Astakofauna Maksimirskih jezera

master's thesis

• Title (english): Crayfish fauna of the Maksimir lakes
• Author: Vanja Njegovan
• Mentor: Ivana Maguire (mentor)
• Committee member: Ivana Maguire (predsjednik povjerenstva)
• Committee member: Ana Galov (član povjerenstva)
• Committee member: Jasenka Sremac (član povjerenstva)
• Committee member: Neven Bočić (član povjerenstva)
• Committee member: Alan Moro (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2016-09-23, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Četiri od pet europskih vrsta slatkovodnih rakova iz porodice Astacidae nastanjuje slatkovodna staništa Hrvatske: Austropotamobius pallipes, Austropotamobius torrentium, Astacus astacus, Astacus leptodactylus. Rakovi iz porodice Astacidae ključne su vrste u slatkovodnim ekosustavima. Izravno su ugrožene brojnim antropogenim pritiscima poput regulacije vodotoka, crpljenja vode, klimatskih promjena i unosa invazivnih stranih vrsta. S obzirom da na području Parka Maksimir (spomenik parkovne arhitekture, zaštićeno kulturno dobro) nisu provođena istraživanja astakofaune, glavni cilj ovog istraživanja bio je po prvi puta istražiti astakofaunu maksimirksih jezera. Također, cilj je bio procijeniti veličinu i strukturu populacija, kao i omjere spolova, morfometrijske značajke, udio ozljeda i kondiciju jedinki te ih međusobno usporediti. Provedenim istraživanjem utvrđene su dvije vrste rakova u Maksimirskim jezerima: Astacus astacus (prisutna u Četvrtom i Petom jezeru) i Astacus leptodactylus (prisutna u Drugom i Trećem jezeru). Ustanovljeno je da su populacije obje vrste stabilne te da se međusobno statistički značajno razlikuju u tjelesnoj kondiciji, omjeru spolova, udjelu ozljeda i mjerenim morfometrijskim parametrima. Zabilježene razlike najvjerojatnije su posljedica različitih tehnika lova, predacije stranih invazivnih vrsta kornjača i intraspecijske kompeticije. Dobiveni podaci poslužiti će kao inicijalna baza podataka u svim daljnjim istraživanjima astakofaune na tom području te kao podloga potencijalnim planovima upravljanja rakovima u Parku Maksimir.

Abstract (english)

Four out of five European crayfish species from Astacidae family inhabit Croatian freshwaters: Austropotamobius pallipes, Austropotamobius torrentium, Astacus astacus, Astacus leptodactylus. Crayfish species are the keystone species in freshwater ecosystems. Due to the increasing anthropogenic pressures, such as water regulation and water extraction, climate change and the introduction of invasive alien species, indigenous crayfish species are under increasing threat. The aim of this research was to study, for the first time, distribution and presence of crayfish in the urban area (artificial lakes) of Maksimir Park. Additionally, the goal was to estimate population size and structure, morphometric characteristics, the proportion of injuries and crayfish body condition. Two crayfish species were recorded in the Maksimir lakes: Astacus astacus (present in the Fourth and Fifth lake) and Astacus leptodactylus (present in the Second and Third Lake). Populations of both species are relatively abundant and stable. Significant differences in body condition, sex ratio, the proportion of injuries and measured morphometric parameters were recorded between species. Recorded differences are most likely the result of different trapping techniques applied, predation of alien invasive species of turtles and intraspecific competition. Obtained results will serve as a baseline for further research and monitoring of the crayfish fauna in Maksimir lakes.

• Keywords: Astacus astacus; Astacus leptodactylus; morfometrija; Park Maksimir
• Keywords (english): Astacus astacus; Astacus leptodactylus; morphometry; Maksimir Park
• Language: croatian
• URN:NBN: urn:nbn:hr:217:336837
• 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
• Created on: 2017-05-12 07:08:02