Faeth Stanley H
Department of Zoology, Arizona State University, 85287, Tempe, AZ, USA.
Oecologia. 1985 Dec;68(1):34-40. doi: 10.1007/BF00379470.
Patterns of herbivory over a two year period on Quercus emoryi (Fagaceae) were correlated with seasonal and yearly changes in tannin and protein content. Quantitative defense theory predicts that tannin and protein content in apparent plants should be negatively and positively correlated, respectively, with degree of herbivory. Most herbivory occurred early in the growing season, but the pattern varied between the two years. Tannin and protein content sometimes varied negatively and sometimes positively with degree of herbivory; they did not consistently covary with herbivory. Protein content was positively correlated with herbivory in 1981-1982 but not in 1982-1983. Condensed tannin content was negatively correlated with herbivory in 1981-1982 but not in 1982-1983. Hydrolysable tannin content was positively correlated with herbivory activity. Multiple regression analyses indicated these phytochemical variables explained either no significant variation in herbivory (1982-1983) or did so in a fashion opposite (1981-1982) to the predictions of the theory of quantitative defense.Feeding by oak insects was not solely a function of seasonal changes in quantitative defenses and nutrients. Obviously, population dynamics of the insects are sensitive to factors other than phytochemistry of the trees and I discuss other factors that can influence patterns of herbivory.
在两年时间里，埃默里栎（壳斗科）上的食草模式与单宁和蛋白质含量的季节性及年度变化相关。定量防御理论预测，在显见植物中，单宁和蛋白质含量应分别与食草程度呈负相关和正相关。大多数食草行为发生在生长季节早期，但两年间模式有所不同。单宁和蛋白质含量有时与食草程度呈负相关，有时呈正相关；它们与食草行为并非始终协同变化。蛋白质含量在1981 - 1982年与食草行为呈正相关，但在1982 - 1983年并非如此。缩合单宁含量在1981 - 1982年与食草行为呈负相关，但在1982 - 1983年并非如此。可水解单宁含量与食草活动呈正相关。多元回归分析表明，这些植物化学变量要么对食草行为没有显著解释力（1982 - 1983年），要么以与定量防御理论预测相反的方式解释食草行为（1981 - 1982年）。栎树昆虫的取食不仅仅是定量防御和养分季节性变化的函数。显然，昆虫的种群动态对树木植物化学之外的因素敏感，我将讨论其他可能影响食草模式的因素。
