Planktonske zajednice u umjetnim ujezerenjima potoka Jankovac (Papuk)

master's thesis

• Title (english): Plankton communities in the Jankovac stream artificial lakes (Papuk)
• Author: Jasmina Šargač
• Mentor: Maria Špoljar (mentor)
• Committee member: Sven Jelaska (predsjednik povjerenstva)
• Committee member: Dubravka Hranilović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2010, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Istraživanje je provedeno na lotičkim (JI i JS) i lentičkim (J1, J1M, J2, J2M) postajama longitudinalnog profila potoka Jankovac (Park prirode Papuk) u razdoblju od svibnja do listopada 2008. godine. Osnovna hipoteza rada bila je da hidrološka obilježja i postotak prekrivenosti dna vodenim makrofitima utječu na razvoj, produkciju i bioraznolikost planktonske zajednice u protočnom hidrosustavu. Ciljevi istraživanja bili su sljedeći: 1. kvalitativna i kvantitativna analiza zoosestona u tekućem (lotičkom) i ujezerenom (lentičkom) dijelu potoka; 2. utjecaj brzine strujanja vode na veličinske kategorije organizama u zoosestonu; 3. analiza pronosa sestona u lotičkom i lentičkom dijelu potoka; 4. utjecaj fizičko-kemijskih parametara na biocenoze u staništima. Prostorne promjene mjerenih fizičko-kemijskih čimbenika pokazivale su statistički značajne razlike (p<0,05) između lotičkih i lentičkih staništa. Na lotičkim postajama u sastavu sestona prevladavale su anorganske (1,8 ± 0,6 mg/L), a u lentičkim organske čestice (8,9 ± 16 mg/L). Ukupno je determinirano 95 svojti od čega najviše Rotifera (63 svojti), Cladocera (17 svojti) i Copepoda (10 svojti). Prema načinu života na lotičkim postajama u biomasi zoosestona prevladavali su bentoski organizmi (56-98%), dok su na lentičkim postajama, ujezerenjima, prevladavali euplanktonski (20-99%) i semiplanktonski organizmi (20-80%). U biomasi zoosestona dominirale su veličinske kategorije organizama od 1000-1500 μm (40%) i >1500 μm (43%) kojima pripadaju skupine Cladocera, Copepoda i Oligochaeta. U veličinskim kategorijama od 45 do 500 μm najbrojniji su bili predstavnici Rotifera, a obilježavao ih je mali udio u biomasi. U protočnom hidrološkom sustavu potoka Jankovac lentičke postaje zbog retencije vode omogućuju razvoj planktonske zajednice. Planktonske zajednice u jezerima, u zoni makrofita, predstavljaju vrlo produktivna staništa s velikom brojnošću i raznolikošću organizama. Staništa s makrofitima glavna su mjesta produkcije i omogućavaju stvaranje dovoljne količine hrane bentičkim organizmima nizvodno u protočnom sustavu.

Abstract (english)

Research was conducted on lotic (JI, JS) and lentic (J1, J1M, J2, J2M) study sites on the longitudinal profile of Jankovac stream (Nature Park Papuk) from May until October 2008. Main hypothesis in this study was that the hidrological features of running waters and the percentage of macrophytes cover have significant influence on development, production and biodiversity of plankton communities. Aims of this study were: 1. to analyze qualitative and quantitative structure of zooseston on lotic and lentic study sites; 2. to analyse influence of current velocity on organisms size categories; 3. to analyse transport of seston on lotic and lentic stations; 4. to analyse the effect of physical and chemical factors on seston structure in running waters. There were significant differences (p<0,05) between lotic and lentic study sites in physical and chemical factors. Lotic stations consisted mostly of inorganic particles (average 1,76 ± 0,64 mg/L), while lentic stations had higher amount of organic particles (average 8,85 ± 15,98 mg/L). A total of 95 taxa were identified among them: Rotifera 63, Cladocera 17 and Copepoda 10 taxa. Lotic study sites achieved higher contribution of benthic organisms (56-98%) whereas lentic stations consisted mostly of euplanktonic (20-99%) and semiplanktonic organisms (20-80%). The major part in zooseston biomass (44%) constituted organisms with body size from 1000 to 1500 μm, i.e. Cladocera, Copepoda and Oligochaeta. Rotifers mainly contributed to organisms biomass with body size, from 45 to 500 μm. In Jankovac stream lentic habitats with longer period of water retention contributed to development of numerous plankton community. Macrophyte zones in lentic part of running wters represent very productive habitats with maximum biodiversity and density. Also, macrophyte zones are the main habitats of production and provide sufficient amount of food for downstream benthic organisms.

• Keywords: lotik; lentik; zooseston; submerzni makrofiti
• Keywords (english): lotic; lentic; zooseston; submergent macrophytes
• Language: croatian
• URN:NBN: urn:nbn:hr:217:535010
• Study programme: Title: Biology; specializations in: Ecology; Course: Ecology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra biologije (magistar/magistra biologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2018-04-04 09:18:15