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  • 1
    Online Resource
    Online Resource
    A new method for three-dimensional visualization and quantification of biogenic structures in aquatic sediments using axial tomodensitometry : CT scan of biogenic structures
    Wiley ; 2005
    In:  Limnology and Oceanography: Methods Vol. 3, No. 8 ( 2005-08), p. 372-380
    Details
    In: Limnology and Oceanography: Methods, Wiley, Vol. 3, No. 8 ( 2005-08), p. 372-380
    Type of Medium: Online Resource
    ISSN: 1541-5856
    URL: Article
    DOI: 10.4319/lom.2005.3.372
    Language: English
    Publisher: Wiley
    Publication Date: 2005
    detail.hit.zdb_id: 2161715-6
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  • 2
    Online Resource
    Online Resource
    Spatial distribution of Alitta virens burrows in intertidal sediments studied by axial tomodensitometry
    Cambridge University Press (CUP) ; 2013
    In:  Journal of the Marine Biological Association of the United Kingdom Vol. 93, No. 6 ( 2013-09), p. 1543-1552
    Details
    In: Journal of the Marine Biological Association of the United Kingdom, Cambridge University Press (CUP), Vol. 93, No. 6 ( 2013-09), p. 1543-1552
    Abstract: Relationships between sediment characteristics and the spatial organization of biogenic structures remain poorly understood, albeit important for characterizing bioturbation impacts and small-scale ecological patterns. Using axial tomodensitometry (CT-scan) and core sectioning, we studied the spatial distribution of Alitta virens burrows in sediment cores from two mudflats with different degrees of exposure along the St Lawrence Estuary, Canada. A variety of burrow morphologies was observed at both sites, with most being I-shaped. Most values measured (organic matter content, mean tomographic intensity, the number and diameter of burrow shafts and the percentage of space they occupy per transverse section) covaried with depth. The more sheltered site had higher organic matter and mud contents, and lower average tomographic intensity values. The spatial distribution of burrow shafts also differed between sites, with the more sheltered site having a higher number of burrow shafts and percentage of biogenic space in the upper sediment column, as well as a greater volume of biogenic structures that were connected to the surface (although intra-site variability was great). Along the horizontal plane and at various depths within sediments, burrow shafts were more randomly distributed at the exposed site, compared to a more even, maximal spacing at the sheltered site. In addition to finding differences in burrow organization at two spatial scales, we found significant correlations between tomographic intensity and (1) the number of burrow shafts, (2) biogenic space and (3) organic matter content. CT-scan data, including tomographic intensity, are useful for examining and comparing biogenic structures in sediment cores.
    Type of Medium: Online Resource
    ISSN: 0025-3154 , 1469-7769
    URL: Article
    DOI: 10.1017/S0025315413000519
    RVK:
    WA 15000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2013
    detail.hit.zdb_id: 1491269-7
    detail.hit.zdb_id: 281325-7
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    Influence of suspended scallop cages and mussel lines on pelagic and benthic biogeochemical fluxes in Havre-aux-Maisons Lagoon, Îles-de-la-Madeleine (Quebec, Canada)
    Canadian Science Publishing ; 2007
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 64, No. 11 ( 2007-11-01), p. 1491-1505
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 64, No. 11 ( 2007-11-01), p. 1491-1505
    Abstract: An in situ experiment was done in July 2004 to test and compare the influence of suspended bivalve cultures (1- and 2-year-old blue mussels (Mytilus edulis) and sea scallops (Placopecten magellanicus)) on biogeochemical fluxes in the water column and at the benthic interface in Havre-aux-Maisons Lagoon (Quebec, Canada). Aquaculture structures increased the pelagic macrofaunal biomass (PMB) and acted as an oxygen sink and nutrient source in the water column under dark conditions. Although PMB was lower in scallop culture, the influence of scallop cages on pelagic fluxes was similar to or greater (nitrate and nitrite) than that of mussel lines. Sediments were organically enriched, and benthic macrofaunal abundances were decreased in mussel culture zones relative to the control zone, but such an effect was not observed in the scallop zone. Nevertheless, benthic oxygen demand did not vary among culture types and control zones. Benthic nutrient fluxes were greatest beneath aquaculture structures. Both pelagic and benthic interfaces may modify oxygen and nutrient pools in culture zones in Havre-aux-Maisons Lagoon. The contribution of aquaculture structures to oxygen, ammonium, and phosphate pools may be a function of PMB and type. While aquaculture structures had an important role on nitrate and nitrite cycling, silicate turnover was mainly driven by benthic mineralization of biodeposits.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f07-116
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 7966-2
    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
    SSG: 12
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  • 4
    Online Resource
    Online Resource
    Influence of suspended mussel lines on the biogeochemical fluxes in adjacent water in the Îles-de-la-Madeleine (Quebec, Canada)
    Canadian Science Publishing ; 2006
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 63, No. 6 ( 2006-06-01), p. 1198-1213
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 63, No. 6 ( 2006-06-01), p. 1198-1213
    Abstract: Oxygen consumption and nutrient fluxes were measured in 80 L enclosures containing water, 1- or 2-year-old mussels, or 1- or 2-year-old line sections (mussels plus associated fauna organic matter complex: AFOM) in August and September 2003 in the Îles-de-la-Madeleine. Mussel lines acted as nutrient sources and oxygen sinks in adjacent water. The magnitude of fluxes at the mussel line interface depended on the nutrient (NH 4 〉 〉 Si(OH) 4 , PO 4 〉 NO 3 〉 NO 2 ). Mussel metabolism contributed greatly to O 2 consumption and NH 4 and PO 4 releases. Mussel influence was greater in stressful periods. The AFOM complex mainly contributed to NO 3 , NO 2 , and Si(OH) 4 fluxes. These fluxes could originate from organic matter decomposition rather than from associated faunal metabolism. The influence of AFOM depended on its composition and thus on line immersion time. Mussel lines by ammonia releases could be a factor of reduction of N limitation in the water column. Mussel line should be integrated as a new interface of biogeochemical exchanges in environmental carrying capacity studies.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f06-030
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 7966-2
    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
    SSG: 12
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  • 5
    Online Resource
    Online Resource
    Responses of benthic macrofauna and biogeochemical fluxes to various levels of mussel biodeposition: An in situ “benthocosm” experiment
    Elsevier BV ; 2009
    In:  Marine Pollution Bulletin Vol. 58, No. 10 ( 2009-10), p. 1544-1553
    Details
    In: Marine Pollution Bulletin, Elsevier BV, Vol. 58, No. 10 ( 2009-10), p. 1544-1553
    Type of Medium: Online Resource
    ISSN: 0025-326X
    URL: Article
    DOI: 10.1016/j.marpolbul.2009.05.010
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2009
    detail.hit.zdb_id: 414337-1
    detail.hit.zdb_id: 2001296-2
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  • 6
    Online Resource
    Online Resource
    Influence of Suspended Mussel Aquaculture and an Associated Invasive Ascidian on Benthic Macroinvertebrate Communities
    MDPI AG ; 2022
    In:  Water Vol. 14, No. 17 ( 2022-09-03), p. 2751-
    Details
    In: Water, MDPI AG, Vol. 14, No. 17 ( 2022-09-03), p. 2751-
    Abstract: Many benthic macroinvertebrates are associated with cultured bivalves but are normally excluded from studies on the environmental effects of bivalve aquacultures. We evaluated the hypothesis that mussel aquaculture increases overall “benthic” macroinvertebrate productivity by considering both sediment- and mussel sock-associated macroinvertebrates. It was predicted that the presence of the invasive ascidian Styela clava would increase this effect by increasing the mussel sock’s biogenic structure. Macroinvertebrates in sediments and on mussel socks were sampled in eight bays on Prince Edward Island, Canada: three were invaded by Styela clava and there were five where it was absent. Infaunal macroinvertebrates associated with benthic sediments (sediment macroinvertebrates) within leases were less abundant relative to the control locations outside of leases and showed a trend towards decreased biomass and productivity. Abundance of mussel sock-associated macroinvertebrates was greater in bays with S. clava than in bays without it. When sediment and mussel sock macroinvertebrates were considered together as “benthic” communities within mussel leases and compared to sediment macroinvertebrate communities outside of leases, “benthic” macroinvertebrate abundance, biomass, and productivity were greater inside mussel leases than in areas outside of them. The presence of S. clava did not influence this trend. Although the ecological role of the macroinvertebrates associated with suspended mussels is likely not equivalent to those associated with benthic sediments, the presence of macroinvertebrates on suspended mussels, in some measure, offsets the impacts on the abundance, biomass, and productivity of macroinvertebrate communities at the farm-scale.
    Type of Medium: Online Resource
    ISSN: 2073-4441
    URL: Article
    DOI: 10.3390/w14172751
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2521238-2
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