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Eucalyptus leaves are preferred to cerrado native species but do not constitute a better food resource to stream shredders
Journal of Arid Environments ( IF 2.7 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.jaridenv.2020.104221
Marcelo S. Moretti , Bárbara Becker , Walace P. Kiffer , Lyandra O. da Penha , Marcos Callisto

Abstract We investigated food preferences, growth and survival of the caddisfly shredder Phylloicus angustior while exposed to leaves of Eucalyptus camaldulensis and three native tree species (Myrcia guianensis, Miconia chartacea, and Protium brasiliense) of the Brazilian Cerrado. Because of the low quality of native leaves, we hypothesized that E. camaldulensis would be preferred and would promote higher growth and survival of shredders than Cerrado species. Except for P. brasiliense, all leaves were consumed in the food preference experiment and E. camaldulensis was preferred to native species. Shredder preferences were similar in an in situ experiment, and the consumption rates did not differ between the laboratory and field conditions. In the monodietary experiment, shredder daily growth rates were positive (4.76–6.83%) and did not differ among leaves. Survival of larvae that fed on E. camaldulensis and M. chartacea was significantly higher than those that fed on M. guianensis and P. brasiliense. Our results showed that E. camaldulensis can be an attractive food resource for P. angustior in Cerrado streams. However, the lack of differences in growth do not fully support the proposed hypothesis and suggests that E. camaldulensis does not constitute a better food resource than native leaves of worse quality.

中文翻译:

桉树叶比塞拉多本地物种更受欢迎,但不构成流式粉碎机的更好食物资源

摘要 我们调查了石蛾切碎机 Phylloicus angustior 在暴露于 Eucalyptus camaldulensis 的叶子和巴西塞拉多的三种本地树种(Myrcia guianensis、Miconia chartacea 和 Protium brasiliense)时的食物偏好、生长和存活。由于原生叶子的质量低,我们假设 E. camaldulensis 将是首选,并且会促进碎纸机比 Cerrado 物种更高的生长和存活率。除 P. brasiliense 外,所有叶子在食物偏好实验中均被消耗,E. camaldulensis 优于本地物种。原位实验中粉碎机的偏好相似,实验室和现场条件之间的消耗率没有差异。在单一饮食实验中,切碎机的日增长率为正 (4.76-6. 83%) 并且在叶子之间没有差异。以 E. camaldulensis 和 M. chartacea 为食的幼虫的存活率显着高于以 M. guianensis 和 P. brasiliense 为食的幼虫。我们的结果表明,E. camaldulensis 可以成为塞拉多溪流中 P. angustior 的有吸引力的食物资源。然而,生长差异的缺乏并不完全支持所提出的假设,并表明 E. camaldulensis 并不比质量较差的原生叶子构成更好的食物资源。
更新日期:2020-10-01
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