Méndez, M.Karlsson, P. S.2011-11-072011-11-071999http://hdl.handle.net/10115/5736We measured photosynthetic performance in four subarctic carnivorous plants, Pinguicula alpina, P. villosa, P. vulgaris and Drosera rotundifolia, in order to test if there is a cost of combining photosynthetic and trapping devices into the same organ (leaves). We compared these data with published results on photosynthetic rates in subarctic non-carnivorous plants. In P. vulgaris, an experiment of prey addition and removal further tested the existence of a short-term benefit of increased nutrient gain from prey in terms of photosynthetic efficiency. Leaf area-based photosynthetic rates (Pa) ranged 2.0 - 3.0 µmol CO2 m-2 s-1, dry mass-based photosynthetic rates (Pw) 42 - 69 nmol CO2 g-1 s-1, and photosynthetic nitrogen use efficiency (PNUE) 29 - 45 µmol CO2 mol N-1 s-1. In general, Pa and Pw of carnivorous plants increased with leaf nitrogen content. When each species was analysed separately, those relationships were weak (P. alpina and P. villosa) or non-significant (P. vulgaris and D. rotundifolia). The photosynthetic rate of carnivorous plants was lower than that of other subarctic growth forms. In addition, Pw for a given leaf nitrogen content was significantly lower in carnivorous plants than in non-carnivorous ones. No change in Pa, Pw or PNUE occurred as a result of prey capture manipulation, but treatments differed only slightly in nutrient content. Pw and PNUE showed a trend to be higher in reproductive P. alpina plants as compared to vegetative ones. In P. vulgaris, however, an increased leaf respiration was found in reproductive plants.engAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/carnivorous plantscost-benefitphotosynthesisnutrient-use efficiencyinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess2302.25 Fotosíntesis2415.02 Biología Molecular de Plantas