A soil‐nesting invasive ant disrupts carbon dynamics in saplings of a foundational ant–plant
A soil‐nesting invasive ant disrupts carbon dynamics in saplings of a foundational ant–plant
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土壤筑巢的入侵蚂蚁破坏了基础蚂蚁植物幼苗中的碳动态
DOI：
10.1111/1365-2745.13803
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发表时间：
2021
影响因子：
5.5
通讯作者：
Palmer, Todd M.
中科院分区：
文献类型：
--
作者：
Milligan, Patrick D.;Martin, Timothy A.;Pringle, Elizabeth G.;Riginos, Corinna;Mizell, Gabriella M.;Palmer, Todd M.
几乎每个陆地生态系统都有入侵的蚂蚁物种，其中许多蚂蚁物种在根部附近建造地下巢穴，和/或在植物上照料以韧皮部为食的半翅目昆虫。我们对这些入侵蚂蚁行为如何改变木本植物的光合作用、碳水化合物的有效性和生长的了解有限。我们测量了光合作用、水分关系、碳水化合物浓度和生长，并对我们操纵入侵的大头金合欢和本地Ceroplastessp的温室相思树苗进行了研究。确定土壤筑巢和蚂蚁对半翅目昆虫的抚育是否以及如何影响植物碳动态。在一项实地研究中，我们还比较了入侵和非入侵稀树草原上脊椎动物排除草食动物和暴露的树苗的叶数，以检验蚂蚁入侵和脊椎动物食草与树苗光合冠大小的差异是如何关联的。尽管半翅目昆虫的侵袭通常与植物性能下降有关，但我们的屏幕温室实验没有发现半翅目昆虫的存在与植物生理差异之间的联系。然而，我们确实发现了土壤筑巢的BYP。温室大头植株的全冠光合作用降低58%，黎明前叶片水势降低31%，木质组织蔗糖浓度降低29%，叶面积减小29%。在田间，入侵稀树草原的树冠比非入侵稀树草原的树冠小29%，这与屏幕温室的结果相似。我们证明，靠近根部的土壤筑巢是大头金合欢和其他入侵蚂蚁的常见行为，可以直接减少相思树苗的碳固定和储存。这一机制不同于本地蚂蚁互惠互利BYP的破坏。巨头海豚，这会导致类似的成熟碳固定大幅下降。相思从幼树到成熟期的自然更新速率已经非常低，我们推测入侵对幼树的这些负面影响可能会抑制入侵地区的更新和种群增长。我们的结果表明，入侵蚂蚁和其他生态系统中的植物根之间的直接相互作用可能强烈地影响植物的碳固定和储存。
Nearly every terrestrial ecosystem hosts invasive ant species, and many of those ant species construct underground nests near roots and/or tend phloem‐feeding hemipterans on plants. We have a limited understanding of how these invasive ant behaviours change photosynthesis, carbohydrate availability and growth of woody plants.We measured photosynthesis, water relations, carbohydrate concentrations and growth for screenhouse‐rearedAcacia drepanolobiumsaplings on which we had manipulated invasivePheidole megacephalaants and nativeCeroplastessp. hemipterans to determine whether and how soil nesting and hemipteran tending by ants affect plant carbon dynamics. In a field study, we also compared leaf counts of vertebrate herbivore‐excluded and ‐exposed saplings in invaded and non‐invaded savannas to examine how ant invasion and vertebrate herbivory are associated with differences in sapling photosynthetic crown size.Though hemipteran infestations are often linked to declines in plant performance, our screenhouse experiment did not find an association between hemipteran presence and differences in plant physiology. However, we did find that soil nesting byP. megacephalaaround screenhouse plants was associated with >58% lower whole‐crown photosynthesis, >31% lower pre‐dawn leaf water potential, >29% lower sucrose concentrations in woody tissues and >29% smaller leaf areas. In the field, sapling crowns were 29% smaller in invaded savannas than in non‐invaded savannas, mimicking screenhouse results.Synthesis. We demonstrate that soil nesting near roots, a common behaviour byPheidole megacephalaand other invasive ants, can directly reduce carbon fixation and storage ofAcacia drepanolobiumsaplings. This mechanism is distinct from the disruption of a native ant mutualism byP. megacephala, which causes similar large declines in carbon fixation for matureA. drepanolobiumtrees.Acacia drepanolobiumalready has extremely low natural rates of recruitment from the sapling to mature stage, and we infer that these negative effects of invasion on saplings potentially curtail recruitment and reduce population growth in invaded areas. Our results suggest that direct interactions between invasive ants and plant roots in other ecosystems may strongly influence plant carbon fixation and storage.
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DOI：
--
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DOI：
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发表时间：
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影响因子：
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DOI：
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发表时间：
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影响因子：
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作者：
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