Naslov
The impact of invasive amphipod Dikerogammarus villosus on leaf litter decomposition in the Drava river

Autori
Kralj, Tomislav ; Valić, Damir ; Martinović, Ana ; Žganec, Krešimir

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

Izvornik
Zbornik sažetaka 14. hrvatskog biološkog kongresa = Book of abstracts of the 14th Croatian biological congress / Caput Mihalić, Katarina ; Mičetić Stanković, Vlatka ; Urlić, Inga ; Mešić, Armin ; Kružić, Petar (ur.) - Zagreb : Hrvatsko biološko društvo, 2022, 58-59

Skup
14. hrvatski biološki kongres s međunarodnim sudjelovanjem = 14th Croatian biological congress with international participation

Mjesto i datum
Pula, Hrvatska, 12.10.2022. - 16.10.2022

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
benthic community ; native ; invasive Amphipoda ; shredder ; Drava River

Sažetak
Freshwater amphipods have important role in decomposition of coarse particulate organic matter and often represent key species in aquatic food webs and organic matter cycling. The aim of this study was to test the differences in leaf litter decomposition rates between two pairs of sites, with and without invasive amphipod Dikerogammarus villosus. The experiment was conducted in October 2021 at two locations on the Drava River in Croatia ; at each location at upstream site only native species were present, while at downstream site D. villosus co-occurred with native species. At each site 30 leaf bags (15 fine leaf bags for control and 15 coarse leaf bags) were placed into water containing 2.5 g of willow leaves dried for 16 hours at 60°C and sampled three times (after 3, 7 and 11 days). Leaves were conditioning in stream water for one week before the experiment. Leaf decomposition rates for coarse leaf bags were 1.1- 6.9 times lower at sites where D. villous was present, but significant difference between sites was established only at one location. The correlation between dry mass of native amphipods and leaf litter mass loss was significant at both sites (rs=0.44 and 0.65), while negative correlations were established for dry mass of D. villosus (rs=-0.55 and -0.33). These results indicate that invasion of D. villosus changes important functional role which native gammarids have in decomposition of leaf litter in the Drava River.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA