期刊
HOLOCENE
卷 12, 期 5, 页码 629-634出版社
ARNOLD, HODDER HEADLINE PLC
DOI: 10.1191/0959683602hl564rr
关键词
freshwater snails; Mollusca; oxygen isotopes; carbon isotopes; lakes; lacustrine carbonate; Holocene; Turkey
资金
- NERC [nigl010001] Funding Source: UKRI
The oxygen and carbon stable-isotope ratios from fossil snail shells within a small intramontane lake in southwest Turkey are used to highlight the potential, and problems, of using freshwater snail carbonate as a palaeoenvironmental proxy. Two species (Gyraulus piscinarum and Valvata cristata) yielded different isotope ratios at the same sampling intervals, probably due to differences in water-isotope composition between different microhabitats. Isotope ratios from a number of individual shells from the same sampling intervals (representing similar to7-25 years), show large ranges (up to 8parts per thousand for delta(18)O) for each species. Only by analysis of a significant number of species-specific shells (>5) from each sampling interval can a true understanding of environmental change be obtained. Averages of the data provide an insight into longer-term climatic variation while the ranges provide an estimate of short-term (decadal) environmental variability.
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