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

Ejsmont-Karabin, Jolanta; Feniova, Irina; Kostrzewska-Szlakowska, Iwona; Rzepecki, Marek; Petrosyan, Varos G.; Dzialowski, Andrew R.

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

Oceanological and Hydrobiological Studies

Volume 49 (2020): Issue 2 (June 2020)

By:

Jolanta Ejsmont-Karabin, Irina Feniova, Iwona Kostrzewska-Szlakowska, Marek Rzepecki, Varos G. Petrosyan and Andrew R. Dzialowski

Open Access

|Jun 2020

Figures & Tables

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)
Log_e[TSI_N]
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
Log_e[TSI_B]
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
Log_e[TSI_BAC]
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
Log_e[TSI_B/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
Log_e[TSI_mean]
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
Treatment	No.	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

DOI: https://doi.org/10.1515/ohs-2020-0011 | Journal eISSN: 1897-3191 | Journal ISSN: 1730-413X

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Language: English

Page range: 123 - 131

Submitted on: Aug 19, 2019

Accepted on: Nov 4, 2019

Published on: Jun 18, 2020

Published by: Sciendo

In partnership with: Paradigm Publishing Services

Publication frequency: 4 times per year

Keywords:

Rotifera,

eutrophic lake,

effects of Dreissena’s,

fish,

Related subjects:

© 2020 Jolanta Ejsmont-Karabin, Irina Feniova, Iwona Kostrzewska-Szlakowska, Marek Rzepecki, Varos G. Petrosyan, Andrew R. Dzialowski, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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