Abstract:
:Isotopic studies of archived fish scales have tremendous potential to develop long-term retrospectives that provide important insights into how humans have altered aquatic ecosystems. However, fish specimens in museum archives and other repositories typically date to time periods when the impacts of industrial societies may have already caused profound environmental changes. Archaeological fish bones offer an opportunity to bridge this key temporal gap by providing samples spanning from the recent past to as far back as the Pleistocene. Collagen is the primary protein component of both fish scale and bone, but the comparability of isotopic compositions from these tissues has not been established experimentally. To lay the framework for integrating isotopic datasets from these tissues, we compare δ13C and δ15N of bone and scale collagen, as well as other tissues, from fish with life-time controlled diets. Results show that while there is no difference in δ13C between scale and bone collagen, there may be a very slight but meaningful inter-tissue offset in δ15N (<0.3‰). We discuss potential sources of δ15N variation in scale and bone collagen measurements. Because there is no difference in scale and bone δ13C, and the observed offset in δ15N is very small (less than analytical uncertainty in many studies), our findings demonstrate that collagen isotopic compositions from these tissues should be directly comparable when integrating datasets from modern and ancient samples to build more powerful, millennium-scale isotopic times series. In linking isotopic compositions of collagen from modern, historical (scales), and archaeological (bones) fish, our findings open the way for more nuanced contextualization of how ecosystems functioned prior to large-scale exploitation and how they have responded to mounting anthropogenic pressures in the intervening centuries.
journal_name
Mar Environ Resjournal_title
Marine environmental researchauthors
Guiry EJ,Hunt BPVdoi
10.1016/j.marenvres.2020.104982subject
Has Abstractpub_date
2020-09-01 00:00:00pages
104982eissn
0141-1136issn
1879-0291pii
S0141-1136(20)30152-5journal_volume
160pub_type
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