Direction de la Protection des Végétaux, B. P. 1308, Rabat, Morocco.
J Chem Ecol. 1991 Aug;17(8):1499-515. doi: 10.1007/BF00984684.
A field study of the food eaten by solitary desert locusts was carried out in a winter breeding area in Mauritania. The food eaten, determined by the plant epidermis found in fecal pellets, was compared to the plant's availability in the habitat.Schouwia purpurea, well represented in the diets, was dominant at the study site. Adults had a preference forTribulus terrester. Growth and feeding on these two plants were compared. The high water content ofS. purpurea leaves limited the dry matter eaten and slowed down growth. Glucosinolates were separated and quantified by gas chromatography. There are 132μmol/g dry matter in green leaves. In multiple choice tests, with paper disks, glucosinolate extracts were phagostimulant at a low concentration (21μmol/g dry matter) and repulsive at a higher one (214μmol/ g dry matter). Biting behavior onS. purpurea was recorded and analyzed on video. The importance ofSchouwia purpurea in desert locust habitats and its defenses is discussed.
在毛里塔尼亚的一个冬季繁殖区进行了对独居沙漠蝗所吃食物的实地研究。通过对粪便颗粒中发现的植物表皮进行确定，研究人员比较了栖息地中植物的可利用性。在饮食中表现良好的 Schouwia purpurea 是研究地点的优势物种。成虫偏爱 Tribulus terrester。对这两种植物的生长和取食进行了比较。Schouwia purpurea 叶片的高含水量限制了干物质的摄入量并减缓了生长速度。通过气相色谱法分离和定量了硫代葡萄糖苷。绿叶中的硫代葡萄糖苷含量为 132μmol/g 干物质。在带有纸盘的多项选择测试中，低浓度（21μmol/g 干物质）的硫代葡萄糖苷提取物具有取食刺激性，而高浓度（214μmol/g 干物质）的提取物则具有排斥性。在视频上记录和分析了对 Schouwia purpurea 的取食行为。讨论了 Schouwia purpurea 在沙漠蝗栖息地中的重要性及其防御机制。
