A revision of Eumedonus H. Milne Edwards, 1834 and Gonatonotus White, 1847 (Crustacea: Decapoda: Brachyura: Eumedonidae), two genera of crabs symbiotic with sea urchins

The eumedonid genera Eumedonus H. Milne Edwards, 1834 and Gonatonotus White, 1847, are revised. Members of both genera are obligate symbionts with sea urchins. Eumedonus is separated from Gonatonotus mainly by the presence or absence of crests on the merus of the ambulatory legs. Eumedonus, as here defined, contains five species, viz. E. niger H. Milne Edwards, 1834 (type species), E. vicinus Rathbun, 1918, E. zebra Alcock, 1895, E. brevirhynchus n. sp., and E. intermedius n. sp. Gonatonotus, as here re-diagnosed, includes three species, viz. G. pentagonus White, 1847 (type species), G. granulosus (MacGilchrist, 1905), n. comb. and G. nasutus n. sp.     

吉林省集安地区蝴蝶种类调查

在吉林省集安地区采用人工捕捉法捕获蝶类,对捕获的蝶类进行分类鉴定,共发现蝶类8科64属104种.该地区大多数为古北区种类,占全部种类的53.84%,东洋古北共有种占全部种类的35.58%,东洋区种占全部种类的5.77%,广布种占全部种类的4.81%.其中,虎凤蝶属国家二级保护动物.     

云南苍山管巢蛛属一新种记述(蜘蛛目:管巢蛛科)

报道采自云南大理苍山的管巢蛛属(Clubiona Latreille,1804)1新种蜘蛛:角管巢蛛(Clubiona bucerasp.nov.)。模式标本保存在大理学院生物标本馆。文中测量单位为mm。     

郑州黄河湿地自然保护区植被群落物种多样性调查

在黄河湿地自然保护区调查的68个样方中,共统计到61种维管植物,可划分为7个分布区类型。分布于水域中的植被群落丰富度高于陆地上植被群落丰富度。群系生境差异是黄河湿地植被多样性形成的主要原因。     

Proinsulin C-peptide and its analogues induce intracellular Ca2+ increases in human renal tubular cells

Based on the findings that proinsulin C-peptide binds specifically to cell membranes, we investigated the effects of C-peptide and related molecules on the intracellular Ca²⁺ concentration ([Ca²⁺]_i) in human renal tubular cells using the indicator fura-2/AM. The results show that human C-peptide and its C-terminal pentapeptide (positions 27–31, EGSLQ), but not the des (27–31) C-peptide or randomly scrambled C-peptide, elicit a transient increase in [Ca²⁺]_i. Rat C-peptide and rat C-terminal pentapeptide also induce a [Ca²⁺]_i response in human tubular cells, while a human pentapeptide analogue with Ala at position 1 gives no [Ca²⁺]_i response, and those with Ala at positions 2–5 induce responses with different amplitudes. These results define a species cross-reactivity for C-peptide and demonstrate the importance of Glu at position 1 of the pentapeptide. Preincubation of cells with pertussis toxin abolishes the effect on [Ca²⁺]_i by both C-peptide and the pentapeptide. These results are compatible with previous data on C-peptide binding to cells and activation of Na⁺,K⁺ATPase. Combined, all data show that C-peptide is a bioactive peptide and suggest that it elicits changes in [Ca²⁺]_i via G-protein-coupled pathways, giving downstream enzyme effects. Received 13 May 2002; accepted 16 May 2002     

野生动物兴衰动力学分析

生态系统是远离平衡的开放系统,生物界的竞争和发展十分复杂。在“平衡－不平衡－平衡”循环中,有的物种繁荣,长盛不衰;有的地的种尚存,种群却小;有的物种没落,濒临灭绝;有的物种消亡,永被淘汰。对此,用化学动力学方程求解,便知其然,也可进一步增强人们保护生态环境的意识。     

物种概念的分析与分类学思考

本文在查阅大量文献资料的基础上,结合作者近几年所从事的科研工作,辩证分析了物种进化单元和分类单元的含义,就物种的概念进行了静止与变化、连续与间断正反两方面的哲学思考.变中有不变是物种存在的根据,间断性发展是区分种类的根据,连续性渊源是归合种类的根据,分类就是分与合的对立统一,分中有合,合中有分,它的理论根据就是生命历史的连续性与间断性的对立统一.     

稻田蜘蛛群落物种丰富度动态分析

长沙市东方红农场东塘分场共有稻田蜘蛛11科29属43种,其优势科为狼蛛科、皿蛛科、球蛛科和肖蛸科;优势种为拟水狼蛛、食虫沟瘤蛛、八斑鞘腹蛛和锥腹肖蛸.在水稻发育各期,综合防治田蜘蛛群落的丰富度(S)和个体总数(n)均大于化学防治田,晚稻田蜘蛛群落的丰富度(S)均大于相应防治的早稻田,同时发现稻田蜘蛛群落物种丰富度高的稻田,害虫的丰富度较低,反之则高.     

贵州省云台山亚气生蓝藻植物初报

本文为贵州省舞阳河国家级风景区四大景区之一的云台山的亚气生蓝藻类的首次报道。据初步调查鉴定，共收录正气生蓝藻１８６种（含变种）。其中包括３个新种和４个新变种。