Comparison of closely related species that differ in their life histories is a powerful method for studying the underlying physiological mechanisms contributing to life-history variation. I investigated whether two closely related members of the Camponotus festinatus species complex of desert carpenter ants, C. nr. festinatus Desert Light and C. nr. festinatus Desert Dark, differed in their life-history tactics with respect to fat storage. Newly mated queens were collected in the field, and colonies were reared under common conditions in the laboratory for 2 yr before sampling. I show that the two species differ in fat storage at the individual level. While the basic scaling relationship between lean mass and fat content did not differ between the two species, Dark workers and soldiers stored significantly more fat per unit lean mass than Light workers or soldiers. There were no significant demographic differences in the proportions of workers or soldiers involved in fat storage between the two species, although there was a trend toward Light colonies having a greater proportion of soldiers storing large amounts of fat. There was also no significant difference in the total amount of fat stored by the two species at the colony level. The detection of strong individual-level effects but no colony-level effects was likely due to the low statistical power of colony-level analyses. Showing that these two closely related species differ in fat storage at the individual level in a common environment demonstrates their utility as a model for understanding the physiological and behavioral mechanisms regulating life-history variation in fat storage in ants.

译文

:比较生活史不同的密切相关物种是研究导致生活史变异的潜在生理机制的有力方法。我调查了沙漠木匠蚂蚁C. nr的Camponotus festinatus物种复合体的两个密切相关的成员。 festinatus沙漠之光和C. nr。 festinatus Desert Dark,在脂肪储存方面的生活史策略有所不同。在田间收集新交配的皇后,在常规条件下在实验室中饲养菌落2年,然后取样。我证明了这两个物种在个体水平上的脂肪储存不同。虽然这两个物种之间瘦体重和脂肪含量之间的基本比例关系没有区别,但深色工人和士兵每单位瘦体重的脂肪存储量明显多于轻工人或士兵。在这两个物种之间,从事脂肪储存的工人或士兵的比例在人口统计学上没有显着差异,尽管有一个趋势,即轻型殖民地的士兵储存大量脂肪的比例更高。这两个物种在菌落水平上储存的脂肪总量也没有显着差异。由于菌落级分析的统计能力低,因此很可能检测到较强的个体水平效应,但没有菌落级效应。表明这两个密切相关的物种在共同环境中的个体水平上的脂肪存储量不同,这表明它们可作为模型来了解调节蚂蚁脂肪存储中生命史变化的生理和行为机制的模型。

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