Uzroci i posljedice širenja invazivnih rakušaca u rijeci Dravi na području sjeverozapadne Hrvatske

master's thesis

• Title (english): Causes and consequences of spreading invasive shrimps in the Drava River, NW Croatia
• Author: Franka Prevedan
• Mentor: Sanja Gottstein (mentor)
• Committee member: Sanja Gottstein (predsjednik povjerenstva)
• Committee member: Sandra Radić Brkanac (član povjerenstva)
• Committee member: Jasenka Sremac (član povjerenstva)
• Committee member: Nenad Buzjak (član povjerenstva)
• Committee member: Neven Bočić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2018-07-02, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Širenje invazivnih vrsta u rijeci Dravi predstavlja izravnu prijetnju za autohtone vrste i sveukupnu bioraznolikost ekosustava rijeke Drave. Ciljevi ovog istraživanja bili su utvrditi sastav i bogatstvo autohtonih i invazivnih vrsta u različitim tipovima staništa tri hidroenergetska sustava rijeke Drave, utvrditi osnovne fizikalno-kemijske parametre vode koji uvjetuju naseljavanje istraživanih vrsta rakušaca te podrijetlo i puteve širenja invazivnih vrsta. Tijekom ovog istraživanja od 2009. do 2012. godine te od 2016. do 2017. godine pronađene su tri invazivne vrste: Dikerogammarus vilosus, D. haemobaphes i D. bispinosus podrijetlom iz Ponto-kaspijskog bazena. Odvodni kanali i stari tok rijeke (biološki minimum) predstavljaju tip staništa s najvećom brojnošćuinvazivnih vrsta, dok su autohtone vrste najviše brojne u drenažnim jarcima. Rasprostranjenost vrste D. vilosus ukazuje na trend uzvodnog širenja kroz HE sustave rijeke Drave, kojem osobito pogoduje šljunkoviti supstrat protočnih odvodnih kanala. Ova vrsta je svojom zastupljenošću i gustoćom populacija istisnula populacije invazivnih vrsta D. haemobaphes i D. bispinosus, a na nekim istraživanim postajama uzrokovala potpuni nestanak autohtone faune.

Abstract (english)

The spread of invasive species in the Drava River represents the direct threat to native species and the overall ecosystem biodiversity. The major goals of this study were to determine structure and richness of native and invasive species in all habitat types of the three hydropower systems of the Drava River , as well as their origin, spreading routes and dependence on physicochemical properties causing colonisation of different types of habitats. During this study (2009, 2010, 2011, 2012, 2016, 2017) three invasive species of Ponto-Caspian origin were recorded: Dikerogammarus vilosus, D. haemobaphes and D. bispinosus. Tailrace canals and old river channels (biological minimum)represent the habitat type with the highest abundance of invasive species, while native species were the most abundant in drainage ditches. Distribution of D. vilosus shows its upstream spreading through the HEPP of the Drava River, which particularly prefers stony substrate in flow conditions of tailrace canals. High frequency and abundance of invasiv species D. vilosus has squeezed out populations of other invasiv species such as D. haemobaphes and D. bispinosus, whereas on some study sites this species caused complete dissappearance of native species.

• Keywords: invazivne vrste; Drava; drenažni jarci; uzvodno širenje; nestanak autohtonih vrsta
• Keywords (english): invasive species; river Drava; drain trenches; upstream spreading; dissappearance of native species
• Language: croatian
• URN:NBN: urn:nbn:hr:217:437107
• Study programme: Title: Enviromental Sciences; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra struke znanosti o okolišu (magistar/magistra struke znanosti o okolišu)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2020-08-28
• Created on: 2018-08-28 11:12:07