Salt marshes are worldwide recognized for their unique and important ecological role. According to the Intergovernmental Panel on Climatic Change (IPCC), the frequency and intensity of warming events will rise due to global changes. Halophyte plants, inhabiting salt marshes are known for being highly tolerant to various abiotic stresses, nonetheless, although it has been acknowledged that the tolerance response is species specific there could also be differences at the population level. The present work aims to determine if the life history of two halophytes (Halimione portulacoides and Spartina patens), namely in terms of contaminant exposure, influences inter-populational heat tolerance. For this purpose, individuals from both species collected at pristine and contaminated sites were exposed to normal and increased temperature conditions, and its physiological fitness evaluated throughout biochemical and biophysical analysis. The photobiological traits, pigment and fatty acid profiles and oxidative stress biomarkers analyses of warming treated individuals, indicate that chronic heavy metal pre-conditioning significantly influences the heat stress tolerance of the native halophyte plants. Halimione portulacoides individuals collected at heavy metal contaminated salt marsh appeared more tolerant to heat stress. On the other hand, the invasive S. patens from the pristine site showed higher tolerance to heat stress. Thus, the pre-conditioning influences the tolerance mechanisms can affect the way in which salt marsh communities will evolve in the future, possibly being different through salt marshes. The contaminated marsh can be more resilient to invasion than the non-contaminated marsh, since the native species has benefited from this pre-conditioning. Moreover, and from the ecophysiological point the set of biophysical and biochemical indicators were tested, show a high efficiency in describing the ecophysiological traits, both between species and populations, facing different pre-conditioning histories.

盐沼以其独特而重要的生态作用而享誉​​全球。据政府间气候变化专门委员会（IPCC）称，由于全球变化，变暖事件的频率和强度将增加。众所周知，居住在盐沼中的盐生植物对各种非生物胁迫都具有高度的耐受性，尽管人们已经认识到其耐受性是特定物种的，但种群数量也可能存在差异。本工作旨在确定两种盐生植物（Halimione portulacoides和Spartina patens）的生活史。），即就污染物暴露而言，会影响种群间的耐热性。为了这个目的，将来自原始和受污染地点的两种物种的个体暴露于正常和升高的温度条件下，并通过生化和生物物理分析评估其生理适应性。升温处理的个体的光生物学特性，色素和脂肪酸谱以及氧化应激生物标记分析表明，慢性重金属预处理显着影响了天然盐生植物的热胁迫耐受性。在受重金属污染的盐沼中收集的马齿哈密酮对热胁迫的耐受性更高。另一方面，侵入性链球菌原始部位显示出较高的耐热性。因此，预处理对耐受机制的影响会影响盐沼群落未来的进化方式，可能会因盐沼而有所不同。受污染的沼泽比未受污染的沼泽对入侵的抵抗力更强，因为本地物种已从这种预处理中受益。而且，从生态生理学的角度出发，对一组生物物理和生化指标进行了测试，显示出了高效的描述物种和种群之间，面对不同预处理历史的生态生理特征的能力。