Antarctic climate cooling and response of diatoms in glacial meltwater streams
Geophysical Research Letters
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Abstract
To understand biotic responses to an Antarctic cooling trend diatom samples from glacial meltwater streams in the McMurdo Dry Valleys, the largest ice-free area in Antarctica. Diatoms are abundant in these streams, and 24 of 40 species have only been found in the Antarctic. The percentage of these Antarctic diatom species increased with decreasing annual stream flow and increasing harshness of the stream habitat. The species diversity of assemblages reached a maximum when the Antarctic species accounted for 40-60% of relative diatom abundance. Decreased solar radiation and air-temperatures reduce annual stream flow, raising the dominance of these Antarctic species to levels above 60%. Thus, cooling favors the Antarctic species, and lowers diatom species diversity in this region. Copyright 2006 by the American Geophysical Union.
Suggested Citation
Esposito, R., Horn, S., McKnight, D.M., Cox, M., Grant, M., Spaulding, S., Doran, P., Cozzetto, K., 2006, Antarctic climate cooling and response of diatoms in glacial meltwater streams: Geophysical Research Letters, v. 33, no. 7, https://doi.org/10.1029/2006GL025903.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Antarctic climate cooling and response of diatoms in glacial meltwater streams |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2006GL025903 |
| Volume | 33 |
| Issue | 7 |
| Publication Date | April 15, 2006 |
| Year Published | 2006 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Research Letters |