20.500.12556/RUL-144706 Struktura in sukcesija združbe morskih nevretenčarjev obrasti in njena filtracijska učinkovitost Structure and succession of marine invertebrate fouling community and its filtration efficiency Obrast je združba organizmov, ki obrašča podvodne strukture človeškega izvora in je ena od oblik morske epibentoške združbe trdnega dna. Njen razvoj skozi čas zaznamujeta sezonska in sukcesijska dinamika zaraščanja. Ena pomembnejših ekosistemskih storitev združbe obrasti je njena filtracijska učinkovitost (FU) in z njo povezano izboljšanje kvalitete morske vode. Namen raziskave je bil opisati časovno dinamiko obrasti v slovenskem priobalnem morju, eksperimentalno oceniti hitrosti precejanja (CR) za nekatere pogoste filtratorje v tej združbi in oceniti celotno FU obrasti na manjših podvodnih strukturah. Na lokaciji Morgan pri Piranu smo v mesečnih razmakih v obdobju enega leta postavili nosilce s ploščicami iz terakote in sprva mesečno ter nato redkeje združbo na ploščicah analizirali z laboratorijskimi in fotografskimi metodami. Poskuse za oceno CR smo izvedli z merjenjem upada števila hranljivih delcev v suspenziji pri hranjenju kozolnjakov vrste Styela plicata in mahovnjakov vrste Schizoporella errata ter Bugula neritina v kontroliranih laboratorijskih razmerah. FU združbe obrasti smo ocenili na biofiltrih, obraščenih valjih iz plastične mreže. Na naseljevanje pritrjenih nevretenčarjev je vplival čas postavitve struktur, pomembno vlogo pa je imela temperatura morja. Vrstno najbolj pestre in pogoste skupine nevretenčarjev so bili mahovnjaki (Bryozoa), črvi cevkarji (Serpulidae) in školjke (Bivalvia). Pokazali smo, da je S. errata, zaradi svoje abundance in visokih CR, pomemben filtrator v slovenskem priobalnem morju. Izračunali smo, da lahko obrasli biofiltri prefiltrirajo velike količine morske vode, podobne strukture pa bi lahko ob strateški namestitvi blažile probleme povezane z evtrofikacijo na obremenjenih delih slovenske obale. The fouling community is a community of organisms that cover underwater structures of anthropogenic origin, and is a form of marine hard bottom epibenthic community. Its temporal patterns are determined by its seasonal and successional dynamics. One of the most important ecosystem services provided by the fouling community is its filtration capacity (FE), which improves the quality of seawater. The aim of this research was to describe the temporal patterns of the fouling community in the Slovenian coastal sea, to estimate experimentally the clearance rates (CR) for some common filter feeders of this community and to estimate the overall FE of the fouling community on small underwater structures. At the Morgan locality near Piran, structures carrying terracotta plates were placed monthly over the course of a year, and the assemblage on the plates was analysed using laboratory and photographic methods, first monthly and then at less frequent intervals. Experiments to evaluate CR were conducted with the ascidian Styela plicata and two bryozoan species, Schizoporella errata and Bugula neritina, measuring the decrease in the number of particles in suspension when the animals were fed under controlled laboratory conditions. The FE of the fouling community was evaluated in the case of biofilters, overgrown cylinders made of plastic mesh. Colonization of sessile invertebrates was influenced by the timing of placement of the structures, with sea temperature playing an important role. The most diverse and abundant invertebrate groups were bryozoans (Bryozoa), tubeworms (Serpulidae), and bivalves (Bivalvia). We have shown, that, due to its abundance and high CR, S. errata is an important filter feeder in the Slovenian coastal sea. We have as well demonstrated that fouled biofilters filter large amounts of seawater and we anticipate that, if strategically placed, similar structures could alleviate problems associated with eutrophication in degraded areas of the Slovenian coast. Združba obrasti bentoški nevretenčarji filtracijska učinkovitost Schizoporella errata Bugula neritina Styela plicata biofiltri Fouling community Benthic inverterbrates Filtration efficiency Schizoporella errata Bugula neritina Styela plicata Biofilters true false false [A. Fortič] Slovenski jezik Angleški jezik Doktorsko delo/naloga 2023-03-09 07:15:02 2023-03-09 07:15:14 2023-03-23 14:40:16 0000-00-00 00:00:00 2023 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 574 217536 146357507 32170.pdf 32170.pdf 1 3DF95C217B7AF6BD094F050F0BADA02C 075e612a31b137f4ae4db9c9207a03689bbbe9d4d0d9e854c1a08e454549f6cc b8229262-be41-11ed-a314-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=167174 Biotehniška fakulteta 0 0 0