Micro‐Meiofaunal Community Structure and Nematode Diversity in a Lagoonal Ecosystem (Fangataufa, Eastern Tuamotu Archipelago)

Gourbault, N.; Renaud-Mornant, Jeanne

doi:10.1111/j.1439-0485.1990.tb00237.x

Cited by 14 publications

(7 citation statements)

References 11 publications

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“…The richness of the meiofauna was overall comparable to the data available on similar types of habitats and in tropical regions (Gourbault & Renaud-Mornant 1990; Guo et al ., 2008; Semprucci et al ., 2013). The lowest abundances recorded in the Huvadhoo lagoon could be explained by the well-known inverse trend between meiofaunal abundance and depth (Alongi & Pichon, 1988; de Bovée et al ., 1990; Tietjen, 1992; Vincx et al ., 1994; Sommer & Pfannkuche, 2000; Rex et al ., 2006).…”

Section: Discussionsupporting

confidence: 79%

Spatial patterns of distribution of meiofaunal and nematode assemblages in the Huvadhoo lagoon (Maldives, Indian Ocean)

et al. 2014

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Huvadhoo Atoll is a little-known and generally uncontaminated atoll of the southern Maldives, although the human pressure is increasing. This study represents the first attempt to characterize the meiofaunal and nematode assemblages of its lagoon both from a taxonomic and functional point of view. The nematode assemblage was made up of a total of 131 genera in 33 families. Desmodoridae, Chromadoridae and Xyalidae represented the richest and most abundant families, followed in terms of abundance by Selachinematidae and Comesomatidae. The nematode richness was overall higher than that reported in the previous studies carried out in the Central part of the archipelago. The diversity patterns revealed higher values than those reported for the back-reefs platforms, so confirming the positive influence of the water depth on the biodiversity of the nematode assemblage. The statistical analysis highlighted a significant taxonomic difference of the assemblages between the stations characterized by fine and medium-coarse sands, respectively, in line with the auto-ecological preferences of the taxa detected. The use of some nematode descriptors for assessing the ecological quality status (EQS) of the lagoon has revealed a slight disturbance in the station close to Viligili, one of the most urbanized islands. However, the summarization of all the descriptors used allows the highlighting of the good EQS of the Huvadhoo lagoon. Thus, the results of this study may be taken as the starting point for the future monitoring of the potential and real impact of the anthropogenic activity on the area over time.

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Section: Discussionsupporting

confidence: 79%

Spatial patterns of distribution of meiofaunal and nematode assemblages in the Huvadhoo lagoon (Maldives, Indian Ocean)

et al. 2014

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“…A great richness in nematode genera was also found, and the presence of a remarkable 96 of 123 genera set 'new records' for the archipelago. A notable overlap in generic composition can be observed between the Maldivian nematode assemblage found in this study and those reported for other tropical and even temperate areas (Heip et al 1985;Alongi 1986;Gourbault & Renaud-Mornant 1990;Gourbault et al 1995;Boucher 1997;Ndaro & Ó lafsson 1999;Raes et al 2007). The distribution of some genera across a broad range of different habitats, and even geographically distant areas, not only proves the wide distribution of these taxa, but also the existence of iso-communities that mainly associate with specific sediment grain sizes (Raes et al 2007).…”

Section: Discussionsupporting

confidence: 72%

“…A notable overlap in generic composition can be observed between the Maldivian nematode assemblage found in this study and those reported for other tropical and even temperate areas (Heip et al. 1985; Alongi 1986; Gourbault & Renaud‐Mornant 1990; Gourbault et al. 1995; Boucher 1997; Ndaro & Ólafsson 1999; Raes et al.…”

Section: Discussionsupporting

confidence: 71%

The distribution of meiofauna on back-reef sandy platforms in the Maldives (Indian Ocean)

et al. 2010

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The Maldivian archipelago comprises some of the most characteristic and significant world atoll systems, but the meiobenthic assemblages of these islands continue to be largely unknown. To investigate variations in meiofaunal spatial distribution and biodiversity in back‐reef platforms, three transects were studied, two at Felidhoo (the north and east sides) and one at South Malé. The sedimentological features of the samples obtained were also analyzed to further current knowledge on the relationships that exist between sediments and meiofauna. Our results reveal that the meiofaunal assemblage at these locations is well diversified and includes 20 major taxa. Nematodes and copepods are dominant, together forming 68% of the total meiofauna, followed by platyhelminthes, polychaetes and ostracods. The nematode assemblage is very rich and composed of 34 families and 123 genera – 96 of which (78%) set new records for the Maldives. The structures of the meiofaunal and nematode assemblages are relatively similar on the ‘large‐scale’ level (i.e. when the different platforms are compared) and reveal a low β‐diversity. However, significant dissimilarities were detected within each platform, emphasizing that such ‘small‐scale’ differences are the main factors determining the structure of the meiofauna and, in particular, the nematode assemblages. Although significant differences were not detected between the transects, greater levels of dissimilarity were recognized at North Felidhoo. Here, the building of inclined deposit layers plays a significant role in increasing the heterogeneity of the platform habitats and sediments, confirming the great importance of sediment granulometry as an environmental variable. Indeed, a close relationship is observed between meiofauna (especially for the nematodes) and grain size, which appears to control the structure, diversity and trophic composition of the Maldivian meiofauna assemblages, thus highlighting the high biodiversity existing in the medium‐coarse sands.

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“…Along the Brazilian coast, the diversity of Xyalidae and Chromadoridae richness is well-documented in the literature, with these families occurring in several environments (Venekey et al , 2010). Although Xyalidae has been previously reported as the most dominant family by Gourbault & Renaud-Mornant (1990) in calcareous shore and by Riera et al (2014) at volcanic sediments, Desmodoridae and Chromadoridae were dominant in most of the other oceanic islands studied, especially in those composed by carbonate sediments with medium-coarse sands (Boucher, 1997; Netto et al , 1999a, b, c).…”

Section: Discussionmentioning

confidence: 82%

“…Comparing the dominant families and genera of nematodes there seems to be a pattern in islands with carbonate sediments. In all islands, nematodes associations are dominated by families Desmodoridae, Oncholaimidae, Epsilonematidae and Chromadoridae; the only exception is Fangataufa Atoll (very fine to fine sand) where Xyalidae is the dominant family (Gourbault & Renaud-Mornant, 1990). However, in islands with volcanic sediments, dominance of nematode families changes drastically from locality to locality, thus reinforcing the role of endemic soils, in structuring nematode associations in volcanic sandy beaches.…”

Section: Discussionmentioning

confidence: 99%

Meiofauna and free-living nematodes in volcanic sands of a remote South Atlantic, oceanic island (Trindade, Brazil)

Santos

Venekey

2017

J. Mar. Biol. Ass.

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This study presents patterns of spatial and temporal variation in the meiofaunal community and nematode associations on the volcanic sandy beaches of Trindade Island, a remote oceanic island in the South-east Atlantic Ocean. Samples were collected in August (rainy season) and December 2014 (dry season) on four beaches (Tartarugas, Parcel, Cabritos and Portugueses) at three zones of the intertidal (high, mid and low). A total of 10 meiofaunal groups were found. Copepods (31%) and nematodes (27%) dominated the meiofauna in all beaches and zones, regardless of the season. Nematodes were comprised mainly of non-selective deposit feeders, with a total of 27 genera from 12 families, with Cyatholaimidae, Xyalidae and Oncholaimidae as the most diverse and abundant. Significant differences were found in the meiofaunal community, as well as in nematode associations, among seasons and intertidal zones but not among beaches. The sediment characteristics were the main drivers regulating the structure of meiobenthic fauna in Trindade Island. Our findings are also compared to other studies focusing on the meiofauna and nematodes of oceanic islands with carbonate and volcanic sediments; the major patterns are herein presented.

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Micro‐Meiofaunal Community Structure and Nematode Diversity in a Lagoonal Ecosystem (Fangataufa, Eastern Tuamotu Archipelago)

Cited by 14 publications

References 11 publications

Spatial patterns of distribution of meiofaunal and nematode assemblages in the Huvadhoo lagoon (Maldives, Indian Ocean)

Spatial patterns of distribution of meiofaunal and nematode assemblages in the Huvadhoo lagoon (Maldives, Indian Ocean)

The distribution of meiofauna on back-reef sandy platforms in the Maldives (Indian Ocean)

Meiofauna and free-living nematodes in volcanic sands of a remote South Atlantic, oceanic island (Trindade, Brazil)

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