Table 1. Overview of studied sites and respective biogeographical, ecological and spider assemblage characteristics.

Site	Climatic region	Habitat type	Altitude (m)	Family richness	Species richness	Number of individuals	Estimated species richness (Chao 1)	Reference
USA	Temperate	Mesic hardwood forest	800	17	76	1228	108	[29]
Portugal (Gerês)	Temperate/Mediterranean	Mixed English oak (Quercus robur L.) and Pyrenean oak (Quercus pyrenaica Willd.) woodland	650	25	117	1795	142	[30]
Portugal (Arrábida)	Mediterranean	Cork oak (Quercus suber L.) woodland	60	26	93	1473	106	[31]
Guyana	Tropical	Lowland moist forest	240	31	228	2934	234	[32]
Cameroon	Tropical	Mid-elevation moist forest	800	32	218	1407	310	J.A. Coddington et al., unpublished data
Tanzania	Tropical	High-elevation moist forest	1850	31	120	2330	155	[33]
Madagascar	Tropical	Mid-elevation moist forest	1000	33	291	3167	334	J.A. Coddington et al., unpublished data