Naslov
Morpho-functional classifications of phytoplankton in deep karstic lakes

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

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

Izvornik
SEFS 8 - Symposium for European Freshwater Sciences, July 1-5 2013, Münster, Germany Abstract Book / - , 2013, 444-444

Skup
8th Symposium for European Freshwater Sciences (SEFS 8)

Mjesto i datum
Münster, Njemačka, 01.07.2013. - 05.07.2013

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Phytoplankton assemblages; morpho-functional classifications; deep karstic lakes

Sažetak
Morpho-functional classifications of phytoplankton are increasingly used in ecological studies of different aquatic ecosystems. Classifications based on morphological and functional traits group species with common features and similar structural and functional characteristics in order to achieve a better understanding of the functioning of ecosystems, and are powerful predictors of the dynamics of a particular ecosystem. The aim was to explore the adequateness of the functional classifications in detecting changes in the phytoplankton assemblages of deep karstic lakes by comparing three different classifications: (a) functional groups (FG) by Reynolds et al. (2002) revised by Padisák et al. (2009) ; (b) morphofunctional grups (MFG) by Salmaso and Padisák (2007) ; (c) morphologically based functional groups (MBFG) by Kruk et al. (2010), and to detect how well can the biomass of phytoplankton groups based on different classification systems be explained by environmental conditions in two different karstic lakes. The investigation was conducted in the National Park Plitvice Lakes. Samples were collected monthly throughout 2009 and 2010 at 5 m intervals from the surface to the bottom in the deepest part of the lakes Kozjak and Prošće. Both lakes presented low phytoplankton biomass (Kozjak avg. 0.11 mg l-1 ; Prošće avg. 0.30 mg l-1). Several centric (Cyclotella spp., Discostella stelligera) and pennate diatoms (Synedra sp., Ulnaria ulna var. acus) together with the chrysophycean Dinobryon divergens were dominant in Kozjak, whilst Prošće was characterized by chrysophyceans (D. sociale, D. divergens), cryptophyceans (Cryptomonas sp.) and planktonic diatoms (Stephanodiscus sp., Fragilaria crotonensis). CCA performed on functional classifications revealed that the best results in describing the phytoplankton succession were obtained using the MBFGs approach although it is less sensitive in describing variability of individual descriptive algal groups in this environment than FGs and MFGs. The functional and morphofunctional classification showed a high level of similarity in explaining phytoplankton variability in relation to environmental factors, thus proving to be rather useful and applicable to deep karstic lakes. The functional classification is a more sensitive indicator of the effects of processes in environment than traditional taxonomic classification. Current position of some descriptive species in functional classifications will be discussed in detail.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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