Contrasting patterns of insect herbivory and predation pressure across a tropical rainfall gradient
Contrasting patterns of insect herbivory and predation pressure across a tropical rainfall gradient
复制标题
热带降雨梯度上昆虫食草和捕食压力的对比模式
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Bettina M. J. Engelbrecht
中科院分区：
文献类型：
--
作者：
Anita Weissflog;Lars Markesteijn;O. Lewis;L. Comita;Bettina M. J. Engelbrecht
热带低地森林树木多样性极高的一种解释是，它是由特殊的天敌维持的，如昆虫食草动物，这会导致依赖距离和密度的死亡。昆虫食草性也可以解释树种丰富度与降雨量之间的正相关关系，如果植食性随降雨量的增加而增加，且在局部丰富的物种上高于稀有物种，且不受湿地捕食压力的限制。为了验证这些预测，在新热带降雨量和树种丰富度梯度上量化了昆虫食草性和对昆虫食草性的捕食压力，并调查了食草性与当地树木丰富度的关系。随着降雨量的增加，昆虫在叶片上的食草性显著降低，而湿润部位的捕食压力显著增加。食草动物更有可能攻击丰富的树种，但食草动物的危害程度与树种丰富度无关。昆虫的食叶性可能有助于本地树种在我们的系统中共存，但似乎不太可能推动树种丰富度与降雨量之间的正相关。我们观察到的食草性和捕食性的出人意料和反差的模式支持了从多营养的角度充分理解促进多样性和生态系统功能的过程的必要性。
One explanation for the extraordinarily high tree diversity of tropical lowland forests is that it is maintained by specialized natural enemies such as insect herbivores, which cause distance and density dependent mortality. Insect herbivory could also explain the positive correlation between tree species richness and rainfall if herbivory increases with rainfall, is higher on locally abundant versus rare species, and is not limited by predation pressure at wet sites. To test these predictions, insect herbivory and predation pressure on insect herbivores were quantified across a Neotropical rainfall and tree species richness gradient, and herbivory was investigated in relation to local tree abundances. Insect herbivory on leaves (folivory) decreased strongly and significantly with rainfall, while predation pressure was significantly higher at the wetter site. Herbivores were more likely to attack abundant tree species, but herbivore damage levels were not related to tree species abundance. Insect folivores might contribute to local tree species coexistence in our system, but seem unlikely to drive the positive correlation between tree species richness and rainfall. The unexpected and contrasting patterns of herbivory and predation we observed support the need for a multi‐trophic perspective to understand fully the processes contributing to diversity and ecosystem functioning.
影响因子：
2.2
作者：
C. Jeffs;P. Kennedy;P. Griffith;Sofia Gripenberg;Lars Markesteijn;O. Lewis
通讯作者：
C. Jeffs;P. Kennedy;P. Griffith;Sofia Gripenberg;Lars Markesteijn;O. Lewis
DOI：
10.5351/csam.2015.22.6.665
发表时间：
2015-11
影响因子：
0.4
作者：
Kim S
通讯作者：
Kim S