The Mineral Composition of Intracellular Inclusions in Nematodes From Thiobiotic Mangrove Mud-Flats

Nicholas, W. L.; Goodchild, D. J.; Stewart, Aaron

doi:10.1163/187529287x00308

Cited by 23 publications

(17 citation statements)

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“…Physiological and behavioral adaptations of the named species to poor-oxygenated environment include a low respiratory rate and slow movements (Warwick and Price, 1979;Warwick and Gee, 1984). Deposition of insoluble metal sulphides in intracellular inclusions in the species Sabatieria wieseri and Terschellingia longicaudata has been suggested as a mechanism of detoxification of sulfide (Nicholas et al, 1987). We observed granules in the intestine of specimens from Cienfuegos Bay, which would perform this detoxification function but further research is needed to clarify this.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 79%

Effects of organic enrichment on nematode assemblages in a microcosm experiment

Armenteros

Pérez-García

Ruiz-Abierno

et al. 2010

Marine Environmental Research

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Marine nematodes from subtidal tropical sediments of Cienfuegos Bay were subjected to organic enrichment in a microcosm experiment for 32 days. Nematode abundance and diversity decreased, and the taxonomic and trophic structure was altered. The results suggested that the nematodes were not food limited in the microcosms or in their natural environment. Chemical stressors such as ammonia and hydrogen sulfide derived from reduced conditions in sediments may be important factors affecting the assemblages. Hypoxic conditions occurred in all experimental units, as well as in the field, suggesting a nematode assemblage adapted to naturally enriched sediments. However, tolerant species showed a grade of sensitivity to reduced conditions. In agreement with the model by Pearson and Rosenberg (1978), we predict that further organic enrichment in sediments from Cienfuegos Bay may cause a phase shift into a strongly depleted benthic fauna and reduced conditions in water and sediments.

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 79%

Effects of organic enrichment on nematode assemblages in a microcosm experiment

Armenteros

Pérez-García

Ruiz-Abierno

et al. 2010

Marine Environmental Research

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“…-the presence of dark, often multilayered intracellular globules in the intestinal cells -are often pointed out as typical for sulfidic muds, but their significance is ambiguous and their adaptive value for the thiobiotic life disputed. Moreover, the deposition of insoluble metal sulfides in intracellular inclusions in Terschellingia longicaudata has been suggested to be a mechanism of detoxification of sulfide (Nicholas et al, 1987). Further, some specimens belonging to the OMZ showed some morphological differences, whereas others were observed to have epibionts, like the majority of specimens of Desmodora sp.…”

Section: Nematode Density and Community Structurementioning

confidence: 99%

Structure and function of nematode communities across the Indian western continental margin and its oxygen minimum zone

Singh

Ingole

2016

Biogeosciences

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Abstract. We studied patterns of nematode distribution along the western Indian continental margin to determine the influence of habitat heterogeneity and low oxygen levels on the community's taxonomic and functional structure. A single transect, perpendicular to the coast at 14 • N latitude was sampled from 34 to 2546 m depth for biological and environmental variables during August 2007. The oxygen minimum zone extended from 102 to 1001 m. Nematodes (described and undescribed) were identified to species and classified according to biological and functional traits. A total of 110 nematode species belonging to 24 families were found along the transect. Three depth zones were identified: the shelf (depth range: 34-102 m; highest nematode mean density: 176.6 ± 37 ind 10 cm −2 ), the slope (525-1524 m; 124.3 ± 16 ind 10 cm −2 ), and the basin (2001-2546 m; 62.9 ± 2 ind 10 cm −2 ). Across the entire study area, the dominant species were Terschellingia longicaudata, Desmodora sp. 1, Sphaerolaimus gracilis, and Theristus ensifer; their maximum density was at shelf stations. Nematode communities in different zones differed in species composition. Chromadorita sp. 2 (2.78 %) and Sphaerolaimus gracilis (2.21 %) were dominant on the shelf, whereas Terschellingia longicaudata (4.73 %) and Desmodora sp. 1 (4.42 %) were dominant on the slope, but in the basin, Halalaimus sp. 1(1.11 %) and Acantholaimus elegans (1.11 %) were dominant. The information in a particular functional group was not a simple reflection of the information in species abundance. Ecological information captured by adult length, adult shape, and life-history strategy was less sitespecific and thus differed notably from information contained in other taxonomic groups. The functional composition of nematodes was strongly linked to the organiccarbon and dissolved-oxygen concentration. Seven species were found exclusively in the oxygen minimum zone: Pselionema sp. 1, Choanolaimus sp. 2, Halichoanolaimus sp. 1, Cobbia dentata, Daptonema sp. 1, Trissonchulus sp. 1, and Minolaimus sp. 1. Correlation with a number of environmental variables indicated that food quantity (measured as the organic-carbon content and chlorophyll content) and oxygen level were the major factors that influenced nematode community structure and function.

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“…The physiological and behavioural adaptations of T. longicaudata to poorly oxygenated environments include a low respiratory rate and slow movement (Warwick andGee 1984, Guerrini et al 1998). The deposition of insoluble metal sulphides in intracellular inclusions in T. longicaudata has been suggested as a mechanism of detoxification of sulphide (Nicholas et al 1987). Leptolaimus is another genus that is frequently and widely distributed in TE systems (Heip et al 1985, Pallo et al 1998, Ferrero et al 2008).…”

Section: Effect Of Environmental Variables On Taxonomic Structure Andmentioning

confidence: 99%

The nematode assemblage of a coastal lagoon (Lake Varano, southern Italy): ecology and biodiversity patterns

Semprucci¹,

Balsamo²,

Frontalini³

2014

Sci. Mar.

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Summary:This study was conducted in Lake Varano (southern Italy) in order to determine the environmental parameters that influence nematode taxonomic and functional diversity and how they influence them, and to classify for the first time the ecological quality status of a transitional environment. The general composition and level of taxonomic diversity were comparable with those reported for transitional environments worldwide. Principal component analysis revealed that the main environmental factors controlling the assemblages in terms of both composition and biological traits were grain size, organic matter, pollution load index and, only secondarily, salinity. Molgolaimus allgeni, Terschellingia longicaudata and Leptolaimus luridus showed higher values in relation to silt, organic matter and pollution load index, while Axonolaimus caudostriatus, Odontophora wieseri, Paramonhystera pellucida and Paracanthonchus longicaudatus showed higher values in relation to the redox potential and sand percentage. Salinity was detected as an influencing parameter only secondarily and particularly for Calomicrolaimus honestus, Daptonema normandicum, Thalassomonhystera parva and Sabatieria pulchra. With respect to functional traits, the trophic groups seemed to be mainly related to sediment type, which is in turn reflected by the nature of the available food. The maturity index, as well as c-p classes, did not always permit a clear interpretation of the interaction between anthropogenic and natural factors. However, the greater influence of the San Antonino and San Francesco Canals was perfectly revealed by the nematode assemblage. In accordance with the current ecological quality classes, Lake Varano can mainly be classified as having good to poor ecological quality status.Keywords: free-living nematodes; biodiversity; transitional environment; ecological quality; Lake Varano.La comunidad de nematodos de una laguna costera (Laguna de Varano, Italia meridional): patrones de la ecología y la biodiversidad Resumen: Este estudio tiene como objetivo analizar cuál y en qué medida los parámetros ambientales influyen en la diversidad taxonómica y funcional de los nematodos y clasificar por primera vez el Estado de la Calidad Ecológica (EQS) de un ambiente de transición como la laguna de Varano (Italia meridional). La composición y el nivel de divesidad taxonómica son comparables con los reportados en todo el mundo para TEs. El análisis de componentes principales reveló que los factores que controlan la composición y las características biológicas de las comunidades son el tamaño del gránulo, la materia orgá-nica (MO), el índice de aportes contaminados (PLI) y sólo secundariamente la salinidad. Molgolaimus allgeni, Terschellingia longicaudata y Leptolaimus luridus aumentan en número en relación con el limo, la MO y el PLI, mientras Axonolaimus caudostriatus, Odontophora wieseri, Paramonhystera pelúcida y Paracanthonchus longicaudatus muestran valores más altos en relación con el potencial redox y el porcentaje de arena. La salinida...

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The Mineral Composition of Intracellular Inclusions in Nematodes From Thiobiotic Mangrove Mud-Flats

Cited by 23 publications

References 0 publications

Effects of organic enrichment on nematode assemblages in a microcosm experiment

Effects of organic enrichment on nematode assemblages in a microcosm experiment

Structure and function of nematode communities across the Indian western continental margin and its oxygen minimum zone

The nematode assemblage of a coastal lagoon (Lake Varano, southern Italy): ecology and biodiversity patterns

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