Background and aimsCarnivorous plants are sensitive to small changes in resource availability, but few previous studies have examined how differences in nutrient and prey availability affect investment in and the benefit of carnivory. We studied the impact of site-level differences in resource availability on ecophysiological traits of carnivory for Drosera rotundifolia L.MethodsWe measured prey availability, investment in carnivory (leaf stickiness), prey capture and diet of plants growing in two bogs with differences in N deposition and plant available N: Cors Fochno (0.62 g m−2 yr.−1, 353 μg l−1), Whixall Moss (1.37 g m−2 yr.−1, 1505 μg l−1). The total N amount per plant and the contributions of prey/root N to the plants’ N budget were calculated using a single isotope natural abundance method.ResultsPlants at Whixall Moss invested less in carnivory, were less likely to capture prey, and were less reliant on prey-derived N (25.5% compared with 49.4%). Actual prey capture did not differ between sites. Diet composition differed – Cors Fochno plants captured 62% greater proportions of Diptera.ConclusionsOur results show site-level differences in plant diet and nutrition consistent with differences in resource availability. Similarity in actual prey capture may be explained by differences in leaf stickiness and prey abundance.

中文翻译：

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不同地点的环境差异控制着食肉植物圆叶茅膏菜的饮食和营养

背景和目标肉食植物对资源可用性的微小变化很敏感，但之前很少有研究探讨养分和猎物可用性的差异如何影响肉食植物的投资和效益。我们研究了资源可用性的地点差异对圆叶茅膏菜肉食性生态生理特征的影响。方法我们测量了生长在两个氮沉积差异的沼泽中的植物的猎物可用性、肉食投资（叶子粘性）、猎物捕获和饮食。和植物可用N：Cors Fochno（0.62 gm−2 yr.−1，353 μg l−1），Whixall Moss（1.37 gm−2 yr.−1，1505 μg l−1）。使用单一同位素自然丰度法计算每株植物的总氮量以及猎物/根氮对植物氮预算的贡献。结果 Whixall Moss 的植物对肉食性的投资较少，捕获猎物的可能性较小，并且依赖性较低来源于猎物的氮（25.5% 与 49.4%）。实际捕获的猎物在不同地点之间没有差异。饮食成分不同 – Cors Fochno 植物捕获的双翅目比例高出 62%。结论我们的结果显示植物饮食和营养的地点水平差异与资源可用性的差异一致。实际猎物捕获的相似性可以通过叶子粘性和猎物丰度的差异来解释。