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首页> 外文期刊>International Journal of Biodiversity and Conservation >Influence of insecticide treatment on ant diversity in tropical agroforestry system: Some aspect of the recolonization process
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Influence of insecticide treatment on ant diversity in tropical agroforestry system: Some aspect of the recolonization process

机译：农药处理对热带农林业系统蚂蚁多样性的影响：重新定殖过程的某些方面

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In order to assess the influence of insecticides treatment on ant diversity and recolonization processes in cocoa based agroforestry systems, sampling was performed using chemical knock-down technique during two consecutive cocoa campaigns (2006 and 2007) in six smallholding cocoa farms located in tree localities of the Centre Region of Cameroon. These localities are located along the South-North agroecological benchmark ranging from Ngomedzap in the humid tropical rainforest in the south through Obala in mixed degraded forest / savannah in the transitional zone to Bokito in savannah landscape. From sampled ants, community diversity was measured using Shannon index and similarities between communities calculated using the Bray Curtis distance. After one-year recolonization following insecticide treatment, species richness increased in all the study sites, from 23 to 48 species at Ngomedzap, from 39 to 46 at Obala, and from 37 to 40 at Bokito. The diversity index increased from 2.15 to 2.29 at Obala while decreasing respectively from 2.12 to 2.04 at Ngomedzap and from 2.0 to 0.89 at Bokito. After one year recolonization following treatment, a total of 35 newly establish ant species were observed. Among them 11 were arboreal and two ground-nesting species. Comparison of the community composition and population size between the two sample periods suggested that certain arboreal nesting species such as Oecophylla longinoda, Tetramorium aculeatum and some species of the genus Crematogaster may survive insecticide treatment, thanks to their nesting behaviour. Also, recolonization process may be strongly influenced by border effects.
机译：为了评估杀虫剂处理对基于可可的农林业系统中蚂蚁多样性和再定殖过程的影响，在两个连续的可可运动（2006年和2007年）期间，在位于加拿大阿肯色州树木附近的六个小规模可可农场中，使用化学击倒技术进行了采样。喀麦隆中部地区。这些地区沿南北农业生态基准分布，从南部潮湿热带雨林中的恩戈梅扎普（Ngomedzap）到过渡区混合退化森林/大草原中的奥巴拉（Obala），到大草原景观中的博基托（Bokito）。从采样的蚂蚁中，使用Shannon指数测量群落多样性，并使用Bray Curtis距离计算群落之间的相似度。在经过杀虫剂处理一年的重新定殖之后，所有研究地点的物种丰富度都增加了，在恩戈梅扎普从23种增加到48种，在Obala从39种增加到46种，在Bokito从37种增加到40种。 Obala的多样性指数从2.15增加到2.29，而Ngomedzap的多样性指数从2.12降低到2.04，Bokito的多样性指数从2.0降低到0.89。经过一年的重新定殖处理后，总共观察到35种新建立的蚂蚁物种。其中有11种为树栖植物和2种为地面嵌套的物种。通过比较两个采样期的群落组成和种群数量，发现某些树栖筑巢物种（如长叶Oecophylla longinoda，Tetramorium aculeatum和Crematogaster属某些物种）由于其筑巢行为而可以幸免杀虫剂处理。同样，重新殖民化过程可能会受到边界效应的强烈影响。

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