Spatial and temporal variation in biomass and size structure of Corbicula fluminea in Danube River catchment, Hungary

Biologia ◽  
2012 ◽  
Vol 67 (4) ◽  
Author(s):  
Erika Bódis ◽  
Csaba Sipkay ◽  
Bence Tóth ◽  
Nándor Oertel ◽  
János Nosek ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Chlorophyll A ◽  
Shell Length ◽  
Size Structure ◽  
Corbicula Fluminea ◽  
Dry Mass ◽  
Danube River ◽  
Spatial And Temporal Variation ◽  
River Catchment ◽  
The Danube River

AbstractThe aim of this study was to reveal the spatial and temporal variation in biomass, density, and size structure of the invasive clam, Corbicula fluminea in the Danube River catchment and to explore the environmental factors determining these patterns. Samples were taken seasonally during the years 2007 and 2008 at 15 sites located along a river continuum from a second order stream to the Danube River. C. fluminea was the most abundant species in the main arm of the Danube; however, it was found in great density in the side arms, too. In the Ipoly River it only occured close to the conjuction, and it was not present at all in the second and third order streams. Regression models were developed to predict dry mass (DW, g) from linear body dimension [shell length (L), mm]. For the description of length-dry mass relationship, the power function (DW = a * Lb) was applied. The highest density, biomass, and mean shell length were 178 ind. m−2, 24.9697 g DW m−2, and 21.99 mm, respectively. ANOVA detected significant spatial variation in biomass; however, significant temporal variation was not recorded between the years, only among the seasons. Multiple linear regressions were used to find the relationship between the biomass and the environmental parameters. The coarse and very fine sediment fractions and the high water temperature provided suitable habitat for C. fluminea. Although statistically significant correlation was not detected between the chlorophyll-a content of water and the biomass, the highest biomass values were recorded at sites with high chlorophyll-a value.

Temporal variation of biomarkers in common bream Abramis brama (L., 1758) exposed to untreated municipal wastewater in the Danube River in Belgrade, Serbia

2021 ◽  
Vol 193 (8) ◽  
Author(s):  
Jovana Kostić-Vuković ◽  
Stoimir Kolarević ◽  
Margareta Kračun-Kolarević ◽  
Željka Višnjić-Jeftić ◽  
Božidar Rašković ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Municipal Wastewater ◽  
Danube River ◽  
Abramis Brama ◽  
The Danube River ◽  
Bream Abramis Brama ◽  
Common Bream ◽  
Common Bream Abramis Brama

scholarly journals Temporal variation of water discharges in the lower course of the Danube River across the area from Reni to Izmail under the influence of natural and anthropogenic factors

Energetika ◽  
2019 ◽  
Vol 65 (2-3) ◽  
Author(s):  
Yelyzaveta Romanova ◽  
Zhannetta Shakirzanova ◽  
Valeriya Ovcharuk ◽  
Olena Todorova ◽  
Iuliia Medvedieva ◽  
...  
Keyword(s):  
Temporal Variation ◽  
River Runoff ◽  
Water Exchange ◽  
Water Discharge ◽  
Hydrological Regime ◽  
Danube River ◽  
Anthropogenic Factors ◽  
The Danube River ◽  
Runoff Regime ◽  
Natural And Anthropogenic Factors

The Danube River mouth is a main source for fresh water used for water supply and irrigation purposes in the arid southern part of Ukraine. In addition, the water of the mouth is used for filling the Danube Lakes. Climate change and numerous social and economic factors reduce the area and the water level of the Danube Lakes and increase their salinity. Under these circumstances the water exchange between the Danube River and the lakes is a very important process which allows maintenance of the water–salt balance of the latter. Such water exchange massively depends on the Danube River regime. The paper presents research of temporal variation of typical water discharges in the lower course of the Danube River associated with assessment of natural and anthropogenic factors affecting river runoff fluctuations. Time series of annual average water discharge at the water gauging stations of such cities as Reni and Izmail were considered uniform for the selected periods. They cover the period of conventionally natural river runoff regime (1840–1920), the period of the least altered river runoff regime (1921–1960) and the most altered river runoff regime under a heavy anthropogenic influence (1961–1989). The analysis of the impact of climate changes on the river runoff allowed introduction of a new, modern period of the Danube River hydrological regime (1990–2015). It is established that the series of maximum and minimum water discharges are characterized by the lack of their uniformity from the beginning of the period of initial influence of hydraulic engineering structures on the hydrological regime (since 1961). The analysis of the aggregate multi-year series (1840–2015) of average annual, maximum and minimum water discharges of the Danube River across its length from Reni to Izmail showed the presence of positive trends. At the same time the period of climatic changes (after 1989) is characterized by a less intensive growth of maximum water discharges. The research resulted in establishing the periodicity and synchronism of water discharge fluctuations in the lower course of the Danube River from Reni to Izmail within the territory of Ukraine. In particular, the study showed for the first time that from the 2000s onwards the redistribution of river runoff between the Danube River branches led to unsynchronization of minimum river runoff in different parts of the Danube Delta. The research shows that comprehensive analysis of the Danube River hydrological regime under modern climatic conditions is required to ensure efficient engineering regulation of the Danube Lakes filling pattern. Such regulation, in its turn, will ensure that the water supply and irrigation purposes are achieved.

Living with an engineer: fish metacommunities in dynamic patchy environments

2018 ◽  
Vol 69 (6) ◽  
pp. 883 ◽  
Author(s):  
Aneta Bylak ◽  
Krzysztof Kukuła
Keyword(s):  
Community Structure ◽  
Species Composition ◽  
Temporal Variation ◽  
Fish Species ◽  
Environmental Heterogeneity ◽  
Size Structure ◽  
Local Communities ◽  
Spatial And Temporal Variation ◽  
The Creation ◽  
Fish Species Composition

Different environmental preferences and dispersal abilities allow fish to coexist in local communities. In the present study we analysed the effects of engineering species on the community structure based on the example of the European beaver (Castor fiber) and mountainous European stream fish. We hypothesised that the creation of beaver impoundments increases environmental heterogeneity and causes a strong spatial and temporal variation in fish species composition and size structure. Finally, we placed these results in the context of the metacommunity theory. Our research was conducted over a large spatial scale, and over a relatively long (5-year) temporal scale. Data analysis revealed strong environmental gradients associated with stream size and increased environmental heterogeneity associated with the creation of beaver impoundments. The results also indicated strong spatial and temporal variation in fish species composition and size structure associated with this environmental heterogeneity. Although local communities changed over time, the main metacommunity characteristics remained constant. Fish must move and follow environmental changes for their populations and communities to persist in streams inhabited by beavers. Gaining a deeper understanding of the effects of the engineering species on fish community structure may help inform management and the conservation of stream ecosystems.

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