Hidrológiai Közlöny, 2015 (95. évfolyam)

2015 / 5-6. különszám - LVI. Hidrobiológus Napok előadásai

3. áblázat: Azschia aurariae fotoszintetikus paraméterei [* mértékegység: pg C gg'1 Chl-a h'1 (gmol m'2 s'1)'1]

41

T(°C)

Ik

(pmol itCs'1)

a*

P max

(mg C mg Chl-a'1 h'1)

T (°C)

Ik

(pmol m'2 s'1)

a*

P max

(mg C mg Chl-a'1 h1)

u

m

Cl

7,48

0,0021

0,0157

u

0

ín

CM

Cl

296,31

0,0003

0,6043

C2

211,33

0,0003

0,0634

C2

53,45

0,0051

0,2726

C3

63,91

0,0054

0,3451

C3

207,24

0,0021

0,4352

C4

38,54

0,0158

0,6089

C4

293,15

0,0062

1,8175

C5

39,86

0,0087

0,3468

C5

265,31

0,0052

1,3796

Cl

122,66

0,0003

0,0368

Cl

251,73

0,0015

0,3776

._.

C2

46,79

0,0014

0,0655

C2

232

0,0021

0,4872

0

o

C3

57,12

0,0016

0,0914

o

o

C3

232,24

0,0088

2,0437

H

C4

116,35

0,0037

0,4305

m

C4

425,81

0,0074

3,151

C5

75,29

0,0035

0,2635

C5

474,39

0,0038

1,8027

Cl

183,5

0,0006

0,1101

Cl

182,32

0,005

0,9116

C2

90,37

0,0016

0,1446

C2

238,53

0,0036

0,8587

0

C3

16,6

0,007

0,1162

o

in"

C3

197,03

0,0075

1,4777

iH

C4

96,81

0,0064

0,6196

m

C4

385,2

0,01

3,852

C5

559,71

0,0007

0,3918

C5

477,67

0,0072

3,4392

Cl

31,93

0,0029

0,0926

Cl

49,56

0,0041

0,2032

C2

158,25

0,0016

0,2532

y

C2

180,92

0,0024

0,4342

o

C3

109,25

0,0034

0,3713

o"

C3

186,92

0,0033

0,6169

CM

C4

238,46

0,0048

1,1446

C4

86,31

0,0127

1,0962

C5

195,03

0,0038

0,7411

C5

613,37

0,0016

0,9814

Photosynthetic characteristic of Nitzschia aurariae along sulfate gradient

D., Lázár, E., Lengyel, C., Stenger-Kovács

The global climate change has strong effect on soda lakes and on their biota due to the fact that the originally extreme values of the environmental factors become more extreme. Water temperature drastically increases during summer, the lake bed dries sooner, thus concentration or dilution processes are faster due to particular extreme meteorological events. We studied the ecophysiological response of a dominant species of Hungarian soda pans, Nitzchia aurariae along sulphate gradient. In order to get information about the physiological optimum and tolerance of the species, we measured the photosynthetic activity in a photosynthetron in laboratory. We carried out the experiment between 5 and 40°C, using six sulphate concentrations (0,600, 1200,2400 and 4800, 7200 mg L'1) and nine light intensities (0, 8, 35, 70, 110,200, 400, 800,1200 pmol m'2 s'1). Our study confirms former studies that Nitzschia aurariae favors water bodies with high sulphate ion concentrations. We measured the most intensive photosynthetic activity at high conductivity (7472 pS cm'1) and sulphate concentration (5336 mg T1). Similarly to other Nitzschia species (i.e. N. palea, N. frustulum, N. closterium) N. aurariea prefers warm waters, its temperature optimum was around 32 °C in our experiment. According to our results, Nitzschia aurariae can successfully tolerate the increasing conductivity, sulphate concentration and temperature caused by the global climate change having competitive advantage over other species.

The study was supported by OTKA K81599 and TÁMOP -4.2.2.A-1 l/l/KONV-2012-0064.