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Diversity of Aquatic Molluscs in a Heterogenous Section of a Medium-Sized Lowland River-Floodplain System: An Example of Intermediate Disturbance Hypothesis

Jurkiewicz-Karnkowska E.

Polish Journal of Ecology

2015

Vol. 63, nr 4

559--572

Natural river-floodplain systems are heterogenous mosaics of lotic and lentic habitats subjected to dynamic temporal changes connected with hydrological regime, which promote high biological diversity. Mollusc assemblages of three habitat types within 10 km section of the lower course of the Liwiec River (East Poland) — the main river channel (MC), the secondary channel (SC) and remnants of the former river channel (FC), were compared to find if they were structured by heterogeneity resulting from hydrological connectivity and disturbance intensity related to it. The influence of selected qualitative environmental variables was also analysed. The investigations were carried out at 19 sites during late spring and late summer in the years 2012–2014, molluscs were sampled from approximately 1 m2 of the bottom with a hand net, and from macrophytes with a frame. Rich aquatic malacofauna (36 species including 22 gastropods and 14 bivalves) was found within the study area including three species of special interest: Anisus vorticulus (Troschel), Unio crassus Phillipsson and Anodonta cygnea (L.). Bivalves Sphaerium corneum (L.) and Pisidium spp dominated within MC, in SC a few common and ubiquitous species (mainly snails) prevailed, pulmonate snails and some small bivalves of the genus Pisidium were the most numerous molluscs within FC. Principal Component Analysis revealed that current velocity, channel width, bottom sediments and macrophyte abundance were important environmental factors structuring mollusc assemblages. Considerable variation in species composition (β diversity), especially between the main river channel and two other habitat types (β2) was found. The highest values of mean species richness, Shannon true diversity and Shannon index found in the secondary channel were in accordance with intermediate disturbance hypothesis.

Water of springs in Trzciągowska Valley (buffer protection zone**** and areas of Wolin National Park) - results of chemical investigations

Poleszczuk O., Bucior A., Grzegorczyk K., Suzin B.

Chemia i Inżynieria Ekologiczna

2005

Vol. 12, nr 11

1267-1279

Between August of 2003 and February 2004, 22 chemical parameters of water quality from 4 sources springing in Trzciągowska Valley were studied where 2 of them were not investigated ret. The evaluation of waters was based upon official criteria for evaluation of surface inland freshwater and underground water qualities. Carried researches proved that waters from studied sources were of poor quality and also were chemically differentiated what points out the municipal sewage pollution in zone of spring alimentatian from water-bearing layers.

W okresie od sierpnia 2003 do lutego 2004 r. badano 22 fizykalne i chemiczne wskaźniki jakości wód 4 źródeł wybijających w Dolinie Trzciągowskiej, z których 2 dotychczas nie badano. Ocenę jakości tych wód przeprowadzono zgodnie z urzędowymi kryteriami służącymi do oceny jakości śródlądowych wód powierzchniowych i zwykłych wód podziemnych. Prowadzone badania udowodniły, że wody badanych źródeł były bardzo złej jakości, a także znacznie różniły się składem chemicznym, co przemawia za tym, że chemizm badanych wód był najprawdopodobniej ostatecznie ukształtowany przez lokalne źródła zanieczyszczeń o charakterze punktowych źródeł antropogennych, zasilających wody podziemne wzdłuż drogi ich przesączania się przez strefę wodonośną.