Populacijska dinamika vrste Gammarus balcanicus Schäferna, 1922 (Crustacea, Amphipoda) u eukrenalu rijeke Žrnovnice

master's thesis

• Title (english): Population dynamics of Gammarus balcanicus Schäferna, 1922 (Crustacea, Amphipoda) in eucrenal of the River Žrnovnica
• Author: Mirna Katalinić
• Mentor: Sanja Gottstein (mentor)
• Committee member: Sanja Gottstein (predsjednik povjerenstva)
• Committee member: Blanka Cvetko Tešović (član povjerenstva)
• Committee member: Nenad Buzjak (član povjerenstva)
• Committee member: Sandra Radić Brkanac (član povjerenstva)
• Committee member: Neven Bočić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2016-07-11, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Detaljni podaci o dinamici populacije vrste Gammarus balcanicus na izvoru rijeke Žrnovnice ne postoje, unatoč njenoj širokoj rasprostranjenosti i velikoj važnosti u kruženju tvari u potocima i rijekama. U skladu s tim, cilj ovog istraživanja bio je istražiti ekologiju i neke aspekte reproduktivne biologije ove vrste. Istraživanje je provedeno tijekom četiri sezone od zime 2013. do jeseni 2014. godine u eukrenalu izvora rijeke Žrnovnice. Standardni fizikalno-kemijski parametri vode mjereni su mjesečno od prosinca 2013. do prosinca 2015. godine. Replikativni kvantitativni uzorci (modificirani AQEM protokol) prikupljeni su pomoću Surber mreže jednom u sezoni. U laboratoriju su jedinke klasificirane prema ontogeniji, reproduktivnom statusu i spolu tijekom svake sezone na različitim mikrostaništima. Cilj rada bio je istražiti ključne abiotičke ekološke čimbenike tijekom godišnjih doba, dinamiku populacije istraživane vrste i različite aspekte životnog ciklusa. Nije bilo značajne sezonske varijacije u fizikalno-kemijskim parametrima, a uvjeti koji vladaju u eukrenalu ukazuju na oscilacije temperature vode manje od 1 °C. Vrsta Gammarus balcanicus na izvoru rijeke Žrnovnice najviše obitava na fitalu na kojem je dominantna s obzirom na gustoću jedinki i veličinu tijela. Mužjaci su obično brojniji i veći od ženki, a ovigerne ženke i juvenilne jedinke pojavljuju se u svim godišnjim dobima. Ženke pokazuju veću brojnost u toplijim mjesecima. Sezona razmnožavanja vrste G. balcanicus je tijekom cijele godine zbog stalne temperature vode na izvoru rijeke, a rezultat je i utjecaja mediteranske klime te prosječno više srednje godišnje temperature zraka.

Abstract (english)

So far there are no detailed data on the population dynamic of Gammarus balcanicus in the Žrnovnica spring despite its wide range and great importance in matter circulation in streams and rivers. In concordance with that, the aim of this study was to investigate the ecology and some aspects of reproductive biology of the species. Field studies were carried out across the four season from winter 2013 to autumn 2014 at eucrenal of the Žrnovnica spring. Standard physical and chemical parameters of water were measured monthly from December 2013 to December 2015. Quantitative replicate samples (modified AQEM protocol) were collected using a Surber net once per season. In the laboratory, the specimens were classified according to their ontogeny, reproduction status and sex during the each season on various microhabitats. The aim was to examine the range of abiotic environmental conditions during the seasons, population dynamics of the species, and some aspects of life history traits. There were no significant seasonal variations in physico-chemical parameters and temperature which confirmed eucrenal conditions with less than 1 °C of fluctuations. Species Gammarus balcanicus at the spring of the River Žrnovnica prefer fital on which they are prevalent according to their number and size. Males are generally more numerous and larger than females, and ovigerous females and juveniles occur in all seasons. Females show a greater abundance in the warmer months. The breeding period of G. balcanicus is ongoing through the whole year because of constant water temperature at the spring source as well as a result of the influence of Mediterranean climate and higher average annual air temperature.

• Keywords: krški izvor; fizikalno-kemijski parametri; mikrostaništa; sezone; razmnožavanje; životni ciklus
• Keywords (english): karst springs; physico-chemical features; microhabitats; seasons; reproduction; life history
• Language: croatian
• URN:NBN: urn:nbn:hr:217:524855
• 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: Closed access
• Created on: 2017-05-05 12:14:12