Frenemy at the gate: invasion by Pheidole megacephala facilitates a competitively subordinate plant ant in Kenya.
Frenemy at the gate: invasion by Pheidole megacephala facilitates a competitively subordinate plant ant in Kenya.
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亦敌亦友：大头假蚁的入侵为肯尼亚的植物蚁提供了竞争优势。
DOI：
10.1002/ecy.3230
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发表时间：
2020
期刊：
影响因子：
4.8
通讯作者：
J. Goheen
中科院分区：
文献类型：
--
作者：
T. Palmer;C. Riginos;Patrick D. Milligan;Brandon R. Hays;Alejandro G. Pietrek;Nelly J. Maiyo;S. Mutisya;Benard C. Gituku;S. Musila;S. Carpenter;J. Goheen
生物入侵可以导致群落的重组，了解和预测外来物种对群落结构和功能的影响是生态学的关键挑战。研究了一种入侵蚁（Pheidole megacephala）对东非热带稀树草原金合欢（Acacia drepanolobium）及其伴生金合欢蚁群落结构和功能的影响。megacephala的入侵与三种花外花蜜依赖型Crematogaster金合欢蚁的灭绝以及一种不依赖寄主植物花蜜的本地稀有金合欢蚁Tetraponera penzigi的丰富度的强烈增加有关。通过对入侵动态的长期监测、观察和实验相结合，我们证明了大头假蝇通过降低其竞争对手（Crematogaster spp）的丰度，限制这些竞争对手的招募，并产生了一个低回报的寄主植物景观，有利于通过强烈分散的方式定居和建立。大头田鼠对寄主植物利用的季节变化可能进一步增加其群落在入侵生境中的持久性。T. penzigi-A.的持久性。入侵地区的蛭形菌共生为寄主植物提供了一些保护，使其免受大象（非洲象）的食草性侵害，大象是减少树木覆盖的关键浏览器。然而，大象对彭子芝占据的树木的伤害在入侵区高于未入侵区，这可能是由于入侵区彭子芝的种群规模减少所致。我们的研究结果揭示了这种共生破坏的潜在机制，并表明尽管在入侵地区抗金合欢共生的部分持续存在，但巨头棘入侵可能会导致树木覆盖的长期下降。
Biological invasions can lead to the reassembly of communities, and understanding and predicting the impacts of exotic species on community structure and functioning is a key challenge in ecology. We investigated the impact of a predatory species of invasive ant, Pheidole megacephala, on the structure and function of a foundational mutualism between Acacia drepanolobium and its associated acacia-ant community in an East African savanna. Invasion by P. megacephala was associated with the extirpation of three extrafloral nectar-dependent Crematogaster acacia ant species and strong increases in the abundance of a competitively subordinate and locally rare acacia ant species, Tetraponera penzigi, which does not depend on host plant nectar. Using a combination of long-term monitoring of invasion dynamics, observations and experiments, we demonstrate that P. megacephala directly and indirectly facilitates T. penzigi by reducing the abundance of T. penzigi's competitors (Crematogaster spp), imposing recruitment limitation on these competitors, and generating a landscape of low-reward host plants that favor colonization and establishment by the strongly dispersing T. penzigi. Seasonal variation in use of host plants by P. megacephala may further increase the persistence of T. penzigi colonies in invaded habitat. The persistence of the T. penzigi-A. drepanolobium symbiosis in invaded areas afforded host plants some protection against herbivory by elephants (Loxodonta africana), a key browser that reduces tree cover. However, elephant damage on T. penzigi-occupied trees was higher in invaded than in uninvaded areas, likely owing to reduced T. penzigi colony size in invaded habitats. Our results reveal the mechanisms underlying the disruption of this mutualism and suggest that P. megacephala invasion may drive long-term declines in tree cover, despite the partial persistence of the ant-acacia symbiosis in invaded areas.
阿根廷蚂蚁在岛屿生态系统中取代本土蚂蚁的直接证据
影响因子：
2.9
作者：
Naughton, I.
通讯作者：
Naughton, I.
影响因子：
16.6
作者：
Seebens H;Blackburn TM;Dyer EE;Genovesi P;Hulme PE;Jeschke JM;Pagad S;Pyšek P;Winter M;Arianoutsou M;Bacher S;Blasius B;Brundu G;Capinha C;Celesti-Grapow L;Dawson W;Dullinger S;Fuentes N;Jäger H;Kartesz J;Kenis M;Kreft H;Kühn I;Lenzner B;Liebhold A;Mosena A;Moser D;Nishino M;Pearman D;Pergl J;Rabitsch W;Rojas-Sandoval J;Roques A;Rorke S;Rossinelli S;Roy HE;Scalera R;Schindler S;Štajerová K;Tokarska-Guzik B;van Kleunen M;Walker K;Weigelt P;Yamanaka T;Essl F
通讯作者：
Essl F