Assessment of habitats on typical low hills in the Yitong River in Northeast China

Figures & data

Figure 1. Drainage map of Yitong River and location of sampling reaches.

Table 1. Basic hydrological data of Yitong River.

Item	Average river valley width (m)	Annual runoff (m^3/s)	Average slope (‰)	Vegetation coverage (%)
Upstream (101 km)	1500	19.83	0.5	63
Midstream (135 km)	7000	19.96	0.3	31
Downstream (107 km)	9000	141.02	0.2	15

Table 2. Pearson correlation matrix between metrics of Habitat Quality Assessment (HQA) and Habitat Modification Score (HMS).

	A1	A2	A3	A4	A5	A6	A7	A8	A9	A10
A2	−0.267	1
A3	0.525**	−0.182	1
A4	−0.029	0.255	−0.417	1
A5	−0.087	0.281*	−0.216	0.259	1
A6	0.191	0.042	0.279*	0.075	0.188	1
A7	−0.125	0.087	−0.308*	0.172	0.198	−0.192	1
A8	0.266	0.077	0.383**	−0.171	0.066	−0.039	−0.038	1
A9	−0.215	0.241	−0.228	0.319*	0.291*	−0.028	0.548**	−0.377**	1
A10	0.486**	−0.179	0.455**	−0.123	0.089	0.392*	−0.291*	0.293*	−0.312*	1

*p < 0.05, **p < 0.01.

Table 3. Pearson correlation matrix between metrics of Habitat Modification Score (HMS).

	S1	S3	S5	S9	S11	S12	S13	S14	S15
S3	0.306*	1
S5	−0.052	0.011	1
S9	−0.062	−0.117	0.093	1
S11	0.143	0.322*	0.312*	−0.055	1
S12	−0.106	0.113	0.113	−0.215	0.171	1
S13	0.067	0.282*	0.076	0.055	0.029	0.055	1
S14	0.449**	0.377**	−0.066	−0.107	0.101	0.313*	0.042	1
S15	0.043	0.036	0.425**	0.102	0.113	0.181	0.168	0.087	1
S16	−0.057	0.478**	0.276*	−0.076	0.799**	0.228	0.222	0.022	0.146

*p < 0.05, **p < 0.01.

Table 4. Principal components of assessment categories of Habitat Quality Assessment (HQA) and Habitat Modification Score (HMS).

Item of Habitat Quality Assessment	PC1	PC2	PC3	PC4	PC5	Item of Habitat Modification Score	PC1	PC2	PC3	PC4	PC5
Eigenvalues	3.027	1.662	1.147	1.115	0.862	Eigenvalues	2.567	1.683	1.275	1.193	1.005
Contribution rates	30.283	16.626	11.495	11.139	8.558	Contribution rates	25.662	16.813	12.698	11.972	10.035
Cumulative contribution rates	30.288	46.785	58,394	68.489	79.396	Cumulative contribution rates	25.657	42.515	55.267	67.205	77.239
Assessment categories						Assessment categories
A1	0.6346	0.2873	−0.0356	0.4356	0.3005	S1	0.278	−0.635	0.376	0.221	−0.361
A2	−0.3977	0.3837	0.3757	−0.4733	−0.2359	S3	0.671	−0.387	−0.025	0.287	0.183
A3	0.7758	0.1232	0.0861	0.2156	−0.3562	S5	0.425	0.578	0.315	−0.167	−0.256
A4	−0.4693	0.4617	−0.1967	−0.0673	0.6027	S9	−0.173	0.326	0.491	0.419	−0.091
A5	−0.3013	0.6782	0.1892	−0.0981	−0.0072	S11	0.739	0.231	−0.316	0.187	−0.329
A6	0.3023	0.6238	−0.4627	−0.1591	−0.3102	S12	0.419	−0.031	−0.152	−0.731	0.231
A7	−0.5701	0.1275	0.2981	0.6519	−0.0546	S13	0.352	0.019	0.336	0.281	0.771
A8	0.4359	0.1764	0.7807	−0.0456	0.1381	S14	0.411	−0.667	0.271	−0.279	−0.132
A9	−0.6782	0.3055	−0.1028	0.4673	−0.3011	S15	0.372	0.391	0.618	−0.351	−0.029
A10	0.6591	0.4582	−0.0925	0.0319	0.1030	S16	0.822	0.278	−0.371	0.215	0.032

Figure 2. Satellite map of Yitong River basin.

Figure 3. Linear regressions between Habitat Quality Assessment (HQA) and Habitat Modification Score (HMS).

Table 5. Habitat Quality Assessment (HQA) and Habitat Modification Score (HMS) of sampling reaches in upstream, midstream and downstream of Yitong River.

	A1	A2	A3	A4	A5	A6	A7	A8	A9	A10	HQA
Upstream	9.27	5.78	5.19	4.49	7.69	0.39	0.06	3.55	0.17	9.79	46.22
Midstream	8.15	6.33	3.46	6.55	9.93	0.15	0.52	2.03	0.52	7.39	45.22
Downstream	8.23	6.51	3.76	6.17	8.17	0.19	1.32	0.56	4.20	6.11	45.37
Kruskal–Wallis test (%)	0.139	0.335	0.009	0.065	0.231	0.376	<0.001	<0.001	<0.001	0.073	0.922
	S1	S3	S5	S9	S11	S12	S13	S14	S15	S16	HMS
Upstream	0	1.62	6.47	0.03	0	3.63	0.41	0.07	0.77	0.02	13.18
Midstream	0	1.56	4.41	0.06	0.69	6.29	0.40	0.18	0.51	–	14.13
Downstream	0.51	5.62	4.97	0.13	14.33	3.51	0.30	0.41	0.60	1.61	31.69
Kruskal–Wallis test (%)	0.018	0.043	0.165	0.517	<0.001	0.350	0.802	0.169	0.822	0.015	0.031
Upstream	0	73.01	96.02	4.01	0	64.11	28.10	8.02	36.01	4.03	–
Midstream	0	57.81	83.21	8.23	8.29	83.21	32.91	8.34	33.56	–	–
Downstream	21.34	78.57	92.88	15.02	71.07	50.10	22.01	28.59	50.12	28.39	–