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 3.9. Schematic summary of the statistical analyses on diversity of Lepidoptera.

Taxa	Diversity Measure	Test results F_(ndf,ddf)^P¹
		Buffer²	Distance³	Buffer × Distance⁴	Period⁵	Period × Buffer⁶	Period × Distance⁷	Period × Buffer × Distance⁸
Lepidoptera Species	Species richness	13.50_{(4, 12)}^***	20.02_{(3, 9)}^***	1.86_{(12, 36)}^(P=0.07)	58.31_{(2, 120)}^***	0.45_{(8, 120)}^NS	1.82_{(6, 120)}^NS	1.31_{(24, 120)}^NS
Lepidoptera Species	Shannon´s H	4.85_{(4, 12)}^*	18.17_{(3, 9)}^***	0.56_{(12, 36)}^NS	54.85_{(2, 120)}^***	1.90_{(8, 120)}^(P=0.07)	7.22_{(6, 120)}^***	0.72_{(24, 120)}^NS
Bombus species	Species richness	2.33_{(4, 12)}^NS	35.33_{(3, 9)}^***	0.74_{(12, 36)}^NS	45.45_{(2, 120)}^***	1.42_{(8, 120)}^NS	5.34_{(6, 120)}^***	1.19_{(24, 120)}^NS
Bombus species	Shannon´s H	0.73_{(4, 12)}^NS	6.35_{(3, 9)}^*	0.86_{(12, 36)}^NS	21.18_{(2, 120)}^***	0.46_{(8, 120)}^NS	16.34_{(6, 120)}^***	0.93_{(24, 120)}^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 4 × 5 = 20 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.