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Title: Unlocking preservation bias in the amber insect fossil record through experimental decay

Journal Article · · PLoS ONE
ORCiD logo [1];  [2];  [3];  [4];  [5];  [4];  [5]
  1. Univ. of Leicester (United Kingdom); Univ. of Bonn (Germany)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Univ. of Leicester (United Kingdom); John Moores Univ., Liverpool (United Kingdom)
  4. Univ. of Michigan, Ann Arbor, MI (United States)
  5. Univ. of Leicester (United Kingdom)

Fossils entombed in amber are a unique resource for reconstructing forest ecosystems, and resolving relationships of modern taxa. Such fossils are famous for their perfect, life-like appearance. However, preservation quality is vast with many sites showing only cuticular preservation, or no fossils. The taphonomic processes that control this range are largely unknown; as such, we know little about potential bias in this important record. Here we employ actualistic experiments, using, fruit flies and modern tree resin to determine whether resin type, gut microbiota, and dehydration prior to entombment affects decay. We used solid phase microextraction gas chromatography-mass spectrometry (SPME GC-MS) to confirm distinct tree resin chemistry; gut microbiota of flies was modified using antibiotics and categorized though sequencing. Decay was assessed using phase contrast synchrotron tomography. Resin type demonstrates a significant control on decay rate. The composition of the gut microbiota was also influential, with minor changes in composition affecting decay rate. Dehydration prior to entombment, contrary to expectations, enhanced decay. Our analyses show that there is potential significant bias in the amber fossil record, especially between sites with different resin types where ecological completeness and preservational fidelity are likely affected.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1473585
Journal Information:
PLoS ONE, Vol. 13, Issue 4; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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Cited By (1)

Ancient amino acids from fossil feathers in amber journal April 2019