20.500.12556/RUL-173375 Structure of planktonic and benthic diatom communities in the Zelenci spring Struktura planktonskih in bentoških združb kremenastih alg v izviru Zelenci This study focused on the diatom communities in the limnocrene spring Zelenci, chosen for its unique structure. Our aim was to assess how underwater springs and abiotic factors influence the structure of diatom communities in different habitats. Four sampling sites were chosen, two for tychoplankton and two for epipelon, located on the accessible side of the pool. Plankton was collected from the piers using a plankton net and epipelon was collected from the silty substrate in the littoral zone. Abiotic parameters were measured on all sites, and water samples were taken for chemical analysis. Different statistical analyses were performed to reveal the relations between abiotic factors and the structure of diatom communities. Water level and temperature reflected seasonal patterns, higher and colder in winter, lower and warmer in summer. conductivity was relatively high due to the limestone substrate. Occasional peaks in PO₄³⁻, NH₄⁺, and NO₃⁻ were likely caused by anthropogenic activity in the catchment area. Achnanthidium minutissimum was the most abundant species in both mesohabitats, while Navicula was the most numerous genus. Tychoplanktonic communities showed greater internal similarity among samples compared to epipelic communities. The trophic index indicated eutrophic conditions, while the Shannon–Wiener index remained high, particularly at the epipelic sampling sites, reflecting the structural complexity and stability of that mesohabitat. Planktonic diatoms dominated tychoplankton samples, while motile ecological type dominated the epipelon. Of all taxa, 23.5% had some endangerment status, and 31.3% had preferences for oligotrophic conditions. Key factors influencing the Shannon-Wiener diversity index were water level, temperature, and concentration of NH₄⁺. The factors, which are most important for the tychoplankton community, were temperature and NH₄⁺, while the most important factors influencing the structure of epipelon communities were water level, NH₄⁺, pH, and concentration of dissolved oxygen. Študija se je osredotočila na združbe diatomej v limnokrenem izviru Zelenci, izbranem zaradi svoje edinstvene strukture. Naš cilj je bil oceniti, kako podvodni izviri in abiotski dejavniki vplivajo na strukturo diatomejskih združb v različnih habitatih. Izbrali smo štiri vzorčna mesta, dve za plankton in dve za epipelon, ki se nahajajo na dostopni strani izvira. Plankton smo vzorčili s pomola z uporabo planktonske mreže, epipelon pa smo vzorčili s površine meljastega substrata v litoralni coni. Abiotski parametri in vzorci vode so bili merjeni oz. odvzeti za kemijske analize na vseh mestih. Izvedli smo različne statistične analize za ugotavljanje povezav med abiotskimi dejavniki in strukturo diatomejskih združb. Višina vode in temperatura sta odražala sezonske vzorce, voda je bila višja in hladnejša pozimi, nižja in toplejša poleti. Prevodnost je bila relativno visoka zaradi apnenčastega substrata. Občasni vrhovi PO₄³⁻, NH₄⁺ in NO₃⁻, so verjetno posledica antropogenih dejavnosti v prispevnem območju. Achnanthidium minutissimum je bil najštevilčnejši takson v obeh mesohabitatih, medtem ko je bil najštevilčnejši rod Navicula. Tihoplanktonske združbe so pokazale večjo notranjo podobnost med vzorci v primerjavi z epipeličnimi združbami. Trofični indeks je nakazoval evtrofne razmere, medtem ko je bil Shannon–Wienerjev indeks visok, zlasti na epipeličnih vzorčnih mestih, kar odraža strukturno kompleksnost in stabilnost tega mezohabitata. Planktonske diatomeje so prevladovale v planktonskih vzorcih, medtem ko so vrste iz hitrogibljivega ekološkega tipa prevladovale v epipelonu. Od vseh taksonov je imelo 23,5% status ogroženosti, 31,3% pa preference za oligotrofne razmere. Ključni dejavniki, ki vplivajo na Shannon-Wienerjev diverzitetni indeks, so bili nivo vode, temperatura vode in koncentracija NH₄⁺. Dejavniki, ki so najpomembnejši za tihoplanktonsko združbo, so bili temperatura in NH₄⁺, medtem ko so bili najpomembnejši dejavniki, ki vplivajo na strukturo epipelonske združbe, nivo vode, NH₄⁺, pH in koncentracija raztopljenega kisika. limnocrene springs diatoms tychoplankton epipelon Zelenci limnokrenski izviri diatomeje tihoplankton epipelon Zelenci true false false [A. Videska] Angleški jezik Slovenski jezik Magistrsko delo/naloga 2025-09-17 07:16:37 2025-09-17 07:16:43 2025-11-08 03:48:31 0000-00-00 00:00:00 2025 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 556.55(497.4 Zelenci)(043.2) 264653 249245443 51797.pdf 51797.pdf 1 19C3298F4EAA3318D845BF846C7DC9BE 09e64ce0725aacf67ff7a00a3e0cace708306c2ec932385ca7248086f2e74677 556391c9-9385-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=217783 Biotehniška fakulteta 0 0 0