Risk spreading, habitat selection and division of biomass in a submerged clonal plant: responses to heterogeneous copper pollution.
Risk spreading, habitat selection and division of biomass in a submerged clonal plant: responses to heterogeneous copper pollution.
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DOI：
10.1016/j.envpol.2012.10.013
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发表时间：
2013-03
影响因子：
8.9
通讯作者：
Xue Yan;Haowen Wang;Qingfeng Wang;L. Rudstam
中科院分区：
文献类型：
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作者：
Xue Yan;Haowen Wang;Qingfeng Wang;L. Rudstam
污染物胁迫的异质性可能是克隆植物的重要环境因素。我们重点关注暴露于异质沉积物的沉水植物苦草无性系之间的铜转运、觅食或逃逸行为以及生物量分配。这项研究于2010年3月至9月在水生中生态系统中进行。受污染分株中积累的铜通过匍匐茎水平输出到未受污染斑块中的其他分株，然后从顶部输送到叶子，从基部输送到地下结构。没有迹象表明 V. natans 采用形态可塑性来应对异质污染的栖息地。与预测相反，更多的生物量被分配到污染斑块的地下组织。我们得出的结论是，铜胁迫的风险在水下克隆中传播，并且 V. natans 不会主动选择受污染的斑块环境中的栖息地。此外，V. natans 采用补偿性投资而不是劳动分工来获取营养和生存。
Heterogeneity of contaminant-stress can be an important environmental factor for clonal plants. We focused on Cu transport among the clones, the foraging or fugitive behavior and biomass allocation of submerged plant, Vallisneria natans (Lour.) Hara, exposed to heterogeneous sediments. This study was carried out in aquatic mesocosms between March and September 2010. Cu accumulated in contaminated ramets was exported horizontally via stolons to other ramets in uncontaminated patches, and then transported both acropetally to leaves and basipetally to belowground structures. There was no indication that V. natans adopted morphological plasticity in response to heterogeneous contaminated habitat. In contrast to predictions, more biomass was allocated to belowground tissues in contaminated patches. We concluded that risk of Cu stress spread among submerged clones, and V. natans did not actively select habitat in contaminated patchy environment. Furthermore, V. natans adopted compensatory investments instead of division of labor to acquire nutrient and survive.