scholarly journals Earliest known spatial competition between stromatoporoids: evidence from the Upper Ordovician Xiazhen Formation of South China

2019 ◽  
Vol 94 (1) ◽  
pp. 1-10
Author(s):  
Juwan Jeon ◽  
Kun Liang ◽  
Mirinae Lee ◽  
Stephen Kershaw
Keyword(s):  
South China ◽  
Spatial Competition ◽  
Competitive Interaction ◽  
Upper Ordovician ◽  
Species Analysis ◽  
Antagonistic Behavior

AbstractThe earliest known interpreted spatial competition between two species of stromatoporoids, Clathrodictyon cf. C. mammillatum (Schmidt, 1858) and Labechia sp. is found in the Upper Ordovician Xiazhen Formation at Zhuzhai, South China. The interaction between these taxa was initiated by settlement of Labechia sp. on the surface of Clathrodictyon cf. C. mammillatum. Distortions of the intraskeletal elements of stromatoporoids represented by abnormally large, wide cysts and thick cyst plates in Labechia sp. are observed, along with zigzag crumpled distorted laminae and antagonistic behavior of the skeleton in Clathrodictyon cf. C. mammillatum, indicating syn-vivo interactions. The growth of Labechia sp. was terminated by the overgrowth of Clathrodictyon cf. C. mammillatum, possibly reflecting the ecological superiority of Clathrodictyon cf. C. mammillatum over Labechia sp. The observations are interpreted as competitive interaction between stromatoporoids that was most likely facultative, thus most likely occurring by chance, but the interaction allows assessment of different growth behaviors of the stromatoporoid species. Analysis of the interaction provides evidence to improve understanding of the paleoecology and growth behaviors of early stromatoporoids.

Avitograptus species (Graptolithina) from the Hirnantian (uppermost Ordovician) Anji Biota of South China and the evolution of Akidograptus and Parakidograptus

2020 ◽  
Vol 94 (5) ◽  
pp. 955-965 ◽  
Author(s):  
Lucy A. Muir ◽  
Yuandong Zhang ◽  
Joseph P. Botting ◽  
Xuan Ma
Keyword(s):  
New Species ◽  
South China ◽  
Zhejiang Province ◽  
The Other ◽  
New Combination ◽  
Upper Ordovician ◽  
Additional Species ◽  
Evolutionary Changes

AbstractThe latest Ordovician to earliest Silurian graptolite Avitograptus avitus is important in the biostratigraphy of the Ordovician–Silurian boundary interval. Two additional species of Avitograptus are described from the sponge-dominated Anji Biota of the Upper Ordovician Wenchang Formation (Metabolograptus persculptus Biozone) of Zhejiang Province, South China. One species, Avitograptus akidomorphus new species, is new; the other, Avitograptus acanthocystus new combination, which was previously placed in Climacograptus, is herein assigned to Avitograptus. The former species may represent the ancestral akidograptid because it is identical in thecal form to Akidograptus, but differs in the development of the proximal end. The evolutionary changes from Avitograptus avitus to Akidograptus and Parakidograptus involved distal movement of the origins of th11 and th12, thecal elongation, and greater outward inclination of the thecal walls.UUID: http://zoobank.org/81c433a0-9069-48d2-ae72-1267400cbf77.

scholarly journals Research on the Competitive Strategy of Cross-Border E-Commerce Comprehensive Pilot Area Based on the Spatial Competition

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Bo Lu ◽  
Huipo Wang
Keyword(s):  
South China ◽  
North China ◽  
Bohai Sea ◽  
Spatial Competition ◽  
Service Area ◽  
State Council ◽  
Market Theory ◽  
Cross Border ◽  
Two Cities ◽  
Geographical Position

By now, 13 cross-border e-commerce comprehensive pilot areas have been approved by the State Council of China; Dalian and Tianjin are two of them. But with the development of the construction of the cross-border e-commerce comprehensive pilot areas, the competition between those pilot areas is inevitable. Dalian and Tianjin are located in the Bohai Sea and the distance between them is only 800 kilometers. For Dalian and Tianjin they are in thus competitive situations: first they have to compete with each other; second since they are located in Bohai Sea (North China), they have to compete with other cross-border e-commerce comprehensive pilot areas (South China). In this paper, our aim is to build models to provide best price strategies for these two cities. Based on the two-sided market theory and the geographical position, this paper builds two competitive theory models. Through the analyzing of the equilibrium, we get two main results: (1) according to different service area, the cities (Dalian and Tianjin) should have different price; (2) the two-sided market characters have an impact on their strategies.

Negative δ13Ccarb shifts in Upper Ordovician (Hirnantian) Guanyinqiao Bed of South China linked to diagenetic carbon fluxes

2017 ◽  
Vol 487 ◽  
pp. 430-446 ◽  
Author(s):  
Can Chen ◽  
Jiasheng Wang ◽  
Thomas J. Algeo ◽  
Zhou Wang ◽  
Shen Tu ◽  
...  
Keyword(s):  
South China ◽  
Carbon Fluxes ◽  
Upper Ordovician

Tubes or cell sheet? A 3-D reconstruction of Halysis Høeg, 1932, from the Upper Ordovician of South China

Facies ◽  
2012 ◽  
Vol 59 (1) ◽  
pp. 113-132 ◽  
Author(s):  
Konstantin Frisch ◽  
Axel Munnecke ◽  
Christian Schulbert ◽  
Yuandong Zhang
Keyword(s):  
South China ◽  
Cell Sheet ◽  
Upper Ordovician

scholarly journals Cyclostratigraphic Calibration of the Upper Ordovician (Sandbian–Katian) Pagoda and Linhsiang Formations in the Yichang Area, South China

2019 ◽  
Vol 93 (S3) ◽  
pp. 177-180 ◽  
Author(s):  
Yangyang ZHONG ◽  
Dongyang CHEN ◽  
Junxuan FAN ◽  
Huaichun WU ◽  
Qiang FANG ◽  
...  
Keyword(s):  
South China ◽  
Upper Ordovician

Diverse labechiid stromatoporoids from the Upper Ordovician Xiazhen Formation of South China and their paleobiogeographic implications

2021 ◽  
pp. 1-26
Author(s):  
Juwan Jeon ◽  
Kun Liang ◽  
Jino Park ◽  
Stephen Kershaw ◽  
Yuandong Zhang
Keyword(s):  
New Species ◽  
South China ◽  
Endemic Species ◽  
North China ◽  
Late Ordovician ◽  
Jiangxi Province ◽  
Upper Ordovician ◽  
Three New Species

Abstract A diverse labechiid stromatoporoid assemblage that includes 16 species in 8 genera was found in the Upper Ordovician Xiazhen Formation (mid–late Katian) at Zhuzhai, Jiangxi Province of South China. The assemblage is characterized by a combination of (1) North China provincial species succeeding from their origination in the Darriwilian, including Pseudostylodictyon poshanense Ozaki, 1938, Labechia shanhsiensis Yabe and Sugiyama, 1930, Labechia variabilis Yabe and Sugiyama, 1930, and Labechiella regularis (Yabe and Sugiyama, 1930) and (2) South China endemic species, including three new species (Labechia zhuzhainus Jeon n. sp., Labechiella beluatus Jeon n. sp., Sinabeatricea luteolus Jeon n. gen. n. sp.), and four species in open nomenclature (Rosenella sp., Cystostroma sp., Pseudostylodictyon sp., and Labechia sp.). The finding of Labechiella gondwanense Jeon n. sp., Stylostroma bubsense Webby, 1991, Stylostroma ugbrookense Webby, 1991, and Thamnobeatricea gouldi Webby, 1991 in the formation indicates that Tasmania was closely related to South China and had a closer paleobiogeographical relation with peri-Gondwanan terranes than with Laurentia. In addition, the occurrences of Labechia altunensis Dong and Wang, 1984 and Stylostroma species support a close biogeographic link between Tarim and South China through the Middle to Late Ordovician interval, corresponding with the results from other fossil groups such as brachiopods, conodonts and chitinozoans. The diverse labechiids from the Xiazhen Formation improve our understanding of the diversity of Ordovician stromatoporoids in peri-Gondwanan terranes and the biogeographic affinities among Australia (especially Tasmania), Tarim, and South China. UUID: http://zoobank.org/4f46c91b-fa4c-4fe5-bea9-e409f1785677

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