The period between seed germination and successful seedling establishment is considered the most vulnerable phase for plant development. To better predict recruitment patterns within plant communities, it is essential to identify the abiotic constrains and biotic interactions that allow for the colonization of substrates by plant species. We evaluated which combination of factors are associated with successful survival and development of seedlings of the seagrass Posidonia oceanica in order to identify the most important microsite features acting together on recruitment success. Our results show that P. oceanica seedlings are rather specific in their environmental requirements during their first 18 months of life, when their development and survival are favored in microsites of consolidated substratum (solid rock, and to a lesser extent P. oceanica matte) covered by macroalgae (mainly crustose algae) and located in sheltered locations (with energy flux values not exceeding 7 × 10⁵ kg s⁻² m s⁻¹). After this phase, their probability of surviving becomes more independent from external conditions.

从种子发芽到幼苗成功建立之间的时期被认为是植物发育最脆弱的时期。为了更好地预测植物群落内的募集模式，必须确定允许植物物种在基质上定殖的非生物限制和生物相互作用。我们评估了哪些因素与海草Posidonia oceanica幼苗的成功存活和发育相关，以便确定最重要的微场所特征共同作用于募集成功。我们的结果表明，P。oceanica幼苗在生命的前18个月中对环境的要求相当特殊，当它们的生长和存活受到大型藻类（主要是甲壳藻类）覆盖的固结基质（坚固的岩石，以及较小程度的P. oceanica Matte）的微场所的青睐时并位于避风处（能量通量值不超过7×10 ⁵  kg s ^-2 ms ^-1）。在此阶段之后，他们生存的可能性变得更加不受外界条件的影响。