Editing Isotope analysis (section)

=====Hydrogen-2=====

The ratio of <sup>2</sup>H, also known as [[deuterium]], to <sup>1</sup>H has been studied in both plant and animal tissue. Hydrogen isotopes in plant tissue are correlated with local water values but vary based on fractionation during [[photosynthesis]], transpiration, and other processes in the formation of cellulose. A study on the isotope ratios of tissues from plants growing within a small area in Texas found tissues from [[CAM photosynthesis|CAM]] plants were enriched in deuterium relative to [[C4 carbon fixation|C4]] plants.<ref>{{cite journal|last1=Sternberg|first1=Leonel|last2=DeNiro|first2=Michael|last3=Johnson|first3=Hyrum|date=1984|title=Isotope ratios of cellulose from plants having different photosynthetic pathways|url=http://www.plantphysiol.org/content/plantphysiol/74/3/557.full.pdf|journal=Plant Physiology|volume=74|issue=3|pages=557–561|doi=10.1104/pp.74.3.557|pmc=1066725|pmid=16663460|access-date=15 March 2019|doi-access=free}}</ref> Hydrogen isotope ratios in animal tissue reflect diet, including drinking water, and have been used to study bird migration<ref>{{cite journal|last1=Kelly|first1=Jeffrey F.|last2=Atudorei|first2=Viorel|last3=Sharp|first3=Zachary D.|last4=Finch|first4=Deborah M.|date=1 January 2002|title=Insights into Wilson's Warbler migration from analyses of hydrogen stable-isotope ratios|journal=Oecologia|volume=130|issue=2|pages=216–221|bibcode=2002Oecol.130..216K|doi=10.1007/s004420100789|pmid=28547144|s2cid=23355570}}</ref> and aquatic food webs.<ref>{{cite journal|last1=Doucett|first1=Richard R.|last2=Marks|first2=Jane C.|last3=Blinn|first3=Dean W.|last4=Caron|first4=Melanie|last5=Hungate|first5=Bruce A.|date=June 2007|title=Measuring Terrestrial Subsidies to Aquatic Food Webs Using Stable Isotopes of Hydrogen|journal=Ecology|volume=88|issue=6|pages=1587–1592|doi=10.1890/06-1184|pmid=17601150|bibcode=2007Ecol...88.1587D }}</ref><ref>{{cite journal|last1=Cole|first1=Jonathan J.|last2=Carpenter|first2=Stephen R.|last3=Kitchell|first3=Jim|last4=Pace|first4=Michael L.|last5=Solomon|first5=Christopher T.|last6=Weidel|first6=Brian|date=1 February 2011|title=Strong evidence for terrestrial support of zooplankton in small lakes based on stable isotopes of carbon, nitrogen, and hydrogen|journal=Proceedings of the National Academy of Sciences|volume=108|issue=5|pages=1975–1980|bibcode=2011PNAS..108.1975C|doi=10.1073/pnas.1012807108|pmc=3033307|pmid=21245299|doi-access=free}}</ref>