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Analysis of zooplankton assemblages from man-made ditches in relation to current velocity Cover

Analysis of zooplankton assemblages from man-made ditches in relation to current velocity

Oceanological and Hydrobiological Studies
Volume 46 (2017): Issue 2 (June 2017)
By: Robert Czerniawski and  Łukasz Sługocki  
Open Access
|May 2017

Figures & Tables

Figure 1

Study area – Drawa catchment area. The examined ditches are shown in the rectangular areas.
Study area – Drawa catchment area. The examined ditches are shown in the rectangular areas.

Figure 2

Mean + SD values of physicochemical and hydrological variables for the examined ditches divided into six groups according to the current velocity values: 1) <0.05 m s-1, 2) <0.10 m s-1, 3) <0.15 m s-1, 4) <0.20 m s-1, 5) <0.25 m s-1 and 6) >0.25 m s-1. Different letters indicate significant differences p<0.05 in values of variables between groups of ditches.
Mean + SD values of physicochemical and hydrological variables for the examined ditches divided into six groups according to the current velocity values: 1) <0.05 m s-1, 2) <0.10 m s-1, 3) <0.15 m s-1, 4) <0.20 m s-1, 5) <0.25 m s-1 and 6) >0.25 m s-1. Different letters indicate significant differences p<0.05 in values of variables between groups of ditches.

Figure 3

Mean + SD values of zooplankton abundance (ind. l-1), Shannon’s index and the number of species for the examined ditches divided into six groups according to the current velocity values: 1) <0.05 m s-1, 2) <0.10 m s-1, 3) <0.15 m s-1, 4) <0.20 m s-1, 5) <0.25 m s-1 and 6) >0.25 m s-1. Different letters indicate significant differences p<0.05 in values of variables between groups of ditches.
Mean + SD values of zooplankton abundance (ind. l-1), Shannon’s index and the number of species for the examined ditches divided into six groups according to the current velocity values: 1) <0.05 m s-1, 2) <0.10 m s-1, 3) <0.15 m s-1, 4) <0.20 m s-1, 5) <0.25 m s-1 and 6) >0.25 m s-1. Different letters indicate significant differences p<0.05 in values of variables between groups of ditches.

Figure 4

Relationship between values for zooplankton abundance (ind. l-1), Shannon’s index, the number of species vs. current velocity (m s-1)
Relationship between values for zooplankton abundance (ind. l-1), Shannon’s index, the number of species vs. current velocity (m s-1)

Figure 5

Rarefaction curves of Shannon’s index of zooplankton for the examined ditches divided into six groups according to the current velocity values: 1) <0.05 m s-1, 2) <0.10 m s-1, 3) <0.15 m s-1, 4) <0.20 m s-1, 5) <0.25 m s-1 and 6) >0.25 m s-1
Rarefaction curves of Shannon’s index of zooplankton for the examined ditches divided into six groups according to the current velocity values: 1) <0.05 m s-1, 2) <0.10 m s-1, 3) <0.15 m s-1, 4) <0.20 m s-1, 5) <0.25 m s-1 and 6) >0.25 m s-1

Figure 6

nMDS ordination for the total zooplankton abundance at sites in the natural stream (recipient) and ditches (tributary) with different values of current velocity. The grouping in nMDS ordination was based on the Bray-Curtis distances. For symbols, refer to Figure 1.
nMDS ordination for the total zooplankton abundance at sites in the natural stream (recipient) and ditches (tributary) with different values of current velocity. The grouping in nMDS ordination was based on the Bray-Curtis distances. For symbols, refer to Figure 1.

Figure 7

Zooplankton abundance along environmental factors: CCA constrained ordination of samples and taxa from sites with different current velocity in ditches with the forward selection procedure of environmental variables. Numbers indicate the sites. Environmental variables: Veloc – current velocity; Disch – discharge; Temp. – temperature; Cond. – conductivity; Oxy – dissolved oxygen; Chlor a – chlorophyll a. For symbols, refer to Figure 1.
Zooplankton abundance along environmental factors: CCA constrained ordination of samples and taxa from sites with different current velocity in ditches with the forward selection procedure of environmental variables. Numbers indicate the sites. Environmental variables: Veloc – current velocity; Disch – discharge; Temp. – temperature; Cond. – conductivity; Oxy – dissolved oxygen; Chlor a – chlorophyll a. For symbols, refer to Figure 1.

Significant differences in mean values ± SD of zooplankton abundance (ind_ l-1), Shannon’s index and the number of species for the ditches divided into two groups according to the current velocity values: <0_10 m s-1 vs_ >0_10 m s-1_ ** p<0_01, *** p<0_001

Taxa<0.1 m s-1; n = 50p>0.1 m s-1; n = 30
Bdelloidea5.01 ± 4.46***1.03 ± 0.90
Keratella sp.6.99 ± 21.42**1.96 ± 2.25
Polyarthra sp.1.28 ± 3.25***0.94 ± 0.84
Daphnidae7.79 ± 16.00***0.05 ± 0.08
Total zooplankton41.29 ± 33.71***14.31 ± 10.39
Shannon-Wiener index1.46 ± 0.40***1.87 ± 0.37
Number of species7.5 ± 3.5**9.9 ± 3.5

Results of Canonical Correspondence Analysis of zooplankton abundance with the forward selection procedure of environmental variables_ Order – Order of integration of variables for analysis

OrderVariableVarianceVariance explained (%)Permutation test
Fp
1Discharge0.2026.02.720.005
2Conductivity0.1013.05.320.005
3Velocity0.1114.32.770.005
4Dissolved oxygen0.0911.73.690.005
5Width0.0810.42.720.005
6Chlorophyll a0.067.802.350.005
7Temperature0.056.501.910.045
8Depth0.045.201.940.055
9pH0.045.201.720.075

Jaccard’s similarity index values between sites at natural streams and two groups of ditches according to their current velocity value: 1) <0_1 m s-1 and 2) >0_1 m s-1

< 0.1 m s-1> 0.1 m s-1
N2 vs. 1142.1N4 vs. 155.6
N5 vs. 2836.4N3 vs. 766.7
N7 vs. 3321.4N1 vs. 571.4
N16 vs. 4657.1N6 vs. 3227.8
N17 vs. 5158.3N8 vs. 5946.2
N10 vs. 5433.3N9 vs. 6345.5
  N11 vs. 6164.3
  N12 vs. 7037.5
  N13 vs. 7566.7
  N14 vs. 7645.5
  N15 vs. 7746.7
Mean41.5NS p>0.0552.1
DOI: https://doi.org/10.1515/ohs-2017-0020 | Journal eISSN: 1897-3191 | Journal ISSN: 1730-413X
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Language: English
Page range: 199 - 211
Submitted on: Jun 8, 2016
Accepted on: Aug 29, 2016
Published on: May 31, 2017
Published by: University of Gdańsk
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year
Keywords:
stream ecology,
Rotifera,
Copepoda,
Cladocera,
biodiversity,
land reclamation
Related subjects:
Chemistry,
Chemistry, other,
Geosciences,
Geosciences, other,
Life sciences,
Life sciences, other

© 2017 Robert Czerniawski, Łukasz Sługocki, published by University of Gdańsk
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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