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The Carbon Stable Isotope Composition of Pollen Review of Palaeobotany and Palynology 132 (2004) 291–313 www.elsevier.com/locate/revpalbo The carbon stable isotope composition of pollen A. Hope Jahren* Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD 21218, USA Received 12 June 2003; accepted 26 August 2004 Abstract The d13C value of plant tissue is increasingly used to infer environmental and ecological conditions in modern and ancient environments. Isolation techniques and morphological descriptions have been established that characterize plant pollen for the greater part of the Phanerozoic eon. If the d13C value of fossil pollen could be used as an indicator of the carbon isotope composition of ancient pollinating communities, it could provide insight into ancient paleoenvironments. Previous studies have revealed a correlation between the d13C value of pollen and the d13C value of bulk plant tissue in a few isolated species; this study sought to quantify the isotopic relationship between modern pollen and stem and leaf tissues across all the major phylogenetic clades of the tracheophytes. One-hundred and seventy-five different species of tracheophytes were collected from 11 arboreta and botanical gardens across the United States and analyzed for d13C value of pollen, leaf, and stem tissue. The carbon isotope difference between pollen and leaf tissue values in the same species was =F3.00x for N90% of data pairs, and the same relationship was true for comparisons between pollen and stem tissue. When the data was examined by phylogenetic clade, it was found that some groups, such as the Cornales and Ericales, exhibited a much closer and more consistent correlation 13 13 between pollen and stem and leaf tissue. It was also noted that green-stemmed clades tended to show d Cstembd Cpollen while 13 13 woody-stemmed clades showed the opposite (d Cpollenbd Cstem), a difference attributable to the different chemical composition of the two types of stem tissue. The chemical preparation method involving Schulze’s solution that is commonly employed to isolate pollen from pre-Quaternary sediments was shown not to affect the carbon isotope composition of pollen by more than 0.23x. The manual isolation of sufficient pollen from the fossil record for d13C analysis of a single species would be prohibitively laborious; however, these results showed that when understood in terms of paleobotanical taxonomy, d13C analyses of bulk fossil pollen can be used to infer the d13C value of the ancient plant community to within 1.5x. D 2004 Elsevier B.V. All rights reserved. Keywords: pollen; carbon stable isotopes; palynology; palaeobotany 1. Introduction Analysis of the carbon stable isotope composition of plant tissues and plant compounds has a myriad of * Tel.: +1 410 516 7134; fax: +1 410 516 7933. applications spanning biology, ecology, and geology. 13 E-mail address: [email protected]. The d C value of modern and fossil plant compo- 0034-6667/$ - see front matter D 2004 Elsevier B.V. All rights reserved. doi:10.1016/j.revpalbo.2004.08.001 292 A. Hope Jahren / Review of Palaeobotany and Palynology 132 (2004) 291–313 nents has been used to elucidate environmental al. (2001) reported the d13C values of pollen from 33 conditions and relationships in current (reviewed in species of trees, herbs, and grasses; Loader and Dawson et al., 2002), as well as ancient (reviewed in Hemming (2000) reported the d13C values of pollen Beerling and Royer, 2002), ecosystems. Many recent from five species of plants; Loader and Hemming publications describe the use of carbon stable isotopes (2001) reported an in-depth study of the d13C value to gain a diverse array of insights into plant of modern Pinus sylvestris (Pinaceae) and its communities. Some examples in modern plant eco- relationship to the climate environment of pollen systems include the use of plant tissue d13C value to production. This study sought to characterize the determine C3 vs. C4 photosynthetic pathway in d13C value of modern pollen from all the major monocots (Li et al., 1999), to discern the recycling tracheophyte clades, and to quantify the general of CO2 within ecosystems (Buchmann et al., 2002; isotopic relationship between pollen and other plant Sternberg and DeAngelis, 2002), to follow the tissues. If the claim that the d13C value of pollen is incorporation of plant matter into soil (Baisden et bclosely relatedQ to that of the parent plant tissue al., 2002), to elucidate plant water stress (Ward et al., (page 19 of Amundson et al., 1997) holds true for all 2002), and to compare plant intercellular CO2 con- tracheophytes, pollen could be established as an centration between species in the same environment isotopic substrate and used to elucidate environ- (Sandquist and Ehleringer, 2003). Similarly, the recent mental conditions in both modern and ancient literature reveals the broad application of carbon ecosystems through the wealth of applications dis- stable isotope analysis of plant tissues to problems cussed above. in paleoclimatology; plant fossil material d13C value has been used to determine the shifts from C3 to C4 vegetation in ancient environments (Scott, 2002) and Table 1 to infer changes in the climate environment that Botanical gardens and arboreta of collection caused such shifts (Boom et al., 2002; Nordt et al., Site Site Location Average 2002). The d13C value of fossil terrestrial organic abbreviation April–May a material has also been used to quantify changes in the temperature (8C) carbon isotope composition of CO2 (Arens and Jahren, 2000; Hasegawa et al., 2003; Jahren, 2002), ASU The Arboretum at 33814VN 21.1 V and to identify what type of photosynthetic organism Arizona State University 11281 W ATH The State Botanical 33839VN 18.3 a fossil once was (Jahren et al., 2003). Garden of Georgia 84826VW A particularly long and rich history exists in the ATL The Atlanta Botanical 33857VN 19.2 morphological characterization and taxonomic sys- Garden 83819VW tematization of pollen (Jones and Rowe, 1999; BTA Boyce Thompson 33826VN 21.4 V Traverse, 1988). Plant pollen can be retrieved from Arboretum State Park 112814 W JHU The Johns Hopkins 39811VN 15.6 the fossil record for the entire 400+ million year University Campus 76840VW history of plant macrofossil assemblages; moreover, MA Morris Arboretum 39853VN 13.5 plant pollen appears in the fossil record many 75815VW millions of years before plant macrofossils can be MIN Minnesota Landscape 44853VN 12.0 V found (Strother, 2000). In addition, pollen is Arboretum 93813 W NA The United States 38851VN 15.6 commonly isolated from various sediments, analyzed National Arboretum 7782VW for its morphology, and archived. All of these NCA The North Carolina 35826VN 15.8 attributes recommend pollen as an ideal plant–tissue Arboretum 82832VW substrate for carbon isotope analysis. However, to TBG Tucson Botanical 3287VN 21.9 V date, only a handful of studies have examined the Gardens 110856 W WPA Washington Park 47832VN 11.6 carbon stable isotope composition of pollen, and Arboretum 112818VW these studies have focused on a few plant families. a 13 Average monthly temperatures for the months of April plus Amundson et al. (1997) reported the d C values of May based on 90+ years of annual records (Spangler and Jenne, pollen from 11 species of Poaceae; Descolas-Gros et 1990). A. Hope Jahren / Review of Palaeobotany and Palynology 132 (2004) 291–313 293 2. Methods and materials sota, Pennsylvania, Washington, and in Washington, DC. Site conditions spanned a large variety of Plant tissue and pollen samples were collected climates, with average April–May temperatures from mature plants at 11 arboreta and botanical ranging from 11.6 to 21.9 8C. At these particular gardens during late May of 2000, 2001, and 2002 arboreta and gardens, all sampled plants were under (Table 1). Sites of collection were located in the the care of arboretum and botanical garden staff, U.S. states of Arizona, Georgia, Maryland, Minne- and were offered optimal amounts of water and Table 2 Stable carbon isotope composition of pollen, leaf, and stem tissues from gymnosperm plants Plant species Common name Pollen d13C d13C Stem d13C Sitea (x)(x)(x) collected Ginkgophyta Family Ginkgoaceae Ginkgo biloba Maidenhair tree À25.59 À25.54 À26.43 MA Coniferophyta Family Cupressaceae Cupressus arizonica Arizona cypress À25.33 À27.14 À25.50 BTA Cupressus sempervirens Italian cypress À24.63 À25.26 À23.16 BTA Juniperus scopulorum Rocky mountain juniper À23.54 À25.26 À23.35 BTA Family Pinaceae Abies amabilis Pacific silver fir À26.42 À26.73 À25.53 MA Abies bracteata Bristlecone fir À25.87 À29.83 À27.13 MA Abies bracteata Bristlecone fir À25.54 À28.26 À24.90 NA Abies concolor White fir À28.16 À28.50 À27.37 MA Abies lasiocarpa Subalpine fir À28.25 À28.45 À27.39 MA Cedrus atlantica Atlas cedar À31.00 À31.14 À29.18 NA Cedrus libani Cedar of Lebanon À27.12 À31.09 À28.32 MA Larix decidua European larch À27.21 À28.06 À27.24 WPA Larix kaempferi Japanese larch À26.38 À26.99 À25.88 MA Picea abies Norway spruce À26.78 À28.72 À26.09 NA Picea abies Norway spruce À28.29 À27.03 À26.31 WPA Picea glauca White spruce À25.96 À26.02 À24.97 NA Picea mariana Black spruce À25.86 À26.87 À24.69 MA Picea sitchensis Sitka spruce À25.88 À27.43 À25.23 MA Picea sitchensis Sitka spruce À27.81 À27.35 À27.47 NA Pinus brutia Eldarica pine À28.70 À27.57 À26.20 BTA Pinus brutia Eldarica pine À28.40 À28.53 À25.68 ASU Pinus canariensis Canary Island pine À24.24 À24.53 À24.09 ASU Pinus echinata Shortleaf pine À30.20 À30.01 À28.32 ATH Pinus eldarica
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