Facteurs influen�ant la structure des groupements de macro-invert�br�s benthiques et phytophiles dans la zone littorale du Saint-Laurent (Qu�bec)

Vincent, B.; Lafontaine, N.; Caron, Pierre-Luc

doi:10.1007/bf00014959

Cited by 10 publications

(16 citation statements)

References 21 publications

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“…m -2 in the 0 -3 cm layer). This is in contrast with many findings in the literature, according to which the macro-invertebrate density is normally much higher in macrophyte stands than in the sediments (Gerking 1957;Pieczynski 1973;Soszka 1975;Vincent et al 1982;Rasmussen 1988). The community structure in the reference sites was dominated by ostracods, mussels (mainly Dreissena polymorpha), chironomid larvae and mayfly larvae which have been proved to be among the most frequent taxonomic groups in many other lentic lake shore habitats.…”

Section: Discussioncontrasting

confidence: 86%

Effects of mooring management on submerged vegetation, sediments and macro-invertebrates in Lake Constance, Germany

Ostendorp

Gretler²,

Mainberger³

et al. 2008

Wetlands Ecol Manage

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Mooring areas are a common form of berthing in many of Germany's inland waters for the growing number of sporting boats. A circular swinging zone around the anchor zone is formed, in which the submerged macrophyte vegetation is destroyed to a large extent, and the sediment surface is eroded. We investigated the effects of two types of buoy (conventional and so-called hook-buoys) in comparison with undisturbed reference sites nearby. The aim of the study was to identify possible harmful consequences of mooring sites to lake littoral habitats in Lake Constance-Untersee, and to provide information to managers to aid them in the formulation of mooring management plans with the least ecological impact. The study focused on submerged vegetation, surface sediments and macro-invertebrate colonisation. In the swinging circle of conventional buoys (87 m 2 ) we observed a significant sediment matter erosion of 0.9 tonnes and a reduction of organic matter amount by 4.5% of the undisturbed reference. The vegetation free area increased by 122%, and the phytomass (mainly Chara div. spp.) was reduced by 14.6% per berth. The psammophilous macro-invertebrate numbers were not significantly affected (-3%) in contrast to the phytophilous taxa which were reduced by 12.7% per berth. The mayfly larvae were the most negatively affected taxon. Oligochaetes profited from the clearing of the sediment surface in the swinging circles. The ecological effects of the hook-buoys were more minor, mainly due to the smaller swinging circle (6 m 2 ). We concluded that the detrimental effects of mooring can be significantly reduced by mooring systems, e. g. the hookbuoy system as it was used in this study, which reduce the area disturbed and cleared by the anchor chain. We argue that these results can be generalised to mooring areas with soft bottom and dense macrophyte vegetation in Lake Constance and other large lakes.

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Section: Discussioncontrasting

confidence: 86%

Effects of mooring management on submerged vegetation, sediments and macro-invertebrates in Lake Constance, Germany

Ostendorp

Gretler²,

Mainberger³

et al. 2008

Wetlands Ecol Manage

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“…Vicent et al (1982) observed that the fauna in the macrophytes presents a magnitude of two to three times the abundance of zoobenthos in the litoral zone.…”

Section: Introductionmentioning

confidence: 99%

The invertebrate colonization during decomposition of Eichhornia azurea kunth in a lateral lake in the mouth zone of Paranapanema River into Jurumirim Reservoir (São Paulo, Brazil)

Stripari

Henry

2002

Braz. J. Biol.

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The invertebrate colonization during decomposition of Eichhornia azurea was observed in a lateral lake in the mouth zone of Paranapanema River into Jurumirim Reservoir in two periods of the year. The litter bags method was used for measuring the decomposition rate as well as to evaluate the invertebrates colonization. Forty-two litter bags, measuring 15 × 20 cm in size and 2 mm mesh net, were incubated "in situ". Six litter bags (three for colonization and three for decomposition measurements) were removed after the 1 st , 3 rd , 7 th , 14 th , 28 th , 56 th and 72 nd days of incubation. After each day, the material was carefully cleaned for detritus removal and invertebrate sampling. The biological material was fixed with 4% formaline and then sorted and identified. The remaining plant material was dried in an oven (at 60 o C) and weighed. A fast material loss occurred during the first 24 hours and the decomposition rate was higher during the rainy season than in the dry season. A peak on invertebrate density (110 ind.g.DW -1 ) on the remaining detritus of Eichhornia azurea was recorded in the 56 th day of dry season, when the polyphenol concentration of plant detritus was 0.57 UDO.g.DW -1 . In the rainy season, higher density was found in the 28 th day of incubation, when the polyphenol concentration was 4.36 UDO.g.DW -1 . Apparently, the reduction in the polyphenol concentration was followed by an increase in invertebrate densities. The majority of the species observed in the detritus belongs to the collector group that was dominant after the 7 th and 14 th days in the rainy and dry seasons, respectively.Key words: decomposition, colonization, invertebrate, Eichhornia azurea, lake. RESUMO Decomposição de Eichhornia azurea e colonização por invertebradosA colonização por invertebrados durante o processo de decomposição de Eichhornia azurea foi examinada em duas épocas do ano na zona de desembocadura do Rio Paranapanema,

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“…This technique, was adopted after comparison with that used by Mackie & Quadri (1971) and by Vincent et al (1982) . It is well adapted to a single sampling of the epiphytic gastropods, to the muddy sediment, the size of the macrophytes and the shallow depth .…”

Section: Sampling Designmentioning

confidence: 99%

“…Lawrence River, the littoral zone covers large surfaces and is colonized in summer by numerous macrophytes that support a very abundant and diverse fauna dominated by gastropods (Vincent et al, 1982). Lawrence River, the littoral zone covers large surfaces and is colonized in summer by numerous macrophytes that support a very abundant and diverse fauna dominated by gastropods (Vincent et al, 1982).…”

Section: Introductionmentioning

confidence: 99%

Factors affecting the structure of epiphytic gastropod communities in the St. Lawrence River (Quebec, Canada)

1991

Self Cite

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A study of epiphytic gastropods associated with two submerged macrophytes (Myriophyllum spicatum and Vallisneria americana) was conducted at a soft and at a hard water site in the St . Lawrence River during two non-consecutive years in order to compare effects of macrophyte species and biomass, site and year in gastropod community structure . There was no effect of macrophyte species on total gastropod abundance nor on gastropod diversity, and few gastropod species showed a marked preference for either macrophyte species . Inter-site and inter-annual variations in diversity, total gastropod abundance and gastropod community structure were greater than variations among macrophytes . However, analysis of variations of epiphytic gastropod communities in one of the two sites shows that abiotic factors are important in explaining epiphytic gastropod distribution . Our results and results of other studies on gastropod population dynamics in the St . Lawrence River indicate that intra-and interspecific competition between gastropods is important on macrophytes and that they must be carefully considered in order to understand epiphytic community structure and population dynamics .

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Facteurs influen�ant la structure des groupements de macro-invert�br�s benthiques et phytophiles dans la zone littorale du Saint-Laurent (Qu�bec)

Cited by 10 publications

References 21 publications

Effects of mooring management on submerged vegetation, sediments and macro-invertebrates in Lake Constance, Germany

Effects of mooring management on submerged vegetation, sediments and macro-invertebrates in Lake Constance, Germany

The invertebrate colonization during decomposition of Eichhornia azurea kunth in a lateral lake in the mouth zone of Paranapanema River into Jurumirim Reservoir (São Paulo, Brazil)

Factors affecting the structure of epiphytic gastropod communities in the St. Lawrence River (Quebec, Canada)

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