Publication Date:
2024-01-09
Description:
The dinoflagellate cyst record from Ocean Drilling Program Hole 893A, Santa Barbara Basin, southern California, is examined at millennial-scale resolution for the past 40 kyr. Changes in cyst abundance, composition of cyst assemblages, and their diversity reflect major shifts in climate and ocean circulation in the region over this time interval. Throughout the sequence, dinoflagellate cyst assemblages are dominated by heterotrophic dinoflagellates. Brigantedinium spp. and other upwelling-related taxa such as Echinidinium and Protoperidinium americanum are abundant, indicating the continued influence of coastal upwelling on the basin during the late Quaternary. A significant increase in cyst accumulation rates is seen during the Holocene and, to a lesser extent, during shorter warming events such as Bolling/Allerod and Dansgaard-Oeschger interstadials, implying enhanced marine productivity during these periods. Cyst diversity is high during the Holocene. An increase in abundance of cysts produced by autotrophic dinoflagellates in the late Holocene suggests enhanced input of warm, nutrient-rich waters. In contrast, cyst assemblages from the Last Glacial Maximum exhibit a relatively low diversity and an increase in the cysts of heterotrophic dinoflagellates, in particular Selenopemphix nephroides. The presence of this taxon in association with Brigantedinium spp. implies substantial cooling of surface waters in the Santa Barbara Basin at that time.
Keywords:
146-893A; AGE; Alexandrium tamarense, flux; Brigantedinium sp., flux; Counting, dinoflagellate cysts; DEPTH, sediment/rock; Dinoflagellate autotrophic, flux; Dinoflagellates, heterotrophic, flux; Dinoflagellate total, flux; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Dubridinium sp., flux; Echinidinium aculeatum, flux; Echinidinium sp., flux; Foraminiferal organic linings, flux; Halodinium sp., flux; Heterosigma akashiwo, flux; Hexasterias problematica, flux; Impagidinium aculeatum, flux; Impagidinium pallidum, flux; Impagidinium paradoxum, flux; Impagidinium sp., flux; Islandinium brevispinosum, flux; Islandinium cezare, flux; Islandinium minutum, flux; Joides Resolution; Leg146; Lejeunecysta oliva, flux; Lingulodinium machaerophorum, flux; Mandibles, flux; Nematosphaeropsis labyrinthus, flux; North Pacific Ocean; Ocean Drilling Program; ODP; Operculodinium centrocarpum, flux; Pediastrum sp., flux; Pentapharsodinium dalei, flux; Pollen, flux; pollen analytical standard techniques (Faegri & Iversen, 1989, Textbook Pollen); Polykrikos kofoidii, flux; Polykrikos schwarzii, flux; Protoperidinium americanum, flux; Pyxidinopsis reticulata, flux; Quinquecuspis concreta, flux; Radiosperma corbiferum, flux; Sample code/label; Selenopemphix nephroides, flux; Selenopemphix quanta, flux; Spiniferites bulloideus, flux; Spiniferites membranaceus, flux; Spiniferites mirabilis, flux; Spiniferites ramosus, flux; Spiniferites sp., flux; Tectatodinium pellitum, flux; Trinovantedinium applanatum, flux; Trinovantedinium variabile, flux; Undetermined taxa, flux; Votadinium calvum, flux; Votadinium spinosum, flux
Type:
Dataset
Format:
text/tab-separated-values, 2302 data points
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