7-48. A48-153. P.S. 250 first photo looking N. Scant grass cover Agl, Ber, Hco and others. Some Afr, good stand of cholla and Pve. SRER. Culley. 10H(3)b.

PS 250. Azimuth 20. July 24, 1987. RFB. Canon AE-1 35mm camera. 35mm WA lens. Robert F. Buttery.

PS 250. April 17, 2000. Facing north. Azimuth 20. Pasture 6A. ASA 135, Plus X film. 35mm lens focal length. 100' SW from PS 97; 40' from road. Large shrub in foreground is mesquite. Eragrostis lehmanniana, burroweed, bush muhly, tanglehead, cottontop, black grama. M. McClaran.

PS. 250. 30 March 2007. Facing north, Azimuth 20. Pasture 6A. Elevation 1186 m. ISO 100, 35mm focal length, Canon 5D Digital Camera. Painted and tagged rebar present, camera above. Mesquite alive. About 90% burroweed alive. Cholla and prickly pear cacti present. Lehmann lovegrass dominant grass, also find Bouteloua aristidoides, tanglehead, black grama, and threeawns: bush muhly and cottontop under larger mesquite. Large mesquite present in 1948 photo are currently present behind foreground mesquite. The current foreground mesquite appear to be very small plants in 1948 photo. Compared to 2000, less grass, and more cholla, and prickly pear. M. McClaran photographer, F. Mashiri assistant.

PS. 250. 19 March 2009. Facing north, Azimuth 20. Pasture 6A. Elevation 1186 m. ISO 100, 35mm focal length, Canon 5D Digital Camera. Painted and tagged rebar present, camera above. Mesquite and burroweed alive. Cholla and prickly pear cacti present. Lehmann lovegrass dominant grass, also find Bouteloua aristidoides, tanglehead, black grama, and threeawns: bush muhly and cottontop under larger mesquite. Large mesquite present in 1948 photo are currently present behind foreground mesquite. The current foreground mesquite appear to be very small plants in 1948 photo. The same mesquite with green leaves in 2009 had green leaves first in 2007. Compared to 2007, more grass, especially cottontop and threeawns; and larger cholla and prickly pear. M. McClaran photographer, A. Peterson assistant.

PS. 250. 19 March 2015. 1:43 pm. Facing north, Azimuth 20. Pasture 6A. Elevation 1186 m. ISO 320, 35mm focal length, Canon 5D Mark II Digital Camera. Painted and tagged rebar present, camera above. Mesquite alive, with leaves emerging. Littleleaf baccharis present. Cholla and prickly pear cacti present. Lehmann lovegrass, tanglehead, black grama, and threeawns: bush muhly, Setaria and cottontop under larger mesquite. Tanglehead and threeawns most abundant. Note poppies flowering in mid-left.Large mesquite present in 1948 photo are currently present behind foreground mesquite. The current foreground mesquite appears to be very small plants in 1948 photo. Compared to 2009, no burroweed plants in view, but some outside of view; less grass, especially Lehmann lovegrass; decline of prickly pear; and increase (size and number) of cholla. M. McClaran photographer, K. Hawkes assistant.

PS. 250. 26 March 2021. 12:23 pm. Facing north, Azimuth 20. Pasture 6A. Elevation 1186 m. ISO 125, 35mm focal length, Canon 5D Mark II Digital Camera. Painted and tagged rebar present, camera above. Mesquite alive, with leaves emerging. Cholla and prickly pear cacti and burroweed present. Lehmann lovegrass, tanglehead, black grama, and threeawns: bush muhly, Setaria and cottontop under larger mesquite. Cottontop and threeawns most abundant. Large mesquites present in 1948 photo are currently present behind foreground mesquite. The current foreground mesquite appears to be very small plants in 1948 photo. Compared to 2015, no littleleaf baccharis, Lehmann lovegrass, or poppies; burroweed now present; more perennial grass; tanglehead and prickly pear declined; cholla increased in size. M. McClaran photographer, A. Gorlier assistant.

7-48. A48-152. P.S. 250 first photo 40 feet east of the road about 150 yds north of enclosure 40 in pasture 6A. Looking S. Fair grass stand Ber, Agl, Hco, and others. Heavy growth of young cholla. Some Afr. Closely grazed and much of the grass appears dead from the drought. SRER. Culley. 10H(3)b.

T-282. 4 Aug 60. SRER, P.S. 250. 10H3b.

PS 250. Azimuth 170. July 24, 1987. RFB. Canon AE-1 35mm camera. 35mm WA lens. Robert F. Buttery.

PS 250. April 17, 2000. Facing south. Azimuth 170. Pasture 6A. ASA 135, Plus X film. 35mm lens focal length. 100' SW from PS 97; 40' from road. Taken at post. Foreground mesquite has died back since 1987. Eragrostis lehmanniana, burroweed, bush muhly, tanglehead, cottontop, black grama. M. McClaran.

PS. 250. 30 March 2007. Facing south, Azimuth 170. Pasture 6A. Elevation 1186 m. ISO 100, 35mm focal length, Canon 5D Digital Camera. Painted and tagged rebar present, camera above. View is blocked by young mesquite. Mesquite alive. About 90% burroweed alive. Cholla and prickly pear cacti present. Bush muhly is dominant grass, also find Lehmann lovegrass, Bouteloua aristidoides, black grama, and threeawns: bush muhly and cottontop under larger mesquite. Large mesquites present in 1948 photo are currently present behind foreground mesquite. The current foreground mesquite appears to be very small plants at bottom center of 1948 photo. Comparison with 2000 not possible because view is blocked. M. McClaran photographer, F. Mashiri assistant.

PS. 250. 19 March 2009. Facing south, Azimuth 170. Pasture 6A. Elevation 1186 m. ISO 100, 35mm focal length, Canon 5D Digital Camera. Painted and tagged rebar present, camera above. View is blocked by young mesquite. Comparison with 2007, extensive stem girdling; making this a good example of impacts of stem girdling on twig demography because able to see past and present girdling locations. Leaves will emerge very soon. M. McClaran photographer, A. Peterson assistant.

PS. 250. 19 March 2015. 1:46 pm. Facing south, Azimuth 170. Pasture 6A. Elevation 1186 m. ISO 400, 35mm focal length, Canon 5D Mark II Digital Camera. Painted and tagged rebar present, camera above. View is blocked by young mesquite (leaves emerging). Comparison with 2009, some branches missing and others show stem girdling; also note cholla in bottom right. M. McClaran photographer, K. Hawkes assistant.

PS. 250. 26 March 2021. 12:30 pm. Facing south, Azimuth 170. Pasture 6A. Elevation 1186 m. ISO 200, 35mm focal length, Canon 5D Mark II Digital Camera. Painted and tagged rebar present, camera above. View is blocked by young mesquite (leaves emerging) that was present at the bottom of the 1949 photo. Comparison with 2015, some branches missing and others show stem girdling; also note cholla in bottom right. M. McClaran photographer, A. Gorlier assistant.

PS. 250. 30 March 2007. Facing south, Azimuth 170. Pasture 6A. Elevation 1186 m. ISO 100, 35mm focal length, Canon 5D Digital Camera. Painted and tagged rebar present, camera 3 m south to avoid young mesquite. No previous photograph from this location. Mesquite alive. About 90% burroweed alive. Cholla and prickly pear cacti present. Bush muhly is dominant grass, also find Lehmann lovegrass, Bouteloua aristidoides, black grama, and threeawns: bush muhly and cottontop under larger mesquite. Compared to 2000, less grass, and prickly pear and cholla are larger. M. McClaran photographer, F. Mashiri assistant.

PS. 250. 19 March 2009. Facing south, Azimuth 170. Pasture 6A. Elevation 1186 m. ISO 100, 35mm focal length, Canon 5D Digital Camera. Painted and tagged rebar present, camera 3 m south to avoid young mesquite. No previous photograph from this location. Mesquite and burroweed alive. Cholla and prickly pear cacti present. Lehmann lovegrass, Bouteloua aristidoides, black grama, and threeawns: bush muhly and cottontop under larger mesquite. Compared to 2007, more grass, especially cottontop and threeawns; cholla and burroweed plants are larger; and small mesquite (25 cm tall) in center foreground (near coyote gourd) is larger; and prickly pear and cholla are larger. M. McClaran photographer, A. Peterson assistant.

PS. 250. 19 March 2015. 1:51 pm. Facing south, Azimuth 170. Pasture 6A. Elevation 1186 m. ISO 400, 35mm focal length, Canon 5D Mark II Digital Camera. Painted and tagged rebar present, camera 3 m south to avoid young mesquite. Mesquite (leaves emerging) and burroweed alive, and zinnia flowering. Cholla and prickly pear cacti present. Lehmann lovegrass, black grama, and threeawns: bush muhly, sideoats, Setaria and cottontop under larger mesquite. Compared to 2009, less grass, especially Lehmann lovegrass; cholla size increase (nearly hiding fence post in photo center; increase in burroweed number and size. M. McClaran photographer, K. Hawkes assistant.

PS. 250. 26 March 2021. 12:39 pm. Facing south, Azimuth 170. Pasture 6A. Elevation 1186 m. ISO 160, 35mm focal length, Canon 5D Mark II Digital Camera. Painted and tagged rebar present, camera 3 m south to avoid young mesquite. Mesquite (leaves emerging) and burroweed, celtis, and zinnia present. Cholla and prickly pear cacti present. Black grama, cottontop and threeawns present in open: bush muhly, sideoats, Setaria and cottontop under larger mesquite. Compared to 2015, more perennial grass; Lehmann lovegrass no longer present in view; cholla and prickly pear size increase; and increase in burroweed. M. McClaran photographer, A. Gorlier assistant.