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dc.contributor.authorJohnson, Andrew
dc.contributor.authorValentine, Annemarie
dc.contributor.authorSchöne, Bernd
dc.contributor.authorLeng, Melanie
dc.contributor.authorSloane, Hilary
dc.contributor.authorJanekovic, Ivica
dc.date.accessioned2020-10-23T14:25:57Z
dc.date.available2020-10-23T14:25:57Z
dc.date.issued2020-09-02
dc.identifier.citationJohnson, A.L., Valentine, A.M., Schöne, B.R., Leng, M.J., Sloane, H.J. and Janeković, I., (2020). 'Growth-increment characteristics and isotopic (δ18O) temperature record of sub-thermocline Aequipecten opercularis (Mollusca: Bivalvia): Evidence from modern Adriatic forms and an application to early Pliocene examples from eastern England'. Palaeogeography, Palaeoclimatology, Palaeoecology, 561, pp. 1-16.en_US
dc.identifier.issn0031-0182
dc.identifier.doi10.1016/j.palaeo.2020.110046
dc.identifier.urihttp://hdl.handle.net/10545/625286
dc.description.abstractThe shell δ18O of young modern Aequipecten opercularis from the southern North Sea provides an essentially faithful record of seasonal variation in seafloor temperature. In this well-mixed setting, A. opercularis shell δ18O also serves as a proxy for seasonal variation in surface temperature. Individuals from less agitated (e.g. deeper) settings in a warm climate would not be expected to record the full seasonal range in surface temperature because of thermal stratification in summer. Such circumstances have been invoked to explain cool isotopic summer temperatures from early Pliocene A. opercularis of eastern England. Support for a sub-thermocline setting derives from high-amplitude variation in microgrowth-increment size, which resembles the pattern in sub-thermocline A. opercularis from the southern Mediterranean Sea. Here, we present isotope and increment profiles from further sub-thermocline individuals, live-collected from a location in the Adriatic Sea for which we provide modelled values of expected shell δ18O. We also present data from supra-thermocline shells from the English Channel and French Mediterranean coast. The great majority of sub-thermocline A. opercularis show high-amplitude variation in increment size, and winter and summer δ18O values are generally quite close to expectation. However, the relatively warm summer conditions of 2015 are not recorded, in most cases due to a break in growth, perhaps caused by hypoxia. The supra-thermocline shells show subdued increment variation and yield isotopic winter and summer temperatures quite close to the local directly measured values. A. opercularis shells therefore provide a fairly good isotopic record of ambient temperature (if not always of relatively warm summer conditions below the thermocline) and their hydrographic setting can be determined from increment data. Early Pliocene examples from eastern England can be interpreted as having lived in a setting below the thermocline, with a higher seasonal range in surface temperature than now in the adjacent southern North Sea.en_US
dc.description.sponsorshipAlexander von Humboldt Foundationen_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.urlhttps://doi.org/10.1016/j.palaeo.2020.110046.en_US
dc.subjectSclerochronology; Bivalve; Marine climate; Hydrography; Plioceneen_US
dc.titleGrowth-increment characteristics and isotopic (δ18O) temperature record of sub-thermocline Aequipecten opercularis (Mollusca:Bivalvia): evidence from modern Adriatic forms and an application to early Pliocene examples from eastern England.en_US
dc.typeArticleen_US
dc.contributor.departmentUniversity of Derbyen_US
dc.contributor.departmentNottingham Trent Universityen_US
dc.contributor.departmentUniversity of Mainz, 55128 Mainz, Germanyen_US
dc.contributor.departmentNational Environmental Isotope Facility, British Geological Survey, Keyworthen_US
dc.contributor.departmentUWA Oceans Institute, University of Western Australia, Crawley, WA 6009, Australiaen_US
dc.identifier.journalPalaeogeography, Palaeoclimatology, Palaeoecologyen_US
dcterms.dateAccepted2020-09-24
dc.author.detail700084en_US


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