seafloor based on the knowledge of water currents. It could be also interesting to have some information about benthic detritic organic matter that the sea urchins could consume (Pascal et al, 2021). These data were, however, not available for the study area, but such models offer promising perspectives.…”

Section: Discussionmentioning

confidence: 99%

“…As a deposit-feeder, A. cordatus feeds upon organic grain coatings and particles present in sediments (Pascal et al, 2021). Seawater chlorophyll-a concentration was used as a proxy of food availability because data on the exact organic content of sediments are not available at the scale of the entire bay (Arnould-Pétré et al, 2020).…”

Section: Environmental Data: Bathymetry Chlorophyll-a Concentration A...mentioning

confidence: 99%

Classic or hybrid? The performance of next generation ecological models to study the response of Southern Ocean species to changing environmental conditions

Guillaumot

Belmaker

Buba

et al. 2022

Diversity and Distributions

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Aim In the context of intensifying threats of climate change on marine communities, ecological models are widely applied for conservation strategies, though polar studies remain scarce given the limited number of datasets available. Correlative (e.g. species distribution models, SDM) and mechanistic (e.g. dynamic energy budget models, DEB) modelling approaches are usually used independently in studies. Using both approaches in integrative, hybrid models could help to better estimate the species potential ecological niche, as mechanistic and correlative models complement each other very well, giving more insights into species potential response to fast‐changing environmental conditions. Location The study focusses on the Baie du Morbihan, a silled basin located in the east of the Kerguelen Islands (sub‐Antarctic). Methods A hybrid, correlative‐mechanistic model was implemented to predict the response of the endemic sea urchin Abatus cordatus (Verrill, 1876). We compared the performances of classic and integrated approaches to predict A. cordatus distribution according to two dates representing seasonal contrasts. Two integrated approaches were studied and performed by either (1) including the spatial projection of the DEB model as an input layer inside the SDM (‘integrated SDM‐DEB’) or (2) using a Bayesian procedure to use DEB model outputs as priors of the SDM (‘integrated Bayesian’ approach). Results Results show higher performances of ‘integrated Bayesian’ approaches to evaluate A. cordatus potential ecological niche compared with ‘classic’ and ‘integrated SDM‐DEB’ methods. The influence of environmental conditions on model predictions is further captured with these Bayesian procedures and better highlights the environmental influence on the species‐predicted distribution. Model performance is good for the different simulations, and uncertainty in predictions is well‐highlighted. Main conclusions The good performances of ‘integrated Bayesian’ approaches to estimate species potential ecological niche opens perspectives for future applications to a broad panel of natural examples, noteworthy for decision‐making and conservation management purposes.

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Feeding in spatangoids: the case of Abatus Cordatus in the Kerguelen Islands (Southern Ocean)

Cited by 4 publications

References 69 publications

What is the menu today in a subantarctic kelp food web from the Kerguelen Islands? Phytodetritus, phytoplankton and phytobenthos; not living kelp

What is the menu today in a subantarctic kelp food web from the Kerguelen Islands? Phytodetritus, phytoplankton and phytobenthos; not living kelp

A micromorphological analysis of Bolonia lata Meunier from the Cretaceous of the Neuquén Basin (Patagonia, Argentina): new insights into the tracemaker

Classic or hybrid? The performance of next generation ecological models to study the response of Southern Ocean species to changing environmental conditions

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