Zooplankton communities of two lake outlets in relation to abiotic factors

Oceanological and Hydrobiological Studies

2013

Self Cite

The aim of this study was to answer the following questions: (1) which environmental variables, biotic (fish predation) or abiotic factors, have a greater influence on the rate of zooplankton changes in lake outlet sections and (2) which plankters suffer the greatest reduction in the outlet section.Samples were collected in two locations at each of 18 lakes. The first site was right at the outflow; the second site was 0.2 km downstream from the outflow. At downstream sites the percentage contribution of Rotifera in zooplankton species number and abundance was higher than in the outflow, whilst the percentage contribution of Cladocera and Copepoda (except nauplii) in the zooplankton species number and abundance was lower at downstream sites than in outlets. The most important variables affecting the rate of zooplankton reduction in the lake outlets are the biomass of cyprinids and hydrological parameters along the outlet, such as discharge, current velocity, and depth.The most dramatic reductions involved daphnids, adult copepods, small cladocerans, and copepodites, while the reduction in the abundance of rotifers and nauplii was statistically insignificant.

Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reduction of zooplankton communities in small lake outlets in relation to abiotic and biotic factors

Oceanological and Hydrobiological Studies

2013

Self Cite

“…Most authors investigating the zooplankton of rivers and small streams argue that the river regime is the main factor affecting the zooplankton community dynamics (Pace et al 1992, Campbell 2002, Walks & Cyr 2004, Basu & Pick 1996, Czerniawski & Domagała 2010a, Czerniawski & Pilecka-Rapacz 2011. In addition, in the outflows of highly eutrophic lakes, even the impact of chemical parameters is visible.…”

Section: Introductionmentioning

confidence: 99%

Potamozooplankton communities in three different outlets from mesotrophic lakes located in lake-river system

Oceanological and Hydrobiological Studies

2011

Self Cite

Qualitative and quantitative composition of potamozooplankton was studied in three outlets from mesotrophic lakes. The greatest taxonomic and quantitative similarity of zooplankton occurred between the outflows of the second and third lake, located in the lake-river system. The farther the lake was located in the lake-river system, the greater was the quantity of zooplankton in the outflow. Within a short distance between the outflow and the downstream section, there was a strong reduction of cladocerans' communities, followed by copepods, while the communities of rotifers were reduced in relatively small quantities. The hydrological conditions and transparency had a strong impact on the rate of changes in the zooplankton community.

Small dams profoundly alter the spatial and temporal composition of zooplankton communities in running waters

Internat. Rev. Hydrobiol.

2014

Self Cite

We analyzed the influence of a small dam on the temporal and spatial properties of zooplankton communities by comparing the zooplankton composition established prior to the dam's construction to that during 5 years after its construction. The dammed water of a small dam, even just by 1 m, induced spatial changes in the zooplankton communities similar to those induced by a large dam. Changes in the number of taxa and zooplankton densities were observed a few months after the construction of the dam. In particular, in the number of planktonic rotifers such as Keratella cochlearis, Filinia longiseta, Polyarthra longiremis, Trichocerca similis and the larval stages of copepods considerably increased, along with the density of the littoral taxa of rotifers and crustaceans. Cladocerans appeared in the impoundment after the construction of the dam and their abundance increased in the second year after the dam was built. The abundance of all systematic groups of zooplankton increased in subsequent years after the construction of the dam. The small dam had a great effect on the spatial and temporal composition of the zooplankton communities in the stream studied, related to an abrupt change in the physical conditions from those typical of flowing water to those typical of limnetic basins.