《Table 1 Variables used to estimate the site occupancy rate and detection probability of Tibetan Sno

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《Habitat use and diel activity pattern of the Tibetan Snowcock(Tetraogallus tibetanus):a case study using camera traps for surveying high-elevation bird species》

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To examine the habitat use of the Tibetan Snowcock，we divided the entire monitoring period into consecutive 5-day segments.Then，as described by Mackenzie et al.（2002），we set up a Tibetan Snowcock detection matrix，which would meet the two assumptions of this model as outlined in the introduction.Each element in the matrix represented one segment at one camera trap sampling site.We used 1 to represent that the Tibetan Snowcock was detected in this segment，used 0 to represent no detection，and used NA to represent data missing.Detection probability of the Tibetan Snowcock was assessed in relation to two detection covariates，and ten site covariates were considered to be potentially influential for its habitat use（Table 1）.The elevation，slope，and aspect data were recorded by the field staff.The EVI（enhanced vegetation index）data were acquired from the Geospatial Data Cloud of the Chinese Academy of Sciences（http://www.gsclo ud.cn）.The administration of the Gongga Mountain National Nature Reserve provided the raw data on rivers，settlements，and roads.Therefore，the other six site variables（distance to the nearest river，distance to the nearest settlement，distance to the nearest road，river density，settlement density，road density）were extracted using geographic information systems（GIS）and the raw data.