蟹蛛,擅长伪装的昆虫捕手

记得有这样一则关于蜘蛛的谜语:"南阳诸葛亮,稳坐中军帐。布下八卦阵,专捉飞来将。"不过,并不是所有的蜘蛛都通过织网布     

揭秘食蚜蝇

当我们驻足于野花丛中,蹲下身子,细心观察,就能看见一些外表酷似蜂类的飞虫,它们就像微型的直升机,时而高速振翅悬停于空中,技艺高超而又姿态优雅;时而又以迅雷不及掩耳之势逃离你的视线,行动迅速且又高深莫测。很多人都把这些飞行高手误认为是蜂子,而今天我们就要彻底揭穿这类飞虫的真实身份。从学术上来说,我们这些飞行高手属于双翅目食蚜蝇科的昆虫,世界上已知种类达6000余种,几乎分布在地球上的各个角落。食蚜蝇与我们经常见到的苍蝇是近亲,它们的幼虫长得很像,而生活习性却大不相同。     

水面上的舞者——水黾

当我们游山玩水的时候,在池塘或小溪水面上经常可以看到一种很奇特的昆虫,它们并不会在水面上飞,也不能在水中游泳,而是能轻盈地漂在水面上快速的滑行。这种昆虫叫做水黾,不熟悉它们的人都会将它误认为是一种蚊子,因为它们都有娇小的身躯和细长的腿,实际上它们和属于双翅目的蚊子的亲缘关系是很远的,而它们真正的近亲却是我们常见的“臭大姐”椿象,它们都是半翅目的昆虫。     

Nickel accumulation and its effects on the survival rate of Spodoptera litura Fabricius under continuous nickel stress

The artificial diets mixed with various concentrations of nickel were offered to the larvae of the phytophagous insect Spodoptera litura Fabricius for 3 generations. Nickel accumulations in the 6th instar larvae, pupae and newly emerged adults of the corresponding generations of S. litura were investigated by Inductively Coupled Plasma-Atomic Emission Spectrometer (ICP-AES), and the effects of nickel accumulations on the survival rate of S. litura were also evaluated by individual rearing. The results showed that nickel accumulated in the 6th instar larvae, pupae and adults of S. litura, and the accu- mulated nickel in all the tested developmental stages within a generation increased with the increase of the nickel doses in the treated diets and showed significant dose-dependent relationship with the nickel doses in the artificial diets. The results also indicated that the nickel accumulations in the 6th instar larvae, pupae, and newly emerged adults from the 3rd generation were higher than those from the 2nd generation, which were also higher than those from the 1st generation. Nickel concentrations in pupae and adults were significantly lower than those in larvae, which indicated that the excessive nickel might be excreted during metamorphosis. Furthermore, larval survival rate, pupation rate and eclosion rate of S. litura in the tested three generations all decreased with the increase of the nickel doses in the treated diets.     

昆虫性诱剂在实践上的应用

早在１８７３年就有人发现了昆虫雌雄之间的引诱现象，直到１９５９年才以家蚕雌蛾腹部的抽提物中分离和鉴定出家蚕性诱剂的化学结构，简称“蚕蛾醇”。除翅翅目外，其它如鞘翅目、直翅目、半翅目、同翅目等许多昆虫都陆续发现了雌雄之间性引诱物质，迄今已鉴定出１００多...     

昆虫替代鱼粉作为动物蛋白饲料综述

由于动物蛋白质资源短缺，人们一直努力寻求新的动物蛋白资源。昆虫作为种类繁多、数量庞大、营养丰富的蛋白资源越来越被人们所重视。     

胡蜂细“腰”之谜

胡蜂为什么拥有这么细的"腰"?这样的结构有什么样的功能,对其生活又会产生什么负面影响呢?胡蜂科昆虫统称为胡蜂,俗名黄蜂。成虫具有昆虫的标准特征,即身体可明显地分为头、胸和腹三部分:头部具有1对略呈膝状的触角、2只肾形的复眼和强有力的咀嚼式口器;