Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Photosynthetic characteristics of the benthic diatom species Nitzschia frustulum (Kützing) Grunow isolated from a soda pan along temperature-, sulfate- and chloride gradients
Ist Teil von
Aquatic ecology, 2015-12, Vol.49 (4), p.401-416
Ort / Verlag
Dordrecht: Springer Netherlands
Erscheinungsjahr
2015
Link zum Volltext
Quelle
SpringerLink (Online service)
Beschreibungen/Notizen
The Carpathian Basin hosts a number of small, shallow, saline, alkaline ponds. As being endorheic basins, they are highly threatened by the climate change and response of biota to changing climate has been largely unexplored. We investigated the effects of salinity changes on the photosynthetic activity of
Nitzschia frustulum,
which is one of the main dominant taxa of the saline lakes in the Fertő-Hanság Region of the Carpathian Basin. The photosynthetic activity of the species was measured along temperature (5, 10, 15, 20, 25, 30, 35, 40 °C), light (0–8–35–70–110–200–400–800–1200 µmol m
−2
s
−1
), SO
4
2−
(0–50–600–1200–2400–3600–4800 mg L
−1
) and Cl
−
(0–36–437.5–875–1750–3500–5250 mg L
−1
) gradients under laboratory conditions in photosynthetron. The conductivity optimal of
N. frustulum
was around 5600 µS cm
−1
with wide salinity tolerance. The species preferred the HCO
3
−
–SO
4
2−
-type waters since its photosynthetic activity (3.62 mg C mg Chl-
a
−1
h
−1
) was more than twice higher than in HCO
3
−
–Cl
−
-type media. Its photosynthesis saturated at very low-light intensity, and photoinhibition was not observed during the experiments. The maximal photosynthesis was measured at 28–29 °C. However, above 30 °C, the decline of photosynthesis of
N. frustulum
can be forecasted.