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Table 1 The use of different bush species as nest cover in the Tibetan Partridge in relation to their general occurrence in the study area

From: Nest distribution and nest habitat of the Tibetan Partridge (Perdix hodgsoniae) near Lhasa, Tibet

Plant species n Nest bush height (cm) Basal area of nesting bush (cm 2 ) Foliage cover above nest (%) Availability Usage
Bush density/m 2 Percent of total bush density Percent of all nests Electivity index
Potentilla fruticosa 34 51.21 ± 13.11 3402 ± 2586 64.12 ± 15.3 0.25 17.47 60.71 0.57
Rosa sericea 2 65 ± 49.5 7967 ± 3837 80 ± 0 0.053 3.7 3.57 0.01
Rhododendron primulaeflorum 9 68.88 ± 19.37 2372 ± 1250 72.78 ± 12.53 0.256 17.92 16.07 −0.03
Caragana maximovicziana 1 34 560 40 0.032 2.23 1.79 −0.09
Berberis hemleyana 1 102 620 70 0.045 3.47 1.79 −0.3
Salix oritrepha 4 87.25 ± 51 3227 ± 1683 60 ± 20 0.202 14.11 7.14 −0.3
Sabina pingii 1 45 32340 30 0.09 6.27 1.79 −0.54
Spiraea tibetica 1 51 3705 60 0.194 13.55 1.79 −0.76
Rhododendron nivale 0 - - - 0.219 15.34 0 −1
Caragana jubata 0 - - - 0.022 1.57 0 −1
Cotoneaster microphyllus 0 - - - 0.062 4.37 0 −1
Total      1.425 100 94.65  
Nests below herbs (n = 3)        5.35  
  1. The electivity index varies from −1 to +1 where positive values indicate preference and negative values indicate avoidance.