noaa-lake-19466 Genovesa Crater Lake, Galápagos 400 Year Nitrogen and Carbon Isotope Data Conroy, J.L.; Thompson, D.M.; Collins, A.; Overpeck, J.T.; Bush, M.B.; Cole, J.E.; Anderson, D.J. Genovesa Crater Lake, Galápagos 400 Year Nitrogen and Carbon Isotope Data 2015-11-06 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/19466 Investigator J.L. Conroy Investigator D.M. Thompson Investigator A. Collins Investigator J.T. Overpeck Investigator M.B. Bush Investigator J.E. Cole Investigator D.J. Anderson earth science paleoclimate paleolimnology delta 13C,organic matter,null,per mil VPDB,null,paleolimnology,composited|corrected,isotope ratio mass spectrometry,N,corrected for Suess effect earth science paleoclimate paleolimnology depth,null,null,centimeter,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology nitrogen,sediment,null,percent,null,paleolimnology,null,elemental analysis,N,null earth science paleoclimate paleolimnology delta 13C,organic matter,null,per mil VPDB,null,paleolimnology,corrected,isotope ratio mass spectrometry,N,corrected for Suess effect earth science paleoclimate paleolimnology delta 15N,organic matter,null,per mil AIR,null,paleolimnology,composited,isotope ratio mass spectrometry,N,null earth science paleoclimate paleolimnology delta 15N,organic matter,null,per mil AIR,null,paleolimnology,null,isotope ratio mass spectrometry,N,null earth science paleoclimate paleolimnology age,null,null,year Common Era,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology organic carbon,sediment,null,percent,null,paleolimnology,composited,elemental analysis,N,null earth science paleoclimate paleolimnology nitrogen,sediment,null,percent,null,paleolimnology,composited,elemental analysis,N,null earth science paleoclimate paleolimnology organic carbon,sediment,null,percent,null,paleolimnology,null,elemental analysis,N,null earth science paleoclimate paleolimnology carbon isotopes earth science paleoclimate paleolimnology population abundance geoscientificInformation 1603 AD 2002 AD 347 cal yr BP -52 cal yr BP Complete .33 .33 -89.96 -89.96 0 0 Ocean Pacific Ocean Eastern Pacific Ocean Galapagos Islands Genovesa Crater Lake>LATITUDE .33>LONGITUDE -89.96 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Jessica L. Conroy, Aaron F. Collins, Jonathan T. Overpeck, Mark B. Bush, Julia E. Cole and David J. Anderson 2015 Geo: Geography and Environment 10.1002/geo2.11 http://onlinelibrary.wiley.com/doi/10.1002/geo2.11/abstract

Seabirds play an important role in coastal environments, serving as key indicators of marine ecosystem variability as well as biovectors that influence terrestrial productivity and carbon storage. Long-term estimates of seabird populations remain rare, but lakes that support large seabird populations in their watersheds can archive a history of seabird activity in their sediment records. Here we present a seabird guano-influenced sediment record from Genovesa Crater Lake, Galápagos Islands, home to the world's largest reported colony of red-footed boobies (Sula sula) and smaller populations of other species. Influx of seabird guano into Genovesa Crater Lake produces high sedimentary δ15N values, and temporal variability in sediment δ15N primarily reflects changes in guano influx through time. Two abrupt increases in sedimentary δ15N occurred at 1835 AD and 1965 AD, and variance increased following the 1965 AD shift. The largest of these abrupt shifts at 1835 AD coincided, within age model error, with an abrupt increase in marine productivity indicators in sediment records off the coast of Perú and Chile. In the latter part of the twentieth century, δ15N values increased during periods of higher landings of Peruvian anchoveta and sardines. We hypothesise that seabird presence and activity on Genovesa increased during periods of higher regional marine productivity. Enhanced variance in Genovesa δ15N following the 1965 AD shift may reflect a modern population more susceptible to climate and environmental variability than at any other time in the last 400 years. STUDY NOTES: Sediment nitrogen (d15N) and carbon (d13C) isotope record from Genovesa Crater Lake, Galápagos for the past 400 years

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015lg1.txt Data File; Genovesa Crater Lake Core LG-1 Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015compiso.txt Data File; Genovesa Crater Lake Composite Nitrogen and Carbon Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015gu1.txt Data File; Genovesa Crater Lake Core GU-1 Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015gu6.txt Data File; Genovesa Crater Lake Core GU-6 Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015comppol.txt Data File; Genovesa Crater Lake Composite Pollen Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015gen6.txt Data File; Genovesa Crater Lake Core GEN-6 Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11