Otwarty dostęp

Ecological preferences of freshwater Ulva flexuosa (Ulvales; Ulvophyceae): development of macroalgal mats in a Tulce fishpond (Wielkopolska Region, Poland)

Andrzej S. Rybak
Andrzej S. Rybak
   | 10 mar 2016
Oceanological and Hydrobiological Studies's Cover Image
O artykule
Poprzedni artykuł
Następny artykuł
Zacytuj
Article Category: Original research paper
Data publikacji: 10 mar 2016
Zakres stron: 100 - 111
Otrzymano: 26 mar 2015
Przyjęty: 23 lip 2015
DOI: https://doi.org/10.1515/ohs-2016-0010
Słowa kluczowe
© Faculty of Oceanography and Geography, University of Gdañsk, Poland. All rights reserved.
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

The PCA diagram for individual physicochemical factors of water from Ulva flexuosa site
The PCA diagram for individual physicochemical factors of water from Ulva flexuosa site

Figure 2

Thalli and cells of limnic Ulva flexuosa. A – submerged thalli; B – free-floating thalli; C, D and E – tube-like thalli from herbarium sheets; F – cells with 2-3 pyrenoids, rarely single, G – cells with cup-shaped chloroplasts (3D view from confocal microscope)
Thalli and cells of limnic Ulva flexuosa. A – submerged thalli; B – free-floating thalli; C, D and E – tube-like thalli from herbarium sheets; F – cells with 2-3 pyrenoids, rarely single, G – cells with cup-shaped chloroplasts (3D view from confocal microscope)

Figure 3

The succession dynamics of a macroalgal community with limnic Ulva flexuosa
The succession dynamics of a macroalgal community with limnic Ulva flexuosa

Values of Pearson’s linear correlation coefficient and the coefficient of determination (r2) for morphometric parameters of U. flexuosa thalli and macroalgal mats with physicochemical factors

pH Depth N-NH4 + P-PO4- O2 Temperature
Average length of a thallus -0.45ns 0.90

P < 0.001, ns − not significant, coefficient of determination − r2 in brackets

 -0.45 ns 0.10 ns 0.68

P < 0.05

 -0.38 ns
- (0.82) - - (0.45) -
Average width of a thallus -0.18 ns -0.03 ns -0.23 ns -0.40 ns -0.08 ns -0.63

P < 0.05
- - - - - (0.39)
Surface of mats -0.73

P < 0.01

 0.43 ns -0.62

P < 0.05

 -0.75

P < 0.01

 -0.20 ns -0.47 ns
(0.54) - (0.39) (0.56) - -
Density of thalli per m-2 of mats -0.48 ns 0.89

P < 0.001, ns − not significant, coefficient of determination − r2 in brackets

 -0.53 ns 0.06 ns 0.82

P < 0.01

 -0.42 ns
- (0.80) - - (0.67) -
Percentage of branched thalli per m2 of mats 0.54 ns 0.10 ns 0.59

P < 0.05

 0.59

P < 0.05

 0.14 ns 0.16 ns
- - (0.35) (0.35) - -
Percentage of unbranched thalli per m2 of mats -0.76

P < 0.01

 0.31 ns -0.46 ns -0.67

P < 0.05

 -0.15 ns -0.31 ns
(0.58) - - (0.45) - -
Percentage of young thalli per m2 of mats 0.60

P < 0.05

 -0.48 ns 0.70

P < 0.01

 0.30 ns -0.31 ns 0.52 ns
(0.36) - (0.50) - - -
Percentage of mature thalli per m2 of mats -0.82

P < 0.001, ns − not significant, coefficient of determination − r2 in brackets

 0.43 ns -0.84

P < 0.001, ns − not significant, coefficient of determination − r2 in brackets

 -0.59

P < 0.05

 0.05 ns -0.34 ns
(0.68) - (0.71) (0.35) - -
Percentage of submerged thalli per m2 of mats -0.66

P < 0.05

 0.89

P < 0.001, ns − not significant, coefficient of determination − r2 in brackets

 -0.58

P < 0.05

 -0.14 ns 0.50 ns -0.43 ns
(0.44) (0.80) (0.33) - - -
Percentage of free-floating thalli per m2 of mats 0.73

P < 0.01

 -0.86

P < 0.001, ns − not significant, coefficient of determination − r2 in brackets

 0.70

P < 0.05

 0.22 ns -0.48 ns 0.40 ns
(0.54) (0.74) (0.49) - - -

Results of the Mann-Whitney U test of the difference in mean values of physicochemical factors under and outside of Ulva mats (n = 12). Results where P < 0.05 are statistically significant and given in bold.

Parameters Unit Mann-Whitney U test Statistical significance Sign
pH - 66.0 P = 0.75 UMM OMM >
Conductivity µS cm-1 31.0 P = 0.01 >
N-NH4+ mg l-1 64.0 P = 0.66 >
N-NO3- 32.5 P = 0.02 <
P-PO43- 49.0 P = 0.19 >
Fetotal 63.0 P = 0.62 >
NaCl 67.5 P = 0.85 >
Cl- 67.5 P = 0.81 >

Comparison of anatomical features of Ulva flexuosa (n =30) and average values of morphometric features of Ulva mats (n =12).

Features Units Mean Min. Max SD

– standard deviation
Length of thalli cm 20.00 4.2 66.40 0.53
Width of thalli 0.59 0.15 1.15 0.14
Length of cells µm 11.15 8.10 15.5 1.99
Width of cells 8.09 4.96 10.78 1.39
Number of pyrenoids - 2 1 3 0.75
Perimeter of pyrenoids µm 3.19 2.40 3.90 0.38
Surface of mats m2 12.83 1.0 30.0 11.17
Density of thalli per m2 of mats m-2 75.92 10.0 250.0 66.16
Percentage of branched thalli per m2 of mats % 49.58 10.0 90.0 26.67
Percentage of unbranched thalli per m2 of mats 22.92 5.0 75.0 24.07
Percentage of young thalli per m2 of mats 37.50 5.0 95.0 32.72
Percentage of mature thalli per m2 of mats 55.92 1.0 95.0 31.74
Percentage of submerged thalli per m2 of mats 35.25 0 95.0 38.78
Percentage of free-floating thalli per m2 of mats 59.58 10.0 100 32.71

Average values of physicochemical factors of water for the examined site of Ulva flexuosa (n =12)

Parameter Units Mean Min. Max SD

– standard deviation
Temperature ºC 17.3 14.10 22.0 2.16
Depth of water m 2.4 2.0 3.2 0.37
pH - 7.2 6.03 8.4 1.37
Conductivity μS cm-1 1044.7 655.0 1421.0 196.38
O2 mg O2 l-1 8.0 4.2 3.4 8.07
N-NH4 + mg N l-1 1.2 0.18 4.0 1.26
N-NO3 - mg N l-1 0.2 0.06 0.4 0.09
P-PO4 3- mg PO4 l-1 0.5 0.12 0.8 0.25
Total Fe mg Fe l-1 0.2 0.06 0.3 0.07
NaCl mg NaCl l-1 91.1 61.05 143.6 25.27
Cl- mg Cl l-1 55.2 37.0 87.0 15.32
eISSN:
1897-3191
Język:
Angielski
Częstotliwość wydawania:
4 razy w roku
Dziedziny czasopisma:
Chemistry, other, Geosciences, Life Sciences
Kanał RSS czasopisma