Grillas P, Garcia-Murillo P, Geertz-Hansen O, Marbá N, Montes C, Duarte C M, Tan Ham L, Grossmann A
Station Biologique de la Tour du Valat, F-13200, Le Sambuc, France.
Departamento de Biologia Vegetal y Ecologia, Universidad de Sevilla, Spain.
Oecologia. 1993 May;94(1):1-6. doi: 10.1007/BF00317293.
The abundance and composition of the submerged macrophyte seed bank in the Doñana marsh (southwestern Spain) was evaluated to assess its relationship with the overlying vegetation. The results obtained demonstrate the existence of a dense seed-bank, both in terms of the number of seeds and their biomass, which represented about 10% (5% for angiosperms and >20% for Charophyta) of the total plant biomass, which ensures the maintenance of the annual submerged macrophyte populations of the seasonally inundated Donñana marsh. Seed bank and established vegetation were coupled, as reflected in the existence of significant correlations between their structure and abundance. This coupling was lacking for Charophyta, whose oospores are widespread and abundant across the marsh, even at locations where they are absent, or rare, in the established vegetation. These differences between the seed bank of annual angiosperms and Charophyta appear to reflect, in part, structural differences between angiosperm seeds and Charophyta oospores, with important ecological consequences. An important aspect of these differences is the allocation of Charophyta reproductive effort to many small propagules lacking embryo storage, compared to those of angiosperms, which ensures their efficient dispersal and numerical abundance in the seed bank.
对西班牙西南部多尼亚纳沼泽中沉水植物种子库的丰度和组成进行了评估，以评估其与上层植被的关系。所获得的结果表明，无论是从种子数量还是生物量来看，都存在一个密集的种子库，其生物量约占植物总生物量的10%（被子植物为5%，轮藻为20%以上），这确保了季节性淹没的多尼亚纳沼泽中一年生沉水植物种群的维持。种子库与已建立的植被相互关联，这体现在它们的结构和丰度之间存在显著相关性。轮藻缺乏这种关联，其卵孢子在整个沼泽中广泛且丰富，即使在已建立植被中不存在或稀少的地方也是如此。一年生被子植物和轮藻种子库之间的这些差异似乎部分反映了被子植物种子和轮藻卵孢子之间的结构差异，具有重要的生态后果。这些差异的一个重要方面是，与被子植物相比，轮藻将繁殖努力分配到许多缺乏胚胎储存的小繁殖体上，这确保了它们在种子库中的有效传播和数量丰富。
