Lipid biomarker analyses of sedimentary organic matter from a marine Triassic-Jurassic (T-J) section at Queen Charlotte
Islands, British Columbia reveal significant bacterial activity and microbial community changes that coincide with faunal
extinctions across the T-J boundary. Bacterial activity is indicated by the 25-norhopane biodegradation index
(25-norhopanes / 25-norhopanes+regular hopanes). Microbial community changes is revealed by variations in relative
abundance of 2-methylhopane which is mainly generated from cyanobacteria. The 2-methylhopane index (2-methyl
hopane/ C30 hopane + C29 25-norhopane) increases above the radiolarian based T-J boundary, and coincides with changes
in the 25-norhopane index. The data reveal a complex microbial event involving both autotrophic and heteorotrophic
bacteria responding to variations in allochthonous organic matter and nutrient supply.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.