Landscape heterogeneity filters functional traits of rice arthropods in tropical agroecosystems

Biological control services of agroecosystems depend on the functional diversity of species traits. However, the relationship between arthropod traits and landscape heterogeneity is still poorly understood, especially in tropical rice agroecosystems which harbour a high diversity of often specialized species. We investigated how landscape heterogeneity, measured by three metrics of landscape composition and configuration, influenced body size, functional group composition, dispersal ability and vertical distribution of rice-arthropods in the Philippines.

 

We found that landscape composition and configuration acted to filter arthropod traits in tropical rice agroecosystems. Landscape diversity and rice habitat fragmentation were the two main gradients influencing rice-arthropod traits, indicating that different rice-arthropods have distinct habitat requirements. Whereas small parasitoids and species mostly present in the rice-canopy were favoured in landscapes with high compositio...

农业生态系统（agroecosystems）的生物防治服务依赖于物种功能性状多样性。然而，节肢动物（arthropod）性状与景观异质性（landscape heterogeneity）之间的关系仍不甚明晰，尤其是在物种多样性极高且多为特化物种的热带水稻农业生态系统中。我们以菲律宾的水稻节肢动物（rice-arthropod）为研究对象，通过3项景观组成与配置指标量化景观异质性，探究其对水稻节肢动物的体型大小（body size）、功能群组成（functional group composition）、扩散能力（dispersal ability）及垂直分布（vertical distribution）的影响。

研究发现，景观组成与配置对热带水稻农业生态系统中的节肢动物性状具有过滤作用。景观多样性（landscape diversity）与水稻生境破碎化是影响水稻节肢动物性状的两大主要梯度，表明不同水稻节肢动物具有截然不同的生境需求。而在高组成（原文此处文本未完整）的景观中，小型寄生蜂（parasitoids）以及主要栖息于水稻冠层（rice-canopy）的物种更受青睐。