Universität zu Köln

McCormack, Jeremy ORCID: 0000-0002-5995-877X, Viehberg, Finn ORCID: 0000-0003-0253-2222, Akdemir, Derya ORCID: 0000-0003-1253-3376, Immenhauser, Adrian ORCID: 0000-0001-9494-2450 and Kwiecien, Ola ORCID: 0000-0001-6018-9181 (2019). Ostracods as ecological and isotopic indicators of lake water salinity changes: the Lake Van example. Biogeosciences, 16 (10). S. 2095 - 2115. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1726-4189

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Abstract

Ostracods are common lacustrine calcitic microfossils. Their faunal assemblage and morphological characteristics are important ecological proxies, and their valves are archives of geochemical information related to palaeoclimatic and palaeohydrological changes. In an attempt to assess ostracod ecology (taxonomic diversity and valve morphology) combined with valve geochemistry (delta O-18 and delta C-13) as palaeosalinity indicators, we analysed sedimentary material from the International Continental Scientific Drilling Program (ICDP) Ahlat Ridge site from a terminal and alkaline lake, Lake Van (Turkey), covering the last 150 kyr. Despite a low species diversity, the ostracod faunal assemblage reacted sensitively to changes in the concentration of total dissolved salts in their aquatic environment. Limnocythere inopinata is present throughout the studied interval, while Limnocythere sp. A is restricted to the Last Glacial period and related to increased lake water salinity and alkalinity. The presence of species belonging to the genus Candona is limited to periods of lower salinity. Valves of Limnocytherinae species (incl. L. inopinata) display nodes (hollow protrusions) during intervals of increased salinity. Both the number of noded valves and the number of nodes per valve appear to increase with rising salinity, suggesting that node formation is related to hydrological changes (salinity and/or alkalinity). In contrast to Lake Van's bulk delta O-18 record, the delta O-18 values of ostracod valves do record relative changes of the lake volume, with lower values during high lake level periods. The delta C-13 values of different species reflect ostracod habitat preferences (i.e. infaunal vs. epifaunal) but are less sensitive to hydrological changes. However, combined with other proxies, decreasing Holocene delta C-13 values may indicate a freshening of the lake water compared to the low lake level during the Last Glacial period. The Lake Van example underscores the significance and value of coupling ostracod ecology and valve geochemistry in palaeoenvironmental studies of endorheic lake basins.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code McCormack, Jeremy UNSPECIFIED orcid.org/0000-0002-5995-877X UNSPECIFIED Viehberg, Finn UNSPECIFIED orcid.org/0000-0003-0253-2222 UNSPECIFIED Akdemir, Derya UNSPECIFIED orcid.org/0000-0003-1253-3376 UNSPECIFIED Immenhauser, Adrian UNSPECIFIED orcid.org/0000-0001-9494-2450 UNSPECIFIED Kwiecien, Ola UNSPECIFIED orcid.org/0000-0001-6018-9181 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-148096
DOI:	10.5194/bg-16-2095-2019
Journal or Publication Title:	Biogeosciences
Volume:	16
Number:	10
Page Range:	S. 2095 - 2115
Date:	2019
Publisher:	COPERNICUS GESELLSCHAFT MBH
Place of Publication:	GOTTINGEN
ISSN:	1726-4189
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Geosciences
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HIGH-RESOLUTION POLLEN; HOLOCENE ENVIRONMENTAL-CHANGE; CYPRIDEIS-TOROSA JONES; EASTERN ANATOLIA; ABRUPT CLIMATE; SHELL CHEMISTRY; TRACE-ELEMENT; OXYGEN; RECORD; CRUSTACEA Multiple languages Ecology; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14809