Individual targets for number of expected species found were achieved in about 68% of the Oregon hexagons. Percent-completion among individual hexagons ranged from 38% to 186%, and the median was 110%. As noted earlier, the targets for percent-completion were based on number of species expected, given the location and habitat. Among the 291 hexagons where observers achieved or surpassed the target number of species, the average number of hours spent covering the hexagon was 105 (range= 29 to 357 hours, median= 100), the average number of observers was 15 (range= 3 to 45, median= 13), and the average number of years the hexagon was covered was 2 (range= 2 to 5, median= 5). By region, the data are summarized as follows (regions).

For the squares, 20% achieved fully their individual targets for number of species found. Percent-completion ranged from 6% to 213%, and the median was 68%. Among the 77 squares where observers achieved or surpassed the target number of species, the average number of hours spent covering the square was 24 (range= 8 to 63 hours, median= 22), the average number of observers was 3 (range= 1 to 7, median= 3), and the average number of years the square was covered was 3 (range= 1 to 5, median= 3). By region, the data are summarized as follows (regions).

Targets for number of species confirmed to be breeding were met in 55% of the hexagons (range= 15-325% of target for confirmations, median= 106%) and in 12% of the squares (range= 0 � 242%, median= 36%).

One question of interest is, "How many species found in a hexagon were also found in the hexagon�s square?" This has practical implications for the design of future avian surveys. The area of each hexagon is 634.5 km², and the area of each square is 25 km². Note, however, that although each square comprises 25.4% of its hexagon, the number of species found in the associated square averaged 46% of the number found in both the square and the hexagon (range 9-86%, median= 46%). Project participants found an average of 0.21 species per km² in the hexagons that have squares (range 0.05- 6.82, median= 0.18 species per km²) and as noted above, they found an average of 1.91 species per km² in those squares (range 0.32- 4.24, median= 1.84 species per km²). The generally high density of species found in the squares might seem partly attributable to the ability of observers to survey the smaller area of the squares more thoroughly. However, the number of observer hours in the squares averaged 0.15 hr per km² as compared to an average of 0.19 per km² in the hexagons.

The higher apparent densities of species in the squares is perhaps best explained by two factors. One is the wider variety of satellite-sensed habitat types per unit area in the squares (average = 0.121 types per km²) as compared with the hexagons (average = 0.014 types per km²). The other factor is the natural tendency of species richness to "level off" as progressively larger areas are surveyed. Further analysis of the data should be undertaken to (a) apply more sophisticated statistical procedures to plot species-area curves statewide and by region, and (b) determine if species that were found in a hexagon but not in its square have similarities with regard to biological traits, e.g., typically large territory sizes, narrow habitat preferences.