Table/Figure – Pesticides Research No. 127 2009 – Buffer zones for biodiversity of plants and arthropods: is there a compromise on width?

Buffer zones for biodiversity of plants and arthropods: is there a compromise on width?

Table 3.12. Schematic summary of the statistical analyses on diversity of selected herbaceous-dwelling coleopterans.

Taxa	Diversity measure	Test results F_(ndf,ddf)^P¹
		Buffer²	Distance³	Buffer × Distance⁴	Period⁵	Period × Buffer⁶	Period × Distance⁷	Period × Buffer × Distance⁸
Heteroptera species	Species richness	22.79_{(4, 72)}^***	132.91_{(4, 72)}^***	3.54_{(16, 72)}^***	276.36_{(2, 150)}^***	11.17_{(8, 150)}^***	10.52_{(8, 150)}^***	2.86_{(32, 150)}^***
Heteroptera species	Shannon	11.50_{(4, 72)}^***	53.69_{(4, 72)}^***	1.00_{(16, 150)}^NS	277.49_{(2, 150)}^***	13.02_{(8, 150)}^***	29.39_{(8, 150)}^***	2.74_{(32, 150)}^***
Coleoptera species⁹	Species richness	16.15_{(4, 12)}^***	4.37_{(4, 12)}^*	2.93_{(16, 48)}^**	49.14_{(2, 150)}^***	9.01_{(8, 150)}^***	5.24_{(8, 150)}^***	2.28_{(32, 150)}^***
Coleoptera species⁹	Shannon	5.92_{(4, x)}^**	2.62_{(4, x)}^(P=0.08)	1.06_{(16, x)}^NS	18.51_{(2, x)}^***	4.39_{(8, x)}^***	4.82_{(8, x)}^***	0.91_{(32, x)}^NS

¹^NSNot significant, ^*P < 0.05, ^**P < 0.01, ^***P < 0.001. F is the F-value, ndf and ddf is the numerator and denominator degree of freedom used for testing the significance.

² Effect of buffer width (0, 4, 6, 12 and 24 m).

³ Effect of distance from field edge (sampling was carried out 0, 2, 5, 9 and 18 m from the field edge).

⁴Effect of the combination of distance and buffer width (in total there were 5 × 5 = 25 combinations).

⁵Three sampling periods: 1. After herbicide application (May), 2. After first insecticide application (June), 3. After second insecticide application (July).

⁶Effect of buffer at each sampling period.

⁷Effect of distance from field edge at each sampling period.

⁸Effect of the combination of distance and buffer width at each sampling period.

⁹Among the coleopterans only the families Chrysomelidae and Curculionidea were included.