豪猪的驯养特性

阐述了豪猪形态特征 ,生活习性及驯养条件下常见疾病和防治     

Feeding habits of the darkfin hind Cephalopholis urodeta (Serranidae) at Iriomote Island, southern Japan

ABSTRACT: The feeding habits of the serranid fish Cephalopholis urodeta were examined on the basis of 204 adult specimens collected from coral reef areas at Iriomote Island, Ryukyu Islands, Japan. Sampling was conducted in November 1997 and February, May, and August 1998. Among the specimens, 95 (46.6%) had empty stomachs, the mean Stomach Fullness Index of the specimens overall being extremely low (0.6). Over a 1-year period, the most important prey of this species were small fishes and decapod crustaceans, the two categories together constituting 73.4% of stomach contents by weight. However, seasonal differences in basic dietary composition were apparent. Fishes were abundant in the diet in May and November, whereas the proportion of hermit crabs in the diet was higher in February compared to other months.     

枣瘤大球坚蚧研究

研究了枣瘤大球坚蚧各虫态的特征、生物学特性及枣瘤大球坚蚧发生危害与环境因素的关系.该虫在关中1 a发生1代,以2龄若虫固定在幼龄枝条上越冬.4月中、下旬是越冬雌虫危害盛期.4月底5月初雄虫羽化与雌虫交尾,产卵量8 000～9 000粒/只.卵期约25 d,5月底6月初孵化为若虫.6～9月若虫危害,林缘危害重于林内,迎风坡重于平地、背风坡.同一树冠内,西、南危害重于东、北方位,树冠下层危害重于中、上层;1～2 a生枝危害＞3～4 a生枝＞5～6 a生枝.蜡蚧寄生蜂和初孵若虫期(6月上旬)降雨量是影响该虫种群密度的主要因子.     

不同结荚习性抗线大豆农艺性状与产量相关研究

为了有针对性地选育抗线大豆新品种,选取16个抗线大豆品种,分成亚有限、无限结荚习性两组进行农艺性状和产量的相关分析。结果表明:无限结荚习性与亚有限结荚习性两组的产量基本持平,但无限组的株高、主茎节数、单株荚数、单株粒数、单株粒重、倒伏级别的均值均高于亚有限,而亚有限组的百粒重均值大于无限类型。无限类型大豆株高与倒伏呈极显著正相关,相关系数为0.894 4,而亚有限类型这种相关不显著。两种结荚习性的大豆单株粒重均与单株荚数呈极显著正相关,相关系数分别为0.889 3和0.706 1;在亚有限大豆中百粒重与单株粒重呈显著正相关,相关系数为0.639 3。     

稻水象甲的发生规律及防治措施

由于稻水象甲是检疫性害虫，传人我地区时间短，人们对其形态特征、生活习性、危害性、如何防治都不了解。有必要对其发生规律及防治进行总结。     

直翅目昆虫的食性分析

对直翅目 1 4个科 2 5 8种昆虫的食性从三个方面进行综合分析 :(1 )取食对象 ;(2 )取食寄主种类多寡 ;(3 )食物所属生产部门。     

海南坡鹿活动习性的研究

1985年4月至1987年9月我们在海南大田自然保护区对海南坡鹿的活动习性进行了常年的野外观察研究。发现海南坡鹿是昼夜活动的草食动物。日间活动范围不大,在无干扰的情况下。一般不超过30—40hm。春季发情交配季节经常在较开旷的生境中活动,尤其喜欢火烧迹地。秋季雄性生茸,雌性产仔期间多在林间及林缘活动,行为比较隐蔽。海南坡鹿性喜群居,平时以小群或单独个体活动,交配期群集活动频繁,经常集成较大的群。在观察时觅食与休息反刍,遇见频率占总遇见头次的97.6％。12月至翌年6月,日间多以觅食为主。每日上午与傍晚各出现一次觅食高峰期;7月至11月。日间以休息反刍为主。仅傍晚出现一次明显的觅食高峰期。     

东北新育成粳型三系杂交稻恢复系开花习性研究

以东北新育成三系粳稻恢复系为材料研究其开花习性,结果表明:7个供试恢复系有6个的始花时间在9∶00~9∶30之间,表现出较早特点;C746、C258和吉粳85号3个恢复系开花高峰较早,为11∶00左右,午前花率也高,在63.9%~77.2%之间,其它4个恢复系的开花高峰较晚,在12∶00左右,午前花率也较低,在43.4%~62.1%之间;散粉量与基因型有关,有些恢复系之间有显著差异,C135较R3多出396粒/药,变幅达32.3%。     

Feeding ecology of dominant demersal fish species <Emphasis Type="Italic">Favonigobius gymnauchen,Repomucenus</Emphasis> spp. and <Emphasis Type="Italic">Tarphops oligolepis</Emphasis> at a sandy beach where larval Japanese flounder settle in the Seto Inland Sea,Japan

ABSTRACT:   Feeding habits of Favonigobius gymnauchen , Repomucenus spp. and Tarphops oligolepis were examined during the period from May to August in 1999, 2000 and 2001 at a sandy beach in the central Seto Inland Sea, Japan. The three species of fish accounted for more than 60% of all fish collected in terms of number of individuals. All three species mainly consumed small crustaceans. However, the major prey of F .  gymnauchen and Repomucenus spp. differed from that of T .  oligolepis . F .  gymnauchen and Repomucenus spp. mainly consumed mysids and small crangonid shrimp (<12 mm in body length), which predominated in the study area. T .  oligolepis actively selected only epifaunal mysids Nipponomysis ornata and avoided crangonid shrimp and gammarids . The frequencies of occurrence of fish in the guts of the three dominant species were very low, and larval and juvenile Japanese flounder were not observed in any of the three fish species. The diet of juvenile Japanese flounder was similar to that of the three species. From these results, it appears that these three fish are competing species for the flounder.