Table 1. Contracted environmental variables.

	Name	Description
Single variable	BPMC	concentration of insecticide BPMC
	Probenazole	concentration of fungicide Probenazole
	Shallowness	(maximum depth among ponds)–(focal pond depth)
	F-plant noncoverage	100 – (F-plant coverage rate)
	Concrete bank	proportion of pond bank covered by concrete dike
	Pond drainage	pond drainage intensity (0: no drainage, 1: partial drainage, 2: full drainage)
	Bluegill	found(1)/unfound(0) of invasive alien fish Lepomis macrochirus
	Red swamp crayfish	found(1)/unfound(0) of invasive alien crayfish Procambarus clarkii
	Bullfrog	found(1)/unfound(0) of invasive alien frog Lithobates catesbeianus
Grouped variable	IBP-Ignition_loss	first principal component axis for the contraction group consisting of IBP (fungicide) and Ignition loss
	Cont.var1, Cont.var2, Cont.var3, and Cont.var4	first four principal component axes for the contraction group consisting of Largemouth bass (Micropterus salmoides), WT (water temperature), pH, SS (suspended solids), Chla (chlorophyll a), TP (total phosphorus), TN (total nitrogen), Area (pond area), E-plant noncoverage, D-net sampling, 8 insecticides (Buprofezin, Clothianidin, Dinotefuran, Fipronil, Imidacloprid, Malathion, Tebufenozide, and Thiamethoxam), 6 fungicides (Azoxystrobin, Ferimzone, Fthalide, Furametpyr, Isoprothiolane, Metominostrobin-E, Metominostrobin-Z, Pyroquilon, Thifluzamide, and Tiadinil), 9 herbicides (Bentazone, Bromobutide, Butachlor, Chlomeprop, Dymron, Mefenacet, Oxaziclomefon, Pentoxazone, and Pyriminobac-methyl-E)