气候变化领域集成服务门户(CCPortal): Paleoecology and proliferation of the bivalve Chondrodonta joannae (Choffat) in the upper Cenomanian (Upper Cretaceous) Adriatic Carbonate Platform of Istria (Croatia)

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DOI	10.1016/j.palaeo.2020.109703
	Paleoecology and proliferation of the bivalve Chondrodonta joannae (Choffat) in the upper Cenomanian (Upper Cretaceous) Adriatic Carbonate Platform of Istria (Croatia)
	Posenato R.; Frijia G.; Morsilli M.; Moro A.; Del Viscio G.; Mezga A.
发表日期	2020
ISSN	0031-0182
卷号	548
英文摘要	Chondrodonta joannae (Choffat) is a morphologically variable oyster-like bivalve with a predominately calcitic shell. An exceptional exposure of C. joannae-bearing strata of late Cenomanian age crops out along the seaside in northern Istria (Croatia) and permits a taphonomical and functional analysis in order to define the life habit and growth strategies of this bivalve. The C. joannae population from the studied succession is characterized by highly-elongated, large and curved shells, reaching about 50 cm in height and 5 cm in length. This shell shape is typical of the club-like bivalve morphotype, which was adapted to soft-bottom substrates with high sediment accumulation. The shell is slightly inequivalve and characterized by a reduced body cavity, a few centimetres high, and a dorsal region up to 10 times longer. The shell opening mechanism was mostly based on the resilium located between the chondrophores which protrude in the body cavity. The abandoned dorsal cavity is filled by a calcite hinge plate, the ventral edge of which acted as fulcrum for the valve flexibility. In the hinge plate, the function of chondrophores changed. They acted as a hinge to keep tightly interlocked the valves, which considerably emerged above the sediment-water interface. The individuals were arranged in low shrub-type congregations, which produced low-relief mounds. The functional morphology and taphonomic signature suggest that C. joannae individuals collected food at a greater distance from the bottom with respect to the co-occurring rudists. We speculate that the C. joannae proliferation could be related to a late Cenomanian phase of environmental instability predating the OAE2 with fluctuating climatic conditions and ocean fertility. © 2020 Elsevier B.V.
英文关键词	Epifaunal tiering; Functional morphology; OAE 2; Rudists; Taphonomy
语种	英语
scopus关键词	bivalve; calcite; Cenomanian; functional morphology; geoaccumulation; morphotype; paleoecology; succession; taphonomy; Istria; Bivalvia; Chondrophora; Ostreidae
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150519
作者单位	Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, Via Saragat 1, Ferrara, 44121, Italy; University of Zagreb, Faculty of Science, Department of Geology, Horvatovac 102a, Zagreb, 10000, Croatia
推荐引用方式 GB/T 7714	Posenato R.,Frijia G.,Morsilli M.,et al. Paleoecology and proliferation of the bivalve Chondrodonta joannae (Choffat) in the upper Cenomanian (Upper Cretaceous) Adriatic Carbonate Platform of Istria (Croatia)[J],2020,548.
APA	Posenato R.,Frijia G.,Morsilli M.,Moro A.,Del Viscio G.,&Mezga A..(2020).Paleoecology and proliferation of the bivalve Chondrodonta joannae (Choffat) in the upper Cenomanian (Upper Cretaceous) Adriatic Carbonate Platform of Istria (Croatia).Palaeogeography, Palaeoclimatology, Palaeoecology,548.
MLA	Posenato R.,et al."Paleoecology and proliferation of the bivalve Chondrodonta joannae (Choffat) in the upper Cenomanian (Upper Cretaceous) Adriatic Carbonate Platform of Istria (Croatia)".Palaeogeography, Palaeoclimatology, Palaeoecology 548(2020).