title: Glacial trees from the La Brea tar pits show physiological constraints of low CO₂.
abstract: • While studies of modern plants indicate negative responses to low [CO₂] that occurred during the last glacial period, studies with glacial plant material that incorporate evolutionary responses are rare. In this study, physiological responses to changing [CO₂] were compared between glacial (La Brea tar pits) and modern Juniperus trees from southern California. • Carbon isotopes were measured on annual rings of glacial and modern Juniperus. The intercellular:atmospheric [CO₂] ratio (c(i) /c(a) ) and intercellular [CO₂] (c(i) ) were then calculated on an annual basis and compared through geologic time. • Juniperus showed constant mean c(i) /c(a) between the last glacial period and modern times, spanning 50,000 yr. Interannual variation in physiology was greatly dampened during the last glacial period relative to the present, indicating constraints of low [CO₂] that reduced responses to other climatic factors. Furthermore, glacial Juniperus exhibited low c(i) that rarely occurs in modern trees, further suggesting limiting [CO₂] in glacial plants. • This study provides some of the first direct evidence that glacial plants remained near their lower carbon limit until the beginning of the glacial-interglacial transition. Our results also suggest that environmental factors that dominate carbon-uptake physiology vary across geologic time, resulting in major alterations in physiological response patterns through time.
authors.affiliation: Department of Ecology and Evolutionary Biology, University of Kansas, 1200 Sunnyside Avenue, Lawrence, KS 66045, USA.
authors.forename: Laci M
authors.initials: LM
authors.lastname: Gerhart
authors.affiliation: George C. Page Museum at the La Brea Tar Pits, Natural History Museum of Los Angeles County, 5801 Wilshire Blvd, Los Angeles, CA 90036, USA.
authors.forename: John M
authors.initials: JM
authors.lastname: Harris
authors.affiliation: Division of Biology, Kansas State University, 116 Ackert Hall, Manhattan, KS 66506, USA.
authors.forename: Jesse B
authors.initials: JB
authors.lastname: Nippert
authors.affiliation: Department of Biological Science, California State University, 800 N. State College, Fullerton, CA 92834, USA.
authors.forename: Darren R
authors.initials: DR
authors.lastname: Sandquist
authors.affiliation: Department of Ecology and Evolutionary Biology, University of Kansas, 1200 Sunnyside Avenue, Lawrence, KS 66045, USA.
authors.forename: Joy K
authors.initials: JK
authors.lastname: Ward
mesh_terms: D001272:Atmosphere; D002245:Carbon Dioxide / Q000494:pharmacology*; D002247:Carbon Isotopes; D002980:Climate; D046448:Ice Cover; D007553:Isotope Labeling; D018653:Juniperus / Q000187:drug effects* / Q000502:physiology*; D015141:Los Angeles; D013638:Tars; D014197:Trees / Q000187:drug effects* / Q000502:physiology*
chemical_list: D002247:Carbon Isotopes; D013638:Tars; D002245:Carbon Dioxide