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121.
The fossil clam shrimp genus Xibeiestheria Wang in Shen et al., 1982, a component of the well-known Early Cretaceous Yanjiestheria fauna, was originally described from the lower Aptian Jingchuan Formation of Yanchi County, Ningxia Hui Autonomous Region of northwestern China. The morphological re-examination under an SEM of the holotype of the type species Xibeiestheria pora Wang in Shen et al., 1982 has revealed new taxonomic features not previously recognized. These include: (1) growth lines with serrated lower margins, having a row of small pores; (2) widely spaced radial lirae intercalated cross bars on growth bands in the dorsal part of the carapace; (3) fine reticulum occurring within coarse reticulation on growth bands in the middle part of the carapace; (4) puncta radially aligned along the widely spaced radial lirae on growth bands in the lower part of the carapace. 相似文献
122.
DIETARY MANGANESE REQUIREMENT OF P. VANNAMEI 总被引:1,自引:0,他引:1
刘发义 《中国海洋湖沼学报》1997,(2)
M0DUonONManganeseisanessentialelernentfororganismss.TherearernanypublishedreportS0ntheMnrequdritSoritSdrionfishes,indudingrainb0wtrout,channelcatfish,Atianticsalmon,cornmncarp,grasscarp,tilapia,Ctc.Kanamwaetal.(l984)andLiCtal.(l992)reportedtheresultSoftheiraseawhonthernanganeserequdritSofjuvenileP.japonicusandP.chinensiS.Davisandhawrence(l99O)studndthetheofdietaryman-ganeseonP.vannameibydeletionofMnfromthendneralpedinasdri9udrieddiet.ThepresentstudyontheefhaofgtadedleveIs0frnanganeses… 相似文献
123.
So far,Artemia populations in solar saltponds of southern France have been considered as belonging to the Old World parthenogenetic strain.
However, two populations sampled monthly in abandoned salinas of Sète-Villeroy and Villeneuve appear to be bisexual throughout
their life-cycle. Their sex ratio regularly fluctuates near equilibrium, and mating, present throughout life, is very common
in early winter. Morphological characteristics, particularly the male frontal knobs structure, are discussed in relation to
the diploid bisexual Mediterranean strain,Artemia tunisiana, which is distributed around the Mediterranean basin. The existence of sexual populations is discussed in regard to variation
in environmental conditions in abandoned salinas. 相似文献
124.
125.
The zircon U-Pb SHRIMP technique was applied to measure the age of the monzonite granite-porphyry from the Bangpu porphy deposits in the eastern Gangdese porphyry belt. It was obtained that the 206Pb/238 U mean age is 13. 9 ±0. 3 Ma (MSWD = 3. 05), which belongs to the late period of Himalaya. The Bangpu monzonite granite-porphyry was formed during the period of ore-bearing porphyries forming in the Gangdese metallogenic belt to the extension environment of post-collision (12-18 Ma). Our new data suggest that the Bangpu monzonite granite-porphyry shared similar metallogenic dynamics settings to the Gangdese copper belt, which belongs to a rapid outbreak of large-scale mineralization process. Our new result is very important in confirming the active time of the Gangdese magma, provides chronological data and new inspiration for evolution studies of the whole Gangdese metallogenic belt. 相似文献
126.
Nguyen Phuc Cam Tu Nguyen Ngoc Ha Tokutaka Ikemoto Bui Cach Tuyen Shinsuke Tanabe Ichiro Takeuchi 《Marine pollution bulletin》2008,57(6-12):858
The goal of the present study was to examine the specific bioaccumulation of 22 trace elements in muscle, exoskeleton and hepatopancreas of black tiger shrimp Penaeus monodon from the Mekong River Delta (MRD), and the South Key Economic Zone (SKEZ), South Vietnam. The general tendency in most trace element concentrations among different tissues were hepatopancreas > exoskeleton > muscle. Comparisons of trace element levels in tissues between the two regions showed that concentrations of Se in muscle and As in all three tissues were higher in SKEZ; whereas in MRD, the higher concentrations of most elements such as Mn, Cu, Cd, Ba, Hg, were observed in tissues. These geographical variations in trace element levels may reflect the differences in human activities between the two regions of South Vietnam. The target hazard quotient (THQ) values for trace elements (<1) indicate that local residents are not exposed to potential health risks via the consumption of shrimp. 相似文献
127.
128.
中国对虾成虾肠道微生物区系 总被引:8,自引:0,他引:8
对野生健康中国对虾成虾肠道微生物区系进行了研究.从其肠道中分离出47株菌,它们分别属于弧菌属、发光杆菌属、不动杆菌属、假单胞菌属、黄杆菌属、气单胞菌属、屈挠杆菌属和色杆菌属8个属.其中弧菌属和发光杆菌属在整个肠道中为优势菌属,不动杆菌属和假单胞菌属为次优势菌属,黄杆菌属、气单胞菌属、屈挠杆菌属和色杆菌属为非优势菌属.在对虾的整个肠道中,前肠和中肠的优势菌属为弧菌属,而后肠的优势菌属为发光杆菌属.在弧菌属中溶藻胶弧菌、漂浮弧菌和坎贝氏弧菌为优势菌,哈唯氏弧菌为非优势菌.前肠、中肠和后肠的菌量分别为1.3×105、2.8×105和1.1×104cfu/虾体. 相似文献
129.
不同卤虫卵孵化的比较研究 总被引:1,自引:0,他引:1
分别选取进口质量较好卤虫卵、进口质量较差卤虫卵、台湾产卤虫卵和天津产卤虫卵进行标准条件孵化、自然条件孵化及去壳卵孵化.结果发现,天津产卤虫卵,颜色、形状正常,每1 g卵数为19×104,孵化率最高,达94.0%.质量较差的进口卵,颜色、形状不太正常,每1 g卵数为35×104,孵化率最差.在标准和自然条件下,卤虫卵均在36h达最高孵化率,但标准条件下的孵化率高.去壳卵的孵化率最高,孵化24 h时,最高孵化率达96.8%比标准条件孵化时快近12 h.但去壳卵易结团或结块下沉,不易漂浮. 相似文献
130.
青虾生长规律与群体组成的研究 总被引:13,自引:3,他引:10
报道了上海川沙县孙桥河道青虾的生长呈明显的阶段性,如雄虾的第一阶段(1990年6—11月)的生长方程为L_t=3.38[1-e~(-0.4943(t+0.1674)];第二阶段(1991年2—6月)的生长方程为L_t=6.57/(1+e~(2.1805-0.2787t);它们的拐点分别为2.07月龄和11.97月龄。渔获群体分析结果表明,月龄为0-15月,体长范围为1.30—6.58cm,体重范围为0.060—13.39g;一年出现两个群体,其中夏季群体生活期从当年7月至翌年10月,数量大,占群体数量80%以上;秋季群体生活期从当年9月至翌年12月,约占群体数量20%左右。群体中一般雄虾数量多于雌虾数量,月性比(?)在0.61—1.35之间变动。 相似文献