Urban Infestation Patterns of Argentine Ants, Linepithema humile, in Los Angeles

Table 1

Summary statistics using Spearman rank correlations (𝑍-values) and Kruskal-Wallis tests (𝐻 values). For the Kruskal-Wallis tests 𝑏, 𝑔, and 𝑖 refer to number of gardens with predominant groundcover of bushes, grass or ivy, respectively.

Garden size and ant density	𝑍-value	𝑃 value	𝑛
All months	−0.377	NS	12
Hot months (>21^°C)	0.252	NS	8
Cold months (<21^°C)	−0.693	NS	4
Wet months (>1 cm)	−0.898	NS	8
Dry months (<1 cm)	1.386	NS	4
Garden type and ant density	𝐻 value	𝑃 value	b, g, i
All months	0.526	NS	3, 3, 6
Hot months (>21^°C)	0.717	NS	1, 2, 5
Cold months (<21^°C)	0.300	NS	2, 1, 1
Wet months (>1 cm)	0.125	NS	2, 2, 4
Dry months (<1 cm)	2.700	NS	1, 1, 2
Infestations and ant density	𝑍-value	𝑃 value	𝑛
Hot months (>21^°C)	−0.598	NS	8
Cold months (<21^°C)	1.126	NS	4
Wet months (>1 cm)	1.606	NS	8
Dry months (<1 cm)	−0.693	NS	4
Infestations and garden type	𝐻 value	𝑃 value	b, g, i
All months	0.606	NS	3, 4, 7
Hot, dry months (>21^°C, <1 cm)	0.366	NS	3, 4, 7
Cold, dry months (<21^°C, <1 cm)	0.008	NS	3, 4, 7
Hot, wet months (>21^°C, >1 cm)	0.733	NS	3, 4, 7
Cold, wet months (<21^°C, <1 cm)	1.168	NS	3, 4, 7
Infestations and garden size	𝑍-value	𝑃 value	𝑛
All months	−2.104	0.0354	12
Hot, dry months (>21^°C, <1 cm)	−1.853	0.0638	12
Cold, dry months (<21^°C, <1 cm)	−1.525	NS	12
Hot, wet months (>21^°C, >1 cm)	−2.104	0.0354	12
Cold, wet months (<21^°C, <1 cm)	−2.299	0.0215	12