Composition Systematics in the Exoskeleton of the American Lobster, Homarus americanus and Implications for Malacostraca

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dc.contributor.authorMergelsberg, Sebastian T.en
dc.contributor.authorUlrich, Robert N.en
dc.contributor.authorXiao, Shuhaien
dc.contributor.authorDove, Patricia M.en
dc.contributor.departmentGeosciencesen
dc.date.accessioned2019-10-25T12:59:35Zen
dc.date.available2019-10-25T12:59:35Zen
dc.date.issued2019-04-05en
dc.description.abstractStudies of biominerals from the exoskeletons of lobsters and other crustaceans report chemical heterogeneities across disparate body parts that have prevented the development of composition-based environmental proxy models. Anecdotal evidence, however, suggests underlying composition systematics may exist in the mineral component of this biocomposite material. We test this idea by designing a protocol to separately extract the mineral [amorphous calcium carbonate (ACC) plus calcite] and organic (chitin plus protein) fractions of the exoskeleton. The fractions were analyzed by ICP-OES and other wet chemistry methods to quantify Mg, Ca, and P contents of the bulk, mineral, and organic matrix. Applying this approach to the exoskeleton for seven body parts of the American lobster, Homarus americanus, we characterize the chemical composition of each fraction. The measurements confirm that Mg, P, and Ca concentrations in lobster exoskeletons are highly variable. However, the ratios of Mg/Ca and P/Ca in the mineral fraction are constant for all parts, except the chelae (claws), which are offset to higher values. By normalizing concentrations to obtain P/Ca and Mg/Ca, we show that all body parts conserve P/Mg to 1.27 +/- 0.30. The findings suggest lobsters hold promise as a novel class of animals that record composition systematics within their CaCO3 biominerals. Parallel structural analyses of the bulk samples confirm a large proportion of ACC relative to calcite in the mineral fractions for each body part using high-energy X-ray diffraction and PDF analysis. There is no evidence for a phosphate phase. Returning to compositions reported for other marine (crab, lobster, and marine shrimp) and terrestrial (pillbug) crustaceans, we find evidence for similar Mg/Ca and P/Ca patterns in these organisms. The relationships provide a basis for developing new proxies for environmental reconstructions using animals from the class Malacostraca and provide insights into how composition may be optimized to meet functional requirements of the mineral fraction in exoskeletons. Compositional variability, and hence differential solubility, suggests a thermodynamic basis for the taphonomic bias that is observed in the fossil record.en
dc.description.notesThis project was funded by the United States DOE Office of Basic Energy Sciences Award BES-FG02-00ER15112 and used resources of the Advanced Photon Source, a United States Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. X-ray scattering experiments were performed at beamline 11-ID-B by F. Marc Michel.en
dc.description.sponsorshipUnited States DOE Office of Basic Energy Sciences Award [BES-FG02-00ER15112]; DOE Office of Science by Argonne National LaboratoryUnited States Department of Energy (DOE) [DE-AC02-06CH11357]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.3389/feart.2019.00069en
dc.identifier.issn2296-6463en
dc.identifier.otherUNSP 69en
dc.identifier.urihttp://hdl.handle.net/10919/95055en
dc.identifier.volume7en
dc.language.isoenen
dc.publisherFrontiersen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectbiomineralizationen
dc.subjectcalcium carbonateen
dc.subjectamorphous calcium carbonateen
dc.subjectACCen
dc.subjecttaphonomyen
dc.subjectcrustaceansen
dc.subjectAmerican lobsteren
dc.titleComposition Systematics in the Exoskeleton of the American Lobster, Homarus americanus and Implications for Malacostracaen
dc.title.serialFrontiers in Earth Scienceen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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