遇见澄江海菜花

早就听说广西都安有一条会开花的河,这条河就是澄江。那花就是海菜花,又名“水性杨花”,多年前曾在丽江吃过,真想不到,在广西也有。那天午后,从都安北下高速,穿过乡村简易路,很快就来到位于都安高岭镇三合村的响水关,都安著名景点之一。

澄江化石库中的双胚层动物新知

作为观察寒武纪大爆发主幕奥秘的最佳科学窗口,澄江化石库展示了三胚层动物(即两侧对称动物)首次全面大辐射的历史产物,让学术界终于看到了已知最古老的同时包括原口类和后口类两大支系的动物谱系庞大“树冠”的主体轮廓,从而给许多较高级动物类群的起源和早期演化研究提供了十分重要的信息。然而,该化石宝库中却很少见到作为“树干”的双胚层动物(即辐射动物)的化石记录,这给“真动物”的源头探秘蒙上了阴影。尽管广布于前寒武纪末期全球浅海域的“文德生物群”一直被认为是动物界早期一次“失败的演化试验”的牺牲品,但其中一支成功延续到早寒武世的春光虫(Stromatoveris)具有叠覆状梳齿构造,很可能代表着栉水母类的一类原始祖先。文中描述新的羽毛状动物王氏澄江海笔(Chengjiangopennawangii)不同于春光虫,前者具有彼此分离的羽枝,且羽枝上保存了排列规整的珊瑚个体虫室,因而与现代八射珊瑚中海笔类的形态学特征十分一致;新的谱系分析显示,它应该代表刺胞动物门中的一个原始类群。

The Occurrence of Longfengshania in the Early Cambrian from Haikou, Yunnan, China

Well preserved Early Cambrian small individual megascopic carbonaceous algal fossils have been found from the Chengjiang Biota. This paper deals with the new megascopic algal fossils in the Early Cambrian also from Chengjiang Biota at Ercai Village, Haikou, Kunming, Yunnan, southwest China. Two new taxa, Longfengshania cordata sp. nov. and Plantulaformis sinensis gen. et sp. nov. are described here in detail. These new findings show that the Chengjiang Biota is high in species diversity of fossil algae and might offer new evidence for a better understanding of the Cambrian explosive biological evolution. Moreover, the fossils described here might belong to the megaalgal fossils according to detailed morphological study on the relationships of Longfengshania. Additionally, the occurrence of Longfengshania in the early Cambrian and the Neoproterozoic probably indicates a wide ecological tolerance and flexibility and apparently reflects its evolutionary conservation and a high degree of inherent genetic stability.

建立抚仙湖自然保护区的重要意义初探

1、抚仙湖自然概况及问题的提出抚仙湖,又名澄江海,位于澄江、江川、华宁三县之间,地理位置为102°19′～102°57′E,24°21′～24°38′N.属珠江流域西江水系.湖面海拔1721米,呈南北向倒葫芦状,东南宽约10km,最窄处仅4km,南北长约30km,面积212km^2,径流面积为1084km^2(含星去湖).湖区年平均气温17℃,年平均降水量约890毫米.湖泊平均水深87米,最大水深151.5米。