Sexual reproduction can enhance the colonization and spread of invasive plants. We aimed to evaluate ecological factors influencing sexual reproduction and dispersal capacity of exotic Spartina taxa. Density of inflorescences, spikelets per inflorescence, percentage of spikelets with caryopses, and density of caryopses were recorded for North American S. patens, South American S. densiflora, and reciprocal hybrids of invasive S. densiflora with native S. maritima in salt marshes at the Gulf of Cádiz. For S. patens and hybrids, we also assessed pollen viability, and the percentages of reabsorbed caryopses and spikelets with all stamens exserted. For fertile S. densiflora, we evaluated plant sexual traits and characteristics of the sedimentary environment, and conducted germination experiments. We found interannual variation for reproductive traits of S. densiflora which also differed among habitats. Plants with highest inflorescence and caryopsis densities occupied low marshes and saltpans, lowest caryopsis production was in low marsh where abiotic stress was high, while viability of caryopses tended to be the highest in middle and high marshes. Our results indicate neither hybrid produced any mature caryopses, due to lack of pollen viability. However, male fitness did not explain infecundity of S. patens with ca. 80% of spikelets with all stamens exserted and pollen viability was ca. 60%. To reduce invasive spread and impact, conservation efforts to protect biodiversity should prioritize rapid eradication of Spartina hybrids before they attain sexual reproductive capacity. The removal of S. densiflora within 2 years of establishment before production of viable caryopses is strongly recommended.

有性生殖可以增强入侵植物的定殖和传播。我们的目标是评估影响异域斯巴达虫分类群的有性繁殖和扩散能力的生态因素。在北美盐沼中，记录了北美S. patens，南美S. densiflora以及入侵性S. densiflora与本地S. maritima的倒数杂交的花序密度，每花序小穗的数量，带有小鳞茎的小穗的百分比以及小鳞茎的密度。加的斯湾。对于S. patens和杂种，我们还评估了花粉的生存力，以及所有雄蕊都消失后重吸收的章鱼和小穗的百分比。对于可育的S. densiflora，我们评估了植物的性状和沉积环境的特征，并进行了发芽实验。我们发现S. densiflora繁殖性状的年际变化在生境之间也有所不同。花序和颖果密度最高的植物在沼泽和盐田中的占有率低，颖果产量最低的是在非生物胁迫高的沼泽中，而颖果的活力在中，高沼泽地区往往最高。我们的结果表明，由于缺乏花粉生存力，两个杂种均未产生任何成熟的章鱼。然而，男性健身没有解释的不孕S.藓与约。雄蕊全部消失的小穗80％，花粉活力约 60％。为了减少侵入性传播和影响，为保护生物多样性而进行的保护工作应在其获得性生殖能力之前优先考虑迅速铲除Spartina杂交种。的去除S.赤松2年之内建立之前，强烈建议生产上可行的颖果的。