Delayed effects of fire and logging on cicada nymph abundance
Delayed effects of fire and logging on cicada nymph abundance
复制标题
火灾和伐木对蝉若虫丰度的延迟影响
DOI：
10.1007/s10841-015-9781-6
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发表时间：
2015
影响因子：
1.9
通讯作者：
P. Pons
中科院分区：
文献类型：
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作者：
P. Pons
火灾和伐木后根系的退化导致地下生物多样性的改变。蝉的若虫以根的汁液为食，可以作为食根动物命运的指示器。我研究了一片松林中的蝉种群，2010年，一场野火烧毁了地上所有的植被，随后被砍伐。我推测，由于随之而来的食物限制，这些干扰对森林根系的影响将对若虫的丰度和长度产生负面影响。我使用了BACI(前-后控制-影响)设计方法，假设发生在空中结构死亡后大约一年的根退化是对蝉若虫的主要影响。采集了附生在植被上的蝉蜕皮作为若虫的代用品。从2011年到2012年，对照区域的蜕皮相对丰度从12.6个/100m2增加到23.3个/100m2，而在火烧区则从18.0个/100m2减少到3.6个/100m2，这可能是由于根系逐渐退化和/或由于火烧毁了卵而没有2龄若虫所致。然而，雄性和雌性蝉的蜕皮长度的年际趋势在不同地区之间没有显著差异。这一种群崩溃说明了地下动物对火灾和伐木的反应存在以前没有描述过的时间滞后，这可能会对整个生态系统产生影响。
The degradation of the root system after fire and logging entails alteration of belowground biodiversity. Nymphs of Cicada orni feed on the sap of roots and can be indicators of the fate of the root-feeding fauna. I studied the cicada population of a pine forest which was affected in 2010 by a wildfire that burned all the vegetation aboveground and was subsequently logged. I hypothesized that the effect of these disturbances on the forest root system would negatively affect nymph abundance and length, due to the consequent food limitation. I used a BACI (before-after control-impact) design approach, assuming that root degradation, taking place around 1 year after the death of aerial structures, was the main impact on cicada nymphs. Cicada exuviae attached to vegetation were collected as a proxy for nymphs. From 2011 to 2012, the relative abundance of exuviae increased from 12.6 to 23.3 exuviae/100 m2in the control area, but decreased from 18.0 to 3.6 exuviae/100 m2in the burned area, probably as a consequence of progressive root degradation and/or to the absence of 2-year-old nymphs due to the destruction of eggs by fire. However, interannual trends in exuviae length of males and females cicadas were not significantly different between areas. This population crash illustrates a previously undescribed time lag in the response of belowground animals to fire and logging which may have consequences for the ecosystem as a whole