Stable carbon isotopes in freshwater mussel shells: Environmental record or marker for metabolic activity?

被引:81
|
作者
Geist, J [1 ]
Auerswald, K [1 ]
Boom, A [1 ]
机构
[1] Tech Univ Munich, Wissensch Zentrum Weihestephan, Wildlife Biol & Wildlife Management Unit, D-85350 Freising Weihenstephan, Germany
关键词
D O I
10.1016/j.gca.2005.03.010
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Mussel shells have been used in a number of paleoecological and environmental studies. The interpretation of stable carbon isotopic composition of shell material is still controversial. The carbon for shell carbonate precipitation can either be derived from ambient dissolved inorganic carbon (DIC), with shells recording environmental signals, or from metabolic CO2, with the potential to disguise environmental signals. To gain insight into this question, we investigated four nearly 100-yr long-term records of aragonite shells from an extant freshwater bivalve species, the endangered freshwater pearl mussel (Margaritifera margaritifera L.). Single growth increments of the outer prismatic and the inner nacreous zones were successfully and easily separated with a simple heat treatment for chronological analyses of delta C-13 in single layers of each zone. Autocorrelation and semivariance statistical methods reveal that mussels show distinct individual signal patterns, which extend up to 25 yr. Signal patterns are reliably reproduced with replicate samples from defined layers within one shell and show similar patterns with a slight offset for inner nacreous and outer prismatic layers for individual animals. Mussels exposed to the same environmental conditions exhibit distinct and contradictory signature patterns, which do not match between individuals. This observation can only be explained by strong metabolic influences on shell precipitation. Environmental changes in pH, temperature, electric conductivity and atmospheric carbon signature had no or little (< 5%) influence, whereas body tissue protein and body tissue delta C-13 signatures negatively correlated with the youngest produced shell delta C-13 signatures, indicating that respiration causes a preferential loss of light isotopes from body mass and an inverse enrichment in shell aragonite. Hence, the shells of the freshwater pearl mussel yield a long-term record of metabolic activity, whereas the use of delta C-13 in these shells as recorder for environmental signals is questionable. This may also be true for shells from other species, for which metabolic carbon incorporation has been acknowledged. Copyright (c) 2005 Elsevier Ltd.
引用
收藏
页码:3545 / 3554
页数:10
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