The results indicated that stocked brown trout (AT) adapt rapidly to the new habitat and food, as revealed by the consumption of a wide range of available food items and competition for food and space by taking on the feeding behaviour of wild native conspecifics. The differences in variation of the consumed prey items were analysed by canonical variate analysis, and diet overlap was assessed by the Schoener index. Canonical Correspondence Analysis was used to analyse the relationships between feeding habits of fish from different streams and of different genetic origin. The aim of this study was to examine the natural diet of brown trout of both lineages and their hybrids, and to compare feeding overlap.
The diet of brown trout in the Black Sea Basin of Croatia is poorly known and there are no studies examining feeding competition between the Atlantic (AT) and Danube (DA) lineages of brown trout and their hybrids (HY). Rezultati ovog istraživanja ukazuju da su izvori hrane i interakcije unutar vodenih biocenoza bile glavne odrednice u strukturiranju entomofaune odnosno makrozoobentosa u sastojinama submerznih makrofi ta.īrown trout of non-native lineages have been stocked into Croatian streams and rivers primarily to meet angler demand. Između funkcionalnih hranidbenih skupina detritovori su postigli najveći udio (81 %) u ukupnoj abundanciji. i Diptera (23 % u R1M i R2M) s dominacijom jedinki iz skupine Tanitarsini najviše su pridonijeli ukupnoj abundanciji. Ephemeroptera (R1M 66 %, R2M 76 %) s dominantnom svojtom Cloeon sp. m-2) dok je na postaji R2M maksimum abundancije postignut u proljeće (472 jed. Najveća abundancija postignuta je zimi na postaji R1M (544 jed. Ukupno je utvrđeno 19 svojti, od kojih je 14 svojti bilo prisutno na postaji R1M, a upola manje na postaji R2M.
Ostali istraživani čimbenici uglavnom su ukazivali na značajne sezonske razlike. Između ujezerenja nisu utvrđene značajne razlike abiotičkih niti biotičkih čimbenika, izuzev veće abundancije aktivnih fi ltratora u litoralnoj zoni s makrofi tima u ujezerenju 1 (R1M) u odnosu na ujezerenje 2 (R2M). Glavni IZVORNI ZNANSTVENI ČLANCI ORIGINAL SCIENTIFIC PAPERS 8 ciljevi ovog istraživanja bili su analizirati: (i) fi zičko-kemijske čimbenike i izvore hrane (ii) abundanciju i raznolikost te (iii) funkcionalne hranidbene skupine entomofaune. U provedenom istraživanju razmatrana je raznolikost, abundancija i funkcionalne hranidbene skupine akvatičke entomofaune u submerznim sastojinama umjetnih ujezerenja potoka Jankovac (Park prirode Papuk). RADANOVIĆ: Entomofauna sastojina submerznih makrofi ta u umjetnim ujezerenjima (Park prirode Papuk). Littoral zone, Ephemeroptera, Cloeon, Diptera, functional feeding guilds M.
#Jed cyr ed riffle drivers#
Results of this study suggested that food resources and biotic interactions are main drivers in structuring entomofauna, i.e., macroinvertebrate community in submerged macrophyte stands. Among feeding guilds the greatest contribution in abundance achieved detritivores (81 %). Ephemeroptera (R1M 66 %, R2M 76 %) with domination of Cloeon sp., and Diptera (23 % in R1M and R2M) with dominated Tanitarsini specimens contributed at most in total abundance. Highest abundance was reached in R1M in winter (544 ind m-2), and in R2M in spring (472 ind m-2). In total 19 taxa were identifi ed, among them 14 in R1M, and half less in R2M. Other parameters mostly showed signifi cant seasonal oscillations. Between reservoirs non signifi cant differences were observed in regard to abiotic or biotic parameters, except higher abundance of active fi lterers in vegetated littoral zone of Reservoir 1 (R1M) than in Reservoir 2 (R2M).
The main aims of this study were to analyse: (i) physico-chemical parameters and food resources (ii) abundance and diversity and (iii) functional feeding guilds of entomofauna. In this study diversity, abundance and functional feeding guild of aquatic entomofauna were assigned within submerged macrophyte stands in Jankovac Stream reservoirs (Papuk Nature Park).
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