Dinamika populacija vrste Synurella ambulans (Müller, 1846) (Crustacea, Amphipoda) u povremenom izvoru Krčić

master's thesis

• Title (english): Population dynamics of Synurella ambulans (Müller, 1846) (Crustacea, Amphipoda) in the intermittent spring Krčić
• Author: Jelena Babić
• Mentor: Sanja Gottstein (mentor)
• Committee member: Sanja Gottstein (predsjednik povjerenstva)
• Committee member: Sandra Radić Brkanac (član povjerenstva)
• Committee member: Mladen Juračić (član povjerenstva)
• Committee member: Neven Bočić (član povjerenstva)
• Committee member: Vlasta Ćosović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2013-09-20, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Vodeni beskralješnjaci razvili su različite strategije prilagodbe i preživljavanja sušnog razdoblja na povremenim izvorima. Struktura i gustoća populacije te razmnožavanje vrste Synurella ambulans istraživani su na povremenom izvoru Krčić u Srednjoj Dalmaciji kako bi se utvrdila strategija prilagodbe. Postaja predstavlja zonu ekotonskog eukrenala. Istraživanja su provedena jednom mjesečno od travnja 2011. do lipnja 2012. god. tijekom razdoblja protjecanja izvora, s dodatnim uzorkom u travnju 2013. god. Prikupljeni su triplikativni uzorci na tri različita tipa supstrata (mikrolital, megalital i mahovina) te su izmjereni osnovni fizikalno – kemijski čimbenici vode. Cilj ovoga rada bio je odrediti reproduktivnu strategiju (aktivni odnos spolova) i dinamiku populacija u ovisnosti o trajnosti izvora (vremenu i dužini vodene faze). Sezona razmnožavanja vrste S. ambulans na izvoru Krčić odvija se u podzemnim vodama na kraju sušne sezone izvora (od rujna do studenog) jer se juvenilne jedinke pojavljuju tijekom zime (od prosinca do siječnja) ubrzo nakon aktiviranja toka na izvoru. Čini se da ženke legu jaja u podzemnim vodama te imaju jedno leglo, zatim uglavnom ugibaju kada otpuste juvenilne jedinke. Prikupljeno je samo pet ovigernih ženki u siječnju, ožujku, travnju i svibnju te nije bilo moguće odrediti fekunditet. Ova populacija ima univoltini (iteroparni) životni ciklus. Mužjaci i ženke sa izvora Krčić su među najmanjima u Hrvatskoj i Europi, u rasponu ukupne dužine tijela od 2,24 – 5,25 mm mužjaci i 2,38 – 7,35 mm ženke.

Abstract (english)

Aquatic invertebrates have developed different strategies to adapt and to survive the dry season at intermittent springs. The population structure, density (ind. m-2) and reproduction of Synurella ambulans were studied at intermittent spring Krčić in Central Dalmatia to determine the strategy of adaptation. The sampling station represents eucrenal ecotone. Research was conducted once a month from April 2011 to June 2012 during the flow season, and with additional sample from April 2013. Samples were collected at three different types of substrates (microlithal, megalithal and moss) and basic physico - chemical characteristic of water were measured. The aim of the study was to determine reproductive strategy (operational sex ratio) and population dynamic in relation to the spring duration (time and length of the aquatic phase). The reproductive season of S. ambulans at intermittent spring Krčić was determined to be in groundwaters at the end of the dry season of the spring (September to November) because juveniles appeared in winter (December to January) soon after spring actiavation. The females appear to lay eggs in the groundwaters to produce one brood and than mostly die after release of the young. Only five ovigerous females were collected in January, March, April and May and it was not possible to determine fecundity.This population appears to have iteroparous (univoltine) type of life cycle. Males and females from the spring Krčić are among the smallest in Croatia and Europe, ranged from 2.24 to 5.25 mm and 2.38 to 7.35 mm, respectively.

• Keywords: Amphipoda; Crangonyctidae; odnos spolova; gustoća populacija; životni ciklus; podzemlje; stigofili; izvori
• Keywords (english): Amphipoda; Crangonyctidae; sex ratio; population density; life cycle; subterranean habitats; stygophiles; springs
• Language: croatian
• URN:NBN: urn:nbn:hr:217:980683
• 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: 2017-04-25 10:47:12