Spatial distribution of bivalves in relation to environmental conditions (middle Danube catchment, Hungary)

Bódis, Erika; Nosek, J; Oertel, Nándor; Tóth, Bence; Hornung, Elisabeth; Sousa, Ronaldo

doi:10.1556/comec.12.2011.2.9

Cited by 24 publications

(30 citation statements)

References 43 publications

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“…Therefore, the association between pulmonate species, S. corneum and macrophytes in the Wkra River catchment area may be explained by their feeding mode and the filtration process. This result is consistent with the survey done by BódIs et al (2011) who, based on a CCA analysis, showed a positive correlation between the distribution of S. corneum or other fingernail clams and the macrophyte occurrence.…”

Section: Mollusc Communities In Relation Tosupporting

confidence: 92%

“…The mean density of the depressed river mussel was lower than 0.4 indiv. m -2 in the middle Danube catchment area in Hungary (BódIs et al 2011). The range of P. complanata extends across most European countries: Finland, Sweden, Russia, Germany, Austria, Switzerland, France, the Netherlands and the United Kingdom.…”

Section: Rare Threatened and Alien Species In The Mollusc Communitiementioning

confidence: 98%

“…Thirty three mollusc species (18 gastropod species and 15 bivalve species including 5 alien species) were recorded during a six-year survey of the 396.6 km long Serbian stretch of the Danube, whereas only 26 mollusc species were obtained during a one-year survey of the same stretch of the Danube River (MartInovIcVItanovIc et al 2013, TuBić et al 2013. In comparison, 22 bivalve species including five alien species occurred in the Hungarian stretch of the Danube River and its tributaries (samples were collected four times a year) (BódIs et al 2011). However, 85 mollusc species were found in the entire course of the Danube River (martInovIc-VItanovIc et al 2013).…”

Section: Structure Of Mollusc Communities and Values Of Indices In mentioning

confidence: 99%

“…Thus, the clear relationship between the distribution of these prosobranch species and dissolved oxygen may be explained by their physiological make up. The concentration of dissolved oxygen (besides substratum particle size) was the parameter that also affected the distribution of some unionid species most, including U. pictorum and U. crassus in the Danube River and its tributaries (BódIs et al 2011).…”

Section: Unio Crassus Philipsson 1788 As a Species Of The European Cmentioning

confidence: 99%

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Mollusc communities of lowland rivers and oxbow lakes in agricultural areas with anthropogenically elevated nutrient concentration

Lewin¹

2014

Folia Malacol.

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Anthropogenically elevated nutrient concentration occurs in both ground and surface waters and cause grave environmental problems which are responsible for the degradation of water quality on a worldwide scale. The progressive anthropogenic pressure caused by prolonged agricultural activity has a negative effect on most water ecosystems including rivers and reservoirs. Freshwater molluscs, which are hololimnic organisms, have a limited mobility; therefore, they are good bioindicators of changes in their habitats. They reflect the abiotic or biotic state of water habitats, which represents the impact of environmental change on the habitat, community as well as on the ecosystem. A long-term survey of mollusc communities revealed the occurrence of 44 species including some rare, vulnerable, threatened or legally protected species, e.g. Borysthenia naticina, Unio crassus, Anodonta cygnea, Pseudanodonta complanata or Sphaerium rivicola, in the Wkra River, its tributaries and selected oxbow lakes. In the Wkra River catchment area, the mollusc communities, including U. crassus (Habitats Directive Natura 2000), are under a combined effect of several environmental factors. Conductivity, hardness, current velocity, river width, temperature, nutrient concentration and the size of sediment particles were the parameters most associated (statistically significant according to the forward selection results) with the distribution of mollusc species. The forward selection results showed that the concentration of dissolved oxygen and the occurrence of macrophytes also exerted a significant influence on the distribution of Mollusca. Among environmental factors, anthropogenically elevated concentrations of nitrites and nitrates in the water were the most predictive parameters that negatively influenced (stressors) the structure of mollusc communities. The novel findings of this survey showed that some mollusc species could tolerate wider ranges of some environmental factors and higher concentrations of nutrients than had been expected. U. crassus is more tolerant of a relatively high concentration of nitrates in the water than was previously expected, as well as of nitrites and phosphates, and it can survive in rivers with relatively high nutrient concentration. The present results confirm both the field and the toxicological research on the negative effect of nitrites and nitrates, which is caused by their toxicity to freshwater molluscs. The number of individuals, number of mollusc species and density decreased dramatically within the last year of the survey in the Wkra River and its tributaries. This phenomenon seems to be a direct result of the nutrient enrichment in the Wkra River catchment area, the regulation of riverbeds or an indirect result, e.g. lack of primary or appropriate host fishes for unionid species. The declining trend in the global mollusc population has probably begun to occur in the Wkra River catchment area.

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Section: Mollusc Communities In Relation Tosupporting

confidence: 92%

Section: Rare Threatened and Alien Species In The Mollusc Communitiementioning

confidence: 98%

Section: Structure Of Mollusc Communities and Values Of Indices In mentioning

confidence: 99%

Section: Unio Crassus Philipsson 1788 As a Species Of The European Cmentioning

confidence: 99%

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Mollusc communities of lowland rivers and oxbow lakes in agricultural areas with anthropogenically elevated nutrient concentration

Lewin¹

2014

Folia Malacol.

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“…However, "suspension feeders" presented their highest number of individuals in the outermost part of the lagoon where hydrodynamics ranged from moderate to high. It has previously been shown that the dominance of this trophic group is determined by hydrodynamics (Sanz 1986, Pearson and Rosenberg 1987, Bódis et al 2011) and the sediment grain size (Sanders 1958, Young and Rhoads 1971, Jaramillo 1984, Probert 1984. Concerning "carnivores", they reached their maximal proportion at the outer part of Papapouli Lagoon (ST3) as well as in station ST1, especially in winter and spring where the sea-inlet was open.…”

Section: Discussionmentioning

confidence: 98%

Spatio-temporal variability of benthic macrofauna in a coastal lagoon assessed by ecological interaction networks

Paraskevopoulou¹,

Monokrousos²,

Kappas³

et al. 2015

Community Ecology

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An ecological survey of the benthic communities was carried out, at both spatial and temporal scales, in Papapouli Lagoon, the first ecotouristic park in Greece by applying for the first time, ecological network analysis. The application of ecological network analysis provided novel information on the quality of interactions among species, undetected by the most frequently used methods. The sorting of substrate samples enabled the identification and density determination of 40,036 individuals belonging to 31 different taxa, although, strong dominance of only a few species was observed. "Deposit feeders" were the dominant trophic group in all sampling sites and seasons while "suspension feeders" exhibited relatively the lowest abundance. The periodic opening of the sea inlet seems to be of crucial importance. In coastal lagoons, where there is constant communication with the sea, benthic fauna patterns seem to change according to the sea-land gradient. However, in intermittently closed lagoons, such as Papapouli Lagoon, a more homogenous pattern is evident. The obtained networks showed that when communication with the sea is interrupted all the benthic fauna patterns tend to be destabilized and centralized around one species, which in most cases is a "deposit feeder". When the inlet opens and communication with the sea is restored, the benthic composition seems to be more cohesive, especially in the most distant regions. Knowledge generated by network analysis should provide a valuable tool in order to assess potential environmental changes and assist management decisions.

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Freshwater mollusc assemblages and habitat associations in the Danube River drainage, Hungary

Bódis

Tóth

Sousa

2015

Aquatic Conservation

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ABSTRACT1. Native freshwater mollusc diversity has been declining over the past decades. For developing efficient conservation management plans for molluscs, it is especially important to identify areas with high native biodiversity.2. The River Danube is one of the most important freshwater ecosystems in Europe and should receive special attention. The main objective of this work was to characterize the composition, diversity and conservation status of freshwater molluscs occurring in the Hungarian Danube River Drainage in five river habitat types (main channel of the Rivers Danube and Tisza, side channels of River Danube, tributaries of Rivers Danube and Tisza).3. In total, 53 mollusc species were identified including 10 invasive species and 12 species of conservation concern. The main determining factors of mollusc composition were sediment characteristics, current velocity and oxygen content. Nitrate-nitrogen, ammonium-nitrogen, and calcium content also play a key role.4. Overall, density, species richness and diversity showed significant differences between habitat types. The highest diversity values were detected in the side channels, but the highest proportion of threatened species was observed in the tributaries. The highest number and proportion of invasive species was detected in the main channel of the Danube. Most of the recorded invasive species were previously documented in side channels and the adjacent wetlands, but did not invade the tributaries.5. Tributaries may provide refuges for native molluscs and could be considered as 'source' populations, which may be critically important in the regional maintenance of threatened species. Tributaries are still less disturbed and less invaded; and should be given priority in future conservation management plans.

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Spatial distribution of bivalves in relation to environmental conditions (middle Danube catchment, Hungary)

Cited by 24 publications

References 43 publications

Mollusc communities of lowland rivers and oxbow lakes in agricultural areas with anthropogenically elevated nutrient concentration

Mollusc communities of lowland rivers and oxbow lakes in agricultural areas with anthropogenically elevated nutrient concentration

Spatio-temporal variability of benthic macrofauna in a coastal lagoon assessed by ecological interaction networks

Freshwater mollusc assemblages and habitat associations in the Danube River drainage, Hungary

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