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  • A new proposal for zonation...
    Battelli, Claudio

    Acta Adriatica, 06/2016, Letnik: 57, Številka: 1
    Journal Article

    The zonation of midlittoral mainly based on macroalgal communities was studied at six sites of the Bay of Koper (Slovenian south-east part of the Gulf of Trieste) in spring (April) and autumn (November) 2010. The study, using the random selection method, involved different types of substrate (limestone, marl and sandstone). It was surveyed from the upper midlittoral to the infralittoral fringe (from the mean higher high water to the mean lower low water), the upper limit of the occurrence of the brown macroalgae Cystoseira compressa. The zonation of the midlittoral zone was divided into three horizons (upper, middle and lower) by biotic (leader species) and abiotic (sea level) criteria. By using multivariate technique the main dissimilarity was found between the macroalgal communities of the upper and lower horizon. The species that most contributed to this difference was Blidingia minima. The main differences in species composition in different substrates were found between limestone and marl. The species Chaetomorpha linum mainly characterized such differences, while the species Fucus virsoides was the main contributor to dissimilarity among the middle horizons on limestone and sandstone.Original Abstract: Podjela tj. zonacija mediolitoralnog pojasa pretezito se temelji na istrazivanjima zajednica makroalgi na sest postaja u zaljevu Koper (slovenski jugoistocni dio trscanskog zaljeva) provedenih u proljece (travanj) i jesen (studeni) 2010. godine. Studija provedena metodom slucajnog odabira, ukljucuje razlicite vrste podloga (vapnenac, lapor i pjescenjak). Uzorkovano je podrucje od gornjeg mediolitoralnog pojasa do ruba infralitorala (izmedu srednje gornje razine plime do srednje donje razine oseke), te gornje granice prisustva smede alge cystoseira Compressa. Zonacijom je mediolitoral podijeljen u tri sloja (visi, srednji i nizi) prema biotickim (vodece vrste) i abiotickim kriterijima (razina mora). Primjenom multivarijatne tehnike glavna razlicitost je ustanovljena izmedu zajednica makroalgi gornjeg i donjeg sloja. Vrsta koja je najvise doprinijela ovakvoj razlicitosti je Blidingia minima.Glavne razlike u sastavu vrsta u razlicitim podlogama su pronadene izmedu vapnenca i lapora. Vrsta Chaetomorpha linum uglavnom karakterizira takve razlike, dok je vrsta Fucus virsoides bila glavni pridonositelj razlicitosti medu srednjim slojem na vapnencu i pjescenjaku.