Beiträge zur ernährungsbiologie einheimischer süsswasserprosobranchier

Schäfer, Heinrich

doi:10.1007/bf00496988

Cited by 13 publications

(4 citation statements)

References 7 publications

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“…Hence, hydraulic stress from passing vessels probably results in high detachment rates several times a day. On the basis of these assumptions, more than 15% of B. tentaculata individuals, a species typically occurring on stones (Schäfer, 1953), would have been detached from stones six times a day during September. For L. hyalinus , occurring mainly on macrophytes and stones (Hendrich, 2003), more than 98% of the individuals would have been detached six times a day.…”

Section: Discussionmentioning

confidence: 99%

Effects of ship‐induced waves on littoral benthic invertebrates

2012

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Summary 1. Ship‐induced waves can affect the physical characteristics of lake and river shorelines, and laboratory studies have shown effects on littoral invertebrates. Here, we explored whether these effects could be observed under field conditions along a natural lake shore affected by wave sequences (trains) produced by boats. 2. Individuals of five invertebrate species (Bithynia tentaculata, Calopteryx splendens, Dikerogammarus villosus, Gammarus roeselii, Laccophilus hyalinus) were exposed to waves with increasing shear stress in five habitats differing in structural complexity. 3. Detachment of invertebrates increased with increasing shear stress and was best modelled using sigmoid response curves. Habitat structural complexity mitigated the effects of shear stress, and detachment rate was influenced more by habitat type than by species. A threshold (90% of the individual invertebrates unaffected) stress level of 0.64 N m−2 was found for a structurally complex reed habitat, compared to 0.37 N m−2 for a simple sand habitat. 4. Shear stress associated with wave trains created by recreational boating at a distance of 35 m from the shore and at a speed of 11 km h−1 resulted in 45% detachment of littoral invertebrates. Decreasing the boat‐to‐shore distance to 20 m increased wave shear stress by 30% and invertebrate detachments up to 75%. 5. Disturbance of littoral habitats and invertebrate assemblages are widespread in inland waters used for recreational and/or commercial navigation. Our findings show that the integrity of littoral zones of navigable surface waters could be much improved by implementing management measures such as physically protecting complex habitats with dense reed belts and tree roots, and reducing boat speeds and increasing their minimum shoreline distance.

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Section: Discussionmentioning

confidence: 99%

Effects of ship‐induced waves on littoral benthic invertebrates

2012

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“…Thus the assumed filtration values were close to the so called effective values (ECR, according to YU & CULVER 1999). Clearance rate in V. viviparus may reach 140 ml per hour for large specimens (SCHAFER 1953, HÖCKELMANN & PUSCH 2000. As shown by HÖCKELMANN & PUSCH (2000) in their studies on V. viviparus from the Spree River, in summer, at suspension concentration of 7 to 15 mg dm -3 , at least large specimens can balance their energy expenditure through filter-feeding.…”

Section: Filtration Activity Of Molluscs In Thementioning

confidence: 93%

“…Strong mixing causing increased resuspension has a limiting effect on filtration (ALDRIDGE et al 1987, WIOENIEWSKI 1990, MADON et al 1998). SCHAFER's (1953) studies indicate that the prosobranch V. viviparus filters at a flow speed of 3 m s -1 . The favourable effect of slight water flow consists in mixing, due to which food resources are replenished in the thin layer of water (a few cm) above the bottom which is available to bivalves and filtrationist snails.…”

Section: Selected Aspects Of Mollusc Effect On the Functioning Of Thementioning

confidence: 99%

“…The proportion of filter feeding in the total consumption by the snails in the Zegrzyñski Reservoir is not known, but calculations based on filtration rate data (HÖCKELMANN & PUSCH 2000) and the mean concentration of suspension in the reservoir indicate that filter-feeding could completely meet the energy requirements (reported by many authors). SCHAFER (1953) found that Bithynia tentaculata could completely satisfy its energy requirements through filtration when suspension content is ca. 20 mg dm -3 .…”

Section: Filtration Activity Of Molluscs In Thementioning

confidence: 99%

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Malacocoenoses of large lowland dam reservoirs of The Vistula River basin and selected aspects of their function

Jurkiewicz-Karnkowska¹

2004

Folia Malac.

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Spatio-temporal variation in qualitative and quantitative occurrence of malacofauna was analysed in three large lowland dam reservoirs. Differences between the malacofauna of flooded land areas and former river beds persist even in middle-aged reservoirs. Quick turnover of water has a positive effect on mollusc abundance and species richness of the whole reservoir, and on the frequency of occurrence in the former river bed. Considerable dynamics of the malacocoenoses and a possibility to revert to earlier development stages, as a result of considerable disturbance, were observed at an advanced stage of biocoenosis development. Besides water dynamics and composition and distribution of bottom deposits, a significant effect on the malacocoenoses is exerted by dominant species, especially D. polymorpha. Abundance and dominance structure of malacocoenoses determine their role in the ecosystem, including accumulation of phosphorus and heavy metals, and their cycling as a result of filtration activity, faeces production, excretion and trophic transfer. Generally, the quantities of elements, especially heavy metals, accumulated in molluscs, are much smaller than the quantities which flow through the malacocoenoses. A large part of the pool of these elements contained in the shells is excluded from circulation for many years. Food chains seem to have relatively little effect on the transfer of heavy metals in the reservoir.

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The Contribution of Gastropod Biomass in Macrobenthic Communities of a Karstic River

Habdija

Lajtner

Belinić

1995

Intl Review of Hydrobiology

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This study evaluated the standing crop biomass of freshwater snails and its spatial distribution according to four substrate types (boulders, cobbles, gravel covered with periphyton and gravel covered with macrophytes). The study site, in the Kupa River of the NW Dinarid area of Croatia, is in a karstic region. Depending on habitat, the gastropod wet biomass varied from 6.4 % to 43.8 % of the total macroinvertebrate biomass per unit area. The gastropods are the dominant component of biomass on boulder substrates in the upper region of the river, and on gravel substrates covered with macrophytes, in the lower course. It was found that gastropods are also the dominant component of the functional group of scrapers. The average annual gastropod biomass constitutes more than 80 % of scrapers at sampling sites in the upper and lower regions of the river.

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Beiträge zur ernährungsbiologie einheimischer süsswasserprosobranchier

Cited by 13 publications

References 7 publications

Effects of ship‐induced waves on littoral benthic invertebrates

Effects of ship‐induced waves on littoral benthic invertebrates

Malacocoenoses of large lowland dam reservoirs of The Vistula River basin and selected aspects of their function

The Contribution of Gastropod Biomass in Macrobenthic Communities of a Karstic River

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