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Use of rotifer trophic state indices to show the effect of hydrobionts and nutrients on water trophic status in mesocosms

Jolanta Ejsmont-Karabin
Jolanta Ejsmont-Karabin
, 
Irina Feniova
Irina Feniova
, 
Iwona Kostrzewska-Szlakowska
Iwona Kostrzewska-Szlakowska
, 
Marek Rzepecki
Marek Rzepecki
, 
Varos G. Petrosyan
Varos G. Petrosyan
 oraz 
Andrew R. Dzialowski
Andrew R. Dzialowski
   | 18 cze 2020
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Article Category: Research Article
Data publikacji: 18 cze 2020
Zakres stron: 123 - 131
Otrzymano: 19 sie 2019
Przyjęty: 04 lis 2019
DOI: https://doi.org/10.1515/ohs-2020-0011
© 2020 Faculty of Oceanography and Geography, University of Gdańsk, Poland
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

Changes in the mean values of the trophic state index in six experimental treatments without nutrients and six treatments with added nutrients
Changes in the mean values of the trophic state index in six experimental treatments without nutrients and six treatments with added nutrients

Results of the effects of treatment, interaction of treatments × time and mesocosms on trophic state indices measured 4 times during the experiment. Mesocosms were treated as a random-nested factor in GLM. F is Fisher’s test; DF1, DF2 – degrees of freedom of the F-ratio; p*– p value for the factor effects. Significant values are given in bold.

Source DF1/DF2 F-ratio p*-value R-Squared statistic (R2) of GLM, Durbin-Watson statistic (DWs; p** value)
Loge[TSIN]
A – Treatments 11/72 17.33 << 0.0001 R2 = 88.4 (%); DWs = 2.2 (p** = 0.88)
B(A) – Mesocosms (Treatments) 24/72 1.94 0.017
C– Time 3/ 72 11.79 << 0.001
A × C– Treatments × Time 33/72 2.98 0.0001
Loge[TSIB]
A – Treatments 11/72 17.24 << 0.0001 R2 = 86.3 (%) DWs = 2.2 p** = 0.86)
B(A) – Mesocosms (Treatments) 24/72 1.65 0.05
C– Time 3/ 72 9.48 << 0.0001
A × C– Treatments × Time 33/72 2.96 0.0001
Loge[TSIBAC]
A – Treatments 11/68 2.08 0.03 R2 = 91.3 (%) DWs = 2.6; (p** = 0.99)
B(A) – Mesocosms (Treatments) 24/68 2.57 0.001
C– Time 3/ 68 168.7 << 0.0001
A × C– Treatments × Time 33/68 1.28 0.19
Loge[TSIB/N]
A – Treatments 11/72 1.98 0.043 R2 = 74.5 (%) DWs = 2.63; (p**= 0.99)
B(A) – Mesocosms (Treatments) 24/72 1.36 0.16
C– Time 3/ 72 33.90 << 0.0001
A × C– Treatments × Time 33/72 1.41 0.11
Loge[TSImean]
A – Treatments 11/72 16.04 << 0.0001 R2 = 89.9; DWs = 2.4 (p** = 0.98)
B(A) – Mesocosms (Treatments) 24/72 2.05 0.01
C – Time 3/ 72 49.4 << 0.0001
A × C– Treatments × Time 33/72 2.37 0.0012

Quantitative and qualitative features of rotifer communities used to calculate rotifer trophic state indices: N – the number of rotifers (ind. l−1), B– rotifer biomass (mg l−1), BAC – bacterivores in the total number of rotifers (%), TECTA – percentage of the tecta form in the Keratella cochlearis population; B/N – ratio of rotifer biomass to rotifer count (μg ind.−1), IHT – contribution of species indicating the high trophic status in the indicator group (%); N/a – not applicable

Treatment No. After 1 day of the experiment After 32 days of the experiment
N B BAC TECTA B/N IHT N B BAC TECTA B/N IHT
Control 1 714 0.160 5.3 50.0 0.236 96.4 1516 0.117 78.8 0.0 0.077 100.0
2 923 0.201 12.7 24.0 0.218 97.9 2498 0.187 89.4 7.2 0.075 N/a
3 1346 0.363 15.3 15.8 0.269 95.5 3405 0.444 74.4 0.8 0.130 100.0
C + Crustacea (Cr) 1 700 0.185 5.1 15.4 0.264 89.0 2185 0.190 81.5 0.5 0.087 100.0
2 567 0.138 8.1 22.2 0.243 96.1 3993 0.424 83.4 3.9 0.106 100.0
3 512 0.098 17.4 0.0 0.192 86.0 709 0.082 51.6 N/a 0.116 100.0
C + Dreissena (Dp) 1 380 0.088 1.3 0.0 0.290 87.5 520 0.076 51.7 0.0 0.147 100.0
2 78 0.017 1.3 N/a 0.217 50.0 818 0.119 43.6 N/a 0.145 N/a
3 123 0.027 4.1 0.0 0.216 100.0 637 0.104 57.5 N/a 0.163 N/a
C + Nutrients (N) 1 217 0.040 2.3 100.0 0.184 100.0 1996 0.276 53.7 N/a 0.138 N/a
2 7338 1.652 5.2 33.7 0.225 92.2 2253 0.282 59.2 2.1 0.125 93.6
3 3181 0.736 7.4 18.8 0.231 95.7 1065 0.135 80.2 2.2 0.127 98.6
C + Fish (F) 1 1147 0.270 7.1 8.0 0.236 95.2 1428 0.141 60.3 0.0 0.099 100.0
2 1616 0.358 14.0 39.1 0.222 95.9 2615 0.440 76.1 6.8 0.168 100.0
3 1465 0.351 2.6 23.5 0.240 90.4 3044 0.285 66.0 0.0 0.094 100.0
C + Crustacea + Dreissena (CrDp) 1 408 0.090 2.2 N/a 0.220 90.5 186 0.045 50.0 N/a 0.241 N/a
2 136 0.030 0.7 N/a 0.224 33.3 135 0.021 28.1 N/a 0.151 N/a
3 308 0.072 4.5 0.0 0.234 68.4 290 0.044 52.4 N/a 0.151 N/a
C + Fish + Crustacea (FCr) 1 726 0.189 0.8 0.0 0.260 85.6 1162 0.090 70.6 0.0 0.078 100.0
2 1907 0.479 7.0 41.9 0.251 92.0 3004 0.369 71.7 0.5 0.123 100.0
3 1663 0.418 7.3 5.9 0.251 93.6 6988 0.469 85.3 3.5 0.067 100.0
C + Nutrients + Crustacea (NCr) 1 3190 0.682 6.5 26.9 0.214 96.4 4698 0.407 87.3 1.2 0.087 99.6
2 5304 1.072 5.5 19.8 0.202 93.6 2008 0.170 69.2 1.2 0.085 99.6
3 4054 0.881 3.8 25.7 0.217 92.7 3442 0.465 48.8 N/a 0.135 100.0
C + Nutrients + Dreissena (NDp) 1 451 0.104 1.8 N/a 0.231 55.5 285 0.039 58.6 N/a 0.136 100.0
2 328 0.071 0.6 N/a 0.217 0.0 1886 0.316 65.9 N/a 0.168 N/a
3 504 0.132 0.2 0.0 0.262 12.9 2132 0.311 63.9 N/a 0.146 N/a
C + Nutrients + Fish (NF) 1 3331 0.730 3.4 38.9 0.219 97.6 1153 0.112 79.9 0.5 0.097 99.6
2 2076 0.424 16.2 27.8 0.204 97.9 4719 0.573 47.8 N/a 0.121 N/a
3 5327 1.285 1.3 35.4 0.241 84.8 772 0.062 35.6 0.0 0.081 99.2
C + Nutrients + Dreissena + Crustacea (NDpCr) 1 1003 0.217 0.0 0.0 0.217 0.0 844 0.133 73.2 N/a 0.158 N/a
2 584 0.132 0.9 N/a 0.227 54.5 1555 0.298 48.8 N/a 0.192 N/a
3 251 0.065 0.0 N/a 0.258 14.3 647 0.144 49.6 N/a 0.223 N/a
C + Nutrients + Fish + Crustacea (NFCr) 1 1674 0.389 3.5 46.2 0.233 92.5 714 0.740 75.8 1.5 0.103 100.0
2 7374 1.619 6.5 40.5 0.221 94.5 2652 0.336 58.9 0.0 0.127 97.5
3 3888 0.880 7.8 28.9 0.226 94.4 2990 0.342 60.6 N/a 0.114 100.0
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