Table 2.

Results from the mixed effect models for the total mollusk abundance, abundance of the three most common slug species, and mollusk eggs

				Vegetation characteristics			Functional group richness				Functional group cover
	Season	Year	Ant abundance	Veg. height	Plant biomass	Plant species richness	Tall herb species	Small herb species	Legume species	Grass species	Tall herb cover	Small herb cover	Legume cover	Grass cover
All mollusks	A>S	09>07>08	−0.75***	0.1*	–	−0.13†	–	−0.17*	–	–	–	−0.21**	–	–
Arion lusitanicus	S>A†	09>08>07	−1.00***	–	–	−0.47***	−0.30**	–	−0.36**	–	–	–	−2.30*	–
Deroceras reticulatum	A>S***	07>08>09	−0.30*	0.2*	–	0.19†	0.23**	–	–	–	–	–	–	−0.28**
Deroceras panormitanum	A>S***	09>07>08	−0.52*	–	0.48**	–	–	−0.23†	–	–	−0.22†	−0.49***	–	–
Mollusk eggs	A>S***	09>08>07	–	–	0.24**	–	–	–	–	–	–	–	–	–

Results from mixed effects models, as explained in the methods, with the slopes and significance for each response variable. Results for the variables that were excluded in a stepwise procedure from the full model are not shown (–). Plant diversity was log- and ant biomass arcsin sqrt transformed. Multiple comparisons for parametric models were performed - levels of factors shown in bold are significantly different from other levels (P < 0.05); Seasons: A, autumn; S, spring; Years: 2007, 2008, and 2009.

^†P < 0.1,

^*P < 0.05,

^**P < 0.01, and

^*****P < 0.001.