Vertical distribution of meiofauna in sediments from contrasting sites in the adriatic sea: Clues to the role of abiotic versus biotic control

Moodley, Leon; Chen, Guotong; Heip, C.H.R.; Vincx, Magda

doi:10.1080/00785326.2000.10409450

Cited by 45 publications

(26 citation statements)

References 33 publications

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“…Length and diameter variation probably have different ecological costs and benefits for nematodes. For example, longer nematodes are likely more mobile than shorter nematodes, perhaps with the ability to make forays below the shallow oxic zone in muddy sediment (Moodley et al, 2000). Shorter nematodes may be limited to a more narrow depth range above the redox zone (Soetaert et al, 2002).…”

Section: Body Size Variation With Sediment Depthmentioning

confidence: 99%

The response of nematodes to deep-sea CO2 sequestration: A quantile regression approach

Fleeger

Johnson

Carman

et al. 2010

Deep Sea Research Part I: Oceanographic Research Papers

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Section: Body Size Variation With Sediment Depthmentioning

confidence: 99%

The response of nematodes to deep-sea CO2 sequestration: A quantile regression approach

Fleeger

Johnson

Carman

et al. 2010

Deep Sea Research Part I: Oceanographic Research Papers

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“…copepods) are the least tolerant (see review by Wetzel et al, 2001). The generally high tolerance of nematodes to low oxygen concentrations (see also Moodley et al, 2000) often results in an increase in their relative abundance. One of the mechanisms to escape from temporal anoxia is to migrate from hypoxic sediments into the water column and to settle again to the sediment with the return of normoxic conditions (Wetzel et al, 2001).…”

Section: In Situ Experimentsmentioning

confidence: 99%

Structural and functional responses of harpacticoid copepods to anoxia in the Northern Adriatic: an experimental approach

et al. 2013

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Combined in situ and laboratory studies were conducted to document the effects of anoxia on the structure and functioning of meiobenthic communities, with special focus on harpacticoid copepods. In a first step, anoxia was created artificially by means of an underwater chamber at 24 m depth in the Northern Adriatic, Gulf of Trieste (Mediterranean). Nematodes were found as the most abundant taxon, followed by harpacticoid copepods. While nematode densities were not affected by treatment (anoxia/normoxia) or sediment depth, these factors had a significant impact on copepod abundances. Harpacticoid copepod family diversity, in contrast, was not affected by anoxic conditions, only by depth. Ectinosomatidae and Cletodidae were most abundant in both normoxic and anoxic samples.

The functional response of harpacticoid copepods to anoxia was studied in a laboratory tracer experiment by adding ¹³C pre-labelled diatoms to sediment cores in order to test (1) if there is a difference in food uptake by copepods under normoxic and anoxic conditions and (2) whether initial (normoxia) feeding of harpacticoid copepods on diatoms results in a better survival of copepods in subsequent anoxic conditions. Independent of the addition of diatoms, there was a higher survival rate in normoxia than anoxia. The supply of additional food did not result in a higher survival rate of copepods in anoxia, which might be explained by the presence of a nutritionally better food source and/or a lack of starvation before adding the diatoms. However, there was a reduced grazing pressure by copepods on diatoms in anoxic conditions. This resulted in a modified fatty acid composition of the sediment. We concluded that anoxia not only impacts the survival of consumers (direct effect) but also of primary producers (indirect effect), with important implications for the recovery phase

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“…Highly active fauna, especially crustaceans who are usually highly sensitive to hypoxia will be impacted first (Tietjen, 1969). Since harpacticoid copepods are the most sensitive taxon to decreased oxygen (Moodley et al, 2000), they are typically limited to the top layer of the detritus package. Nematodes conversely are more tolerant to low oxygen levels (Murrell and Fleeger, 1989;Wetzel et al, 2001).…”

Section: Environmental Factorsmentioning

confidence: 99%

Seasonal variability of meiofauna, especially harpacticoid copepods, in Posidonia oceanica macrophytodetritus accumulations

Mascart

Lepoint

Deschoemaeker

et al. 2015

Journal of Sea Research

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The overall aim of this study was (1) to assess the diversity and density of meiofauna taxa, especially harpacticoid copepod species, present within accumulated seagrass macrophytodetritus on unvegetated sand patches and (2) to elucidate the community structure of detritus-associated harpacticoid copepods in relation to natural temporal variability of physico-chemical characteristics of accumulations. This was investigated in a Posidonia oceanica (L.) Delile seagrass ecosystem in the northwest Mediterranean Sea (Bay of Calvi, Corsica, 42°35′N, 8°43′E) using a triplicate macrophytodetritus core field sampling in two contrasting sites over the four seasons of 2011. Meiofauna higher taxa consisted of 50% Copepoda, of which 87% belonged to the Harpacticoida order. Nematoda was the second most abundant taxa. The copepod community displayed a wide variety of morphologically similar and ecologically different species (i.e. mesopsammic, phytal, phytal-swimmers, planktonic and parasitic). The harpacticoid copepod community followed a strong seasonal pattern with highest abundances and species diversity in May-August, revealing a link with the leaf litter epiphyte primary production cycle. Aside from the important role in sheltering, housing and feeding potential of macrophytodetritus, a harpacticoid community BEST analysis demonstrated a positive correlation with habitat complexity and a negative correlation with water movements and P. oceanica leaf litter accumulation.

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Vertical distribution of meiofauna in sediments from contrasting sites in the adriatic sea: Clues to the role of abiotic versus biotic control

Cited by 45 publications

References 33 publications

The response of nematodes to deep-sea CO2 sequestration: A quantile regression approach

The response of nematodes to deep-sea CO2 sequestration: A quantile regression approach

Structural and functional responses of harpacticoid copepods to anoxia in the Northern Adriatic: an experimental approach

Seasonal variability of meiofauna, especially harpacticoid copepods, in Posidonia oceanica macrophytodetritus accumulations

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