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首页> 外文期刊>Ecological research >Photosynthetic CO_2 affinity of the aquatic carnivorous plant Utricularia australis (Lentibulariaceae) and its investment in carnivory
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Photosynthetic CO_2 affinity of the aquatic carnivorous plant Utricularia australis (Lentibulariaceae) and its investment in carnivory

机译：水生食肉植物Utricularia australis（Lentbulariaceae）的光合CO_2亲和力及其对食肉动物的投资

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摘要

Aquatic carnivorous plants usually grow in shallow dystrophic waters poor in inorganic N and P. Utricularia australis was chosen as a model plant for its prolific distribution and great ecological plasticity. The photosynthetic CO_2 compensation point and factors associated with investment in carnivory and capture of prey were measured in 17 U. australis micropopulations in Trebon basin, Czech Republic, together with water chemistry factors at these sites differing greatly in their trophic level, water hardness, and prey availability. Apical shoot growth rate was estimated at some oligotrophic sites. The micropopulations differed greatly in the proportion of traps with animal prey (2.7-70%, mean 26%), trap proportion to total biomass (1.4-42%, mean 26%), mean trap biomass (0.7-63 μg trap~(-1), mean 19 μg), and maximum trap size (1-3 mm, mean 2.0 mm). CO_2 compensation points ranged from 0.7 to 6.1 μM (mean 2.6 μM). A weak HCO_3~- use (compensation point 0.51 mM) was found in plants growing in alkaline water. Trap biomass proportion did not correlate significantly with prey capture and CO_2 compensation points with ambient [CO_2]. A very rapid apical growth (2.5-4.2 new nodes day~(-1)) occurred in sand pits. Thus, HCO_3~- use in U. australis can be induced by growing at very high pH. CO_2 compensation points resembled those known in other aquatic non-carnivorous plants. They did not reflect carnivory. In spite of very rapid apical shoot growth, the relative growth rate of U. australis can be zero in oligotrophic habitats without prey.
机译：水生食肉植物通常生长在无机氮和磷贫乏的营养不良的浅水域。由于其多产的分布和巨大的生态可塑性，其被选作典范植物。在捷克共和国Trebon盆地的17个美国南方小种群中，测量了光合作用的CO_2补偿点和与食肉动物的投资和捕获猎物有关的因素，以及这些地点的水化学因素在营养水平，水硬度和营养上有很大差异。猎物的可用性。在一些贫营养位点估计了顶梢生长速率。微小种群的差异很大，有动物猎物的陷阱比例（2.7-70％，平均26％），陷阱占总生物量的比例（1.4-42％，平均26％），平均陷阱生物量（0.7-63μg陷阱〜）。 -1），平均19μg）和最大捕集阱尺寸（1-3 mm，平均2.0 mm）。 CO_2补偿点的范围从0.7到6.1μM（平均2.6μM）。在碱性水中生长的植物中发现弱的HCO 3-使用（补偿点为0.51 mM）。捕集阱中生物量的比例与猎物捕获和CO_2与环境[CO_2]的补偿点没有显着相关。在沙坑中发生了非常快速的顶端生长（2.5-4.2个新节点天〜（-1））。因此，可以通过在非常高的pH值下生长来诱导UCO在澳大利亚U.中的使用。 CO_2补偿点类似于其他水生非食肉植物中已知的补偿点。他们没有反映肉食。尽管根尖生长非常迅速，但在没有猎物的贫营养化栖息地中，澳大利亚的相对生长速率可能为零。

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