Oxygen isotopes in terrestrial gastropod shells track Quaternary climate change in the American Southwest

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F21%3A00123431" target="_blank" >RIV/00216224:14310/21:00123431 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1017/qua.2021.18" target="_blank" >https://doi.org/10.1017/qua.2021.18</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1017/qua.2021.18" target="_blank" >10.1017/qua.2021.18</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Oxygen isotopes in terrestrial gastropod shells track Quaternary climate change in the American Southwest

Popis výsledku v původním jazyce

Recent studies have shown the oxygen isotopic composition (delta O-18) of modern terrestrial gastropod shells is determined largely by the delta O-18 of precipitation. This implies that fossil shells could be used to reconstruct the delta O-18 of paleo-precipitation as long as the isotopic system, including the hydrologic pathways of the local watershed and the gastropod systematics, is well understood. In this study, we measured the delta O-18 values of 456 individual gastropod shells collected from paleowetland deposits in the San Pedro Valley, Arizona that range in age from ca. 29.1 to 9.8 ka. Isotopic differences of up to 2 parts per thousand were identified among the four taxa analyzed (Succineidae, Pupilla hebes, Gastrocopta tappaniana, and Vallonia gracilicosta), with Succineidae shells yielding the highest values and V. gracilicosta shells exhibiting the lowest values. We used these data to construct a composite isotopic record that incorporates these taxonomic offsets, and found shell delta O-18 values increased by similar to 4 parts per thousand between the last glacial maximum and early Holocene, which is similar to the magnitude, direction, and rate of isotopic change recorded by speleothems in the region. These results suggest the terrestrial gastropods analyzed here may be used as a proxy for past climate in a manner that is complementary to speleothems, but potentially with much greater spatial coverage.

Název v anglickém jazyce

Oxygen isotopes in terrestrial gastropod shells track Quaternary climate change in the American Southwest

Popis výsledku anglicky

Recent studies have shown the oxygen isotopic composition (delta O-18) of modern terrestrial gastropod shells is determined largely by the delta O-18 of precipitation. This implies that fossil shells could be used to reconstruct the delta O-18 of paleo-precipitation as long as the isotopic system, including the hydrologic pathways of the local watershed and the gastropod systematics, is well understood. In this study, we measured the delta O-18 values of 456 individual gastropod shells collected from paleowetland deposits in the San Pedro Valley, Arizona that range in age from ca. 29.1 to 9.8 ka. Isotopic differences of up to 2 parts per thousand were identified among the four taxa analyzed (Succineidae, Pupilla hebes, Gastrocopta tappaniana, and Vallonia gracilicosta), with Succineidae shells yielding the highest values and V. gracilicosta shells exhibiting the lowest values. We used these data to construct a composite isotopic record that incorporates these taxonomic offsets, and found shell delta O-18 values increased by similar to 4 parts per thousand between the last glacial maximum and early Holocene, which is similar to the magnitude, direction, and rate of isotopic change recorded by speleothems in the region. These results suggest the terrestrial gastropods analyzed here may be used as a proxy for past climate in a manner that is complementary to speleothems, but potentially with much greater spatial coverage.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10700 - Other natural sciences

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Quaternary Research

ISSN

0033-5894

e-ISSN

1096-0287

Svazek periodika

104

Číslo periodika v rámci svazku

NOV

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

43-53

Kód UT WoS článku

000720829800006

EID výsledku v databázi Scopus

2-s2.0-85115982210