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 3.15. Schematic summary of the statistical analyses on diversity of epigaeic predators.

Taxa	Diversity Measure	Test results F_(ndf,ddf)^P¹
		Field²	Distance³	Buffer⁴	Buffer × Distance⁵	Period⁶	Period × Buffer⁷	Period × Distance⁸	Period × Buffer × Distance⁹
Araneae Families	Family richness	3.46_{(3, 12)}^NS	12.32_{(4, 210)}^***	10.67_{(4, 12)}^***	1.99_{(16, 210)}^*	140.23_{(2, 210)}^***	9.04_{(8, 210)}^***	3.68_{(8, 210)}^***	1.64_{(32, 210)}^*
Araneae Families	Shannon´s H	7.74_{(3, 12.07)}^**	8.73_{(4, 12)}^***	0.46_{(4, 12)}^NS	10.54_{(16, 198)}^NS	201.67_{(2, 198)}^***	1.93_{(8, 198)}^NS	3.02_{(8, 198)}^**	0.55_{(32, 198)}^NS
Carabidae Species	Species richness	21.49_{(3, 13.5)}^***	5.58_{(4, 12)}^**	2.76_{(4, 12)}^NS	0.86_{(16, 198)}^NS	116.85_{(2, 198)}^***	3.30_{(8, 198)}^**	2.80_{(8, 198)}^**	0.99_{(32, 198)}^NS
Carabidae Species	Shannon´s H	22.51_{(3, 13.62)}^***	5.32_{(4, 12)}^*	2.29_{(4, 12)}^NS	1.03_{(16, 198)}^NS	124.91_{(2, 198)}^***	1.92_{(8, 198)}^NS	3.14_{(8, 198)}^**	1.07_{(32, 198)}^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 field (four fields were included in the experiment).

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

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

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

⁶Three sampling periods: 1. After herbicide application (May), 2. After first insecticide application (June), 3. After second insecticide application (July).

⁷Effect of buffer at each sampling period.

⁸Effect of distance from field edge at each sampling period.

⁹Effect of the combination of distance and buffer width at each sampling period.