Naslov
Diel drift patterns of macroinvertebrates within a tufa-precipitating hydrosystem (Plitvice Lakes National Park, Croatia)
(Diel drift patterns of macroinvertebrates within a tufa-precipitating hydrosystem (Plitvice Lakes National Park, Croatia)

Autori
Sertić Perić, Mirela ; Radanović, Ines ; Matoničkin Kepčija, Renata ; Primc, Biserka ; Habdija, Ivan

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

Izvornik
Book of abstracts & programme. 2nd Central European Symposium for Aquatic Macroinvertebrate Research (CESAMIR) / Móra, A. ; Csabai, Z. - Mohács : Pečuh : Carpathes Nature Foundation, 2016, 87-87

Skup
2nd Central European Symposium for Aquatic Macroinvertebrate Research (CESAMIR)

Mjesto i datum
Pečuh, Mađarska, 03.07.2016. - 08.07.2016

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
drift; diel periodicity; biotic controls; fish predation; macroinvertebrates

Sažetak
Drift – a flow-mediated transport of aquatic organisms – is strongly affected by environmental and biotic settings, which can change on various spatio-temporal scales. Spatial drift patterns mostly depend on the spatial distribution of benthic communities, habitat type and physico-chemical properties, as well as on the degree to which organisms are able to move between different patches. Temporal drift fluctuations are greatly influenced by diel and seasonal flow conditions, aquatic and riparian vegetation features, predation-competition interactions, and organisms’ life history strategies. Diel differences in macroinvertebrate drift patterns have mainly been attributed to behavioral cues (i.e., to active drift occurring as a predator-avoidance-mechanism). Due to highly fragmented and heterogeneous habitat structure, karst tufa-precipitating barrage hydrosystems (e.g., Plitvice Lakes National Park, Croatia) have evidenced unique macroinvertebrate drift patterns. Whereas the previous drift investigations within the Plitvice Lakes National Park have primarily been focused on seasonal drift trends (i.e., abiotic controls of macroinvertebrate drift), the present study deals with diel drift periodicity (i.e., potential biotic controls of drift) within the tufa-precipitating Plitvice Lakes barrage hydrosystem. The overall objective of the study was to examine quantitative and qualitative composition of drifting macroinvertebrates between barrier and pool microhabitats aligned along a study reach located within the karst barrage Plitvice Lakes hydrosystem. Specifically, we aimed to compare diel drift patterns between barriers and pools over a one year period (October 2006 – September 2007). Considering the entire study period, barriers displayed significantly (p < 0.0001) higher macroinvertebrate drift densities in comparison to pools. At both microhabitat types, macroinvertebrate drift densities peaked in late spring, and during summer and autumn (i.e., June, July, October), averaging > 100 ind./m3. The peaking drift densities significantly differed (p < 0.05) from the respective late winter/early spring (i.e., February to April) densities, which were about 5-fold lower at both microhabitat types. Monthly drift records yielded a strongly synchronous pattern between day and night. At barriers, drift reached significantly higher (p < 0.05) values during day than at night. Within pools, drifting macroinvertebrates reached slightly (i.e., non-significant, p > 0.05) higher densities during night, showing the reversed drift trend in comparison to barriers. Our results indicate that tufa barriers are loci of intense diel macroinvertebrate drift within the tufa-precipitating Plitvice Lakes hydrosystem. Furthermore, our results could provide an additional insight into life histories and drift behavior of certain macroinvertebrate taxa, as well as into mechanistic relationships between environmental and biotic controls of drift within the studied hydrosystem.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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