Effects of population density on growth, behavior and levels of biogenic amines in the cricket, Gryllus bimaculatus
Effects of population density on growth, behavior and levels of biogenic amines in the cricket, Gryllus bimaculatus
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DOI：
10.2108/zsj.12.695
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发表时间：
1995-12-01
影响因子：
0.9
通讯作者：
Urano, A
中科院分区：
文献类型：
--
作者：
Iba, M;Nagao, T;Urano, A
研究了两种不同密度饲养的双斑蟋蟀体内生物胺的数量变化与种群密度对其生长和行为的影响，这两种密度分别为完全隔离的孤立昆虫和40只拥挤的昆虫。与孤立动物相比，拥挤动物的体重增长速度较慢，表象蜕皮的时间也较晚。因此，在拥挤的群体中，发育和生长受到抑制。孤立个体的体色比拥挤个体的体色深。行为测试表明，孤立的蟋蟀比拥挤的蟋蟀具有更强的攻击性。用高效液相色谱-电化学检测法检测了隔离和拥挤蟋蟀的脑、唇体、心体和额神经节中生物胺及其前体和代谢物的水平。拥挤的蟋蟀的大脑中章鱼胺、多巴胺和5-羟色胺(5-HT)的含量明显高于孤立的蟋蟀。相反，隔离蟋蟀的N-乙酰多巴胺水平显著高于拥挤的蟋蟀。在拥挤的动物中，翼体含有明显更高的5-羟色胺水平，而心体含有更多的章鱼胺。这些结果表明，高人口密度影响胺能系统，而胺能系统反过来调节各种生物事件，如发育、生长和行为。
We examined quantitative changes in biogenic amines in relation to effects of population density on growth and behavior in the cricket Gryllus bimaculatus, which were reared in two different densities, completely isolated solitary and 40 crowded insects. In the crowded animals, the rate of increase in body weight was slow, and also the day of imaginal moult was late, when compared to the isolated ones. Development and growth were thus suppressed in the crowded group. The body color of isolated ones was darker than that of crowded ones. Behavioral tests indicated that the isolated crickets were significantly more aggressive than the crowded ones. The levels of biogenic amines, their precursors and metabolites were examined in the brain, corpora allata, corpora cardiaca and frontal ganglion of isolated and crowded crickets using high-performance liquid chromatography with electrochemical detection. The brains of crowded crickets contained significantly higher amounts of octopamine, dopamine, and 5-hydroxytryptamine (5-HT) than those in the isolated ones. On the contrary, the level of N-acetyldopamine in the isolated crickets was significantly higher than that in the crowded ones. In crowded animals the corpora allata contained significantly higher levels of 5-HT, and the corpora cardiaca contained more octopamine. These results indicate that high population density affects aminergic systems which in turn modulate various biological events, such as development, growth and behavior.