Department of Biological Sciences, University of Maryland, Baltimore County, Baltimore, MD.
Center for Interdisciplinary Research and Computing, University of Maryland, Baltimore County, Baltimore, MD.
J Insect Sci. 2020 Jul 1;20(4). doi: 10.1093/jisesa/ieaa062.
Cultures of Manduca sexta Johanssen in our laboratory were found to have larvae with missing or deformed mouthparts or antennae. Hypothesizing that these developmental deformities were caused by crowded rearing conditions, we reared larvae in four different population densities and recorded the incidence (% of larvae affected) and types of chemoreceptor deformities. Results showed that the incidence of these deformities was directly proportional to larval population density. Deformities of the maxilla and palp were the most frequent, followed by those of the antenna, epipharynx and maxillary styloconica. Life history traits of larval mass, food consumption, and rate of development were inversely related to larval density for both normal and deformed larvae. We discuss possible causes and mechanisms of these deformities and of changes to life history traits.
我们实验室培养的 Manduca sexta Johanssen 幼虫出现了口器或触角缺失或畸形的现象。我们推测这些发育畸形是由密集的饲养条件引起的，因此在四种不同的种群密度下饲养幼虫，并记录了化感器畸形的发生率（受影响幼虫的百分比）和类型。结果表明，这些畸形的发生率与幼虫种群密度成正比。最常见的畸形是上颌和触须的畸形，其次是触角、上咽和上颌刺的畸形。正常和畸形幼虫的幼虫质量、食物消耗和发育速度的生活史特征与幼虫密度呈反比。我们讨论了这些畸形以及生活史特征变化的可能原因和机制。
