Sensitivity and potential for acclimatization to high temperatures during stimulated summer heat waves in bladderwrack, F. Vesiculosus

Natalia Kristina Andersen

Studenteropgave: Speciale

Abstrakt

Bladderwrack is a key species macroalgae, with wide geographical distribution. Decrease or complete elimination of Fucus vesiculous would result as niche lost for many marine organisms. Numerous publication suggested that with climate changes and higher temperature of the water, bladderwrack might have a problem with adaptation to new conditions. However recent studies assumed that algae start to suffer from the temperature exposure to 28ºC or even 30 degrees.36 To unsolved answer whether Fucus vesiculous can survive and continue maintaining all the physiological function, the experiment upon 3 different heatwaves was made. The macroalgae were exposed to 19ºC, 23ºC, and 27ºC degree, where control sample was assessed on 15ºC. There was no mortality observed during the whole experiment. Furthermore, growth rate, pigments content and photosynthetic efficiency decreased over the time. There was a significant interaction effect between time and temperature resulting as an increase of IC during the T2 (p<0.001) and T3 (p<0.005). The algae exposed to the highest temperature (27ºC) increased around 106% (p<0.002) in comparison to the control Box (15ºC), Moreover when compared to19ºC the IC increased 139% (p<0.001) for 27ºC. Although the temperature was not the only stressing factor, unhappily bladderwrack might undergo starvation and irradiation exposure. Interestingly the reproduction rate was not affected by the experiment. Moreover, Fucus Vesiculous seems to cooperate with 27ºC. The decreasing dark respiration rate from the PI measurement can lead to the indication of adaptation trial. Furthermore, there was an experiment upon genetic response to the heat wave stimulation, sadly with not sufficient enough results. Therefore it is impossible to conclude correlation between genetic protective mechanism against higher temperatures. However possible genetic product, in my case heat shock proteins can be found in the results section. Based upon obtained results, I cannot agree with a statement from Graiff et al 2015 that temperature of 27ºC degree might lead to the extinction of Fucus Vesiculous. Furthermore under negative effect generally caused by the experiment, macroalgae possess a strong ability to survive under multiple stressful conditions, which is a strong indication of adaptation possibilities.

UddannelserMolekylærbiologi, (Bachelor/kandidatuddannelse) Bachelor el. kandidatMiljøbiologi, (Bachelor/kandidatuddannelse) Bachelor el. kandidat
SprogEngelsk
Udgivelsesdato15 jun. 2018
Antal sider200
VejledereHans Ramløv & Morten Foldager Pedersen