Table 1. Details of transects laid along the elevation gradient of Sikkim, Eastern Himalaya.

Transect	Elevation (m)	Vegetation Types	Latitude(° ′N)	Longitude(° ′E)	Effort
T1	300	TrSDF	27 12.1	88 28.9	14
T2	450	TrSDF	27 14.8	88 27.2	14
T3	600	TrSDF	27 14.3	88 28.4	15
T4	750	TrSDF	27 15.1	88 26.6	14
T5	900	TrSDF	27 29.3	88 30.6	16
T6	1050	TrMBF	27 29.4	88 30.7	16
T7	1200	TrMBF	27 29.5	88 30.2	12
T8	1350	TrMBF	27 33.1	88 38.5	15
T9	1500	TrMBF	27 34.2	88 39.2	15
T10	1650	TrMBF	27 36.2	88 38.6	15
T11	1900	TBF	27 37.6	88 36.9	15
T12	2150	TBF	27 37.7	88 42.2	16
T13	2400	TBF	27 39.8	88 36.3	15
T14	2650	TBF	27 39.5	88 43.7	15
T15	2850	TCF	27 41.1	88 45.4	12
T16	3050	TCF	27 45.2	88 43.8	12
T17	3250	TCF	27 46.8	88 42.5	11
T18	3450	TCF	27 48.4	88 42.7	14
T19	3650	TCF	27 49.3	88 42.5	12
T20	4000	SAV	27 51.4	88 41.6	12
T21	4350	SAV	27 52.2	88 41.7	13
T22	4700	AV	27 54.8	88 41.9	10

TrSDF - Tropical semi-deciduous forests; TrMBF - Tropical moist and broad-leaved forests; TBF - Temperate broad-leaved forests; TCF - Temperate coniferous forests; SAV - Sub Alpine vegetation and AV - Alpine vegetation. Effort - No. of times each transect was repeated for sampling birds.