Structure and functional characteristics of the meiofauna community in highly unstable intertidal mudbanks in Suriname and French Guiana (North Atlantic coast of South America)

Dupuy, Corinne; Hien, Nguyen Thanh; Mizrahi, David; Jourde, Jérôme; Bréret, Martine; Agogué, Hélène; Beaugeard, Laureen; Bocher, Pierrick

doi:10.1016/j.csr.2015.09.019

Cited by 12 publications

(5 citation statements)

References 52 publications

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“…Even in the environment with the highest density, meiofauna was less abundant in the present study compared to the standard value observed in other tropical estuaries (Ansari and Parulekar, 1993; Dupuy et al ., 2015; Baia and Venekey, 2019). These studies, however, were conducted in estuaries with a wide salinity variation, and therefore, differ from the patterns found in the present study, as the estuary here is characterized by the predominance of freshwater, especially in the period of the year when sampling was conducted.…”

Section: Discussionmentioning

confidence: 99%

Effect of sediment on meiofauna and Nematoda structure in different freshwater Amazon environments under the influence of mesotides

Lima dos Santos,

Baia,

Venekey

2023

J. Mar. Biol. Ass.

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The present study investigated the horizontal and vertical distribution of meiofauna community and Nematoda assemblages on two sandy beaches and two muddy tidal flats in a freshwater Amazon estuary governed by mesotides. Meiofauna density was significantly higher in muddy environments, explained by the higher food availability. On the one hand, there was no difference between sediment layers in both sandy environments, which suggests that individuals must have migrated to layers deeper than 10 cm. On the other, the highest densities and richness in muddy environments occurred in the upper layer due to higher food and oxygen availability in the surface sediment layer, which decreases with depth. Muddy environments differed on both beaches; they had the highest nematode genera densities and richness. This might be explained by the high nutrient enrichment in these environments. There was no significant difference in Nematoda density and richness between zones in any environment, likely due to the small mid-littoral extension (<40 m), which did not favour the high spatial variability of genera. Nematoda density was higher at a depth of 0–2 cm in both muddy environments, explained by the availability of oxygen and food. The high abundance of deposit-feeder genera in muddy environments indicates high organic enrichment, whereas the distribution of trophic types was more homogeneous on the beaches where abiotic factors tended to be more structuring than food availability.

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Section: Discussionmentioning

confidence: 99%

Effect of sediment on meiofauna and Nematoda structure in different freshwater Amazon environments under the influence of mesotides

Lima dos Santos,

Baia,

Venekey

2023

J. Mar. Biol. Ass.

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“…The overall meiofaunal richness observed in this study (i.e., 12 groups) is similar to other studies on the deep sea (e.g., Schmidt et al 2018; Sevastou et al 2020). At the Amazon basin, however, differently from coastal (Christine et al 2015; Venekey et al 2019; Baia et al 2021) and continental shelf (Aller and Aller 1986; Aller and Stupakoff 1996), the deep‐sea meiofauna is almost entirely represented by nematodes. At the other basins (e.g., Ceará), increasing carbonate and sand percentages lead to a more heterogeneous benthic system, which in turn can support a higher meiofaunal richness (e.g., positively correlated with carbonate, Fig.…”

Section: Discussionmentioning

confidence: 99%

Amazon River discharge impacts deep‐sea meiofauna

Pereira

Castellões²,

Netto

2022

Limnology & Oceanography

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In this study, we show that the deep‐sea meiofauna community at the Brazilian Equatorial Margin (BEM) is strongly influenced by the Amazon River. Our comparison across four deep ocean basins including Amazon, Pará‐Maranhão, Barreirinhas, and Ceará showed that the former supports a completely distinct meiofaunal community. Meiofaunal richness increased with increasing distance from the Amazon, reflecting changes in sediment proprieties among basins. Total phytopigment content at Amazon sediments was threefold higher than at other basins. The chlorophyll a/Phaeo mean ratio, however, was lower than 1, suggesting a predominant degraded bulk organic matter derived from the Amazon River discharge. Nematode assemblages from Amazon strongly differed from the other basins mostly due to higher genus richness, trophic diversity, and variations in the abundance of Sabatieria, which in turn led into higher dissimilarity values and turnover rate. Furthermore, the bathymetric distribution of nematode assemblages at Amazon and Ceará basins differed significantly among depth zones, especially due to the higher abundance and diversity at Amazon basin. Our findings show that the Amazon River plays a critical role in structuring and shaping the deep‐sea meiofauna and nematode biodiversity at the BEM. Increasing impacts on the Amazon rainforest will certainly affect the amount of freshwater discharge, and the quantity and quality of organic material transported to the Atlantic Ocean, which in turn will have effects on the deep‐sea communities.

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“…The density values estimated in this study were eight times above those reported by Soltwedel (2000) for tropical areas, which, according to Coull (1999), are in the order of 1,000 ind/10 cm 2 in soft marine sediments. This is evidenced when comparing the densities obtained in depths of the Venezuelan territorial sea, in which the density of meiobenthos was between 13-153 ind/10 cm 2 (Woods & Tietjen, 1985), the central zone of the Great Barrier Reef in Australia (26 m deep) with 220-1,010 ind/10 cm 2 (Hansen et al 1987), southeastern Costa Rica (5 m deep) with 99-575 ind/10 cm 2 (Guzmán et al 1987), Rocks Atoll in northeast Brazil (2.5 m deep) with 278-4,165 ind/10 cm 2 (Netto et al 2003), Bay Lagoon in Jamaica (<10 m deep) with 327.7-5,518.9 ind/10 cm 2 (Edwards, 2009), Cienfuegos Bay in Cuba (9 m deep) with 780.02 ± 772 ind/10 cm 2 (Armenteros et al 2009), intertidal zones in Suriname and French Guiana (<1 m deep) with 1,760-4,400 ind/10 cm 2 (Dupuy et al 2015), and tropical beaches in Brazil (<6 m deep) with 288-2,553 ind/10 cm 2 (Baia & Venekey, 2019). These differences could be the result of different depths, temperatures, and other environmental conditions.…”

Section: Discussionmentioning

confidence: 99%

“…In fact, those organisms that pass through a 500 µm mesh-size sieve and are retained on a 63 µm mesh, including permanent and temporary small metazoans and larger protozoans (ciliates, amoebozoans), are considered meiobenthos (Giere, 2009). The meiobenthos community resides in interstitial spaces of sediments and above other organisms in all aquatic habitats, from the intertidal to the deep ocean areas in all latitudes (Wołowicz et al 2011;Dupuy et al 2015). Marine meiobenthos include more than 30 taxonomic groups, of which nematodes, foraminifera, harpacticoid copepods, cumaceans, ostracods, platyhelminthes, annelids, and juvenile stages of other groups are the most abundant (Giere, 2009;Wołowicz et al 2011;Dupuy et al 2015;Warwick, 2018).…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal variations of the subtidal meiobenthic community of the central coast of Venezuela

et al. 2020

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Meiobenthos is a sediment-dwelling community with various taxonomic groups ranging in size from 63 to 500 µm. As a matter and energy link between primary producers and macrofauna, they have other functions in the ecosystem. Since this group has been scarcely studied in Venezuela, it was proposed to analyze the spatial and temporal variations in the composition and abundance of subtidal meiobenthos in the country's central coast. Samplings were conducted monthly from June 2014 to March 2015. In each sampling campaign, 12 random stations were established, and three samples were taken at each using a cylindrical sampler of 5.0 cm internal diameter. Organisms were identified and counted using microscopes, and data was processed using hypothesis tests (ANOSIM) and multivariate analyzes (SIMPER, nMDS). Meiobenthos showed a richness of 164 morphotypes and 14 phyla, with a dominance of planktonic copepods and foraminifers, followed by cnidarians and mollusks. Out of the total species reported, 84 are strictly benthic. Regarding abundance, there was a greater representation of foraminifera, followed by nematodes and mollusks, with values higher than those reported for tropical areas. Spatially, no differences were found in the composition and abundance of this community. However, two maximums were found throughout the study period, one starting in June until reaching maximum densities between August and October and the second one in February

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Structure and functional characteristics of the meiofauna community in highly unstable intertidal mudbanks in Suriname and French Guiana (North Atlantic coast of South America)

Cited by 12 publications

References 52 publications

Effect of sediment on meiofauna and Nematoda structure in different freshwater Amazon environments under the influence of mesotides

Effect of sediment on meiofauna and Nematoda structure in different freshwater Amazon environments under the influence of mesotides

Amazon River discharge impacts deep‐sea meiofauna

Spatial and temporal variations of the subtidal meiobenthic community of the central coast of Venezuela

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