Applying abundance/biomass comparisons on a small mammal assemblage from Barn owl (Tyto alba) pellets (Mount Soratte, central Italy): a cautionary note
Applying abundance/biomass comparisons on a small mammal assemblage from Barn owl (Tyto alba) pellets (Mount Soratte, central Italy): a cautionary note
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对仓鸮 (Tyto alba) 颗粒（意大利中部索拉特山）的小型哺乳动物组合进行丰度/生物量比较：注意事项
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发表时间：
2012
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通讯作者：
P. Ciucci
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作者：
Simona Prete;C. Battisti;F. Marini;P. Ciucci
通过对生物量/生物量进行比较（或ABC曲线），可以获得关于可能广义上影响特定群落的（人为或自然）干扰程度的信息。为了验证ABC曲线的一般有效性，我们将这些比较应用到一个小型哺乳动物数据集，该数据集由收集在意大利中部自然保护区（Monte Soratte）的仓鸮（草鸮）颗粒样本获得。从43个颗粒中，我们获得了111个个体，属于11种鼩和啮齿动物。沙氏田鼠、森林姬鼠和黄颈姬鼠是猫头鹰最常捕食的物种。绝对（和标准化）物种丰富度和香农-维纳多样性等指数始终显示出比意大利中部类似研究中获得的值更高的值，凸显了在人类化程度较低的景观中出现的这种组合的复杂结构。从ABC曲线，丰度略低于生物量，即使成对的累积频率之间的差异并不显着。这种模式表明，在我们的研究区域的小型哺乳动物群落的特点是低水平的干扰。然而，而在未受干扰的组合ABC曲线中较高的生物量表明较高的频率较大的物种在较高的营养水平，在小型哺乳动物组合，如猫头鹰颗粒所揭示的，大型物种是草食性的，synanthropic和典型的干扰栖息地。因此，我们警告说，在干扰的栖息地的增加，高体重的小型哺乳动物可能会导致ABC曲线与生物量高于丰度。因此，我们的研究结果表明，可能有相关的例外情况，到目前为止开发的ABC曲线的一般模式。
Abundance/biomass comparisons (or ABC curves) allow to obtain information on the level of (anthropogenic or natural) disturbance that may sensu lato affect specific communities. In order to verify the general validity of the ABC curves, we applied these comparisons to a small mammal dataset obtained by a sample of Barn owl (Tyto alba) pellets collected in a nature reserve of central Italy (Monte Soratte). From 43 pellets, we obtained 111 individuals belonging to 11 shrews and rodents species. Microtus savii, Apodemus sylvaticus, and Apodemus flavicollis were the species most frequently preyed upon by owls. Indices such as absolute (and normalized) species richness and Shannon–Wiener diversity consistently showed higher values than those obtained in similar studies in central Italy, highlighting the complex structure of this assemblage occurring in a landscape with low anthropization. From ABC curves, abundance was slightly lower than biomass, even though differences between paired cumulative frequencies were not significant. This pattern suggests that the small mammal community in our study area features a low level of disturbance. Nevertheless, whereas in undisturbed assemblages a higher biomass in ABC curves indicate a higher frequency of larger species at higher trophic level, in small mammal assemblages such as those revealed by owl pellets, large-sized species are herbivorous, synanthropic and typical of disturbed habitats. Accordingly, we caution that in disturbed habitats an increase of small mammals with high body mass may results in ABC curves with biomass higher than abundance. Our results therefore suggest that there might be relevant exceptions to the general patterns so far developed for ABC curves.