Naslov
Diel patterns of macroinvertebrate drift in a tufa-depositing barrage hydrosystem

Autori
Podgornik, Gala ; Ivica, Nedjeljka ; Sertić Perić, Mirela

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

Izvornik
Symbiose 2010, Turkey, Book of Abstracts / Symbiose 2010 Turkey Organising Team - Eskisehir, 2010, 14-15

Skup
Symbiose 2010

Mjesto i datum
Eskişehir, Turska, 30.07.2010. - 09.08.2010

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
drift; macroinvertebrates; karst streams; tufa; diel periodicity

Sažetak
Karst streams represent special aquatic habitats, recognized worldwide as hotspots of biodiversity. They are widespread throughout the Dinaridic karst region of southeastern Europe. Unique features of karst hydromorphology and karst biodiversity are of growing interest to contemporary ecology issues and many researchers. Macroinvertebrate drift and organic matter transport have often been viewed as phenomena that ensure the dynamics of stream communities (Waringer 1992, Robinson et al. 2002, Fenoglio et al. 2005). The downstream transport and continuous re-distribution of (in)organic matter particles are important to many ecosystem processes as those particles take part in shaping instream habitats and ecosystem organic matter budgets (e.g., Cummins et al. 1983, Allan 1995). Macroinvertebrate drift includes both passive and active movements of macroinvertebrates (Mackay 1992) and enables organisms to escape detrimental conditions or colonize new habitats (Townsend & Hildrew 1976, Brittain & Eikeland 1988). An interesting aspect of drift is diel drift periodicity whereby the number of individuals drifting changes over a 24-hour period. Maximal drift densities of the majority of species occur predominantly at night (Smock 2006). We designed the present study to explore diel drift patterns within a karst barrage hydrosystem. The objective of the study was to examine diel differences in drifting macroinvertebrates and organic and inorganic matter particles among hydromorphologically different aquatic habitats at a fine spatial scale within a study reach in the karst barrage hydrosystem of Plitvice Lakes, Croatia. Apart from barrage lakes, the most common instream features within this hydrosystem are moss-covered tufa barriers and waterfalls. Considering our results and differences in the drifting behavior between taxa, we assume that occurrence frequencies of drift taxa within sites likely depend on the position and substrate composition of the sites along the study reach and their distance from moss-covered tufa barriers. We suggest that diel and fine-scale spatial patterns in drift primarily depend on the special features of the observed hydrosystem, such as specific instream habitat characteristics and differences in flow velocity among sampling sites.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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