Consequences of changing rainfall for fungal pathogen-induced mortality in tropical tree seedlings.
Consequences of changing rainfall for fungal pathogen-induced mortality in tropical tree seedlings.
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DOI：
10.1002/ece3.252
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发表时间：
2012-07
影响因子：
2.6
通讯作者：
Freckleton, Robert P.
中科院分区：
文献类型：
--
作者：
Swinfield, Tom;Lewis, Owen T.;Bagchi, Robert;Freckleton, Robert P.
大多数一般环流模型预测，由于气候变化，未来大多数热带森林将经历更少和更不频繁的降雨，这可能会降低真菌病原体驱动密度依赖性树木死亡率的能力。这一发现具有潜在的重要意义，因为真菌病原体被认为通过Janzen-Connell机制在促进和构建热带森林植物多样性方面发挥了关键作用。因此，我们假设热带森林的干燥会对物种共存产生负面影响。为了验证这一假设的一个预测，我们对热带树木plereenophora longicuspis的幼苗施加了实验性的浇水制度，并测量了真菌病原体在遮荫条件下引起的死亡率。浇水的频率对存活率有很大的影响。每天浇水的幼苗死亡率明显高于每三天或每六天浇水的幼苗，而增加浇水量也会导致死亡率增加，尽管这种关系不那么明显。这些结果表明，真菌病原体驱动密度依赖死亡率的能力在干燥气候和降雨较少时可能会降低，这可能对增强多样性的Janzen-Connell机制有潜在的影响。
Most general circulation models predict that most tropical forests will experience lower and less frequent rainfall in future as a result of climate change, which may reduce the capacity of fungal pathogens to drive density-dependent tree mortality. This is potentially significant because fungal pathogens are thought to play a key role in promoting and structuring plant diversity in tropical forests through the Janzen–Connell mechanism. Therefore, we hypothesize that the drying of tropical forests will negatively impact species coexistence. To test one prediction of this hypothesis, we imposed experimental watering regimes on the seedlings of a tropical tree, Pleradenophora longicuspis, and measured mortality induced by fungal pathogens under shade house conditions. The frequency of watering had a strong impact on survival. Seedlings watered daily experienced significantly higher mortality than those watered every three or every six days, while increasing the volume of water applied also led to increased mortality, although this relationship was less pronounced. These results suggest that the capacity of fungal pathogens to drive density-dependent mortality may be reduced in drier climates and when rainfall is less frequent, with potential implications for the diversity enhancing Janzen–Connell mechanism.
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