Residency and movement of stream-dwelling Japanese charr, Salvelinus leucomaenis, in a central Japanese mountain stream

Abstract – The residency and movement of stream-dwelling adult (2+ and older) Japanese charr, Salvelinus leucomaenis , were studied by mark and recapture experiments in the Jadani Stream, a headwater tributary of the Tedori River, central Japan, from 1986 to 1989. Of the marked fish, 31.3–58.3% were recaptured in the same pools where they had been caught during the study periods of summer (June–August), autumn (August–November) and winter–spring (November to the next June) and no seasonal movement was observed. The mean distances that the fish moved during the study periods ranged from 139.0 to 502.3 m and many movements longer than 1000 m were observed. Between the resident and the moved fish, there was little difference in body length, growth rate or sex. For the fish that had been resident in the same pools and riffles at previous recaptures, most fish were recaptures in the same locations at the next recapture. Conversely, for the fish that moved previously, most fish were recaptured in different locations from previous sites at the next recapture. These results suggest that Japanese charr exhibit relatively high residency throughout the year, but many fish moved longer distance. The results also suggest the presence of static and mobile components in the charr population.     

Genetic mapping of AFLP markers in Japanese bunching onion (<Emphasis Type="Italic">Allium fistulosum</Emphasis>)

Summary The first genetic linkage map of Japanese bunching onion (Allium fistulosum) based primarily on AFLP markers was constructed using reciprocally backcrossed progenies. They were 120 plants each of (P₁)BC₁ and (P₂)BC₁ populations derived from a cross between single plants of two inbred lines: D1s-15s-22 (P₁) and J1s-14s-20 (P₂). Based on the (P₂)BC₁ population, a linkage map of P₁ was constructed. It comprises 164 markers – 149 amplified fragment length polymorphisms (AFLPs), 2 cleaved amplified polymorphic sequences (CAPSs), and 12 simple sequence repeats (SSRs) from Japanese bunching onion, and 1 SSR from bulb onion (A. cepa) – on 15 linkage groups covering 947 centiMorgans (cM). The linkage map of P₂ was constructed with the (P₁)BC₁ population and composed of 120 loci – 105 AFLPs, 1 CAPS, and 13 SSRs developed from Japanese bunching onion and 1 SSR from bulb onion – on 14 linkage groups covering 775 cM. Both maps were not saturated but were considered to cover the majority of the genome. Nine linkage groups in P₂ map were connected with their counterparts in P₁ map using co-dominant anchor markers, 13 SSRs and 1 CAPS.     

Cloning of vacuolar H<Superscript>+</Superscript>-ATPase subunit c genes from Japanese iris,and functional characterization in yeast

Five different isoforms (IrlVHA-c1-c5) of V-ATPase subunit c (VHA-c) were cloned from a Japanese iris (Iris lactea Pall. var. chinensis Fisch. Koidz) cDNA library using degenerate primers PCR and the 5'-RACE technique. The sequence analysis showed the open reading frame (ORF) of the IrlVHA-c1 c5 to be 495 bp, corresponding to a protein of 164 amino acids. Among the five isoforms, IrlVHA-c1 and IrlVHA-c2 are completely homologous. The IrlVHA-c protein is localized at the vacuolar membrane as indicated by a g...     

长距离RT-PCR非特异性扩增的鉴定与排除

根据已经测定的乙脑病毒WHe株全基因组序列(GenBank EF107527),设计1对引物扩增基因组全长cDNA和2对特异性的鉴定引物。经RT-PCR技术扩增后,得到约9 kb的产物,经过反复实验,鉴定为外源性污染核酸扩增产物,并加以有效的排除,初步的研究表明该产物可能是由外源性污染核酸自身反向部分互补扩增所致。     

家鹑与野生日本鸣鹑进化趋异水平的初步研究

 对微山湖野生日本鸣鹑、小型家鹑与中型家鹑在不同试验分组情况下的生态行为进行观察与统计 ,结果表明 ,家鹑与野鹑在体型和生物学习性上有所不同 ;野生与家养鹌鹑的杂交需经历由排斥到亲合的过程 ;公、母鹑均有较强的择偶性 ;野生鹌鹑与家鹌鹑可以成功地实现交配 ,也可以产生受精蛋 ,受精率却不高 ;2种家鹑与野生原种在形态、生态特性方面已形成了不同程度的分化     

试论抗战胜利后国统区的农业经济全面崩溃

抗日战争胜利后到全国解放前夕,国民党统治区农业全面崩溃的根本娠因是美帝国主义的侵略和以四大家族为核心的官僚资本的残酷剥削压迫,国民党的反共内战政策加剧了农业危机。 国民党统治区农业经济全面崩溃表现为农业危机的长期性、持续性和全面性。 国民党统治区农业经济全面崩溃的特点和后果是:农业危机和工业危机、商业危机、金融危机交织一起,形成全面经济危机:经济危机和国民党的政治、军事危机互相影响,造成了国民党统治的全面危机,引起人民全面反抗。农业经济的全面崩溃对国民党统治的彻底垮台有直接影响。     

从赋能授权理论看企业领导角色的转变

随着管理环境的变化,企业管理层关注的不再是如何控制员工,而是如何激发员工的创造力和工作热情。国外企业成功的经验表明,赋能授权管理思想正在引起管理者的重视,并被越来越多的企业应用于实践,成为获得市场竞争优势的有效途径。     

江浙梅树蚧虫寄生蜂及三种中国新记录(膜翅目:小蜂总科)

从江浙梅区所采10种梅树蚧虫中育得寄生蜂4科18属25种,其中3种为中国新记录,并有10项寄主新记录,文中登录了各种寄生蜂的名称、寄主和采地,对3个中国新记录种——长角短索蚜小蜂Archenomus longicornis(Nik),蜡蚧阔柄跳小蜂Metaphycus tamakatakaigara Tachikawa和网室优盾金小蜂Eunotus arelatus(Ratzeburg)作了记述,并附特征图。     

日本南瓜果实发育与营养吸收的初步研究

研究了日本南瓜从花后到商品成熟期直至老熟期果实发育过程中鲜重、干重、长度和横径以及干鲜重比的变化。结果表明 ,日本南瓜在生长膨大期 ,果实的鲜重与长度、横径变化趋势一致 ,开花后 9d内增长迅速 ,9d后增长速率减慢 ;干重和干鲜重比的变化表明 ,花后 6d干重增加较慢 ,6d后干重迅速增加 ,直至老熟期干重仍有增加。另外 ,对果实发育过程对N ,P ,K吸收特性进行了研究 ,结果表明 ,果实发育对N ,K吸收较多 ,对P吸收较少。