2018/10/01 by Makoto Noguchi, Toshiyuki Fujiki, Mitsuru Okuno +8 · 5 citations
Earth and Planetary Sciences · Environmental Science · #Biology #Botany #Cyperaceae #Geology #Geology and Paleoclimatology Research #Isotope Analysis in Ecology #Macrofossil #Methane Hydrates and Related Phenomena #Poaceae #Pollen #Vegetation (pathology)
paper · doi:10.1017/rdc.2018.103
published in Radiocarbon 60(5), 1483-1492 (Cambridge University Press)
openalex publication_date 2018/10/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/25
ABSTRACT We collected peat sediments (sediment core ADK13083002) from Haven Lake on the north side of Adak Island (central Aleutian Islands, Alaska) to determine whether the vegetation has changed. We confirmed the presence of six tephra layers, including Forty Years (0.3 cal ka BP), T2, YBO (3.3 cal ka BP), Intermediate (6.4 cal ka BP), Main (9.5 cal ka BP), and T6. We identified four major pollen assemblage zones (HL-1 to HL-4, in descending order) in the cored sediment. HL-1 was dominated by Ranunculaceae and Empetrum pollen; H-2 was dominated by Poaceae, Ranunculaceae, and Empetrum pollen; HL-3 was dominated by Poaceae and Empetrum pollen; and HL-4 was dominated by Poaceae, Cyperaceae, Lycopodiaceae , and Empetrum pollen. Small charcoal particles, likely transported from a distance, were found at low frequencies until 6.4 cal ka BP. The total cross-sectional area of charcoal particles increased to 1500 μm 2 or more by 6.4 cal ka BP, implying that the large charcoal particles originated from nearby Aleut settlements, which were established around the same time.