Rheophilic fish in oxbow lakes of the Warta River – the effect of environmental conditions on habitat selection

Oxbow lake	Km	Area (ha)	Maximum length/width (m)	Max depth (m)	Bottom substrate (%)	Submerged vegetation	Surroundings (%)
Święte (SW)	409	1.5	570/40	2.5	90S; 10M	+	60M; 40SH
Madałowe (M)	359	2.6	620/50	3.5	70M; 20S; 10G	++	90M; 10F
Tarnowa (TR)	348	1.0	320/60	2.5	60S; 40M	+++	60M; 40SH
Trzykolne Młyny (TM)	278	0.9	280/35	2.0	80M; 20S	+++	70M; 30SH
Tuchoń (T)	278	4.7	1170/90	5.0	50S; 50M	++	70F; 30M
Święconka (SC)	277	6.0	970/130	4.5	80S; 10G; 10M	+++	40B; 60M

Bottom substrate: G – gravel, S – sand, M – mud; Submerged vegetation abundance: +small, ++ – medium, +++ – high; Surroundings: F – forest, M – meadow, SH – shrubs, B – buildings

Dissolved oxygen concentration in the benthic zone in the summer (minimum,maximum, mean); means with the same letter don`t differ statistically

Average contribution of rheophilic species to the dominance structure of ichthyofauna in oxbow lakes (A), in the Warta near Pyzdry (B), and in the Warta near Rogalin (C)

Fluctuations in the contribution of rheophilic species in the dominance structure in catches from six oxbow lakes in three periods.

Fluctuations in the contribution of selected species in the dominance structure of rheophiles from six oxbow lakes in three periods.

Fluctuations in four traits of all rheophilic species (chub, asp, vimba, nase, dace, ide, blue bream, gudgeon, burbot) in six oxbow lakes throughout the year (Mean, SE, SD)

Table 2

Fish species recorded in six oxbow lakes (C – constancy of occurrence in all catches; D – percentage in dominance structure; rheophilic species are given in bold)

No	Species	SW	M	TR	TM	T	SC	C [%]	Reproductive guilds, contribution (D%)
1	*Leuciscus cephalus*	0	+	+	+	0	+	17	Lithophils, 2.1
2	*Aspius aspius*	+	+	0	+	+	+	44
3	*Vimba vimba*	0	0	0	+	0	0	4
4	*Chondrostoma nasus*	0	+	0	0	0	0	2
5	*Leuciscus leuciscus*	0	0	+	0	+	0	7	Phyto-lithophils, 85.2
6	*Leuciscus idus*	+	+	+	+	+	+	67
7	Blicca bjoerkna	+	+	+	+	+	+	89
8	Perca fluviatilis	+	+	+	+	+	+	96
9	Gymnocephalus cernuus	0	+	+	0	0	+	20
10	Rutilus rutilus	+	+	+	+	+	+	96
11	Alburnus alburnus	0	+	+	+	+	+	46
12	Abramis brama	+	+	+	+	+	+	85
13	*Abramis ballerus*	0	0	0	+	0	+	17
14	Esox lucius	+	+	+	+	+	+	96	Phytophils, 12.1
15	Scardinius erythrophthalmus	0	+	+	+	+	+	65
16	Tinca tinca	+	+	+	+	+	+	80
17	Carassius carassius	0	+	+	0	+	+	30
18	Carassius gibelio	0	+	+	0	+	+	43
19	Cyprinus carpio	0	0	+	0	0	0	2
20	Misgurnus fossilis	0	+	+	0	0	+	6
21	Cobitis taenia	+	+	+	+	+	+	41
22	Silurus glanis	+	+	0	+	0	0	6
23	Stizostedion lucioperca	+	+	0	+	+	+	19
24	Gobio gobio	+	0	0	0	0	0	2	Psammophils, 0.1
25	Lota lota	+	+	0	0	0	0	9	Litho-pelagophils, 0.3
26	Rhodeus sericeus	0	0	+	0	0	0	9	Ostracophils, 0.2
	Number of species	13	20	18	16	15	18

Table 3

Statistical influence of experimental factors on the analyzed traits

Experimental factor	DF	Analyzed traits
		Number of species		Number of specimens		Mass		Mean individual mass
		F	p	F	p	F	p	F	p
Oxbow lake	5	3.80	0.0075	3.68	0.0088	4.98	0.0015	9.04	0.0001
Season	2	6.02	0.0057	0.65	0.5297	1.65	0.2075	2.79	0.0754
Oxbow lake × Season interaction	10	5.49	0.0001	1.61	0.1454	1.53	0.1712	7.92	0.0001

Effects of factors: – highly significant (P≤0.05); – significant (P≤0.1); – non-significant (P>0.1)

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DOI: https://doi.org/10.1515/ohs-2017-0005 | Journal eISSN: 1897-3191 | Journal ISSN: 1730-413X

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Language: English

Page range: 38 - 49

Submitted on: Apr 25, 2016

Accepted on: Aug 1, 2016

Published on: Mar 6, 2017

Published by: University of Gdańsk

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

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© 2017 Janusz Golski, Piotr Pińskwar, Maria Jezierska-Madziar, Wojciech Andrzejewski, Jan Mazurkiewicz, Daniel Stanisławski, Maria Urbańska, published by University of Gdańsk
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Volume 46 (2017): Issue 1 (March 2017)

Rheophilic fish in oxbow lakes of the Warta River – the effect of environmental conditions on habitat selection

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