Horizontal zonation patterns and feeding structure of marine nematode assemblages on a macrotidal, ultra-dissipative sandy beach (De Panne, Belgium)

Gheskiere, Tom; Hoste, E.; Vanaverbeke, Jan; Vincx, Magda; Degraer, S.

doi:10.1016/j.seares.2004.02.001

Cited by 80 publications

(59 citation statements)

References 38 publications

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“…Analysed results of the trophic structure of free-living nematode communities in this study were also found in the same line with the study of Gheskiere, et al (2004) [23], in a tourists impacted sandy beach of the De Panne, Belgium. The authors reported that non-selective deposit feeders dominated all of the zones, except in the drift line, where epistratum feeders were dominant on sandy beaches.…”

Section: Discussionsupporting

confidence: 88%

Trophic structure of free-living nematodes in the Saigon River, Vietnam

Yen¹,

Ngo²

2017

VJSTE

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Abstract:Sub-tidal free-living nematodes in 12 stations along the Saigon River were investigated in both dry and rainy seasons during 2014 and 2015. In total, 157 nematode genera were found to belong to 59 families, and 11 orders of two classes of Enoplea and Chromadorea were identified. The trophic structure of free-living nematode communities was analysed spanning the overall seasons to see that deposit-feeders developed dominantly in the Saigon River indicating their association with food types including particles, bacteria, diatom, etc.. The dominance of deposit-feeders was contributed to a high abundance of genera in each station, including Theristus, Teschellingia, Monhystera, Thalassomonhystera, Paraplectonema, Daptonema, Aphanonchus, Sphaerotheristus, and Geomonhystera. Epistrate-feeder types were found as the second most abundant group. The remaining feeding types, such as chewers and suction-feeders, were in rather low proportion at most stations.

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Section: Discussionsupporting

confidence: 88%

Trophic structure of free-living nematodes in the Saigon River, Vietnam

Yen¹,

Ngo²

2017

VJSTE

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“…6A). Most nematodes are nonselective deposit-feeders (Gheskiere et al 2004) using labile organic matter (Moens et al 2002). Our results suggest that phytodetritus or MPB was not readily assimilated and that nematodes might depend on microbenthic organisms that rely on MPB or phytodetritus.…”

mentioning

confidence: 78%

Importance of phytodetritus and microphytobenthos for heterotrophs in a shallow subtidal sandy sediment

Evrard¹,

Huettel²,

Cook³

et al. 2012

Mar. Ecol. Prog. Ser.

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The relative importance of allochthonous phytodetritus deposition and autochthonous microphytobenthos (MPB) production for benthic consumers in an organic carbon (C org )-poor sandy sediment was assessed using a 13 C-stable isotope natural abundance study combined with a dual 13 C-tracer addition approach. In a first experiment (Expt 1), a set of sediment cores received a pulse of 13 C-labelled phytodetritus and the fate of that organic matter was followed in the benthic food web (bacteria, meiofauna and macrofauna) over a period of 72 h. In a second experiment (Expt 2), the MPB present in a set of sediment cores was labelled with 13 C-bicarbonate and the fate of labelled MPB was followed the same way over a period of 96 h. Natural 13 C abundances of sources and consumers revealed that the benthic food web likely relied primarily on MPB. In particular, diatoms contributed at least 40% to the diet of 12 out of the 16 taxonomic groups identified. The dual approach revealed the complexity of the trophic interactions and gave evidence for resource partitioning between 2 species of harpacticoid copepods. Both 13 C-tracer addition experiments showed a fast transfer of label to most heterotrophs. Bacteria, which comprised the largest fraction of the heterotroph biomass, incorporated more 13 C than other consumers. Meiofauna had similar relative incorporations in both experiments and likely relied equally on benthic and pelagic inputs. Macrofauna relied significantly more on MPB. In both experiments, most of the 13 C-label that was incorporated by heterotrophs was respired. While phytodetritus-derived C org consumed by heterotrophs was 41 mg C m −2 , MPB-derived was at least one order of magnitude higher. The benthic community growth efficiency in Expt 2 (40%) was higher than that of Expt 1 (25%), confirming the pivotal role of MPB.KEY WORDS: Stable isotopes · 13 C · Food web · Benthic microalgae · Phytoplankton · Meiofauna · Macrofauna · Bacteria Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 455: [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] 2012 ments (i.e. heterotrophic bacteria, microfauna, meiofauna and macrofauna) undergo frequent reworking due to physical forces. However, recent studies have provided strong evidence of high primary production (Billerbeck et al. 2007, Cook et al. 2007, Evrard et al. 2008) and enhanced remineralization rates supported by advective porewater transport (Huettel & Gust 1992a, Rusch et al. 2001, Ehrenhauss et al. 2004.The relative importance of the heterotrophic compartments has been assessed and some generic distribution patterns related to grain size have been illustrated. Firstly, the biomass of macrofauna (which generally comprises the metazoans larger than 1 mm) shows a decreasing trend towards coarser sediments ). This has been attributed to the greater influence of hydrodynamics on coarser grains as well as the patchiness of resources. Secondly, there is a coupled decrease in densities...

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“…The dominance of Xyalidae and the low number of nematode species also reflect the sediment grain size of Fazenda beach. A high abundance of Xyalidae in sandy beaches composed of fine-grained sediments was already evidenced by Gheskiere et al (2004), Hourston et al (2005) and Gourbault and Warwick (1994). In addition, fine sediment has a low diversity of nematodes and is generally inhabited by non-selective deposit feeders , which includes members of Xyalidae.…”

Section: Colonisation Patternmentioning

confidence: 98%

Is nematode colonisation in the presence of Scolelepis in tropical sandy-beach sediment similar to the colonisation process in temperate sandy beaches?

et al. 2013

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The role of a dominant macrobenthic polychaete, Scolelepis squamata, in the colonisation of defaunated tropical sediments by sandy-beach nematodes was investigated and compared with a previous colonisation experiment carried out on a temperate sandy beach. Experimental cylinders, equipped with lateral windows allowing infaunal colonisation, were filled with defaunated sediment containing two treatments, with and without S. squamata. These cylinders were inserted into microcosms containing sediment with indigenous meiofauna collected from the field. The treatments were incubated in the laboratory at ambient temperature and salinity for 7, 14 and 21 days. The nematode assemblages in both treatments did not differ in composition between treatments and from the natural assemblages, suggesting that all the species were equally able to colonise the experimental cores. The presence of the polychaete did not affect the development of the nematode community composition, in contrast to the results from a previous temperate-beach experiment. However, our results did not indicate whether the difference in results was caused by the different behaviour of the polychaete specimens, or by the different composition and response of the present nematode community.Keywords: meiofauna, Scolelepis squamata, Fazenda Beach, microcosm experiment, biological interactions.A colonização dos sedimentos de praias tropicais por nematódeos na presença de Scolelepis é similar ao processo de colonização que ocorre em praias arenosas temperadas? ResumoEsse estudo avaliou a influência da espécie Scolelepis squamata (Polychaeta) no processo de colonização de sedimentos defaunados obtidos em uma praia arenosa tropical, além de comparar esses resultados com um estudo similar realizado em uma praia temperada. Sedimentos, previamente defaunados, foram colocados em amostradores com aberturas laterais, que permitiram a colonização da meiofauna. Foram definidos dois tratamentos, um com a presença e outro com a ausência da espécie S. squamata, além do controle. Os amostradores desses tratamentos foram alocados em unidades experimentais do tipo microcosmo, as quais continham sedimento com a meiofauna residente. Os tratamentos foram incubados em laboratório por 7, 14 e 21 dias, com condições controladas de temperatura e salinidade. Os nematódeos não apresentaram diferenças significativas em termos de composição entre os tratamentos e nem em relação ao controle, sugerindo que todas as espécies desse grupo foram, igualmente, capazes de colonizar as unidades experimentais. Esses resultados indicaram que a presença do poliqueto não afetou a estrutura da comunidade de nematódeos, o que representou um resultado contrário ao obtido para a praia temperada. No entanto, não se pode concluir se essas diferenças entre as praias estariam relacionadas ao comportamento diferencial de S. squamata ou pela presença de comunidades de nematódeos distintas nas praias.Palavras-chave: meiofauna, Scolelepis squamata, Praia da Fazenda, experimento de microcosmo, interações b...

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Horizontal zonation patterns and feeding structure of marine nematode assemblages on a macrotidal, ultra-dissipative sandy beach (De Panne, Belgium)

Cited by 80 publications

References 38 publications

Trophic structure of free-living nematodes in the Saigon River, Vietnam

Trophic structure of free-living nematodes in the Saigon River, Vietnam

Importance of phytodetritus and microphytobenthos for heterotrophs in a shallow subtidal sandy sediment

Is nematode colonisation in the presence of Scolelepis in tropical sandy-beach sediment similar to the colonisation process in temperate sandy beaches?

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