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  • 1
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    Chironomid (Insecta: Chironomidae) community structure response to hydrological changes in the mid‐1950s in lake Nam Co, Tibetan Plateau (2023)
    Details
    Publikationsdatum: 2024-02-05
    Beschreibung: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉ABSTRACT〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉The recent rise in air temperatures detected at high altitudes of the Tibetan Plateau has accelerated glacier melt and retreat. Moreover, enhanced monsoonal precipitation has increased runoff and transport of allochthonous material to the lakes. Consequently, water levels are rising, modifying the spatial distribution and composition of local aquatic biota. To infer these environmental and biological changes in recent decades, a 30‐cm‐long sediment core, representing the past ~160 years, from Nam Co, an endorheic lake, was analyzed for subfossil chironomid assemblages and sediment geochemistry. In total, 25 chironomid morphotypes were identified. Nineteen were considered as non‐rare taxa (abundances ≥2%) and six as rare taxa (abundances 〈2%). Since 1956 〈sc〉ce〈/sc〉, higher chironomid richness (〈italic〉S〈/italic〉 = 19) is evident compared to the previous 100 years. The simultaneous decrease in the abundance of profundal 〈italic〉Micropsectra radialis〈/italic〉‐type and increase of both 〈italic〉Chironomus〈/italic〉 and 〈italic〉Procladius〈/italic〉, taxa adapted to more eurytopic and slightly warmer water bodies, indicate increasing water temperatures and intensified primary productivity. The dominance of littoral chironomid assemblages reflects increasing lake water levels, flooded shorelines and expansion of littoral areas driven by increased precipitation and glacial meltwater input both resulting from the increase in air temperatures. This scenario is confirmed by increases in total nitrogen and Zr/Rb ratios, indicating higher productivity and coarser grain size as a consequence of increased runoff via the Niya Qu. These hydrological changes have resulted in a positive water balance that can be linked to an increase in moisture supply from the Indian summer monsoon and glacier melt, reflecting increasing temperatures and precipitation since 1956 〈sc〉ce〈/sc〉, ultimately driven by anthropogenic warming.〈/p〉
    Beschreibung: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Schlagwort(e): ddc:577.6 ; chironomid ; Indian summer monsoon ; Nam Co ; Niya Qu ; nutrients ; runoff ; water level
    Sprache: Englisch
    Materialart: doc-type:article
    Standort Signatur Einschränkungen Verfügbarkeit
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    CITATION GEO-LEO
  • 2
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    Limnological, sedimentological, mineralogical and geological data of 76 aquatic ecosystems of the northern Neotropics (from Yucatán Peninsula Mexico to Nicaragua) sampled in 2013 (2022)
    PANGAEA
    Details
    Publikationsdatum: 2023-03-14
    Beschreibung: Here, we present 23 water physical (temperature, dissolved oxygen, pH, conductivity) and chemical (major anions Cl-, SO42-, CO32-, HCO3- and cations Ca2+, K+, Mg2+, Na+), sedimentological (total carbon (TC), total inorganic carbon (TIC), total organic carbon (TOC), total nitrogen (TN)), mineralogical (quartz, carbonate, phyllosilicates and feldspars) and geological (altitude, bedrock type and age of sediments) variables of aquatic systems of the Northern Neotropical region. Sampling was conducted in 76 aquatic systems during July-October 2013, coinciding with the rainy season in the region. Sampling sites are located on the Yucatán Peninsula Mexico (n=28), Guatemala (n=26), El Salvador (n=14), Honduras (n=5) and Nicaragua (n=3). We aim to identify limnological regions based on the measured variables and to infer the influence of geodiversity in observed patterns. Water physical and chemical variables were measured in situ with a WTW Multi Set 350i multiparameter probe at a water depth of 0.5 m. Water samples for analysis of major anions and cations were collected at water depths of 0.5 m below surface. TC and TN in sediments contents were determined by combustion with a LECO TruSpec Macro CHN analyzer. TIC was quantified with a Woesthoff Carmhograph C-16. TOC was calculated by subtracting TIC from TC. Qualitative and semi-quantitative mineralogical compounds were examined by x-ray diffraction with a RIGAKU Miniflex600. ArcGIS software was used to identify geological attributes of sampling sites such as bedrock and age of sediments. Altitude, latitude, and longitude were determined with the navigator Garmin GPSmap 60c.
    Schlagwort(e): ArcGIS software; Bedrock type; Bicarbonate ion; Calcium; Calculated by subtracting TIC from TC; Carbon, inorganic, total; Carbon, organic, total; Carbon, total; Carbonate; Carbonate, Intensity; Chloride; Conductivity, electrolytic; DATE/TIME; DEPTH, water; Device type; ELEVATION; Epoch; Event label; Feldspar, Intensity; LATITUDE; LECO TruSpec Macro CHN analyzer; Limnolgy; LONGITUDE; Magnesium; mineralogy; MULT; Multiple investigations; Nitrogen, total; northern Neotropical region; northern Neotropics; Oxygen; pH; Phyllosilicates, Intensity; Potassium; Quartz, intensity; Sample ID; Sedimentology; Sodium; Sulfate; Temperature, water; Woesthoff Carmhograph C-16; WTW Multi Set 350i multiparameter probe; X-ray diffraction (RIGAKU Miniflex600); YP-GSHN-2013; YP-GSHN-2013_ALE; YP-GSHN-2013_AMA; YP-GSHN-2013_APA; YP-GSHN-2013_ARA; YP-GSHN-2013_ATI; YP-GSHN-2013_BAC; YP-GSHN-2013_CAL; YP-GSHN-2013_CAMP; YP-GSHN-2013_CAN; YP-GSHN-2013_CAO; YP-GSHN-2013_CH1; YP-GSHN-2013_CH2; YP-GSHN-2013_CHA; YP-GSHN-2013_CHI; YP-GSHN-2013_COA; YP-GSHN-2013_COL; YP-GSHN-2013_COM; YP-GSHN-2013_CSAB; YP-GSHN-2013_DIE; YP-GSHN-2013_EMI; YP-GSHN-2013_ENC; YP-GSHN-2013_ESP; YP-GSHN-2013_GLO; YP-GSHN-2013_GMI; YP-GSHN-2013_GRA; YP-GSHN-2013_GUI; YP-GSHN-2013_ILO; YP-GSHN-2013_IPA; YP-GSHN-2013_ITZ; YP-GSHN-2013_JOC; YP-GSHN-2013_JOS; YP-GSHN-2013_JUA; YP-GSHN-2013_JUC; YP-GSHN-2013_KAN; YP-GSHN-2013_LAC; YP-GSHN-2013_LCH1; YP-GSHN-2013_LCH2; YP-GSHN-2013_MAD; YP-GSHN-2013_MAG; YP-GSHN-2013_MAN; YP-GSHN-2013_MAS; YP-GSHN-2013_MET; YP-GSHN-2013_MIG; YP-GSHN-2013_MIS; YP-GSHN-2013_MU1; YP-GSHN-2013_MU2; YP-GSHN-2013_MUY; YP-GSHN-2013_NAG; YP-GSHN-2013_NEG; YP-GSHN-2013_NIC; YP-GSHN-2013_NOH; YP-GSHN-2013_OLO; YP-GSHN-2013_OQU; YP-GSHN-2013_OXO; YP-GSHN-2013_PE1; YP-GSHN-2013_PET; YP-GSHN-2013_PIN; YP-GSHN-2013_PO1; YP-GSHN-2013_PO2; YP-GSHN-2013_QUE; YP-GSHN-2013_ROS; YP-GSHN-2013_SAB; YP-GSHN-2013_SAC; YP-GSHN-2013_SAL; YP-GSHN-2013_SEN; YP-GSHN-2013_SEP; YP-GSHN-2013_SIJ; YP-GSHN-2013_SIL; YP-GSHN-2013_TEK; YP-GSHN-2013_TIC; YP-GSHN-2013_VAL; YP-GSHN-2013_VER; YP-GSHN-2013_YAL; YP-GSHN-2013_YAX; YP-GSHN-2013_YOJ; YP-GSHN-2013_YUM
    Materialart: Dataset
    Format: text/tab-separated-values, 1652 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 3
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    Pollen taxa diversity of sediment core PI-6 (85 ka BP) from Lake Petén Itzá, Guatemala (ICDP-2004/03) (2021)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Beschreibung: Ostracodes and pollen preserved in a 75.9-m-long sediment core (PI-6) recovered from Lake Petén Itzá, Guatemala were used to assess the magnitude and velocity of aquatic and terrestrial community responses during the last 85,000 years. The following pollen data are provided: Taxa diversity (pollen sum).
    Schlagwort(e): AGE; aquatic and terrestrial communities; CDRILL; Core drilling; DEPTH, sediment/rock; diversity; Guatemala; Holocene; Holocene Thermal Maximum; ICDP-2004/03-PI6; Lake Petén Itzá; northern Neotropics; Petén Itzá, Guatemala; PI-6; Pleistocene; Pollen; Pollen diversity index
    Materialart: Dataset
    Format: text/tab-separated-values, 445 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 4
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    Freshwater juvenile ostracode data of sediment core PI-6 (85 ka BP) from Lake Petén Itzá, Guatemala (ICDP-2004/03) (2021)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Beschreibung: Ostracodes and pollen preserved in a 75.9-m-long sediment core (PI-6) recovered from Lake Petén Itzá, Guatemala were used to assess the magnitude and velocity of aquatic and terrestrial community responses during the last 85,000 years. Our juvenile ostracode data includes information on species abundances and richness, diversity index.
    Schlagwort(e): abundances; AGE; aquatic and terrestrial communities; CDRILL; Core drilling; Counting, ostracoda, juvenile; Cypria petenensis; Cyprididae; Cypridopsis vidua; Cytheridella ilosvayi; Darwinula stevensoni; DEPTH, sediment/rock; diversity; Guatemala; Heterocypris putei; Holocene; Holocene Thermal Maximum; ICDP-2004/03-PI6; Lake Petén Itzá; northern Neotropics; Ostracoda valves per unit mass; ostracodes; Paracythereis opesta; Petén Itzá, Guatemala; PI-6; Pleistocene; Pseudocandona antilliana; Shannon Diversity Index; species richness; Species richness; Strandesia intrepida
    Materialart: Dataset
    Format: text/tab-separated-values, 4092 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 5
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    X-ray fluorescence inorganic geochemistry measurements of Site PI-02 from Lake Petén Itzá, Guatemala (2023)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Schlagwort(e): AGE; Aluminium; Calcium; Calculated; DEPTH, sediment/rock; Drilling/coring; Geometric mean; ICDP; inorganic geochemistry; International Continental Scientific Drilling Program; Iron; Lake Petén Itzá; Lake Petén Itzá, Guatemala; Manganese; Marine Isotope Stage 3; mineralogy; Neotropics; PI-02; Titanium; X-ray fluorescence ITRAX core scanner, Cr-tube 30kV 55mA, Cox Analytical
    Materialart: Dataset
    Format: text/tab-separated-values, 23004 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 6
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    XRF element centered log-ratios (CLR) of Site PI-02 from Lake Petén Itzá, Guatemala (2023)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Schlagwort(e): AGE; Aluminium (centered log ratio); Calcium/(Titanium+Iron) ratio; Calcium (centered log ratio); Calculated; DEPTH, sediment/rock; Drilling/coring; ICDP; inorganic geochemistry; International Continental Scientific Drilling Program; Iron (centered log ratio); Lake Petén Itzá; Lake Petén Itzá, Guatemala; Manganese/Iron ratio; Manganese (centered log ratio); Marine Isotope Stage 3; mineralogy; Neotropics; PI-02; Titanium (centered log ratio)
    Materialart: Dataset
    Format: text/tab-separated-values, 26708 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 7
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    Mineralogy of Site PI-02 from Lake Petén Itzá, Guatemala (2023)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Schlagwort(e): AGE; Carbonates; Clay; DEPTH, sediment/rock; Drilling/coring; Gypsum; ICDP; inorganic geochemistry; International Continental Scientific Drilling Program; Lake Petén Itzá; Lake Petén Itzá, Guatemala; Marine Isotope Stage 3; mineralogy; Neotropics; PI-02; Quartz; X-ray diffraction (RIGAKU Miniflex600)
    Materialart: Dataset
    Format: text/tab-separated-values, 392 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 8
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    Freshwater adult ostracode data of sediment core PI-6 (85 ka BP) from Lake Petén Itzá, Guatemala (ICDP-2004/03) (2021)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Beschreibung: Ostracodes and pollen preserved in a 75.9-m-long sediment core (PI-6) recovered from Lake Petén Itzá, Guatemala were used to assess the magnitude and velocity of aquatic and terrestrial community responses during the last 85,000 years. Adult ostracode data includes information on species abundances and richness, diversity index.
    Schlagwort(e): abundances; AGE; aquatic and terrestrial communities; CDRILL; Core drilling; Counting, ostracoda, adult; Cypria petenensis; Cyprididae; Cypridopsis vidua; Cytheridella ilosvayi; Darwinula stevensoni; DEPTH, sediment/rock; diversity; Guatemala; Heterocypris putei; Holocene; Holocene Thermal Maximum; ICDP-2004/03-PI6; Lake Petén Itzá; northern Neotropics; Ostracoda valves per unit mass; ostracodes; Paracythereis opesta; Petén Itzá, Guatemala; PI-6; Pleistocene; Pseudocandona antilliana; Shannon Diversity Index; species richness; Species richness; Strandesia intrepida
    Materialart: Dataset
    Format: text/tab-separated-values, 4092 data points
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    DATA PANGAEA
  • 9
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    Pollen taxa richness of sediment core PI-6 (85 ka BP) from Lake Petén Itzá, Guatemala (ICDP-2004/03) (2021)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Beschreibung: Ostracodes and pollen preserved in a 75.9-m-long sediment core (PI-6) recovered from Lake Petén Itzá, Guatemala were used to assess the magnitude and velocity of aquatic and terrestrial community responses during the last 85,000 years. The following pollen data are provided: Taxa richness.
    Schlagwort(e): AGE; aquatic and terrestrial communities; CDRILL; Core drilling; Guatemala; Holocene; Holocene Thermal Maximum; ICDP-2004/03-PI6; Lake Petén Itzá; northern Neotropics; Petén Itzá, Guatemala; PI-6; Pleistocene; Pollen; species richness; Species richness
    Materialart: Dataset
    Format: text/tab-separated-values, 445 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 10
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    Geochemical and mineralogical record of MIS3-2 from Lake Petén Itzá (PI-02 Site) Guatemala (2023)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Beschreibung: Inorganic geochemistry data (Ti, Al, Ca, Fe, and Mn) and mineralogy of sediments from Lake Petén Itzá are presented. Lake Petén Itzá was drilled in 2006 by the International Continental Discovery Program, obtaining seven lacustrine sedimentary records: PI-01, PI-02, PI-03, PI-04, PI-06, PI-7, and PI-9. Here, we present data from site PI-02 located north of the lake (16°59'58.04''N; 89°44'41.51''W) and measured between 67 and 19 m depth. Inorganic geochemistry data were obtained by X-ray fluorescence (XRF) using a Cox Analytical Itrax Core Scanner (Cr tube, 30 kV, 55 mA, 15 s exposure) with a resolution of 1 cm. XRF data is displayed in counts per second (cps). Subsequently, a transformation to centered log-ratio (CLR) was performed. The CLR data were obtained by dividing each value by the geometric mean of the elements measured at said depth, then the natural logarithm of said quotient was obtained. CLR results have no units. The mineralogy data were obtained every 1 m by ray diffraction (XRD) using a Rigaku MiniFlex 600 equipment (15 mA/40kV) in a rotation axis between 3 and 80°. The XRD values are in relative percentages obtained using the X-Pert High Score software (version 1.0b) and the diffraction potential files of the International Center for Diffraction Data, USA. Depth data corresponds with the master composite sequence presented by Mueller et al. (2010), while age data belongs to the age-depth model presented by Martínez-Abarca et al. 2023.
    Schlagwort(e): ICDP; inorganic geochemistry; International Continental Scientific Drilling Program; Lake Petén Itzá; Marine Isotope Stage 3; mineralogy; Neotropics
    Materialart: Dataset
    Format: application/zip, 3 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
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