Biology

I hereby declare that I am the sole author of this thesis. This is a true copy of the thesis, including any required final revisions, as accepted by my examiners. I understand that my thesis may be made electronically available to the public. ii Diatom analyses were carried out on sediment cores collected from two low-lying, closed-drainage basins (PAD 9- 58º46.46’N, 111º19.48’W; PAD 12- 58º57.29’, 111º19.74’) in th