草食性蜘蛛螨对同质和异质环境中金属积累的适应极限。

IF 2.1 3区 生物学 Q3 ECOLOGY Journal of Evolutionary Biology Pub Date : 2024-06-28 DOI:10.1093/jeb/voae003
Diogo P Godinho, Inês Fragata, Agnieszka Majer, Leonor R Rodrigues, Sara Magalhães
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引用次数: 0

摘要

一些植物利用金属积累来抵御食草动物。然而,食草动物可能会适应这些防御措施,变得不那么容易受到伤害。此外,生态系统中经常有积累金属和不积累金属的植物,但这种异质性是否会影响食草动物的适应性仍未得到充分研究。在此,我们进行了实验进化,以检验蜘蛛螨(Tetranychus evansi)在同质(含镉植物)或异质(含或不含镉植物)环境中是否适应高浓度镉的植物。为此,我们使用了番茄植物,这种植物会积累镉,从而影响这些蜘蛛螨的表现。我们测量了螨虫12代和33代后的繁殖力、孵化率和成年后代数量,以及14代和51代后的栖息地选择,结果发现性状没有变化,这意味着没有适应性。我们随后检测了这是否是由于所测性状缺乏遗传变异所致,结果发现遗传加性方差确实很小。有趣的是,尽管没有适应的迹象,但我们观察到,在有镉环境中进化的种群中,无镉植物的繁殖力和成年后代的数量都有所下降。因此,在含镉环境中进化会降低蜘蛛螨种群在无镉植物上的生长速度。可能是其他性状导致了种群在含镉植物上的持久性。这就需要针对食草动物对植物金属积累的适应性开展更多的研究。
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Limits to the adaptation of herbivorous spider mites to metal accumulation in homogeneous and heterogeneous environments.

Metal accumulation is used by some plants as a defence against herbivores. Yet, herbivores may adapt to these defences, becoming less susceptible. Moreover, ecosystems often contain plants that do and do not accumulate metals, but whether such heterogeneity affects herbivore adaptation remains understudied. Here, we performed experimental evolution to test whether the spider mite Tetranychus evansi adapts to plants with high cadmium concentrations, in homogeneous (plants with cadmium) or heterogeneous (plants with or without cadmium) environments. For that we used tomato plants, which accumulate cadmium, thus affecting the performance of these spider mites. We measured mite fecundity, hatching rate, and the number of adult offspring after 12 and 33 generations and habitat choice after 14 and 51 generations, detecting no trait change, which implies the absence of adaptation. We then tested whether this was due to a lack of genetic variation in the traits measured and, indeed, additive genetic variance was low. Interestingly, despite no signs of adaptation, we observed a decrease in fecundity and number of adult offspring produced on cadmium-free plants, in the populations evolving in environments with cadmium. Therefore, evolving in environments with cadmium reduces the growth rate of spider mite populations on non-accumulating plants. Possibly, other traits contributed to population persistence on plants with cadmium. This calls for more studies addressing herbivore adaptation to plant metal accumulation.

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来源期刊
Journal of Evolutionary Biology
Journal of Evolutionary Biology 生物-进化生物学
CiteScore
4.20
自引率
4.80%
发文量
152
审稿时长
3-6 weeks
期刊介绍: It covers both micro- and macro-evolution of all types of organisms. The aim of the Journal is to integrate perspectives across molecular and microbial evolution, behaviour, genetics, ecology, life histories, development, palaeontology, systematics and morphology.
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