Paradigm versus paradox on the prairie: testing competing stream fish movement frameworks using an imperiled Great Plains minnow

Table 3 Results of tests applied to upstream versus downstream movement distances and rates of prairie chub in the Red River, Salt Fork Red River, and Pease River in the Red River Basin of Texas and Oklahoma, USA during 2019 and 2020

River System	Movement Measurement	2019						2020
River System	Movement Measurement	US/DS	MWU Test Statistic (W)	p Value	Skew	Test Statistic (Z)	p Value	US/DS	MWU Test Statistic (W)	p Value	Skew	Test Statistic (Z)	p Value
Pooled	Distance	42/51	1035	0.78	0.97	3.58	< 0.01	64/54	1601	0.49	1.19	4.61	< 0.01
Red	Distance	5/7	8	0.15				34/28	482	0.938
Salt Fork	Distance	32/42	732	0.52				33/19	283	0.57
Pooled	Rate	42/51	1063	0.95	− 1.00	− 3.67	< 0.01	64/54	1428	0.11	1.88	6.22	< 0.01
Red	Rate	5/7	7	0.11				34/28	414	0.38
Salt Fork	Rate	32/42	759	0.35				33/19	269	0.41

The number of fish moving upstream (US) versus downstream (DS) are given for the pooled data (Red River, Salt Fork Red River, and Pease River), Red River only, and Salt Fork Red River only. We did not analyze the Pease River individually because of insufficient sample size. Test statistics and p values are given for Mann–Whitney U (MWU) tests of ranked movement distances and rates for upstream versus downstream (sample sizes give in US/DS), and skewness values, test statistics, and p values are given for frequency distributions of pooled data shown in Additional File 4

ISSN: 2051-3933