High-resolution late Holocene climate change and human impacts on a hypermaritime peatland on Haida Gwaii, BC, Canada

Resource type
Thesis type
(Thesis) M.Sc.
Date created
A peat core from Sphagnum-dominated Drizzle Bog on Graham Island was used to identify factors that have influenced peatland development during the past ~1800 years. High-resolution paleoecological analysis included percentage and accumulation rate diagrams of pollen and other microfossils. 210Pb dates back to AD 1892 and four AMS radiocarbon dates provide a chronology of peat and microfossil accumulation back to AD 195. Few changes are evident before AD 1400 but a period of warm dry conditions is suggested by high pollen concentrations that coincide with high fire activity throughout the Yukon and Alaska. Low pollen accumulation between ~ 1600 and 1875 support cool growing seasons during the Little Ice Age (LIA). Dramatic increases in regional pollen productivity support rapid warming following the LIA after 1875. Construction of a gravel road through the bog in 1958 likely altered local hydrology as evidenced by changes in communities of rhizopoda and other organisms.
Copyright statement
Copyright is held by the author.
The author granted permission for the file to be printed and for the text to be copied and pasted.
Scholarly level
Supervisor or Senior Supervisor
Thesis advisor: Mathewes, Rolf
Member of collection
Attachment Size
etd7226_MHuntley.pdf 2.74 MB