Populacijska dinamika i preferencija mikrostaništa podzemnih rakušaca u poplavnoj šumi Crni jarki

master's thesis

• Title (english): Population dynamics and microhabitat preferences of subterranean amphipods in the flooded forrest Crni jarki
• Author: Marina Balala
• Mentor: Sanja Gottstein (mentor)
• Committee member: Sanja Gottstein (predsjednik povjerenstva)
• Committee member: Zlatko Liber (član povjerenstva)
• Committee member: Alan Moro (član povjerenstva)
• Committee member: Neven Bočić (član povjerenstva)
• Committee member: Blanka Cvetko Tešović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2016-09-20, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Ekološka ograničenja, dinamika veličinsko-dobne i spolne strukture populacije, te reprodukcijska obilježja i značajke životnog ciklusa stigofilnih rakušaca proučavane su u poplavnoj šumi Crni jarki pokraj Đurđevca. Triplikativni uzorci rakova prikupljani su sezonski godinu dana u tri različita vodena mikrostaništa (protočni ksilal s argilalom, stajaći ksilal s argilalom i protočni fital) pomoću bentos mreže (promjera 21 cm i veličine oka 500 um) tijekom razdoblja povišene razine vodonosnika (ožujak, travanj, svibanj i prosinac). Većina rakušaca je prikupljena u protočnom ksilalu s argilalom. Eudominantna vrsta rakušca u svim mikrostaništima je Synurella ambulans (> 73 %), dok je Niphargus valachicus subrecedentna vrsta (< 8 %). Udio ženki bio je maksimalan na kraju sezone parenja u protočnom fitalu (100 %), dok je udio mužjaka bio maksimalan na početku sezone parenja u stajaćem ksilalu s argilalom (70 %). Juvenilne jedinke su prevladavale tijekom proljeća na kraju sezone parenja u svibnju, dok su odrasle jedinke nestale iz populacije u istom mjesecu. Tijekom istraživanja, žive ovigerne ženke vrste Synurella ambulans su uzorkovane kako bi se utvrdili koeficijenti korelacije između broja jaja i duljine tijela te tjelesne mase. Fekunditet je pozitivno koreliran s veličinom tijela i negativno koreliran s tjelesnom masom. Broj jaja je u rasponu od 11 do 38. Močvarna populacija roda Synurella čini se da ima jednogodišnji životni ciklus.

Abstract (english)

Ecological constraints, dynamics of the size-age structure and sexual structure of the population, and characteristics of reproduction and life history traits of the stigophilic amphipods were investigated in the flooded forest Crni jarki near Đurđevac. The triplicate samples of crustaceans were collected seasonally for one year in three distinct aquatic microhabitats (flowing xylal with argylal, standing xylal with argylal and flowing phytal) using a benthos net (diameter 21 cm, and 500 µm mesh size) during the periods of elevated aquifer levels (March, April, May, and December). The majority of amphipods were collected in flowing xylal with argylal. The eudominant amphipod species (> 73 %) in all microhabitats was Synurella ambulans, while the Niphargus valachicus was subrecedent species (< 8 %). The percentage of females reached its peak (100 %) at the end of breeding season in flowing phytal, while the percentage of males peaked (70 %) at the beggining of breeding season in standing xylal with argylal. Juveniles were prevailed during the spring at the end of the breeding season in May, while adult specimens were disappeared from the population in the same month. During the study, live ovigerous females of Synurella ambulans were sampled in order to determine correlation coefficients of the number of eggs with the body length and body mass. Fecundity was positively correlated with body size and negatively correlated with body mass. The egg counts ranged from 11 to 38. The wetland population of Synurella appears to have a one-year life cycle.

• Keywords: Synurella ambulans; životni ciklus; Drava; podzemna voda
• Keywords (english): Synurella ambulans; life cycle; Drava; groundwater
• Language: croatian
• URN:NBN: urn:nbn:hr:217:215700
• 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: 2017-04-20 14:13:20