Coexistence of two newt species in a transition zone of range overlap Author Arntzen, Jan W. text Contributions to Zoology 2022 2022-03-21 91 2 133 151 http://dx.doi.org/10.1163/18759866-bja10028 journal article 10.1163/18759866-BJA10028 1875-9866 8343359

TABLE 1 Numbers of adult Lissotriton newts observed over 105 ponds in the western part of the department Pas de Calais in the 1974 to 2021 period. F v = Lv /(Lh + Lv)

Pond	Coordinates		Sample size for species		F v
number	Northern latitude	Eastern longitude	Lissotriton helveticus (N)	Lissotriton vulgaris (N)
1	50.770	1.772	21	1	0.05
2	50.871	1.617	194	175	0.47
3	50.902	1.679	223	9	0.04
4	50.901	1.678	126	7	0.05
5	50.870	1.606	580	24	0.04
6	50.902	1.680	233	6	0.03
7	50.869	1.608	34	1	0.03
8	50.869	1.609	20	0	0.00
9	50.875	1.656	26	2	0.07
10	50.855	1.666	410	149	0.27
11	50.854	1.664	188	96	0.34
12	50.839	1.672	108	10	0.08
13	50.837	1.675	29	5	0.15
14	50.820	1.631	65	41	0.39
15	50.858	1.630	26	6	0.19
16	50.861	1.610	92	34	0.27
17	50.860	1.606	43	0	0.00
18	50.849	1.597	186	87	0.32
19	50.853	1.595	27	11	0.29
20	50.866	1.608	107	46	0.30
21	50.844	1.590	104	76	0.42
22	50.844	1.598	26	16	0.38
23	50.844	1.599	83	66	0.44
24	50.845	1.599	812	182	0.18
25	50.845	1.599	45	16	0.26
26	50.845	1.599	53	40	0.43
27	50.845	1.599	86	35	0.29
28	50.845	1.600	41	16	0.28
29	50.845	1.600	79	33	0.29
30	50.845	1.600	70	17	0.20
31	50.845	1.601	51	45	0.47
32	50.846	1.600	1712	450	0.21
33	50.845	1.600	576	152	0.21
34	50.846	1.603	10	10	0.50
35	50.849	1.598	4	6	0.60
36	50.861	1.591	31	61	0.66
37	50.860	1.586	113	244	0.68
38	50.860	1.583	72	347	0.83
39	50.857	1.664	36	2	0.05
40	50.864	1.616	18	4	0.18
41	50.865	1.602	82	24	0.23
42	50.855	1.664	112	35	0.24
43	50.832	1.626	19	12	0.39
44	50.844	1.593	19	12	0.39
45	50.850	1.582	1	10	0.91
46	50.819	1.611	17	4	0.19
47	50.818	1.608	35	35	0.50
48	50.822	1.600	11	3	0.21
49	50.823	1.602	618	159	0.20
50	50.821	1.619	14	10	0.42
51	50.823	1.623	25	10	0.29
52	50.819	1.617	45	7	0.13
53	50.820	1.598	32	15	0.32
54	50.821	1.599	31	10	0.24
55	50.797	1.626	24	68	0.74
56	50.795	1.627	3	11	0.79
57	50.800	1.623	14	27	0.66
58	50.799	1.622	0	11	1.00
59	50.784	1.617	16	33	0.67
60	50.797	1.619	4	66	0.94
61	50.797	1.621	3	34	0.92
62	50.798	1.613	17	295	0.95
63	50.791	1.621	21	110	0.84
64	50.799	1.615	5	12	0.71
65	50.797	1.616	0	12	1.00
66	50.799	1.618	0	131	1.00
67	50.797	1.624	1	15	0.94
68	50.799	1.628	2	18	0.90
69	50.793	1.625	7	6	0.46
70	50.791	1.624	9	3	0.25
71	50.808	1.667	8	14	0.64
72	50.826	1.668	19	4	0.17
73	50.851	1.723	148	2	0.01
74	50.855	1.700	68	1	0.01
75	50.863	1.692	405	1	0.00
76	50.823	1.722	118	27	0.19
77	50.822	1.722	302	302	0.50
78	50.822	1.721	91	78	0.46
79	50.851	1.759	36	4	0.10
80	50.850	1.758	66	10	0.13
81	50.854	1.701	22	0	0.00
82	50.819	1.718	302	218	0.42
83	50.805	1.699	77	0	0.00
84	50.805	1.700	28	0	0.00
85	50.831	1.821	20	0	0.00
86	50.844	1.783	42	27	0.39
87	50.833	1.775	50	14	0.22
88	50.833	1.778	558	46	0.08
89	50.832	1.776	13	3	0.19
90	50.832	1.774	42	8	0.16
91	50.832	1.776	47	4	0.08
92	50.830	1.775	20	2	0.09
93	50.831	1.773	20	12	0.38
94	50.837	1.800	7	5	0.42
95	50.800	1.689	13	14	0.52
96	50.789	1.691	1883	6	0.00
97	50.778	1.679	66	1	0.01
98	50.779	1.659	13	0	0.00
99	50.771	1.666	327	3	0.01
100	50.774	1.673	20	0	0.00
101	50.779	1.606	87	50	0.36
102	50.807	1.690	32	0	0.00
103	50.797	1.688	27	1	0.04
104	50.801	1.690	17	1	0.06
105	50.789	1.690	13	0	0.00