嘉陵江吻(鱼句)生长和繁殖力研究

本文根据采自嘉陵江合川江段的483尾标本,研究吻(鱼句)的生长和繁殖力,并对其资源的增殖保护和合理利用提出初步意见。     

SO2污染对农业害虫的间接影响

用开顶式熏气罩研究了SO2污染对粘虫、黄地老虎、小菜蛾、桃蚜、萝卜蚜和豆蚜等农业害虫的影响．结果表明，适度SO2污染显著地促进了这些昆虫的生长和／或繁殖，但高浓度SO2污染对它们有明显的不良影响，这种作用是通过食料植物间接发生的．这些昆虫对适度SO2污染的反应因种类而异：3种鳞翅目昆虫表现为幼虫的平均相对生长速率（MRGR）明显加快，成虫繁殖力变化不大；3种蚜虫主要表现为成蚜的繁殖力大幅度提高．若蚜（除豆蚜外）的MRGR也显著增加．对被处理食料植物营养成分的分析表明，SO2污染诱导的蛋氨酸相对含量变化可能是它产生这些间接影响的重要原因．     

无奇不有的动物趣闻

虽然人体有许多复杂的机能，但动物也并非像看上去那么简单，它们的某些机能必须，是亲眼所见才会令人信服。     

中外老鼠奇趣大观

顽强的生命力鼠类是现存哺乳动物中数量最多、繁殖力最强的小型兽类,它具有极其顽强的生命力,能适应各种环境,几乎什么都能吃,任何地方都能住。即使从五层楼     

没有猫的国家

马尔代夫以没有猫著称于世。地处印度洋的最大的珊瑚岛国马尔代夫，这里的人们最不喜欢、最讨厌的动物就是猫，所以马尔代夫是世界上唯一的“无猫之国”。正因为如此，马尔代夫的自然生态失去了平衡，老鼠失去了“天敌”，使岛上的老鼠不仅长得肥大，而且自然繁殖力很强，多得连白天也成群结队地在大街上乱窜，横行无忌。     

野猪何时不再猖獗

野猪属国家二级保护动物,也是一种繁殖力极强的野生保护动物。在广元市旺苍县五权镇、朝天区宣河乡等地,当地村民连日来频繁遭到野猪袭击,给大家的生命财产造成严重破坏。一边是野生保护动物,一边是赖以生存的口粮,村民们该怎么办?     

Response of successive three generations of cotton bollworm, Helicoverpa armigera (Hübner), fed on cotton bolls under elevated CO2

The growth, development and consumption of successive three generations of cotton bollworm, Helicoverpa armigera （Htibner）, fed on cotton bolls grown under elevated CO2 （double-ambient vs. ambient） in open-top chambers were examined. Significant decreases in protein, total amino acid, water and nitrogen content and increases in free fatty acid were observed in cotton bolls. Changes in quality of cotton bolls affected the growth, development and food utilization of H. armigera. Significantly longer larval development duration in three successive generations and lower pupal weight of the second and third generations were observed in cotton bollworm fed on cotton bolls grown under elevated CO2. Significantly lower fecundity was also found in successive three generations of H. armigera fed on cotton bolls grown under elevated CO2. The consumption per larva occurred significant increase in successive three generations and frass per larva were also significantly increased during the second and third generations under elevated CO2. Significantly lower relative growth rate, efficiency of conversion of ingested food and significant higher relative consumption rate in successive three generations were observed in cotton bollworm fed on cotton bolls grown under elevated CO2. Significantly lower potential female fecundity, larval numbers and population consumption were found in the second and third generations of cotton bollworm fed on cotton bolls grown under elevated CO2. The integrative effect of higher larval mortality rate and lower adult fecundity resulted in significant decreases in potential population consumption in the latter two generations. The results show that elevated CO2 adversely affects cotton bolls quality, which indicates the potential population dynamics and potential population consumption of cotton bollworm will alleviate the harm to the plants in the future rising CO2 atmosphere.