Dwarfing of ostracodes during the Paleocene-Eocene Thermal Maximum at DSDP Site 401 (Bay of Biscay, North Atlantic) and its implication for changes in organic carbon cycle in deep-sea benthic ecosystem

摘要: Abstract The Paleocene–Eocene Thermal Maximum (PETM) has been held up as a past analog to future environmental change and presents the opportunity study climate impacts on marine communities. During PETM, deep-sea benthic foraminifers decreased their body-size increased productivity, metabolic rates, food consumption in response abruptly increasing temperature changing surface water productivity. Here we find that three species of ostracodes – part multicellular benthos also experienced reduction PETM warming Northeast Atlantic. Positive correlations between ostracode foraminiferal oxygen isotope data indicate reduced body-sizes were caused by high during PETM. Dwarfing interval suggests lifetimes, less than those pre-PETM interval. This interpretation is based upon previous studies show lifetimes both decrease increase growth rates under higher temperatures. Estimates body volume, temperature, individual abundance suggest decline lifetime rate individuals core In addition there biomass flux whole community at this time. level major changes energy flow carbon cycling ecosystem organic sediments stands contrast with interpretations foraminifera Hence, our was not uniform different taxonomic groups.