Predator and pollinator? An invasive hornet alters the pollination dynamics of a native plant
Predator and pollinator? An invasive hornet alters the pollination dynamics of a native plant
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DOI：
10.1016/j.baae.2023.07.005
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发表时间：
2023-07-29
影响因子：
3.8
通讯作者：
Garrido, Josefina
中科院分区：
文献类型：
--
作者：
Rojas-Nossa, Sandra, V;O'Shea-Wheller, Thomas A.;Garrido, Josefina
入侵的泡沫虫能够扰乱本地物种的组合，改变生态动态，并降低生态系统服务。然而，通常很难量化入侵范围内的这种影响，主要是因为相互作用的复杂性，以及缺乏入侵前的相对控制。因此，在这项研究中，我们研究了入侵黄蜂对当地物种密度和主要粮食作物Hedera Hibernica授粉的影响。利用伊比利亚半岛西北部沿海地区绒毛弧菌的高度异质性分布，我们评估了不同的大黄蜂丰度对昆虫多样性、花卉访问频率和捕食者-猎物相互作用的影响。然后，我们研究了结实和结实对海柏授粉成功的综合影响。我们的结果表明，在绒毛弧菌丰度较高的地区，昆虫传粉者的访花频率和持续时间发生了显著变化。不同昆虫家族的影响差异很大，反映在绒毛弧菌对各种本地传粉者的不同捕食成功率上，同时也反映出竞争排斥。有趣的是，V.velutina本身就是花卉的常客，在花蜜丰富的地区成为最常见的花蜜采集者。尽管如此，越冬在这些地区的繁殖成功率显著下降，导致结实率下降。因此，绒毛弧菌似乎对授粉服务有多方面的影响，首先是作为昆虫捕食者，其次是作为花蜜竞争者和传粉者。至关重要的是，我们的发现表明，与被其取代的本地物种相比，绒毛委陵菜是一种劣质的传粉者，导致授粉效率的净降低，从而在Hibernica中繁殖成功。因此，这项研究揭示了入侵蜂类通过竞争性和捕食性相互作用对本地物种的深刻影响。
Invasive vespids are able to disrupt native species assemblages, modify ecological dynamics, and degrade ecosystem services. However, it is often difficult to quantify such effects within invaded ranges, principally due to the complexity of interactions, and a lack of comparative pre-invasion controls. In this study, we thus examine the effects of an invasive hornet, Vespa velutina, upon native species densities and pollination in a major food plant, Hedera hibernica. Using the highly heterogeneous distribution of V. velutina in a coastal area of the northwestern Iberian Peninsula, we assessed the impact of differing hornet abundance on insect diversity, flower visitation frequency, and predator-prey interactions. We then examined resultant effects upon the pollination success of H. hibernica, in the form of fruit and seed set. Our results demonstrated that in areas with high V. velutina abundance, the floral visitation frequencies and durations of insect pollinators were significantly altered. Effects varied widely across insect families, reflected in the differing predation success rates of V. velutina upon various native pollinators, in tandem with competitive exclusion. Interestingly, V. velutina was itself a frequent floral visitor, becoming the most common nectar forager in areas where it was abundant. In spite of this, H. hibernica reproductive success was significantly degraded in these areas, resulting in reduced seed set. As such, V. velutina appears to have multidirectional effects upon pollination services, first as an insect predator, and second as a nectar competitor and pollinator. Crucially, our findings suggest that V. velutina is an inferior pollinator when compared to the native species that it displaces, resulting in a net reduction in pollination efficacy, and hence reproductive success in H. hibernica. This study thus reveals the profound effects of an invasive vespid on native species through both competitive and predatory interactions.