Perifitonska združba kremenastih alg v izbranih kalih alpskega območja

Novak, Katarina (avtor), Zelnik, Igor (mentor)

Glavni namen naloge je bil raziskati odziv združb kremenastih alg na različne okoljske dejavnike. Vzorčenja so potekala v 12 kalih na območju alpskega sveta v času viška pašne sezone (avgust 2016). Ker je bil vsem kalom od substrata skupen le agrilal, smo vzorčili epipelon. Na vsaki lokaciji smo ocenili hidromorfološke značilnosti, z multimetrom izmerili fizikalne in kemijske značilnosti ter vzeli vzorce za nadaljnje kemijske analize vode in pripravo preparatov. Določili smo 105 taksonov kremenastih alg, ki pripadajo 32 rodom. Najpogostejše vrste so bile Gomphonema parvulum, Navicula cryptocephala, Sellaphora pupula in Achnanthidium pyrenaicum, ki so bile prisotne v večini kalov. Kal z najnižjo vrstno pestrostjo (KRV1) je hkrati tudi na najvišji nadmorski višini, kal, kal z najvišjo vrstno pestrostjo (JEL1) pa leži najnižje. Vzorci kalov so bili zelo heterogeni, zato rezultati niso pokazali veliko statistično značilnih korelacij. Ugotovili smo pozitivno korelacijo med vrstno pestrostjo kremenastih alg in nasičenostjo vode s kisikom ter negativno korelacijo med vrstno pestrostjo kremenastih alg in koncentracijo amonijevega dušika. Koncentracija nitratov in amonija pojasni skoraj 20 % celotne variabilnosti združbe kremenastih alg v kalih. Proti pričakovanjem so rezultati pokazali negativno korelacijo med združbo makroinvertebratov in kremenastimi algami, verjetno zaradi različnega odziva na okoljske dejavnike.

• Jezik: Slovenski jezik
• Ključne besede: združba kremenastih alg, kali, alpski svet, okoljski dejavniki
• Vrsta gradiva: Magistrsko delo/naloga
• Organizacija: BF - Biotehniška fakulteta
• Leto izida: 2019
• PID: 20.500.12556/RUL-107954
• COBISS.SI-ID: 5106255
• Datum objave v RUL: 10.06.2019

NOVAK, Katarina, 2019, Perifitonska združba kremenastih alg v izbranih kalih alpskega območja [na spletu]. Magistrsko delo. [Dostopano 4 april 2025]. Pridobljeno s: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=slv&id=107954

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Periphytic diatom communities in karst ponds in alpine region in Slovenia

Izvleček

The main purpose of this thesis was to investigate the response of diatom communities to various environmental factors. Samples were taken in 12 karst ponds in alpine region during the high season of pasture (August 2016). Because agrilal was present in all karst ponds, we have decided to sample epipelon. At each location, we evaluated the hydro morphological characteristics, measured the physical and chemical characteristics with the multimeter, and took samples for further chemical analysis of water and composition preparation. We determined 105 taxa of diatoms, which belong to 32 genera. The most common species were Gomphonema parvulum, Navicula cryptocephala, Sellaphora pupula in Achnanthidium pyrenaicum, which were present in most karst ponds. Karst pond with the lowest species diversity (KRV1) is also at the highest altitude, while the karst pond with highest variability (JEL1) is at the lowest altitude. The samples of karst ponds were very heterogeneous, therefore the results did not show statistically significant correlations. We have established a positive correlation between the species variety of diatoms and the saturation of water with oxygen and a negative correlation between the species variety of diatoms and the concentration of ammonium nitrogen. The concentration of nitrates and ammonia clarifies almost 20% of the total variability of the diatoms communities. Against all expectations, the results showed a negative correlation between macroinvertebrate and diatom communities, probably because of the different response to environmental factors.

• Ključne besede: diatoms communities, karst ponds, alpine region, enviromental factors