Naslov
Long term assessment of ecological status of two karstic lakes (Plitvice Lakes NP, Croatia) using three multimetric diatom indices

Autori
Žutinić, Petar ; Berković, Buga ; Gligora Udovič, Marija ; Kralj Borojević, Koraljka ; Plenković-Moraj, Anđelka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Program & Abstracts, 24th International Diatom Symposium, Québec, Canada, 21-26 August 2016 / Pienitz, Reinhard ; Zimmermann, Claudia - Quebec : Université Laval, 2016, 249-249

Skup
24th International Diatom Symposium

Mjesto i datum
Quebec, Kanada, 21.08.2016. - 26.08.2016

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
diatoms; Plitvice; karstic lakes; ecological status; long term assessment; diatom indices

Sažetak
Phytobentos is one of biological quality elements used for ecological status assessments of lakes, as required by the Annex V of the Water Framework Directive. Assessments primarily focus on diatoms as proxies for phytobenthos, thus offering an accessible perception of the changes and pressures shaping the benthic community. Several different methods and indices comprising abundance and taxonomic composition of diatoms are used in EU countries. Earlier research of the phytobenthic flora was carried out on lakes Kozjak and Prošće (Plitvice Lakes National Park, Croatia) during 2009 and 2010. Aim of this phase of research was to test the sensibility and applicability of three multimetric diatom indices in the water quality assessment: 1) Croatian trophic diatom index (TIDRH), modified from Rott's trophic index ; 2) Pollution Sensitivity Index (IPS) ; and 3) saprobic index (SIHRIS), modified from Pantle-Buck’s saprobic index. Results showed that the phytobenthic community in Lake Kozjak was characterized by Achnanthidium minutissimum, Brachysira vitrea and Encyonema muelleri. According to TIDRH (range 1.5-2.3) ecological status of Lake Kozjak was assessed as high. The IPS index (range 16.5-18.5) indicated high ecological status, while SIHRIS (range 1.4-1.9) indicated good to high status of the lake. Benthic community of Lake Prošće was characterized by Achnanthidium minutissimum, Cyclotella meneghiniana, Cyclotella plitvicensis, Encyonopsis microcephala, Encyonopsis minuta, Fragilaria capucina, Fragilaria crotonensis, Kobayashiella parasubtilissima and Stephanodiscus hantzschii. The range of TIDRH (2.2-2.5) indicated good ecological status of this lake. According to both IPS (range 14.3- 17.5) and SIHRIS (range 1.7-2.0) indices status of Lake Prošće was assessed as good to high. The ongoing research in 2015 and 2016 aims to assemble perennial data using the same sampling methodology during the same temporal interval and the same spatial position in order to provide a comparable statistical evaluation of ecological status of the Plitvice Lakes. Moreover, after the calibration process the aggregated data will be compared and the results will be further discussed in terms of ecological assessment status.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA