Expression of a costly, plastic secondary sexual trait is correlated with age and condition in a damselfly with two male morphs
Expression of a costly, plastic secondary sexual trait is correlated with age and condition in a damselfly with two male morphs
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DOI：
10.1046/j.1365-3032.1999.00152.x
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发表时间：
1999-12-01
影响因子：
1.5
通讯作者：
Siva-Jothy, MT
中科院分区：
文献类型：
--
作者：
Hooper, RE;Tsubaki, Y;Siva-Jothy, MT
雄性豆娘Mnais costalis Selys（蜻蜓目：Calopalidae）在形态和行为上都是多态的，典型的存在形式是透明翅的非领土“潜行者”和橙色翅的领土“潜行者”。翅膀中的橙子色素的量，与chromophore测量，个体之间的变化，并随着生殖季节的进展而减少。在实验室中维持高或低营养饮食的年轻个体在翅膀中发育的色素量不同。高营养组的雄性比低营养组的雄性翅膀更快地发育为深色。两种性别和形态的年轻成年人喂食C-14-放射性标记的色氨酸或酪氨酸（分别是色素和黑色素的前体）。Ommochrome仅限于这两个变种的男性的pseudopterostigma，并不存在于女性。在橙子雄鸟的翅细胞中存在酪氨酸，而在透明雄鸟中没有，这表明橙子色素至少部分由黑色素构成。这些数据表明，橙子雄鸟的翅膀中必须持续保持至少一些色素水平，并且这种维持是昂贵的，因为它在低营养水平下会受到损害。
Males of the damselfly Mnais costalis Selys (Odonata: Calopterygidae) are morphologically and behaviourally polymorphic, typically existing as clear-winged non-territorial 'sneaks' and orange-winged territorial 'fighters'. The amount of orange pigment in the wing, as measured with a chromameter, varied between individuals, and decreased as the reproductive season progressed. Young individuals maintained in the laboratory on high or low nutrient diets differed in the amount of pigment that developed in the wing. Males in the high nutrient group developed darker wings faster than those in the low nutrient group. Young adults of both sexes and morphs were fed C-14-radiolabelled tryptophan or tyrosine (precursors of the pigments ommochrome and melanin, respectively). Ommochrome was restricted to the pseudopterostigma of the males of both morphs and was not present in females. The presence of tyrosine in the wing cells of orange males, but not of clear males, indicated that the orange pigment is at least partly constituted from melanin. These data show that at least some pigment levels must be maintained continuously in the wings of orange males, and that maintenance is costly as it is compromised at low nutrient levels.