Meiofaunal assemblages associated with scallop beds (<i>Adamussium colbecki</i>) in the coastal sediments of Terra Nova Bay (Ross Sea, Antarctica)

Danovaro, Roberto; Pusceddu, Antonio; Mirto, Simone; Fabiano, M.

doi:10.1017/s0954102099000528

Cited by 13 publications

(9 citation statements)

References 5 publications

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“…This was not the case in May 1998. The change in composition might be due to: 1) the occurrence in May 1998 of a late phase phytoplankton bloom, when highest flux rates of carbohydrate-enriched material usually occur (Danovaro et al, 1999), and/or 2) higher input of terrestrial plant-derived matter during this period. In May 1997 the contribution of fresh phytoplankton and hence of sedimentary nitrogen-rich proteins (Müller, 1977) and lipids was apparently more important.…”

Section: Elemental and Biochemical Composition Of Organic Mattermentioning

confidence: 99%

Meiofauna and sedimentary organic matter off Central Chile: response to changes caused by the 1997–1998 El Niño

et al. 2001

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Quantitative surveys of metazoan meiofauna were carried out in an upwelling region off Central Chile (36ºS). During May 1997 and May 1998, coinciding with the onset and end of El Niño, five benthic stations (respectively 27, 34, 64, 88, and 120 m depth), from the middle of Concepción Bay to the edge of the adjacent continental shelf, were sampled. The sedimentary organic matter biopolymeric fraction (proteins, carbohydrates and lipids) and chloroplastic pigments were also assessed. Total meiofauna abundance and biomass increased significantly between sampling dates at the mid-bay and inner shelf sites, from 1474 ± 354 to 5035 ± 291 individuals 10 cm-2 and from 2618 ± 332 to 5241 ± 903 individuals 10 cm-2 , respectively. The relative importance of copepods in the top 2 cm increased at all sites (except in the bay mouth). During May 1998, meiofauna, especially nematodes, penetrated deeper in the bay, as well as in the inner and middle shelf sediments. Changes observed in meiobenthos structure among sites and periods were attributed to the higher oxygenation of bottom waters during the summer of 1998 (i.e. El Niño conditions). This was most evident at sites such as the mid bay, where during non-El Niño years, oxygen-deficient conditions prevail. A decrease of organic matter quantity and quality, related to low primary productivity conditions in 1998 (El Niño), apparently caused few changes in meiofauna structure. A positive correlation between Thioploca and the meiofauna biomass was observed in May 1997, whereas in May 1998 no relationship was found. © 2001 Ifremer/CNRS/IRD/Éditions scientifiques et médicales Elsevier SAS Résumé − Méiofaune et matière organique du sédiment sur les côtes du Chili central : réponses aux changements causés par « El Niño », 1997-1998. Des mesures quantitatives de la méiofaune ont été réalisées dans une région côtière du Chili central (36°S). Pendant les périodes de mai 1997 et de mai 1998, qui coïncident avec l'apparition et la disparition d'El Niño, cinq stations (27, 34, 64, 88, 120 m de profondeur), comprises entre le milieu de la baie de Concepción et le bord du plateau continental, ont été examinées. La fraction de matières organiques sédimentaires (protéines, hydrates de carbone et lipides) ainsi que les pigments chloroplastiques ont été déterminés. L'abondance de la méiofaune et sa biomasse augmentent significativement : dans le milieu de la baie, de 1474 ± 354 à 5035 ± 291 individus pour 10 cm-2 , dans les sites intérieurs du plateau, de 2618 ± 332 à 5241 ± 903 individus pour 10 cm-2. L'importance relative des copépodes dans les 2 cm supérieurs augmente dans presque tous les sites, à l'exception de l'entrée de la baie. En mai 1998, la méiofaune, en particulier les nématodes, pénètre plus profondément dans les sédiments de la baie que dans ceux de l'intérieur et du centre du plateau. Les changements de la structure du méiobenthos, sont attribués à la haute oxygénation de l'été 1998 (El Niño). Ceci est plus évident dans les sites où, pendant les années sans El Niño, des conditions...

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Section: Elemental and Biochemical Composition Of Organic Mattermentioning

confidence: 99%

Meiofauna and sedimentary organic matter off Central Chile: response to changes caused by the 1997–1998 El Niño

et al. 2001

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“…Knowledge of Antarctic meiobenthic communities (here limited to metazoans, excluding foraminifera) is limited to only a few areas and shallow water (< 100 m) ecological studies are limited to the Antarctic Peninsula region, including Signy Island (Vanhove et al, 1998(Vanhove et al, , 2000, King George Island (Skowronski and Corbisier, 2002;Petti et al, 2006;Pasotti et al, 2012Pasotti et al, , 2014, and Adelaide Island (Fonseca et al, 2017); and the Ross Sea (Danovaro et al, 1999;Fabiano and Danovaro, 1999). There have also been some studies of deeper water Antarctic meiobenthos: in the Weddell Sea, Ross Sea, Bransfield Strait and Drake Passage (Vanhove et al, 1995(Vanhove et al, , 1999Lee et al, 2001a;Veit-Köhler et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Diversity, Abundance, Spatial Variation, and Human Impacts in Marine Meiobenthic Nematode and Copepod Communities at Casey Station, East Antarctica

et al. 2020

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The composition, spatial structure, diversity and abundance of Antarctic nematode and copepod meiobenthic communities was examined in shallow (5-25 m) marine coastal sediments at Casey Station, East Antarctica. The sampling design incorporated spatial scales ranging from 10 meters to kilometers and included testing for human impacts by comparing polluted (metal and hydrocarbon contaminated sediments adjacent to old waste disposal sites) and control areas. A total of 38 nematode genera and 20 copepod families were recorded with nematodes being dominant, comprising up to 95% of the total abundance. Variation was greatest at the largest scale (km's) but each location had distinct assemblages. At smaller scales there were different patterns of variation for nematodes and copepods. There were significant differences between communities at control and impacted locations. Community patterns had strong correlations with concentrations of metals introduced by human activity in sediments as well as sediment grain size and total organic content. Given the strong association with environmental patterns, particularly those associated with human impacts, we provide further evidence that meiofauna are very useful indicators of anthropogenic environmental changes in Antarctica.

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“…This behaviour can resuspend seston that may supplement their nutrition (Chiantore et al 1998). Similarly, meiofaunal densities are lower within populations of scallops in Terra Nova Bay, suggesting clap-induced suspension of meiofauna (Danovaro et al 1999). Valve claps could also be related to respiration, gamete release, or the clearance of faeces and pseudofaeces.…”

Section: Introductionmentioning

confidence: 99%

Video observations on non-swimming valve claps in the Antarctic scallop Adamussium colbecki

2010

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Meiofaunal assemblages associated with scallop beds (Adamussium colbecki) in the coastal sediments of Terra Nova Bay (Ross Sea, Antarctica)

Cited by 13 publications

References 5 publications

Meiofauna and sedimentary organic matter off Central Chile: response to changes caused by the 1997–1998 El Niño

Meiofauna and sedimentary organic matter off Central Chile: response to changes caused by the 1997–1998 El Niño

Diversity, Abundance, Spatial Variation, and Human Impacts in Marine Meiobenthic Nematode and Copepod Communities at Casey Station, East Antarctica

Video observations on non-swimming valve claps in the Antarctic scallop Adamussium colbecki

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