Warm afterglow from the Toarcian Oceanic Anoxic Event drives the success of deep-adapted brachiopods.
Sci Rep
; 10(1): 6549, 2020 04 16.
Article
in En
| MEDLINE
| ID: mdl-32300235
ABSTRACT
Many aspects of the supposed hyperthermal Toarcian Oceanic Anoxic Event (T-OAE, Early Jurassic, c. 182 Ma) are well understood but a lack of robust palaeotemperature data severely limits reconstruction of the processes that drove the T-OAE and associated environmental and biotic changes. New oxygen isotope data from calcite shells of the benthic fauna suggest that bottom water temperatures in the western Tethys were elevated by c. 3.5 °C through the entire T-OAE. Modelling supports the idea that widespread marine anoxia was induced by a greenhouse-driven weathering pulse, and is compatible with the OAE duration being extended by limitation of the global silicate weathering flux. In the western Tethys Ocean, the later part of the T-OAE is characterized by abundant occurrences of the brachiopod Soaresirhynchia, which exhibits characteristics of slow-growing, deep sea brachiopods. The unlikely success of Soaresirhynchia in a hyperthermal event is attributed here to low metabolic rate, which put it at an advantage over other species from shallow epicontinental environments with higher metabolic demand.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Temperature
/
Oceans and Seas
/
Adaptation, Physiological
/
Invertebrates
/
Hypoxia
Type of study:
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
Sci Rep
Year:
2020
Document type:
Article
Affiliation country:
United kingdom
Publication country:
ENGLAND
/
ESCOCIA
/
GB
/
GREAT BRITAIN
/
INGLATERRA
/
REINO UNIDO
/
SCOTLAND
/
UK
/
UNITED KINGDOM