Testate amoebae and δ13C of Sphagnum as surface-moisture proxies in Alaskan peatlands
Bibliographic Data
| ID | 12266558 |
|---|---|
| Authors | Erin R Markel (Lehigh University, corresponding author), Robert K Booth (0000-0002-9264-4959, Lehigh University), Yangmin Qin (0000-0002-4827-3388, China University of Geosciences) |
| Year | 2010 |
| Volume | 20 |
| Issue | 3 |
| Pages | 463-475 |
| Publication date | 2010-02-22 |
| Peer Reviewed | Yes |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | The Holocene (JOURNAL) |
| Journal identifiers | ISSN: 0959-6836 • E-ISSN: 1477-0911 |
| Publisher | SAGE Publishing (PUBLISHER • US) |
| DOI | 10.1177/0959683609354303 |
| OpenAlex | W2120469960 |
| Language | EN |
| Citations received | 11 |
| References cited | 83 |
Testate amoebae and stable isotopes have been used as surface-moisture proxies in peatlands. However, adequate modern calibration is critical to successful application and interpretation. Testate amoebae, δ 13 C of Sphagnum, and environmental conditions were examined at 126 sites within 12 peatlands of south-central and central Alaska to assess the potential of testate amoebae and δ 13 C as surface-moisture proxies. Results indicate that water-table depth and pH were both correlated with testate amoeba community composition. However, the relative importance of these two variables varied, with pH more important in wetter habitats and water-table depth more important in drier habitats. Cross-validation of transfer functions indicated that water-table depth and pH can be inferred from testate amoeba communities with mean errors of ~8 cm and ~0.4 pH units, respectively, an improvement over previous calibration work in the region. However, application of these transfer functions should consider potential temporal variability in the relative importance of pH and water-table depth, and we applied our calibration data set to a subfossil testate amoeba record to highlight how knowledge of changes in the relative importance of these environmental variables can inform interpretation. In contrast with testate amoebae, δ 13 C of Sphagnum was found to be a relatively weak indicator of water-table depth. Variable carbon sources for Sphagnum photosynthesis, such as CO 2 released by methanotrophic bacteria, likely complicate the relationship between δ 13 C and moisture. Although more work is needed before δ 13 C of Sphagnum can be used as a proxy for water-table depth, testate amoebae should be useful in paleoenvironmental studies of peatlands in Alaska
Biology · Holocene · Mire · Peat · Sphagnum · Subfossil · Testate amoebae · Water table · Environmental Science · Geology and Paleoclimatology Research · Methane Hydrates and Related Phenomena · Peatlands and Wetlands Ecology · Ecology · Geology · Paleontology
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| Unique citing works | 11 |
|---|---|
| Citations per year | 0,73 |
| Citation span | 2011 - 2026 (16) |
| Citation velocity | current |
| Highly cited | No |
| Citation types | Neutral: 10 |