Naslov
Temporal dynamics of aquatic insect (Heteroptera and Coleoptera) assemblages in a temperate floodplain associated with flood pulses

Autori
Turić, Nataša ; Radović, Andreja ; Vignjević, Goran ; Sudarić-Bogojević, Mirta ; Temunović, Martina ; Merdić, Enrih

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

Izvornik
Book of abstracts: 1 st Central European Symposium for Aquatic Macroinvertebrate Research and 11 th Hungarian Symposium for Aquatic Macroinvertebrate Research 10‐13 April 2014, Szarvas, Hungary / Mauchart , Péter ; Csabaim Zoltán - Pečuh, 2014, 76-77

Skup
1 st Central European Symposium for Aquatic Macroinvertebrate Research and 11 th Hungarian Symposium for Aquatic Macroinvertebrate Research

Mjesto i datum
Szarvas, Mađarska, 10.04.2014. - 13.04.2014

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
flood flux; Heteroptera; Orthoptera

Sažetak
Lowland riverine floodplains are regarded as one of the most dynamic and heterogeneous ecosystems. When are in natural state, they cover a variety of water bodies related with flood pulses, representing the hot spots of high and specific biodiversity that is often under protection. The abundance and assemblage structure of aquatic insects (Heteroptera and Coleoptera) between different hydrologic phases caused by various intensity and duration of flooding in Danubian floodplain were investigated in order to determine how flood pulses and other hydrological conditions affect the structure of aquatic insect assemblages. In addition, we assessed if survival of threatened aquatic insects (Graphoderus bilineatus and Berosus geminus) depends on extreme floods. Aquatic insects were collected every two weeks from April through November during 2005 and from 2007 to 2011 in the Kopački rit floodplain (Croatia). Years with prolonged floods of high intensity supported greater total abundance and richness of aquatic insect fauna in contrast to the frequent and intermittent flooding characterising the hydrological regime in 2007 and 2008 or extremely dry year of 2011. Assessment of hydrological conditions pointed out the importance of the temporal scale of a perturbation where spring floods have a more pronounced effect on aquatic insect assemblages compared to autumn floods. Expected “time lag” between the flood occurrence and their apparent effect on aquatic insects is 17 to 31 day which is related with their life cycles. Modelling the abundance of two threatened water beetle species indicates their dependence on extreme floods. Abundance of Graphoderus bilineatus (Coleoptera: Dytiscidae) is affected by the number of days with water levels higher than +250 cm, whereas abundance of Berosus geminus (Coleoptera: Hydrophilidae) is related with prolonged high floods. Changes in flow management of river Danube could remove the structuring influence of floods on aquatic insect communities and can lead to dramatic loss of threatened species. These groups of aquatic insects could be valuable for evaluation and prioritization of international floodplain conservation effort.

Izvorni jezik
Engleski

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