Threatened fishes of the world: Silurus mento Regon, 1904 (Siluriformes: Siluridae)

Conservation status, identification, distribution, abundance, habitat and ecology, threats, conservation actions and recommendations of an endemic catfish, King's bullhead, Silurus mento were introduced.

Threatened fishes of the world: Pseudobagrus medianalis (Regan) 1904 (Bagridae)

Conservation status, identification, distribution, abundance, habitat and ecology, threats, conservation actions and recommendations of a endemic bagrid catfish, Dianchi bullhead, Pseudobagrus medianalis were introduced based on data and knowledge from a

Long-term (1956-1999) dynamics of phosphorus in a shallow, subtropical Chinese lake with the possible effects of cyanobacterial blooms

This paper describes the long-term dynamics of phosphorus concentrations in both the lake water and the sediment in a subtropical Chinese lake, Lake Donghu. The total phosphorus (TP) concentration in the lake water experienced an upward trend from the 1950s, and peaked in 1983/1984, but declined obviously afterwards. From the 1950s to the 1990s, TP content in the upper 10 cm sediment of the lake increased steadily from 0.307 to 1.68 mg Pg DW-1 at Station I and from 0.151 to 0.89 mg Pg DW-1 at Station II, respectively. The TP increase in the lake water before mid-1980s was mainly attributed to the massive input of sewage P. The outbreak of cyanobacterial blooms coincided with the peaks of TP and Orthophosphate (PO4-P) in the water in mid-1980s, and the maximum TP of the water reached as high as 1.349 mg/1 at Station I and 0.757 mg/l at Station II (in 1984), respectively. The declines of TP and PO4-P in the water after mid-1980s was coincident with the disappearance of cyanobacterial bloom. (C) 2001 Elsevier Science Ltd. All rights reserved.

真菌生命之树项目(AssemblingtheFungalTreeofLife)和美国真菌系统学研究现状

<正>美国的现代真菌系统学研究始于上世纪九十年代初期,以一系列分子系统学文章的发表为标志,其中代表性的工作有Vilgalys&Gonzalez(1990),White et al.(1990),Bruns et al.(1992),

1736～1999年西安与汉中地区年冬季平均气温序列重建

基于现代气象资料所建立的西安、汉中地区冬季降雪天数与年冬季平均气温之间的相关关系,根据清代档案所记载的西安与汉中地区冬季降雪日数,恢复了西安与汉中地区1736～1910年的年冬季平均气温,重建了1736～1999年西安与汉中地区年冬季平均气温序列。序列分析表明,这两个地区年冬季平均气温变化趋势一致:18世纪和20世纪为暖期,19世纪为冷期,且20世纪的增暖趋势明显。与利用树轮重建的镇安初春(3～4月)温度序列对比分析表明:西安、汉中地区冬季平均气温与镇安初春温度的低频变化趋势基本一致,但镇安较西安与汉中有

GIS环境下1999～2000年中国东北参考作物蒸散量时空变化特征分析

为了实现农业持续发展和保护生态环境,该文应用Penman-Monteith公式和GIS的空间分析功能,通过建立区域参考作物蒸散量的空间分布模型计算了中国东北地区自20世纪90年代以来参考作物蒸散量的时空变化特征。研究发现,20世纪90年代东北地区5～9月份日平均蒸散量呈逐年增大趋势,并以每年0.04mm的速度递增;其中5、6、7、8、9各月份绝大部分地区日均蒸散量年变化呈增加的趋势,东北平原年增长超过0.05mm,≥0.4mm蒸散地区年平均增长面积为248.73万hm2。5月份和8月份大部分地区日均蒸散量呈减少的趋势,6、7、9月份大部分地区日均蒸散量呈增加的趋势。5月和8月蒸散量的减少以及6月到9月蒸散量的增加都由东北(三江平原)向西南(辽河平原)迁移,并在空间范围上表现出一定的收缩趋势。日均蒸散量≥0.4mm蒸散地区的重心呈有规律的波动,5～9月份平均重心年际波动主要位于呼伦贝尔高原和西辽河平原两个地区,5、6、7、8、9月份重心的波动轨迹基本为由西北—东北—西南地区,空间上也逐渐由较集中变为较分散。

Analysis of structural relaxation in a Li(2)O2SiO(2) glass using rate heating approach

The structural relaxation process of an inorganic glass (Li(2)O2SiO(2)) at different cooling rates has been studied by differential scanning calorimetry. A four-parameter model-Tool-Narayanaswamy-Moynihan (TNM) model was applied to simulate the normalized specific heat curve measured. Four parameters, Delta h*/R, beta, In A, and x were obtained and compared with the values obtained from the isothermal approach. (C) 1999 Kluwer Academic Publishers.

A preliminary genetic map of Zhikong scallop (Chlamys farreri Jones et Preston 1904)

Zhikong scallop (Chlamys farreri Jones et Preston 1904) is one of the most important aquaculture species in China. The development of a genetic linkage map would provide a powerful tool for the genetic improvement of this species. Amplified fragment length polymorphism (AFLP) is a PCR-based technique that has proven to be powerful in genome fingerprinting and mapping, and population analysis. Genetic maps of C. farreri were constructed using AFLP markers and a full-sib family with 60 progeny. A total of 503 segregating AFLP markers were obtained, with 472 following the Mendelian segregation ratio of 1:1 and 31 markers showing significant (P< 0.05) segregation distortion. The male map contained 166 informative AFLP markers in 23 linkage groups covering 2468 cM. The average distance between markers was 14.9 cM. The female genetic map consisted of 198 markers in 25 linkage groups spanning 3130 cM with an average inter-marker spacing of 15.8 cM. DNA polymorphisms that segregated in a 3:1 ratio as well as the AFLP markers that were heterozygous in both parents were included to construct combined linkage genetic map. Five shared linkage groups, ranging from 61.1 to 162.5 cM, were identified between the male and female maps, covering 431 cM. Amplified fragment length polymorphism markers appeared to be evenly distributed within the linkage groups. Although preliminary, these maps provide a starting point for the mapping of the functional genes and quantitative trait loci in C. farreri.