Arthropodan syuinclusions in the Late Eocene Rovno amber were examined using x^2 to reveal correlation of the component groups （some taxa of Diptera, ants, aphids, and mites） supposedly indicative of the biocoenotic...Arthropodan syuinclusions in the Late Eocene Rovno amber were examined using x^2 to reveal correlation of the component groups （some taxa of Diptera, ants, aphids, and mites） supposedly indicative of the biocoenotic relationships in the ancient amber forest. Three tightly correlated groups were identified, representing a putative aerial plankton guild （Chironomidae ＋ Ceratopogonidae） and two tree-trunk guilds, one of which （Dolichopodidae ＋ Germaraphis） is possibly connected to more open or/and more hygrophilous habitats than the other （Sciara zone Diptera ＋ ＂Acarus＂ rhombeus）. The ants were not linked with any of the above components.展开更多
Located northwest of the Jiangshan-Shaoxing Fault Zone,western and northwestern Zhejiang and northeastern Jiangxi provinces experienced major changes in bio-and litho-facies and paleogeography through the Ordovician-S...Located northwest of the Jiangshan-Shaoxing Fault Zone,western and northwestern Zhejiang and northeastern Jiangxi provinces experienced major changes in bio-and litho-facies and paleogeography through the Ordovician-Silurian transition (late Katian,Hirnantian,and early Rhuddanian),as manifested by stratigraphic,paleontologic and synecologic records.Three geographic units under consideration are South,Central,and North areas.The western margin of the South area was occupied by the Huaiyu Mountains,whereas the other two parts were covered by the Zhe-Gan Sea during late Katian (Late Ordovician) time.In the early stage of the Changwu Formation deposition (late Katian),the sea was deepening northeastward,but with shallower conditions in the southwest and deeper conditions in the northeast.During mid to late stages of Changwu Formation deposition (latest Katian),the sea became much shallower and the sea bottom was uplifted substantially,which occurred somewhat prior to the global trend.During the Hirnantian (latest Ordovician) and early Rhuddanian (earliest Silurian),the study region became a shallow bay under expansion of the Cathaysian Oldland.There occurred a major drop of sea level and great changes in benthic biota with the occurrence of many new immigrants through the Ordovician-Silurian transition,which are closely related to a unique regional orogeny.The Yangtze and Cathaysian blocks may have amalgamated within the South China Paleoplate during this interval to cause the continuous uplifting and northwestward expansion of the Cathaysian Oldland.展开更多
基金supported in part by the RFBR Grant #09-04- 01241 and the Presidium RAS Program"Origin and evolution of Biosphere"
文摘Arthropodan syuinclusions in the Late Eocene Rovno amber were examined using x^2 to reveal correlation of the component groups （some taxa of Diptera, ants, aphids, and mites） supposedly indicative of the biocoenotic relationships in the ancient amber forest. Three tightly correlated groups were identified, representing a putative aerial plankton guild （Chironomidae ＋ Ceratopogonidae） and two tree-trunk guilds, one of which （Dolichopodidae ＋ Germaraphis） is possibly connected to more open or/and more hygrophilous habitats than the other （Sciara zone Diptera ＋ ＂Acarus＂ rhombeus）. The ants were not linked with any of the above components.
基金supported by Chinese Academy of Sciences (Grant No.KZCX2-YW-Q05-01)National Natural Science Foundation of China(Grant No.40825006)+1 种基金Ministry of Science and Technology (Grant Nos.2006CB806402,2006 FY120300-5)Department of Land and Resources of Zhejiang (Grant No.200711)
文摘Located northwest of the Jiangshan-Shaoxing Fault Zone,western and northwestern Zhejiang and northeastern Jiangxi provinces experienced major changes in bio-and litho-facies and paleogeography through the Ordovician-Silurian transition (late Katian,Hirnantian,and early Rhuddanian),as manifested by stratigraphic,paleontologic and synecologic records.Three geographic units under consideration are South,Central,and North areas.The western margin of the South area was occupied by the Huaiyu Mountains,whereas the other two parts were covered by the Zhe-Gan Sea during late Katian (Late Ordovician) time.In the early stage of the Changwu Formation deposition (late Katian),the sea was deepening northeastward,but with shallower conditions in the southwest and deeper conditions in the northeast.During mid to late stages of Changwu Formation deposition (latest Katian),the sea became much shallower and the sea bottom was uplifted substantially,which occurred somewhat prior to the global trend.During the Hirnantian (latest Ordovician) and early Rhuddanian (earliest Silurian),the study region became a shallow bay under expansion of the Cathaysian Oldland.There occurred a major drop of sea level and great changes in benthic biota with the occurrence of many new immigrants through the Ordovician-Silurian transition,which are closely related to a unique regional orogeny.The Yangtze and Cathaysian blocks may have amalgamated within the South China Paleoplate during this interval to cause the continuous uplifting and northwestward expansion of the Cathaysian Oldland.
