# Genovesa Crater Lake, Galapagos 400 Year Nitrogen and Carbon Isotope Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, title, online resource and date accessed. # # Description/Documentation lines begin with # # Data lines have no # # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/19466 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/galapagos/genovesa2015compiso.txt # # Archive: Paleolimnology # # Parameter_Keywords: geochemistry, carbon isotopes #--------------------------------------- # Contribution_Date # Date: 2015-11-06 #--------------------------------------- # Title # Study_Name: Genovesa Crater Lake, Galapagos 400 Year Nitrogen and Carbon Isotope Data #--------------------------------------- # Investigators # Investigators: Conroy, J.L.; Thompson, D.M.; Collins, A.; Overpeck, J.T.; Bush, M.B.; Cole, J.E.; Anderson, D.J. #--------------------------------------- # Description and Notes # Description: Sediment nitrogen (d15N) and carbon (d13C) isotope record from Genovesa Crater Lake, Galapagos for the past 400 years. # Provided Keywords: #--------------------------------------- # Publication # Authors: Jessica L. Conroy, Aaron F. Collins, Jonathan T. Overpeck, Mark B. Bush, Julia E. Cole and David J. Anderson # Published_Date_or_Year: 2015-09-28 # Published_Title: A 400-year isotopic record of seabird response to eastern tropical Pacific productivity # Journal_Name: Geo Geography and Environment # Volume: # Issue: # Pages: # Online_Resource: http://onlinelibrary.wiley.com/doi/10.1002/geo2.11/abstract # Report Number: # 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, Galapagos 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 d15N values, and temporal variability in sediment d15N primarily reflects changes in guano influx through time. Two abrupt increases in sedimentary d15N 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 Peru and Chile. In the latter part of the twentieth century, d15N 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 d15N 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. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: NSF-RAPID-1256970, NSF-0957881 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: US National Oceanic and Atmospheric Administration # Grant: NA07OAR4310058 #--------------------------------------- # Site Information # Site_Name: Genovesa Crater Lake # Location: Ocean>Pacific Ocean>Eastern Pacific Ocean>Galapagos Islands # Country: Ecuador # Northernmost_Latitude: 0.33 # Southernmost_Latitude: 0.33 # Easternmost_Longitude: -89.96 # Westernmost_Longitude: -89.96 # Elevation: 0 m #--------------------------------------- # Data_Collection # Collection_Name: Genovesa2015compiso # First_Year: 1605 # Last_Year: 2002 # Time_Unit: AD # Core_Length: # Notes: #------------------ # Chronology_Information # Chronology: # Radiocarbon Ages # core Sample Description Depth (cm rel GU-6) Lab number d13C (per mil) FMC 14C age (years) cal yrs error 1s # GU-6 210Pb 0.9 -51.4 8.1 # GU-6 210Pb 2.3 -48.9 8.4 # GU-6 210Pb 3.0 -46.1 8.9 # GU-6 210Pb 4.1 -37.9 10.8 # GU-6 210Pb 4.9 -28.4 13.5 # GU-6 210Pb 6.4 -25.7 13.8 # GU-6 210Pb 7.9 -14.5 17.9 # GU-6 137Cs 7.9 -13.0 1.0 # GU-6 210Pb 9.4 -10.0 19.6 # GU-6 210Pb 10.9 4.7 29.5 # GU-6 210Pb 12.4 9.4 30.5 # GU-6 210Pb 13.9 23.8 39.0 # GU-6 210Pb 15.4 30.4 35.6 # GU-7 mangrove leaf 47 AA66663 -23.3 0.9646+/-0.0045 289+/-38 # GU-7 mangrove leaf 52 AA91765 -25 0.9608+/-0.0054 321+/-45 # GU-7 mangrove leaf 54 AA66664 -23.6 0.9407+/-0.0045 491+/-39 # #--------------------------------------- # Variables # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # ## age_AD age,,,year AD,,,,,N ## corg% Organic carbon percent,sediment,,%,,Paleolimnology,,elemental analysis,N ## N% Nitrogen total percent abundance, sediment,,%,,Paleolimnology,,elemental analysis,N ## d13CborgVPDB delta13C bulk organic,sediment,,per mil VPDB,,Paleolimnology, Suess corrected composite,isotope ratio mass spectrometry,N ## d15Norg delta15N organic,sediment,,per mil air,,Paleolimnology,,isotope ratio mass spectrometry,N # #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: # Core composite isotope data # age_AD corg% N% d13CborgVPDB d15Norg 2002.5 10.8 1 -17.459 24.2 1999.3 8.2 0.9 -17.174 24.6 1996.9 8.7 1 -15.655 22.5 1995.3 10.7 1.1 -14.606 22.9 1993.8 8.7 0.7 -14.056 25.2 1992.3 8.1 0.6 -14.705 25.2 1990.7 9.6 0.7 -15.953 26.7 1989.1 10.1 0.8 -16 25.9 1987.6 10.7 0.9 -16.046 27.8 1986 7.6 0.7 -16.69 24.2 1984.5 7 0.7 -16.333 24 1982.6 9.8 0.9 -16.284 24.9 1980.1 7.8 0.8 -16.848 24.6 1977.5 8 0.8 -16.013 24.3 1974.9 8.1 0.9 -14.975 24 1972.3 9.8 1 -14.834 25.4 1969.7 11.5 1.2 -15.889 27.5 1967.2 8.6 0.9 -17.441 28.4 1964.6 9.7 1.3 -19.191 24.4 1962.1 12.5 1.5 -20.738 19.2 1959.5 10 1 -20.083 17.7 1957 15.1 1.5 -18.625 17.9 1954.4 13.4 1.5 -17.965 19.5 1951.9 6.9 0.8 -17.502 18.8 1949.3 8.7 1 -16.538 19.7 1946.8 7.4 0.9 -15.471 19.9 1944.3 11 1.2 -15.701 19.3 1941.9 9 1 -15.729 18.9 1939.6 8.6 1 -15.155 20.2 1937.3 11.2 1.3 -15.178 20.6 1935.1 10 0.9 -14.5 20.3 1932.8 11.7 1 -14.72 19.6 1930.6 10 0.8 -15.039 20.7 1928.3 10.5 0.9 -14.657 20.5 1926.1 11.8 1 -14.974 19.6 1923.8 10 0.9 -15.089 19.7 1921.5 10.2 0.8 -14.704 19.7 1919 12.5 1 -14.719 20.3 1915.9 11.9 0.9 -14.436 20.1 1912.1 9.7 0.8 -15.354 19.3 1907.5 12.24 1.09 -12.532 19.79 1902.3 11.33 0.92 18.89 1897.3 10.255 0.875 -13.833 19.96 1892.7 10.55 0.785 -14.698 20.355 1888.3 10.47 0.77001 -14.001 21.5 1884 11.775 0.99495 -12.628 21.645 1879.8 10.814 0.87 -13.278 20.051 1875.5 10.359 0.90769 -13.839 21.181 1871 10.202 1.0971 -13.681 20.758 1865.3 11.654 0.8949 -14.252 22.56 1859.7 10.502 0.87971 -14.743 21.288 1854.1 10.7 0.84501 -15.544 21.75 1848.4 11.67 0.91584 -14.321 22.08 1843 12.434 0.94335 -13.694 21.949 1837.7 11.078 0.81114 -12.399 22.4 1832.7 9.9605 0.74081 -12.481 14.663 1827.6 9.95 0.73763 -12.762 14.158 1822.6 10.349 0.79295 -14.113 14.076 1817.5 9.761 0.79057 -14.328 14.094 1811.7 9.756 0.80002 -13.164 14.497 1805.9 10 0.83 -14.756 14.05 1800.2 10.33 0.75 -12.6 14.3 1794.5 10.6 0.84 -12.3 15.6 1788.6 7.57 0.57 -12.4 14.9 1782.7 9.79 0.78 -13.7 15.5 1777 10.09 0.81 -13.4 16.3 1771.5 8.25 0.76 -12.2 16.4 1766.2 9.18 0.75 -12.5 13.7 1760.8 8.54 0.65 -13.9 11.7 1755.1 8.41 0.72 -12.2 13.7 1749.1 8.17 0.7 -13.8 12.1 1742.8 8.52 0.63 -12.6 13 1736.5 9.35 0.67 -14 11.9 1730.1 9.82 0.75 -15.4 11.7 1723.8 8.94 0.67 -13.3 12.6 1717.9 9.44 0.79 -14.1 13.5 1712.1 8.88 0.69 -13.8 12.9 1706.3 8.04 0.62 -14.1 12.1 1700.6 9.47 0.67 -13.5 12.1 1694.7 9.18 0.64 -13.6 11.3 1688.9 8.41 0.66 -13.5 11.8 1683.3 9.08 0.69 -13.2 12.3 1677.6 9.87 0.77 -13 13.4 1671.4 8.45 0.65 -13.4 11.5 1665.2 9.15 0.72 -12.9 13.1 1659.1 10.14 0.79 -13.1 12.1 1653 11.25 0.82 -13 12.3 1647.2 10.29 0.73 -14.1 12.3 1641.4 9.3 0.67 -13.1 13.1 1635.4 10.12 0.8 -14.4 14.1 1629.4 10.26 0.78 -12.4 13.4 1623.6 10.37 0.69 -14.2 12.3 1617.7 10.9 0.65 -14.6 12.7 1611.4 11.03 0.71 -15 13.3 1605.1 11.38 0.96 -15.8 13.3