TY - JOUR
T1 - Ecological Changes in the Nannoplankton Community Across A Shelf Transect During the Onset of the Paleocene-Eocene Thermal Maximum
AU - León y León, Isabel A.
AU - Bralower, Timothy J.
AU - Self-Trail, Jean M.
N1 - Funding Information:
We thank Ashley Grey, Heather Jones, and Marci Robinson for discussions. We are grateful to Mark Patzkowsky and Lee Kump for reviews of an earlier version of this manuscript and to Tom Dunkley Jones, David Watkins, Harry Dowsett, and Marci Robinson for reviews. This research was supported by NSF grant OCE-1415958 to Bralower, the Penn State Bunton Waller Fellowship to Leon y Leon, and by the USGS Land Change Program. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. All data are hosted in the Pangaea database (https://www.pangaea.de/).
Publisher Copyright:
©2018. American Geophysical Union. All Rights Reserved.
PY - 2018/12
Y1 - 2018/12
N2 - Warming and other environmental changes during the Paleocene-Eocene thermal maximum (PETM) led to profound shifts in the composition and structure of nannoplankton assemblages. Here we analyze the nature of these changes in expanded records from the Cambridge-Dorchester and Mattawoman Creek-Billingsley Road cores in Maryland. These cores comprise part of a transect of five paleoshelf cores from Maryland and New Jersey. We integrate multivariate analysis of assemblage data with proxy data to revise understanding of the paleoecological affinities of key species. In particular, Discoaster and Fasciculithus are interpreted as thermophiles without adaptation to particular nutrient levels, while Hornibrookina is considered an opportunist adapted to highly variable nearshore environments. Together the cores show consistent margin-wide changes across the onset of the PETM, including a pulse of preevent warming, possibly combined with lower salinity, high seasonality, or increased turbidity. The event itself was characterized by continued warming and eutrophication across the paleoshelf. The Maryland sites experienced higher environmental variability as a result of their proximity to large river systems.
AB - Warming and other environmental changes during the Paleocene-Eocene thermal maximum (PETM) led to profound shifts in the composition and structure of nannoplankton assemblages. Here we analyze the nature of these changes in expanded records from the Cambridge-Dorchester and Mattawoman Creek-Billingsley Road cores in Maryland. These cores comprise part of a transect of five paleoshelf cores from Maryland and New Jersey. We integrate multivariate analysis of assemblage data with proxy data to revise understanding of the paleoecological affinities of key species. In particular, Discoaster and Fasciculithus are interpreted as thermophiles without adaptation to particular nutrient levels, while Hornibrookina is considered an opportunist adapted to highly variable nearshore environments. Together the cores show consistent margin-wide changes across the onset of the PETM, including a pulse of preevent warming, possibly combined with lower salinity, high seasonality, or increased turbidity. The event itself was characterized by continued warming and eutrophication across the paleoshelf. The Maryland sites experienced higher environmental variability as a result of their proximity to large river systems.
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U2 - 10.1029/2018PA003383
DO - 10.1029/2018PA003383
M3 - Article
AN - SCOPUS:85058957105
SN - 2572-4517
VL - 33
SP - 1396
EP - 1407
JO - Paleoceanography and Paleoclimatology
JF - Paleoceanography and Paleoclimatology
IS - 12
ER -