Some recommendations for an accurate estimation of Lanice conchilega density based on tube counts

Hoey, Gert Van; Vincx, Magda; Degraer, S.

doi:10.1007/s10152-006-0041-8

Cited by 21 publications

(9 citation statements)

References 14 publications

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“…Three replicate cores were taken from three different areas of the patches: (i) an area with an average density of L . conchilega individuals (based on counts of fringed tubes, [ 55 ]) of 25–27 tubes per core surface (3185–3440 ind. m -2 ) (hereafter referred to “high L .…”

Section: Methodsmentioning

confidence: 99%

The effect of bio-irrigation by the polychaete Lanice conchilega on active denitrifiers: Distribution, diversity and composition of nosZ gene

et al. 2018

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The presence of large densities of the piston-pumping polychaete Lanice conchilega can have important consequences for the functioning of marine sediments. It is considered both an allogenic and an autogenic ecosystem engineer, affecting spatial and temporal biogeochemical gradients (oxygen concentrations, oxygen penetration depth and nutrient concentrations) and physical properties (grain size) of marine sediments, which could affect functional properties of sediment-inhabiting microbial communities. Here we investigated whether density-dependent effects of L. conchilega affected horizontal (m-scale) and vertical (cm-scale) patterns in the distribution, diversity and composition of the typical nosZ gene in the active denitrifying organisms. This gene plays a major role in N2O reduction in coastal ecosystems as the last step completing the denitrification pathway. We showed that both vertical and horizontal composition and richness of nosZ gene were indeed significantly affected when large densities of the bio-irrigator were present. This could be directly related to allogenic ecosystem engineering effects on the environment, reflected in increased oxygen penetration depth and oxygen concentrations in the upper cm of the sediment in high densities of L. conchilega. A higher diversity (Shannon diversity and inverse Simpson) of nosZ observed in patches with high L. conchilega densities (3,185–3,440 ind. m-2) at deeper sediment layers could suggest a downward transport of NO3− to deeper layers resulting from bio-irrigation as well. Hence, our results show the effect of L. conchilega bio-irrigation activity on denitrifying organisms in L. conchilega reefs.

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Section: Methodsmentioning

confidence: 99%

The effect of bio-irrigation by the polychaete Lanice conchilega on active denitrifiers: Distribution, diversity and composition of nosZ gene

et al. 2018

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“…The Chl a concentration (µg.g -1 dry sediment) of the upper sediment layer was determined using HPLC (Gilson) analysis (as described above) and used as a proxy for the microphytobenthos (MPB) biomass (Jeffrey et al 1997). L. conchilega densities were estimated by counting the tube tops with fringes on photographs of ten randomly placed metal frames (0.25 m 2 ) (Ropert and Dauvin 2000;Van Hoey et al 2006). Finally, per sampling area, ten macrobenthos samples were collected with an inox corer (Ø 12 cm, 40 cm deep), sieved through a 1-mm circular mesh size and fixed with a neutralized 8% formalin solution.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

“…A prime example is the aggregations composed of the Sandmason Lanice conchilega (Polychaeta, Terebellidae). This species may achieve densities of several thousands of individuals m −2 ( Van Hoey et al, 2006) and as such generate elevated sediment reefs ( Rabaut et al, 2009). L. conchilega displays both autogenic (e.g.…”

Section: Introductionmentioning

confidence: 99%

Biogenic reefs affect multiple components of intertidal soft-bottom benthic assemblages: the Lanice conchilega case study

Smet

D'Hondt

Verhelst

et al. 2015

Estuarine, Coastal and Shelf Science

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International audienceBiogenic reefs composed of the tube-building polychaete Lanice conchilega are important from a conservationpoint of view because they noticeably increase the biodiversity in otherwise species poorenvironments. However, up to now, little or no attention has been paid to the intertidal epi- andhyperbenthic communities associated with the reefs. Therefore, this is the first study which focuses onthe effect of L. conchilega reefs on the entire bentho-pelagic community at two different locations.Environmental variables were measured and macro-, epi- and hyperbenthic communities were sampledwithin a L. conchilega reef and a control area at two locations in France: the bay of the Mont Saint-Michel(BMSM) and Boulogne-sur-Mer (Boulogne). The effect of the reef presence on the benthic communitywas studied with a 3-factor (Reef, Location and Period) Permanova. In addition, the relationship betweenthe benthic community and the environmental variables was investigated using Distance-based linearmodels (DistLM). Most collected organisms were sampled in the reef area (macrobenthos: 91%, epibenthos:81% and hyperbenthos: 78.5%) indicating that, independent of the location, the L. conchilegareefs positively affect all three associated benthic communities. However, the extent of the effect seemsto be most pronounced for the macrobenthos and less distinct in case of the hyperbenthos. The macro-,and epibenthos are mainly structured by biotic variables (L. conchilega density and macrobenthic foodavailability respectively), while the hyperbenthos is rather structured by environmental variables. Ingeneral, L. conchilega reefs do not only affect abundances and diversity but they substantially steer thestructure of the intertidal benthic sandy beach ecosystem

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“…In the lab, sample contents were rinsed and all macrofauna was sorted out and identified at species level. The density of L. conchilega is generally based on tube counts, where only tubes with fringes are counted (as suggested by Van Hoey et al, 2006). Because the experimental fishing might have damaged the fringes of the tubes, individual counts have been used in this study to avoid an underestimation of L. conchilega densities.…”

Section: Sample Processingmentioning

confidence: 99%

Experimental beam-trawling in Lanice conchilega reefs: Impact on the associated fauna

et al. 2008

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To study fisheries impact at the species level in temperate sandy bottom areas, a controlled field manipulation experiment was designed focusing on areas with high densities of the habitat-structuring, tube-dwelling polychaete Lanice conchilega (i.e. L. conchilega reefs). The hypothesis was that the impact on L. conchilega would be minimal, but that the fauna benefiting from the biogenically structured habitat would be impacted by beam-trawling. In this study, the impact of beam-trawl passage on intertidal L. conchilega reefs and its associated fauna was quantified. A treatment zone was exposed to a one-off experimental trawling. Subsequently, the impact on and recovery of the associated fauna was investigated for a period of 9 days post-impact. Community analysis showed a clear impact followed by a relatively quick recovery as apparent through MDS analysis (stress 0.06), a significant (p < 0.001) IMS of 0.61, through ANOSIM analysis: significant (p = 0.001) dissimilarities between treatment and control and through SIMPER analysis (decreasing dissimilarities over time). This impact and subsequent recovery was largely explained by two species: Eumida sanguinea and Urothoe poseidonis. Species analysis confirmed the beam-trawl passage significantly (p = 0.001) impacted E. sanguinea for the whole period of the experiment. The experiment confirmed that closely associated species of L. conchilega reefs are impacted by beam-trawl fisheries. This small-scale intertidal study provides some pointers which indicate that the tightly associated species will be impacted significantly when beam-trawling L. conchilega reefs in subtidal areas.

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Some recommendations for an accurate estimation of Lanice conchilega density based on tube counts

Cited by 21 publications

References 14 publications

The effect of bio-irrigation by the polychaete Lanice conchilega on active denitrifiers: Distribution, diversity and composition of nosZ gene

The effect of bio-irrigation by the polychaete Lanice conchilega on active denitrifiers: Distribution, diversity and composition of nosZ gene

Biogenic reefs affect multiple components of intertidal soft-bottom benthic assemblages: the Lanice conchilega case study

Experimental beam-trawling in Lanice conchilega reefs: Impact on the associated fauna

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