Skip to Main Content
GEOREF RECORD

Tropical ochrophyte algae from the Eocene of northern Canada; a biogeographic response to past global warming

Peter A. Siver and Alexander P. Wolfe
Tropical ochrophyte algae from the Eocene of northern Canada; a biogeographic response to past global warming
Palaios (March 2009) 24 (3): 192-198

Abstract

We report on exquisitely preserved specimens of freshwater siliceous algae belonging to the classes Synurophyceae (scaled chrysophytes) and Bacillariophyceae (diatoms) from middle Eocene lake sediments in Northern Canada. When considered in the context of closest extant relatives, these microfossils present unequivocal biogeographic and ecological affinities with warm-water ochrophyte assemblages. We have identified scales that are unambiguously assigned to Mallomonas bangladeshica, a chrysophyte now restricted to tropical lake ecosystems. The diatom genus Actinella is also well represented in these sediments, again with the most comparable extant congeners found in tropical to subtropical localities, particularly in the Southern Hemisphere. We surmise that fundamental biogeographic reorganizations among lacustrine algae took place during Eocene hothouse paleoclimates. In this light, future climate warming should be viewed as a potent vector for similar community shifts, with attendant limnological implications.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 24
Serial Issue: 3
Title: Tropical ochrophyte algae from the Eocene of northern Canada; a biogeographic response to past global warming
Affiliation: Connecticut College, Botany Department, New London, CT, United States
Pages: 192-198
Published: 200903
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 52
Accession Number: 2009-032354
Categories: Paleobotany
Document Type: Serial
Bibliographic Level: Analytic
Annotation: NSF Grant DEB-0716606
Illustration Description: illus. incl. sect., strat. col., sketch map
N64°43'60" - N64°43'60", W109°45'00" - W109°45'00"
Secondary Affiliation: University of Alberta, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 200918
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal