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Article: Two new species of mud dragons (Scalidophora: Kinorhyncha) inhabiting a human-impacted mangrove from Mayotte (Southwestern Indian Ocean)

Cepeda, Diego / González-Casarrubios, Alberto / Sánchez, Nuria / Spedicato, Adriana / Michaud, Emma / Zeppilli, Daniela

Zoologischer Anzeiger. 2022 Nov., v. 301

2022

Abstract: The Kinorhyncha community inhabiting a mangrove forest impacted by domestic sewage discharges in the past has been explored in Mayotte Archipelago (southwestern Indian Ocean). Two new species of Echinoderes, which putatively belong to the Echinoderes ... ...

Abstract	The Kinorhyncha community inhabiting a mangrove forest impacted by domestic sewage discharges in the past has been explored in Mayotte Archipelago (southwestern Indian Ocean). Two new species of Echinoderes, which putatively belong to the Echinoderes coulli-group, are described: E. cyaneafictus sp. nov. And E. parthenope sp. nov. Echinoderes cyaneafictus sp. nov. has short, poorly sclerotized, weakly articulated spines in middorsal position on segment 4 and sublateral position on segments 6–7, plus tubes in lateroventral position on segment 5, lateral accessory position on segment 8 and laterodorsal position on segment 10. Echinoderes parthenope sp. nov. has the same kind of spines in middorsal position on segment 4, lateroventral position on segment 6, sublateral position on segment 7 and lateral accessory position on segment 8, plus tubes in lateroventral position on segments 5 and 8 and laterodorsal position on segment 10 (only males). Both species are characterized by having an enlarged sieve plate (nephridiopore) consisting of an anterior, convex area with numerous pores and a posterior, concave region with a single pore, which characterises the species group. This combination of characters, together with their intertidal environment affected by strong salinity fluctuations, led us to assign both species to the E. coulli-group tentatively. Apart from these characters, the new species possess a unique combination of morphological features that unambiguously differentiates them from their congeners. The studied kinorhynch community seems not to be negatively affected by the domestic sewage emissions from the nearby town Malamani. We did not find evidence for significant differences in density or richness between the area more impacted by this pollution and the more pristine area.
Keywords	littoral zone ; mangrove forests ; new species ; pollution ; salinity ; sclerotization ; sewage ; Comoros ; Indian Ocean
Language	English
Dates of publication	2022-11
Size	p. 23-41.
Publishing place	Elsevier GmbH
Document type	Article
ZDB-ID	398-0
ISSN	1873-2674 ; 0044-5231
ISSN (online)	1873-2674
ISSN	0044-5231
DOI	10.1016/j.jcz.2022.09.001
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Deciphering environmental forcings in the distribution of meiofauna and nematodes in mangroves of the Atlantic-Caribbean-East Pacific and Indo-West Pacific regions.

Spedicato, Adriana / Zeppilli, Daniela / Thouzeau, Gérard / Cuny, Philippe / Militon, Cécile / Sylvi, Léa / Hubas, Cédric / Dirberg, Guillaume / Jézéquel, Ronan / Barrière, Guerric / Michel, Loïc N / Bezerra, Tânia Nara / Michaud, Emma

The Science of the total environment

2024 Volume 930, Page(s) 172612

Abstract: Mangroves develop under environmental conditions and anthropogenic pressures whose impact on benthic meiofauna remains poorly understood. It is unclear how meiofauna communities are structured according to local sedimentary conditions. This study was ... ...

Abstract	Mangroves develop under environmental conditions and anthropogenic pressures whose impact on benthic meiofauna remains poorly understood. It is unclear how meiofauna communities are structured according to local sedimentary conditions. This study was designed to characterize the community structure of meiofauna and nematodes (dominant taxa) and the associated environmental forcings in intertidal mangrove sediments from Mayotte (Indo-West-Pacific), Martinique and Guadeloupe (Caribbean). Sediment cores were sampled at the end of the dry season at low tide on adult mangrove stands with similar immersion time. In each sediment layer, we analyzed redox potential, pH, porewater salinity, grain size, organic matter, metals, organic contaminants, prokaryotes and meiofauna. Our results show that sediments far from cities and agricultural fields trapped site-specific contaminants due to local water transport processes. Some metals, PAHs or pesticides exceeded toxicity thresholds in most of the studied stations, thus being harmful to benthic fauna. The sedimentary environment acts as a filter selecting specific meiofauna communities at station scale only in the Caribbean. In Mayotte, horizontal homogeneity contrasts with vertical heterogeneity of the sedimentary environment and the meiofauna. Nematode genera showed particular distribution patterns horizontally and vertically, suggesting the presence of sediment patches suitable for a restricted pool of genera on each island. Results in the Caribbean are consistent with nested diversity patterns due to environmental filtering. Conversely, horizontal homogeneity at Mayotte would reflect greater dispersal between stations or more spatially homogeneous anthropogenic pressures. The nematode genera present at depth may not be the most specialized, but the most versatile, capable of thriving in different conditions. Terschellingia and Daptonema showed contrasted responses to environmental forcing, likely due to their versatility, while Desmodora showed uniform responses between study areas, except when toxicity thresholds were exceeded. Our results emphasize that a given genus of nematode may respond differently to sedimentary conditions depending on sites.
Language	English
Publishing date	2024-04-23
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2024.172612
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Article ; Online: Uncovering potential mangrove microbial bioindicators to assess urban and agricultural pressures on Martinique island in the eastern Caribbean Sea.

Fiard, Maud / Militon, Cécile / Sylvi, Léa / Migeot, Jonathan / Michaud, Emma / Jézéquel, Ronan / Gilbert, Franck / Bihannic, Isabelle / Devesa, Jeremy / Dirberg, Guillaume / Cuny, Philippe

The Science of the total environment

2024 Volume 928, Page(s) 172217

Abstract: Martinique's mangroves, which cover 1.85 ha of the island (<0.1 % of the total area), are considerably vulnerable to local urban, agricultural, and industrial pollutants. Unlike for temperate ecosystems, there are limited indicators that can be used to ... ...

Abstract	Martinique's mangroves, which cover 1.85 ha of the island (<0.1 % of the total area), are considerably vulnerable to local urban, agricultural, and industrial pollutants. Unlike for temperate ecosystems, there are limited indicators that can be used to assess the anthropogenic pressures on mangroves. This study investigated four stations on Martinique Island, with each being subject to varying anthropogenic pressures. An analysis of mangrove sediment cores approximately 18 cm in depth revealed two primary types of pressures on Martinique mangroves: (i) an enrichment in organic matter in the two stations within the highly urbanized bay of Fort-de-France and (ii) agricultural pressure observed in the four studied mangrove stations. This pressure was characterized by contamination, exceeding the regulatory thresholds, with dieldrin, total DDT, and metals (As, Cu and Ni) found in phytosanitary products. The mangroves of Martinique are subjected to varying degrees of anthropogenic pressure, but all are subjected to contamination by organochlorine pesticides. Mangroves within the bay of Fort-de-France experience notably higher pressures compared to those in the island's northern and southern regions. In these contexts, the microbial communities exhibited distinct responses. The microbial biomass and the abundance of bacteria and archaea were higher in the two less-impacted stations, while in the mangrove of Fort-de-France, various phyla typically associated with polluted environments were more prevalent. These differences in the microbiota composition led to the identification of 65 taxa, including Acanthopleuribacteraceae, Spirochaetaceae, and Pirellulaceae, that could potentially serve as indicators of an anthropogenic influence on the mangrove sediments of Martinique Island.
MeSH term(s)	Environmental Monitoring/methods ; Martinique ; Wetlands ; Agriculture ; Water Pollutants, Chemical/analysis ; Geologic Sediments/microbiology ; Geologic Sediments/chemistry ; Microbiota
Chemical Substances	Water Pollutants, Chemical
Language	English
Publishing date	2024-04-06
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2024.172217
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Article: Assessing the relationship between macro-faunal burrowing activity and mudflat geomorphology from UAV-based Structure-from-Motion photogrammetry

Brunier, Guillaume / Anthony, Edward J / Fleury, Jules / Gardel, Antoine / Michaud, Emma / Morvan, Sylvain

Remote sensing of environment. 2020 May, v. 241

2020

Abstract: Characterisation of the ecosystem functioning of mudflats requires insight on the morphology and facies of these coastal features, but also on biological processes that influence mudflat geomorphology, such as crab bioturbation and the formation of ... ...

Abstract	Characterisation of the ecosystem functioning of mudflats requires insight on the morphology and facies of these coastal features, but also on biological processes that influence mudflat geomorphology, such as crab bioturbation and the formation of benthic biofilms, as well as their heterogeneity at cm or less scales. Insight into this fine scale of ecosystem functioning is also important as far as minimizing errors in upscaling are concerned. The realisation of high-resolution ground surveys of these mudflats without perturbing their surface is a real challenge. Here, we address this challenge using UAV-supported photogrammetry based on the Structure-from-Motion (SfM) workflow. We produced a Digital Surface Model (DSM) and an orthophotograph at 1 cm and 0.5 cm pixel resolutions, respectively, of a mudflat in French Guiana, and mapped and classed into different size ranges intricate morphological features, including crab burrow apertures, tidal drainage creeks and depressions. We also determined subtle facies and elevation changes and slopes, and the footprint of different degrees of benthic biofilm development. The results generated at this scale of photogrammetric analysis also enabled us to relate macrofaunal crab burrowing activity to various parameters, including mudflat elevation, spatial distribution and sizes of creeks and depressions, benthic biofilm distribution, and flooding duration. SfM photogrammetry offers interesting new perspectives in fine-scale characterisation of the geomorphology, benthic activity and degree of biofilm development of dynamic muddy intertidal environments that are generally difficult of access. The main shortcomings highlighted in this study are a drift of accuracy of the DSM outside areas of ground control points and the deployment of which perturb the mudflat morphology and biology, the water-logged or very wet surfaces which generate reconstruction artefacts through the sun glint effect, and the time-consuming task of manual interpretation of extraction of features such as crab burrow apertures. On-going developments in UAV positioning integrating RTK/PPK GPS solutions for image-georeferencing and precise orientation with high-quality inertial measurement units will limit the difficulties inherent to ground control points, while conduction of surveys during homogeneous cloudy conditions could reduce the sun-glint effect. Manual extraction of image features could be automated in the future through the use of deep-learning algorithms.
Keywords	algorithms ; automation ; biofilm ; bioturbation ; burrowing ; burrows ; crabs ; drainage ; ecological footprint ; fauna ; flooded conditions ; geomorphology ; global positioning systems ; littoral zone ; models ; orthophotography ; photogrammetry ; remote sensing ; streams ; surveys ; unmanned aerial vehicles ; French Guiana
Language	English
Dates of publication	2020-05
Publishing place	Elsevier Inc.
Document type	Article
ZDB-ID	431483-9
ISSN	0034-4257
ISSN	0034-4257
DOI	10.1016/j.rse.2020.111717
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Land-use changes in Amazon and Atlantic rainforests modify organic matter and black carbon compositions transported from land to the coastal ocean.

Soares Gonçalves Serafim, Tassiana / Gomes de Almeida, Marcelo / Thouzeau, Gérard / Michaud, Emma / Niggemann, Jutta / Dittmar, Thorsten / Seidel, Michael / de Rezende, Carlos Eduardo

The Science of the total environment

2023 Volume 878, Page(s) 162917

Abstract: This study assessed black carbon (BC) dynamics, concentrations, and the organic matter (OM) isotopic carbon composition in northeastern South America drainage basin coastal sediments. Paraíba do Sul (PSR; Atlantic Rainforest, Brazil) coastal sediments ... ...

Abstract	This study assessed black carbon (BC) dynamics, concentrations, and the organic matter (OM) isotopic carbon composition in northeastern South America drainage basin coastal sediments. Paraíba do Sul (PSR; Atlantic Rainforest, Brazil) coastal sediments displayed more
Language	English
Publishing date	2023-03-17
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2023.162917
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Article: Benthic macrofaunal bioturbation activities from shelf to deep basin in spring to summer transition in the Arctic Ocean

Oleszczuk, Barbara / Michaud, Emma / Morata, Nathalie / Renaud, Paul E / Kędra, Monika

Marine environmental research. 2019 Sept., v. 150

2019

Abstract: The aim of this study was to assess bioturbation rates in relation to macrozoobenthos and environmental variables in the Svalbard fjords, Barents Sea and Nansen Basin during spring to summer transition. The results showed differences in benthic community ...

Abstract	The aim of this study was to assess bioturbation rates in relation to macrozoobenthos and environmental variables in the Svalbard fjords, Barents Sea and Nansen Basin during spring to summer transition. The results showed differences in benthic community structure across sampled area in relation to sediment type and phytopigment content. Fjords, Barents Sea and the shallow parts of Nansen Basin (<400 m) were characterized by high functional groups diversity, and by biodiffusive and non-local rates ranging from 0.05 to 1.75 cm−2 y−1 and from 0.2 to 3.2 y−1, respectively. The deeper parts of Nansen Basin (>400m), dominated by conveyors species, showed only non-local transport rates (0.1–1 y−1). Both coefficients intensity varied with benthic biomass. Non-local transport increased with species richness and density and at stations with mud enriched by fresh phytopigments, whereas biodiffusion varied with sediment type and organic matter quantity. This study quantified for the first time the two modes of sediment mixing in the Arctic, each of which being driven by different environmental and biological situations.
Keywords	basins ; benthic organisms ; biomass ; bioturbation ; community structure ; conveyors ; environmental factors ; fauna ; mixing ; organic matter ; sediments ; species richness ; spring ; summer ; Arctic region ; Barents Sea ; Norway
Language	English
Dates of publication	2019-09
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	1502505-6
ISSN	1879-0291 ; 0141-1136
ISSN (online)	1879-0291
ISSN	0141-1136
DOI	10.1016/j.marenvres.2019.06.008
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Article ; Online: Benthic macrofaunal bioturbation activities from shelf to deep basin in spring to summer transition in the Arctic Ocean.

Oleszczuk, Barbara / Michaud, Emma / Morata, Nathalie / Renaud, Paul E / Kędra, Monika

Marine environmental research

2019 Volume 150, Page(s) 104746

Abstract	The aim of this study was to assess bioturbation rates in relation to macrozoobenthos and environmental variables in the Svalbard fjords, Barents Sea and Nansen Basin during spring to summer transition. The results showed differences in benthic community structure across sampled area in relation to sediment type and phytopigment content. Fjords, Barents Sea and the shallow parts of Nansen Basin (<400 m) were characterized by high functional groups diversity, and by biodiffusive and non-local rates ranging from 0.05 to 1.75 cm
MeSH term(s)	Animals ; Arctic Regions ; Biomass ; Invertebrates ; Oceans and Seas ; Population Dynamics ; Seasons ; Svalbard
Language	English
Publishing date	2019-06-10
Publishing country	England
Document type	Journal Article
ZDB-ID	1502505-6
ISSN	1879-0291 ; 0141-1136
ISSN (online)	1879-0291
ISSN	0141-1136
DOI	10.1016/j.marenvres.2019.06.008
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Article: Easily Implemented Methods of Radiometric Corrections for Hyperspectral–UAV—Application to Guianese Equatorial Mudbanks Colonized by Pioneer Mangroves

Jaud, Marion / Sicot, Guillaume / Brunier, Guillaume / Michaud, Emma / Le Dantec, Nicolas / Ammann, Jérôme / Grandjean, Philippe / Launeau, Patrick / Thouzeau, Gérard / Fleury, Jules / Delacourt, Christophe

Remote Sensing. 2021 Nov. 26, v. 13, no. 23

2021

Abstract: Hyper-DRELIO (Hyperspectral DRone for Environmental and LIttoral Observations) is a custom, mini-UAV (unmanned aerial vehicle) platform (<20 kg), equipped with a light push broom hyperspectral sensor combined with a navigation module measuring position ... ...

Abstract	Hyper-DRELIO (Hyperspectral DRone for Environmental and LIttoral Observations) is a custom, mini-UAV (unmanned aerial vehicle) platform (<20 kg), equipped with a light push broom hyperspectral sensor combined with a navigation module measuring position and orientation. Because of the particularities of UAV surveys (low flight altitude, small spatial scale, and high resolution), dedicated pre-processing methods have to be developed when reconstructing hyperspectral imagery. This article presents light, easy-implementation, in situ methods, using only two Spectralon® and a field spectrometer, allowing performance of an initial calibration of the sensor in order to correct “vignetting effects” and a field standardization to convert digital numbers (DN) collected by the hyperspectral camera to reflectance, taking into account the time-varying illumination conditions. Radiometric corrections are applied to a subset of a dataset collected above mudflats colonized by pioneer mangroves in French Guiana. The efficiency of the radiometric corrections is assessed by comparing spectra from Hyper-DRELIO imagery to in situ spectrometer measurements above the intertidal benthic biofilm and mangroves. The shapes of the spectra were consistent, and the spectral angle mapper (SAM) distance was 0.039 above the benthic biofilm and 0.159 above the mangroves. These preliminary results provide new perspectives for quantifying and mapping the benthic biofilm and mangroves at the scale of the Guianese intertidal mudbanks system, given their importance in the coastal food webs, biogeochemical cycles, and the sediment stabilization.
Keywords	altitude ; biofilm ; brooms ; cameras ; data collection ; flight ; hyperspectral imagery ; lighting ; littoral zone ; radiometry ; reflectance ; sediments ; spectrometers ; French Guiana
Language	English
Dates of publication	2021-1126
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article
ZDB-ID	2513863-7
ISSN	2072-4292
ISSN	2072-4292
DOI	10.3390/rs13234792
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Article: Mangrove microbiota along the urban-to-rural gradient of the Cayenne estuary (French Guiana, South America): Drivers and potential bioindicators

Fiard, Maud / Cuny, Philippe / Sylvi, Léa / Hubas, Cédric / Jézéquel, Ronan / Lamy, Dominique / Walcker, Romain / El Houssainy, Amonda / Heimbürger-Boavida, Lars-Eric / Robinet, Tony / Bihannic, Isabelle / Gilbert, Franck / Michaud, Emma / Dirberg, Guillaume / Militon, Cécile

Science of the total environment. 2022 Feb. 10, v. 807

2022

Abstract: The microbial communities inhabiting the Atlantic-East Pacific (AEP) mangroves have been poorly studied, and mostly comprise chronically polluted mangroves. In this study, we characterized changes in the structure and diversity of microbial communities ... ...

Abstract	The microbial communities inhabiting the Atlantic-East Pacific (AEP) mangroves have been poorly studied, and mostly comprise chronically polluted mangroves. In this study, we characterized changes in the structure and diversity of microbial communities of mangroves along the urban-to-rural gradient of the Cayenne estuary (French Guiana, South America) that experience low human impact. The microbial communities were assigned into 50 phyla. Proteobacteria, Chloroflexi, Acidobacteria, Bacteroidetes, and Planctomycetes were the most abundant taxa. The environmental determinants found to significantly correlated to the microbial communities at these mangroves were granulometry, dieldrin concentration, pH, and total carbon (TC) content. Furthermore, a precise analysis of the sediment highlights the existence of three types of anthropogenic pressure among the stations: (i) organic matter (OM) enrichment due to the proximity to the city and its wastewater treatment plant, (ii) dieldrin contamination, and (iii) naphthalene contamination. These forms of weak anthropogenic pressure seemed to impact the bacterial population size and microbial assemblages. A decrease in Bathyarchaeota, “Candidatus Nitrosopumilus”, and Nitrospira genera was observed in mangroves subjected to OM enrichment. Mangroves polluted with organic contaminants were enriched in Desulfobacteraceae, Desulfarculaceae, and Acanthopleuribacteraceae (with dieldrin or polychlorobiphenyl contamination), and Chitinophagaceae and Geobacteraceae (with naphthalene contamination). These findings provide insights into the main environmental factors shaping microbial communities of mangroves in the AEP that experience low human impact and allow for the identification of several potential microbial bioindicators of weak anthropogenic pressure.
Keywords	Acanthopleuribacteraceae ; Chitinophagaceae ; Chloroflexi ; Desulfarculaceae ; Desulfobacteraceae ; Geobacteraceae ; Planctomycetes ; anthropogenic activities ; carbon ; dieldrin ; estuaries ; microorganisms ; naphthalene ; organic matter ; pH ; population size ; sediments ; wastewater treatment ; French Guiana
Language	English
Dates of publication	2022-0210
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2021.150667
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Article ; Online: Climate change and diminishing seasonality in Arctic benthic processes.

Morata, Nathalie / Michaud, Emma / Poullaouec, Marie-Aude / Devesa, Jérémy / Le Goff, Manon / Corvaisier, Rudolph / Renaud, Paul E

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

2020 Volume 378, Issue 2181, Page(s) 20190369

Abstract: The iconic picture of Arctic marine ecosystems shows an intense pulse of biological productivity around the spring bloom that is sustained while fresh organic matter (OM) is available, after which ecosystem activity declines to basal levels in autumn and ...

Abstract	The iconic picture of Arctic marine ecosystems shows an intense pulse of biological productivity around the spring bloom that is sustained while fresh organic matter (OM) is available, after which ecosystem activity declines to basal levels in autumn and winter. We investigated seasonality in benthic biogeochemical cycling at three stations in a high Arctic fjord that has recently lost much of its seasonal ice-cover. Unlike observations from other Arctic locations, we find little seasonality in sediment community respiration and bioturbation rates, although different sediment reworking modes varied through the year. Nutrient fluxes did vary, suggesting that, although OM was processed at similar rates, seasonality in its quality led to spring/summer peaks in inorganic nitrogen and silicate fluxes. These patterns correspond to published information on seasonality in vertical flux at the stations. Largely ice-free Kongsfjorden has a considerable detrital pool in soft sediments which sustain benthic communities over the year. Sources of this include macroalgae and terrestrial runoff. Climate change leading to less ice cover, higher light availability and expanded benthic habitat may lead to more detrital carbon in the system, dampening the quantitative importance of seasonal pulses of phytodetritus to seafloor communities in some areas of the Arctic. This article is part of the theme issue 'The changing Arctic Ocean: consequences for biological communities, biogeochemical processes and ecosystem functioning'.
MeSH term(s)	Arctic Regions ; Climate Change ; Diffusion ; Ecosystem ; Geologic Sediments/chemistry ; Ice Cover/chemistry ; Norway ; Oceans and Seas ; Organic Chemicals/analysis ; Oxygen/analysis ; Seasons ; Seawater/chemistry ; Spatio-Temporal Analysis
Chemical Substances	Organic Chemicals ; Oxygen (S88TT14065)
Language	English
Publishing date	2020-08-31
Publishing country	England
Document type	Journal Article
ZDB-ID	208381-4
ISSN	1471-2962 ; 0080-4614 ; 0264-3820 ; 0264-3952 ; 1364-503X
ISSN (online)	1471-2962
ISSN	0080-4614 ; 0264-3820 ; 0264-3952 ; 1364-503X
DOI	10.1098/rsta.2019.0369
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