pub1_author: 'list(list(name = "Hodell, David A."), list(name = "Curtis, Jason H."), list(name = "Brenner, Mark"))' has been replaced by 'Hodell, David A.'

d18O (GHb76f6725): paleoData_proxyGeneral: '' has been replaced by 'isotope'

Possible role of climate in the collapse of Classic Maya civilization

pinyon curve is a good approximate of changes in winter precipitation.

Indication for the position of upper treeline

This pollen ratio time series was generated for the wNAm database.

Ratio to relative shifts between the subalpine and the lower altitudinal steppe vegetation belts. A proxy for the elevation of treeline and the density of Picea subalpine forest

Indication for the position of lower treeline

Picea (WEB29314f16): interpretation1_scope: '' has been replaced by 'climate'
Artemesia (WEB5e7cc8d6): interpretation1_scope: '' has been replaced by 'climate'
PinusTotal (WEB65ba94d8): interpretation1_scope: '' has been replaced by 'climate'

pub1_author: 'list(list(name = "Anderson, R. Scott"), list(name = "Jass, Renata B."), list(name = "Toney, Jaime L."), list(name = "Allen, Craig D."), list(name = "Cisneros-Dozal, Luz M."), list(name = "Hess, Marcey"), list(name = "Heikoop, Jeff"), list(name = "Fessenden, Julianna"))' has been replaced by 'Anderson, R. Scott'

Development of the mixed conifer forest in northern New Mexico and its relationship to Holocene environmental change

<jats:p>Chihuahueños Bog (2925 m) in the Jemez Mountains of northern New Mexico contains one of the few records of late-glacial and postglacial development of the mixed conifer forest in southwestern North America. The Chihuahueños Bog record extends to over 15,000 cal yr BP. An<jats:italic>Artemisia</jats:italic>steppe, then an open<jats:italic>Picea</jats:italic>woodland grew around a small pond until ca. 11,700 cal yr BP when<jats:italic>Pinus ponderosa</jats:italic>became established. C/N ratios,<jats:italic>δ</jats:italic><jats:sup>13</jats:sup>C and<jats:italic>δ</jats:italic><jats:sup>15</jats:sup>N values indicate both terrestrial and aquatic organic matter was incorporated into the sediment. Higher percentages of aquatic algae and elevated C/N ratios indicate higher lake levels at the opening of the Holocene, but a wetland developed subsequently as climate warmed. From ca. 8500 to 6400 cal yr BP the pond desiccated in what must have been the driest period of the Holocene there. C/N ratios declined to their lowest Holocene levels, indicating intense decomposition in the sediment. Wetter conditions returned after 6400 cal yr BP, with conversion of the site to a sedge bog as groundwater levels rose. Higher charcoal influx rates after 6400 cal yr BP probably result from greater biomass production rates. Only minor shifts in the overstory species occurred during the Holocene, suggesting that mixed conifer forest dominated throughout the record.</jats:p>