Rezultati su pokazali da su sedrotvorni procesi najintenzivniji u osun\u010danim dijelovima s jakim protokom vode, dok su u zasjenjenim i hidrodinami\u010dki mirnijim podru\u010djima znatno slabiji.<\/p>\n
Najve\u0107i intenzitet osedravanja zabilje\u017een je u Zoni 2, koja obuhva\u0107a osun\u010dane barijere i slapove s jakim protokom vode. U tom podru\u010dju dominiraju mahovinske zajednice, prvenstveno vrste Palustriella commutata<\/em> i Didymodon tophaceus, <\/em>koje pru\u017eaju optimalne povr\u0161ine za inkrustaciju kalcita. U toj je zoni brzina rasta sedre bila najve\u0107a, a mikroskopska analiza pokazala je prisutnost izrazito poroznih i slojevito talo\u017eenih karbonatnih naslaga. Veliku ulogu u osedravanju imaju i zajednice sesilnih \u017eivotinja koje nastanjuju mahovinske zajednice \u2013 Bryozoa (mahovnjaci).<\/p>\n Zona 3, smje\u0161tena u nizvodnom ujezerenju ispod glavnog slapi\u0161ta (biv\u0161eg kupali\u0161ta), pokazala je znatne sukcesijske promjene, pri \u010demu su mahovine i perifitonske alge postupno preuzele ulogu dominantnih sedrotvoraca. Na podvodnim podlogama identificirani su slojevi mikrokristalnog kalcita, a potvr\u0111ena je i ekspanzija perifitonskih zajednica na prethodno neza\u0161ti\u0107enim supstratima. Ovi podaci ukazuju na stabilan, ali ne\u0161to sporiji proces osedravanja u usporedbi sa Zonom 2.<\/p>\n Zona 1, koja obuhva\u0107a zasjenjene \u0161umske kaskade u najuzvodnijem dijelu slapi\u0161ta, pokazala je ni\u017ei intenzitet osedravanja zbog reducirane dostupnosti svjetlosti i slabijeg protoka vode. Sedrotvorne zajednice u tom podru\u010dju bile su prete\u017eno cijanobakterijske, s manjim udjelom mahovina, \u0161to je rezultiralo kompaktnijim i gu\u0161\u0107im naslagama sedre, ali s ni\u017eom stopom talo\u017eenja u odnosu na osun\u010dane barijere.<\/p>\n Zona 4, koja uklju\u010duje bo\u010dne \u0161umske pritoke, imala je manji intenzitet osedravanja. U tom podru\u010dju dominiraju cijanobakterijske naslage, s povremenom prisutno\u0161\u0107u perifitonskih algi, dok su mahovine bile rijetko prisutne. Sloj sedrenih naslaga je tanak i ne pokazuje znakove aktivne inkrustacije.<\/p>\n Najslabiji proces osedravanja zabilje\u017een je u Zoni 5, koritu rijeke nizvodno od slapi\u0161ta, gdje hidrolo\u0161ki uvjeti ne podr\u017eavaju stabilan razvoj sedrotvornih zajednica. U tom podru\u010dju uglavnom su prisutne zelene alge, dok su mahovine i cijanobakterije rijetke ili ih uop\u0107e nema. Sedra je tu prisutna uglavnom u obliku starih, erodiranih blokova uz rije\u010dne obale, uz prisutnost sedrenih terasa na granici vode i zraka.<\/p>\n Analiza sedrotvornih organizama pokazala je da mahovine imaju klju\u010dnu ulogu u stvaranju poroznih karbonatnih struktura u uvjetima jakog protoka vode i visoke osun\u010danosti, dok cijanobakterije dominiraju u hidrodinami\u010dki stabilnijim i zasjenjenijim podru\u010djima, gdje formiraju kompaktnije naslage sedre.<\/p>\n Ovi rezultati isti\u010du va\u017enost hidrolo\u0161kih i svjetlosnih \u010dimbenika u regulaciji sukcesije sedrotvornih zajednica, te potvr\u0111uju da je stabilnost sedrotvornog ekosustava na Skradinskom buku izravno povezana s o\u010duvanjem prirodnih uvjeta vodenog toka.<\/p>\n <\/p>\n [\/hr]<\/p>\n [en] The results showed that the tufa-forming processes are most intense in sunny areas with strong water flow, while they are significantly weaker in shaded and hydrodynamically more peaceful areas.<\/p>\n The greatest intensity of tufa formation was recorded in Zone 2, which includes sunlit barriers and waterfalls with strong water flows. The area is dominated by moss communities, primarily the species Palustriella commutata<\/em> and Didymodon tophaceus<\/em>, which provide optimal surfaces for calcite encrustation. In this zone, the growth rate of the tufa was the highest, and microscopic analysis showed the presence of extremely porous and layered carbonate deposits. A large role in tufa formation is also played by communities of sessile animals that inhabit moss communities \u2013 Bryozoa (bryophytes).<\/p>\n Zone 3, located in the downstream lake below the main waterfall (former swimming area), showed significant successional changes, with mosses and periphyton algae gradually taking over the role of dominant tufa-forming organisms. Microcrystalline calcite layers were identified on underwater substrates, and the expansion of periphyton communities on previously unprotected substrates was confirmed. These data indicate a stable, but somewhat slower process of tufa formation in comparison to Zone 2.<\/p>\n Zone 1, which encompasses shaded forest cascades in the most upstream part of the falls, showed a lower intensity of tufa formation due to reduced light availability and weaker water flow. The tufa-forming communities in the area were predominantly cyanobacterial, with a lower proportion of mosses, which resulted in more compact and dense tufa deposits, but with a lower deposition rate in comparison to sun-exposed barriers.<\/p>\n Zone 4, which includes lateral forest tributaries, had a lower intensity of tufa formation. This area is dominated by cyanobacterial deposits, with the occasional presence of periphyton algae, while mosses were rarely present. The layer of tufa deposits is thin and shows no signs of active encrustation.<\/p>\n The least active process of tufa formstion was recorded in Zone 5, the riverbed downstream of the waterfalls, where hydrological conditions do not support the stable development of tufa-forming communities. Green algae are mainly present in this area, while mosses and cyanobacteria are rare or completely absent. Tufa is present here mainly in the form of old, eroded blocks along the river banks, with the presence of tufa terraces at the border of water and air.<\/p>\n Analysis of tufa-forming organisms has shown that mosses play a key role in the creation of porous carbonate structures in conditions of strong water flow and high insolation, while cyanobacteria dominate in more hydrodynamically stable and shaded areas, where they form more compact tufa deposits.<\/p>\n These results highlight the importance of hydrological and light factors in regulating the succession of tufa-forming communities, and confirm that the stability of the tufa-forming ecosystem at Skradinski buk is directly related to the preservation of natural water flow conditions.<\/p>\n <\/p>\n <\/p> Investigation of the succession of tufa-forming communities in the area of the Skradinski buk was carried out during 2024, and encompassed five different zones where the intensity of tufa formation, the composition of tufa-forming organisms, and the ecological conditions that influence the dynamics of calcite (tufa crystals) deposition were analysed<\/p>","protected":false},"author":2,"featured_media":11480,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[44],"tags":[],"class_list":["post-11479","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research"],"_links":{"self":[{"href":"https:\/\/npkrka.hr\/en_us\/wp-json\/wp\/v2\/posts\/11479","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/npkrka.hr\/en_us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/npkrka.hr\/en_us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/npkrka.hr\/en_us\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/npkrka.hr\/en_us\/wp-json\/wp\/v2\/comments?post=11479"}],"version-history":[{"count":4,"href":"https:\/\/npkrka.hr\/en_us\/wp-json\/wp\/v2\/posts\/11479\/revisions"}],"predecessor-version":[{"id":14124,"href":"https:\/\/npkrka.hr\/en_us\/wp-json\/wp\/v2\/posts\/11479\/revisions\/14124"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/npkrka.hr\/en_us\/wp-json\/wp\/v2\/media\/11480"}],"wp:attachment":[{"href":"https:\/\/npkrka.hr\/en_us\/wp-json\/wp\/v2\/media?parent=11479"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/npkrka.hr\/en_us\/wp-json\/wp\/v2\/categories?post=11479"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/npkrka.hr\/en_us\/wp-json\/wp\/v2\/tags?post=11479"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![](\"https:\/\/npkrka.hr\/wp-content\/uploads\/detalj-zive-sedre-s-algama-i-vodenom-faunom.jpeg\")
![](\"https:\/\/npkrka.hr\/wp-content\/uploads\/GOPR0560-scaled.jpg\")
![](\"https:\/\/npkrka.hr\/wp-content\/uploads\/ziva-sedra-sacinjena-od-recentnih-mahovina-i-cijanobakterija-rod-Rivularia.jpeg\")
![](\"https:\/\/npkrka.hr\/wp-content\/uploads\/satelitska-karta.png\")
<\/div>
\nInvestigation of the succession of tufa-forming communities at Skradinski buk waterfall<\/strong>
\nInvestigation of the succession of tufa-forming communities in the area of the Skradinski buk was carried out during 2024, and encompassed five different zones where the intensity of tufa formation, the composition of tufa-forming organisms, and the ecological conditions that influence the dynamics of calcite (tufa crystals) deposition were analysed<\/strong><\/p>\n<\/div>
\n[\/en]<\/p>\n","protected":false},"excerpt":{"rendered":"