Algni vijenci kao biološki indikatori srednje razine mora

undergraduate thesis

• Title (english): Algal rims as biological mean sea level indicators
• Author: Karolina Pipinić
• Mentor: Tatjana Bakran-Petricioli (mentor)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2021-09-22, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Lithophyllum byssoides (Lamarck, 1900) koraligena je mediolitoralna alga, koja se
javlja u pojasu plime i oseke Sredozemnog mora i SI Atlantika. U povoljnim uvjetima alga
gradi vijence malo iznad srednje razine mora, a s obzirom na izrazito uski vertikalni raspon,
takvi su vijenci vjerni pokazatelji, bioindikatori, promjene srednje razine mora. Algni vijenci
najizraženiji su na sjenovitim i strmim, sjevernim obalama pod utjecajem valova i vjetrova.
Najveći rast alge zabilježen je tijekom hladnijeg dijela godine i tijekom dužih perioda
relativne stabilnosti morske razine. Algni vijenci su veoma otporni na eroziju pa izdignuti ili
morem preplavljeni analozi recentnih vijenaca ukazuju na izdizanje ili spuštanje kopna, a
formirani vijenci na dulje razdoblje stabilnosti. Radiokarbonskim datiranjem algnih
biokonstrukcija moguće je dobiti podatke o položaju srednje razine mora u prošlosti s
točnošću od ± 10 cm. Alga L. byssoides inženjer je ekosustava pa su njene biokonstrukcije
osnova jednoj od značajnijih zajednica u Mediteranu. Globalnim zagrijavanjem, kako kopna,
tako i mora, ova je zajednica ugrožena. Posljednjih godina pridaje se velika pažnja
određivanju porasta razine mora kroz datiranje algnih vijenaca, no bilo bi potrebno uložiti
jednako truda u monitoring njihovog stanja i zaštitu. Istraživanja su pokazala da su
biokonstrukcije L. byssoides podložne efektu rezervoara, te da promjene u izotopnom sastavu
algnih vijenaca koreliraju s promjenom klime. Vijenci se tako mogu koristiti za bolje
razumijevanje klimatske varijabilnosti paleoklime, ali i za bolje razumijevanje trenutnih i
budućih klimatskih promjena.

Abstract (english)

Lithophyllum byssoides (Lamarck, 1900) (Rhodophyta, Corallinales) is a mid-littoral
alga, occurring in the tidal zone of the Mediterranean and the NE Atlantic. In favourable
conditions, this alga constructs solid rims just above mean sea level, and given the extremely
narrow vertical range, such bioconstructions are faithful bioindicators of mean sea level
change and relative sea level stability. Algal rims are most pronounced on exposed, steep,
north facing shores influenced by strong surf. The highest growth of the algal rim is recorded
during the colder part of the year and during longer periods of relative sea level stability.
Algal rims are resistant to erosion due to the calcified inner part of the rim, so raised or
submerged analogues of recent rims indicate the submergence or emergence. Radiocarbon
dating of algal bioconstructions provide precise data about former mean sea level with an
accuracy of ± 10 cm. L. byssoides is among one of the most important ecosystem engineers in
the Mediterranean. Community which its bioconstruction supports is endangered by climate
change, and ocean warming. In recent years, great attention has been given to obtain data
about former mean sea level by dating of the rims, but it is necessary to put the same effort
into its monitoring and protection. Research has shown that bioconstructions of L. byssoides
have reservoir effect, and that changes in algal rim isotope content correlate with climate
change. Rims can thus be used for a better understanding of climatic variability of the
paleoclimate, but also for a better understanding of current and future climate change.

• Keywords: algni vijenci; bioindikatori; srednja razina mora (MSL); Lithophyllum byssoides; biokonstrukcije
• Keywords (english): algal rims; bioindicators; mean sea level (MSL); Lithophyllum byssoides; bioconstructions
• Language: croatian
• URN:NBN: urn:nbn:hr:217:505395
• Study programme: Title: Environmental Sciences; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) struke znanosti o okolišu (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) struke znanosti o okolišu)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-09-27 11:27:44