# Ranobe, Madagascar Late Holocene Lake Sediment Ostracod Records #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 4.0 # Encoding: UTF-8 # NOTE: Please cite original publication, NOAA Landing Page URL, dataset and publication DOIs (where available), and date accessed when using downloaded data. # If there is no publication information, please cite investigator, study title, NOAA Landing Page URL, and date accessed. # # Description/Documentation lines begin with '#' followed by a space # Data lines have no '#' # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/37079 # Landing_Page_Description: NOAA Landing Page of this file's parent study, which includes all study metadata. # # Study_Level_JSON_Metadata: https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/json/noaa-Paleolimnology-37079.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Paleolimnology # # Dataset_DOI: 10.25921/dcew-3g15 # # Science_Keywords: other hydroclimate reconstruction, tropics, biogeochemical cycles, centennial resolution, drought #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/paleolimnology/africa/eastafrica/hixon2021-ranobe_25-ix-17.txt # Data_Download_Description: NOAA Template File; Ostracod Geochemical Data # #--------------------------------------- # Contribution_Date # Date: 2022-11-22 #--------------------------------------- # File_Last_Modified_Date # Date: 2023-03-10 #--------------------------------------- # Title # Study_Name: Ranobe, Madagascar Late Holocene Lake Sediment Ostracod Records #--------------------------------------- # Investigators # Investigators: Hixon, S.W.(0000-0001-6147-7118); Curtis, J.(0000-0003-0884-9941); Brenner, M.; Douglass, K.G.; Domic, A.I.; Culleton, B.J.; Ivory, S.J. (0000-0003-4709-4406); Kennett, D.J. #--------------------------------------- # Description_Notes_and_Keywords # Description: #--------------------------------------- # Publication # Authors: Hixon, S.W., Curtis, J., Brenner, M., Douglass, K.G., Domic, A.I., Culleton, B.J., Ivory, S.J. and Kennett, D.J. # Published_Date_or_Year: 2021-09-01 # Published_Title: Drought Coincided with, but Does Not Explain, Late Holocene Megafauna Extinctions in SW Madagascar # Journal_Name: MDPI Climate # Volume: 9 # Edition: # Issue: 9 # Pages: # Report_Number: 138 # DOI: 10.3390/cli9090138 # Online_Resource: # Full_Citation: # Abstract: Climate drying could have transformed ecosystems in southern Madagascar during recent millennia by contributing to the extinction of endemic megafauna. However, the extent of regional aridification during the past 2000 years is poorly known, as are the responses of endemic animals and economically important livestock to drying. We inferred ~1600 years of climate change around Lake Ranobe, SW Madagascar, using oxygen isotope analyses of monospecific freshwater ostracods (Bradleystrandesia cf. fuscata) and elemental analyses of lake core sediment. We inferred past changes in habitat and diet of introduced and extinct endemic megaherbivores using bone collagen stable isotope and 14C datasets (n = 63). Extinct pygmy hippos and multiple giant lemur species disappeared from the vicinity of Ranobe during a dry interval ~1000–700 cal yr BP, but the simultaneous appearance of introduced cattle, high charcoal concentrations, and other evidence of human activity confound inference of drought-driven extirpations. Unlike the endemic megafauna, relatively low collagen stable nitrogen isotope values among cattle suggest they survived dry intervals by exploiting patches of wet habitat. Although megafaunal extirpations coincided with drought in SW Madagascar, coupled data from bone and lake sediments do not support the hypothesis that extinct megafauna populations collapsed solely because of drought. Given that the reliance of livestock on mesic patches will become more important in the face of projected climate drying, we argue that sustainable conservation of spiny forests in SW Madagascar should support local livelihoods by ensuring that zebu have access to mesic habitat. Additionally, the current interactions between pastoralism and riparian habitats should be studied to help conserve the island’s biodiversity. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation # Grant: GRFP-2015213455, DDRI-1838393, IES-1840968 #--------------------------------------- # Site_Information # Site_Name: Ranobe # Location: Madagascar # Northernmost_Latitude: -23.0312 # Southernmost_Latitude: -23.0312 # Easternmost_Longitude: 43.60483 # Westernmost_Longitude: 43.60483 # Elevation_m: 20 #--------------------------------------- # Data_Collection # Collection_Name: Ranobe_25-IX-17 # First_Year: 1700 # Last_Year: -50 # Time_Unit: cal yr BP # Core_Length_m: 235 # Parameter_Keywords: carbon isotopes, oxygen isotopes, physical properties # Notes: The publication includes additional datasets from the study site (e.g., acidified sediment delta 15N data, bulk sediment weight percent CaCO3, and terrestrial animal collagen delta 13C and delta 15N data). #--------------------------------------- # Chronology_Information # Chronology: # # Paste Measured Radiocarbon Ages into a table below. Ages from other sources can be included using the depth, calib.14C, and notes columns # Labcode sample identification used by 14C laboratory # depth_top Depth top of sample interval (cm) # depth_bottom Depth bottom of sample interval (cm) # mat.dated Material Dated # 14C.raw conventional radiocarbon age, years before 1950AD # 14C.raw_err radiocarbon age, standard error # datemeth Dating method # reservoir Reservoir correction # delta-R Deviation from global mean reservoir correction # delta-R_err_lo delta-R standard error down # delta-R_err_up delta-R standard error up # calib.14C Calibrated age # calib.14C_1sig_lo Calibrated age, 1-sigma lower confidence bound # calib.14C_1sig_up Calibrated age, 1-sigma upper confidence bound # calib.14C_2sig_lo Calibrated age, 2-sigma lower confidence bound # calib.14C_2sig_up Calibrated age, 2-sigma upper confidence bound # calib_method Calibration method # rejected Rejected sample (yes/no) # notes Notes # # Labcode depth_top depth_bottom mat.dated 14C.raw 14C.raw_err datemeth reservoir delta-R delta-R_err_lo delta-R_err_up calib.14C calib.14C_2sig_lo calib.14C_2sig_up calib_method rejected notes # PSUAMS-5151 26 28 3 twig fragments, unidentified 85 15 14C AMS NaN NaN NaN NaN 54 132 26 OxCal 4.4 using SHCal20 NaN NaN # PSUAMS-5152 48 50 2 seed fragments, unidentified 335 20 14C AMS NaN NaN NaN NaN 382 444 303 OxCal 4.4 using SHCal20 NaN NaN # PSUAMS-5315 82 83 2 seed fragments, possibly emergent plant (maybe Juncaceae) 600 15 14C AMS NaN NaN NaN NaN 560 627 530 OxCal 4.4 using SHCal20 NaN NaN # PSUAMS-5153 115 116 seed, aquatic plant (Najas sp.) 1560 15 14C AMS NaN NaN NaN NaN 1392 1450 1323 OxCal 4.4 using SHCal20 YES NaN # PSUAMS-3523 126 126 charcoal fragments, unidentified 600 20 14C AMS NaN NaN NaN NaN 564 627 528 OxCal 4.4 using SHCal20 NaN NaN # PSUAMS-6328 126 127 charcoal fragments, unidentified 460 20 14C AMS NaN NaN NaN NaN 480 511 340 OxCal 4.4 using SHCal20 NaN NaN # PSUAMS-6334 126 127 ostracod, Bradleystrandesia cf. fuscata 650 20 14C AMS NaN NaN NaN NaN 601 645 549 OxCal 4.4 using SHCal20 NaN NaN # PSUAMS-6306 126 127 2 seed fragments, unidentified 795 20 14C AMS NaN NaN NaN NaN 691 725 662 OxCal 4.4 using SHCal20 NaN NaN # PSUAMS-5154 155 156 4 seeds, possibly emergent plant (maybe Juncaceae) 1325 15 14C AMS NaN NaN NaN NaN 1228 1271 1176 OxCal 4.4 using SHCal20 NaN NaN # PSUAMS-5155 180 181 2 seed fragments + 1 charcoal fragment, aquatic plant (Najas sp. & Potamogetonaceae) 1875 25 14C AMS NaN NaN NaN NaN 1769 1828 1705 OxCal 4.4 using SHCal20 YES NaN # PSUAMS-5316 200 201 4 seed fragments, unidentified 1695 20 14C AMS NaN NaN NaN NaN 1555 1610 1489 OxCal 4.4 using SHCal20 NaN NaN # PSUAMS-5317 220 221 2 seed fragments, possibly aquatic plant (maybe Potamogetonaceae) 1480 20 14C AMS NaN NaN NaN NaN 1331 1362 1301 OxCal 4.4 using SHCal20 NaN NaN # PSUAMS-6329 231 232 likely charcoal fragments from washed material 915 25 14C AMS NaN NaN NaN NaN 777 900 726 OxCal 4.4 using SHCal20 YES NaN # PSUAMS-3522 233 233 mixed organics, small fragments unidentified 1435 25 14C AMS NaN NaN NaN NaN 1299 1352 1188 OxCal 4.4 using SHCal20 YES NaN # PSUAMS-6332 233 234 ratite eggshell carbonate, Mullerornis modestus 1775 20 14C AMS NaN NaN NaN NaN 1647 1701 1588 OxCal 4.4 using SHCal20 NaN NaN # #--------------------------------------- # Variables # PaST_Thesaurus_Download_Resource: https://www.ncei.noaa.gov/access/paleo-search/skos/past-thesaurus.rdf # PaST_Thesaurus_Download_Description: Paleoenvironmental Standard Terms (PaST) Thesaurus terms, definitions, and relationships in SKOS format. # # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-var components: what, material, error, units, seasonality, data type, detail, method, C or N for Character or Numeric data) # ## depth_cm depth,,,centimeter,,Paleolimnology ,,,N, ## age_BP age,,,calendar year before present,,Paleolimnology ,,,N, ## d13Costracod delta 13C,ostracod,,per mil VPDB,,Paleolimnology ,,isotope ratio mass spectrometry,N,Bradleystrandesia cf. fuscata ## d18Oostracod delta 18O,ostracod,,per mil VPDB,,Paleolimnology ,,isotope ratio mass spectrometry,N,Bradleystrandesia cf. fuscata ## d13Csediment delta 13C,sediment,,per mil VPDB,,Paleolimnology ,,isotope ratio mass spectrometry,N,acidified sediment organics #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: -999 depth_cm age_BP d13Costracod d18Oostracod d13Csediment 1 -60 -999 -999 -28.7 3 -47 -3.3 -2.5 -28.9 5 -34 -5.8 -3.0 -28.8 7 -21 -4.0 -2.2 -28.6 9 -8 -1.3 1.1 -28.6 11 4 -0.6 1.0 -28.1 13 17 -2.4 0.6 -26.2 15 29 -3.8 -1.4 -25.4 17 42 -9.2 4.9 -26.0 19 55 -6.8 -7.2 -25.7 21 68 -2.8 -0.8 -26.2 23 81 -5.2 -2.2 -26.9 25 94 -4.4 -2.8 -26.3 27 110 -1.6 -3.6 -26.1 29 127 -1.5 0.8 -24.6 31 145 -5.1 -4.2 -23.2 33 166 -4.2 -1.7 -25.5 35 186 -4.2 -3.6 -23.7 37 207 -4.6 -1.7 -25.7 39 228 -5.8 -4.5 -26.4 41 248 -2.3 -2.7 -26.4 43 268 0.2 -1.0 -26.1 45 288 0.3 -1.1 -26.1 47 306 -4.1 0.8 -24.7 49 324 0.1 -2.3 -25.1 51 339 -5.6 0.5 -26.6 53 352 -3.5 -3.0 -26.8 55 364 -6.0 -4.3 -26.9 57 376 -3.5 0.3 -27.8 59 388 -1.9 0.0 -29.2 50.5 336 -2.4 -0.9 -26.3 51.5 342 -0.8 -1.0 -26.7 52.5 349 -1.9 0.3 -27.7 53.5 355 -3.2 -2.1 -28.3 54.5 361 -3.3 -1.8 -29.7 55.5 367 -4.0 -1.5 -30.4 56.5 373 -7.1 -3.7 -29.7 57.5 379 -4.1 -1.8 -30.1 58.5 385 -5.0 -3.7 -30.2 59.5 391 -5.0 -2.3 -30.4 60.5 397 -4.6 -3.7 -30.0 61.5 403 -5.9 -4.7 -28.5 62.5 409 -5.7 -4.6 -27.6 63.5 415 -1.2 -1.5 -26.3 64.5 420 -999 -999 -25.6 65.5 426 -999 -999 -27.1 66.5 432 -4.0 -2.9 -27.1 67.5 438 -2.2 -1.5 -27.6 68.5 445 -999 -999 -27.4 69.5 451 2.3 -2.5 -27.0 70.5 457 -999 -999 -29.1 71.5 463 -999 -999 -29.9 72.5 469 -999 -999 -30.0 73.5 475 -4.6 -2.7 -31.8 74.5 482 -3.8 -2.5 -31.1 75.5 488 -4.7 -2.8 -30.8 76.5 493 -7.4 -4.4 -30.2 77.5 499 -6.0 -3.4 -30.2 78.5 505 -7.2 -4.3 -27.8 79.5 511 -6.6 -5.4 -26.8 80.5 515 -2.3 -3.2 -24.8 81.5 519 -2.8 3.4 -23.8 82.5 522 -0.5 -1.4 -23.9 83.5 525 -2.3 -3.8 -24.3 84.5 529 -0.9 -2.6 -25.2 85.5 532 -1.3 -2.5 -25.3 86.5 534 -2.5 1.5 -25.6 87.5 536 -0.6 1.8 -25.5 88.5 539 -2.3 0.3 -25.5 89.5 541 -1.1 1.6 -25.1 90.5 544 -1.6 -1.0 -24.8 91.5 546 -0.7 1.1 -24.7 92.5 548 -3.5 -2.9 -24.9 93.5 550 -0.9 0.9 -24.6 94.5 553 2.1 2.4 -25.3 95.5 555 -1.3 -1.3 -26.4 96.5 557 -3.8 -3.7 -27.1 97.5 560 -5.5 -4.7 -26.4 98.5 562 -0.1 -1.0 -25.9 99.5 564 -2.5 -2.8 -25.3 100.5 567 -0.7 -1.0 -27.5 101.5 569 -2.3 1.5 -27.3 102.5 572 -2.9 -3.9 -28.1 103.5 574 -0.2 -0.8 -25.6 104.5 576 -4.2 -3.9 -28.6 105.5 579 -5.9 -5.6 -29.4 106.5 581 -4.0 -5.0 -25.2 107.5 584 -999 -999 -23.3 108.5 586 -4.9 -5.3 -23.2 109.5 588 -4.8 -6.1 -25.1 110.5 591 -999 -999 -26.4 111.5 593 -999 -999 -26.8 112.5 595 -4.8 -5.4 -25.6 113.5 598 -999 -999 -26.7 114.5 600 -999 -999 -26.0 115.5 602 -999 -999 -27.7 116.5 604 -999 -999 -26.6 117.5 607 -999 -999 -27.8 118.5 609 -999 -999 -28.3 119.5 612 -999 -999 -27.9 120.5 614 -999 -999 -29.7 121.5 616 -999 -999 -30.4 122.5 619 -6.6 -4.7 -30.4 123.5 621 -6.4 -3.1 -30.3 124.5 623 -5.5 -2.1 -29.0 125.5 628 -6.5 -4.1 -28.1 126.5 634 -7.1 -5.4 -28.2 127.5 641 -4.3 -1.2 -27.1 128.5 647 -2.9 2.4 -25.5 129.5 654 -3.1 -0.2 -24.6 130.5 666 -2.1 2.2 -25.3 131.5 686 -3.8 -3.4 -26.7 132.5 705 -1.5 2.4 -27.6 133.5 725 -999 -999 -27.5 134.5 744 -999 -999 -29.2 135.5 763 -999 -999 -29.6 136.5 783 -999 -999 -30.0 137.5 803 -999 -999 -29.6 138.5 822 -999 -999 -28.6 139.5 842 -999 -999 -28.1 140.5 861 -999 -999 -28.6 141.5 880 -6.7 -4.4 -27.5 142.5 899 -999 -999 -28.7 143.5 918 -999 -999 -29.5 144.5 937 -999 -999 -28.6 145.5 956 -999 -999 -28.4 146.5 976 -999 -999 -30.4 147.5 996 -999 -999 -31.2 148.5 1016 -4.4 -1.9 -29.9 150.5 1055 -5.0 -3.0 -26.8 151.5 1075 -2.2 0.4 -28.1 152.5 1095 -7.2 -4.4 -28.3 153.5 1114 -7.4 -4.9 -28.6 154.5 1134 -3.8 -1.0 -28.6 155.5 1148 -4.3 -0.1 -27.7 156.5 1155 -7.6 -4.7 -27.8 157.5 1163 -999 -999 -29.3 158.5 1171 -5.7 -3.9 -28.7 159.5 1178 -999 -999 -29.0 160.5 1186 -4.4 -3.7 -28.1 161.5 1193 -999 -999 -26.6 162.5 1200 -5.6 -2.0 -28.8 163.5 1207 -6.6 -4.3 -29.3 164.5 1215 -4.3 -1.4 -28.9 165.5 1222 -5.4 -3.8 -30.9 166.5 1229 -5.4 -3.8 -31.1 167.5 1236 -5.5 -3.5 -30.5 168.5 1243 -6.1 -3.5 -30.3 169.5 1251 -5.1 -3.5 -31.1 170.5 1258 -3.6 -2.3 -29.3 171.5 1265 -3.5 -4.3 -28.0 172.5 1271 -5.1 -5.7 -28.0 173.5 1278 -4.3 -3.1 -28.2 174.5 1285 -999 -999 -28.0 175.5 1292 -4.2 -2.9 -27.3 176.5 1299 -999 -999 -27.6 177.5 1307 -999 -999 -29.1 178.5 1314 -999 -999 -28.9 179.5 1321 -999 -999 -29.2 180.5 1328 -4.8 -5.1 -29.8 181.5 1335 -3.9 -3.4 -30.6 182.5 1342 -3.6 -3.5 -31.6 183.5 1349 -4.9 -4.9 -32.6 184.5 1356 -4.9 -5.5 -31.6 185.5 1364 -4.7 -2.9 -30.4 186.5 1371 -5.0 -4.5 -30.3 187.5 1378 -2.1 -0.8 -29.1 188.5 1385 -3.3 -2.2 -27.0 189.5 1392 -3.7 -2.8 -25.4 190.5 1400 -999 -999 -24.5 191.5 1407 -4.4 -3.4 -25.7 192.5 1414 -4.6 -4.1 -25.2 193.5 1422 0.8 -0.7 -27.0 194.5 1429 -4.2 -5.3 -28.3 195.5 1436 -5.2 -5.5 -29.9 196.5 1443 -2.5 -2.7 -29.6 197.5 1450 -2.3 -1.5 -30.8 198.5 1457 -6.3 -5.8 -31.3 199.5 1464 -5.5 -5.9 -26.6 200.5 1470 -4.4 -2.7 -25.6 201.5 1475 -0.9 -1.6 -24.4 202.5 1479 -3.3 -2.5 -24.7 203.5 1484 -999 -999 -25.5 204.5 1488 -4.3 -4.5 -26.6 205.5 1493 -4.1 -3.6 -29.0 206.5 1498 -2.5 -3.8 -30.1 207.5 1502 -2.9 -4.2 -30.5 208.5 1507 -4.0 -4.3 -30.6 209.5 1511 -2.6 -3.7 -30.4 210.5 1516 -2.4 -4.7 -29.0 211.5 1520 -1.1 -1.2 -27.4 212.5 1525 -0.9 -2.1 -28.7 213.5 1529 -2.1 -0.8 -29.3 214.5 1534 -1.3 -3.7 -28.6 215.5 1539 -3.1 -3.2 -28.2 216.5 1543 -2.6 -2.6 -28.3 217.5 1548 -2.7 -1.6 -28.3 218.5 1553 -0.4 -0.4 -28.3 219.5 1557 -1.3 -0.8 -28.4 220.5 1564 -4.8 -3.6 -28.1 221.5 1572 -2.8 -2.4 -28.1 222.5 1580 -1.7 -1.3 -28.3 223.5 1588 -4.2 -4.1 -28.7 224.5 1596 -1.5 -0.4 -28.7 225.5 1604 -3.3 -1.9 -28.7 226.5 1613 -2.3 -1.6 -28.8 227.5 1622 -2.8 -0.6 -28.7 228.5 1631 -2.6 -1.6 -28.8 229.5 1640 1.0 -1.2 -25.2 230.5 1650 3.0 1.9 -21.5 231.5 1661 1.6 -2.9 -21.2 232.5 1671 -999 -999 -20.6 233.5 1682 -999 -999 -20.4 234.5 1693 -7.1 -1.0 -21.8 235.5 1708 -999 -999 -22.9