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. Conroy, J.L. Thompson, D.M. Collins, A. Overpeck, J.T. Bush, M.B. Cole, J.E. Anderson, D.J. 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 earth science/paleoclimate/paleolimnology (Genovesa Crater Lake>LATITUDE .33>LONGITUDE -89.96) 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 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Conroy, J.L. Investigator : Thompson, D.M. Investigator : Collins, A. Investigator : Overpeck, J.T. Investigator : Bush, M.B. Investigator : Cole, J.E. Investigator : Anderson, D.J. 2015-11-06 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/19466 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015lg1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015compiso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015gu1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015gu6.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015comppol.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015gen6.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015lg1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015compiso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015gu1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015gu6.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015comppol.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015gen6.txt English https://www.ncdc.noaa.gov/paleo/study/19466 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015lg1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015compiso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015gu1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015gu6.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015comppol.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015gen6.txt Jessica L. Conroy, Aaron F. Collins, Jonathan T. Overpeck, Mark B. Bush, Julia E. Cole and David J. Anderson2015A 400-year isotopic record of seabird response to eastern tropical Pacific productivityGeo: Geography and Environment10.1002/geo2.11http://onlinelibrary.wiley.com/doi/10.1002/geo2.11/abstract START YEAR: 1603 AD * END YEAR: 2002 AD -89.96 .33 -89.96 .33