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Competition and facilitation between germlings of Ascophyllum nodosum and Fucus vesiculosus

机译：结节曲霉和小泡菜的幼苗之间的竞争和促进

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摘要

Competitive interactions between germlings of Ascophyllum nodosum (L) Le Jolis and Fucus vesiculosus L. were studied both in the laboratory and on a shore of the Isle of Man, in the Irish Sea. Both intra- and interspecific competition were investigated by comparing the performance of algal germlings both in monocultures and mixed populations of the two species. The growth of germlings of both species reduced with increasing density. F. vesiculosus always grew faster than Ascophyllum and did best in mixed cultures, whereas Ascophyllum did least well when mixed with Fucus germlings. Clearly the adverse effects of F. vesiculosus on A. nodosum were greater than those of Ascophyllum cohorts. At the same total density, the survival and growth of Ascophyllum declined with an increasing proportion of Fucus germlings, implying that poor recruitment of A. nodosum results from strong competition with F. vesiculosus. However, under desiccation stress on the shore, F. vesiculosus enhanced the survival of A. nodosum at the early germling stage even though competition may occur again at the late stage. Thus, whether interactions between germlings take the form of competition or facilitation depends on the environmental conditions.
机译：在实验室和在爱尔兰海的马恩岛海岸上，都研究了夜蛾Acophyllum nodosum（L）Le Jolis的种和竞争性褐藻Fuscus vesiculosus L.的竞争性相互作用。通过比较藻种在单种养殖和两种混合种群中的表现，研究了种内和种间竞争。两种物种的幼苗的生长都随着密度的增加而降低。葡萄球菌的生长总是快于伞形花序，并且在混合培养中表现最好，而伞形花序与岩藻种苗混合时表现最差。显然，水曲霉对结节曲霉的不利影响要大于烟叶队列的不利影响。在相同的总密度下，Acophyllum的存活和生长随着悬钩子属种的比例增加而下降，这表明与A. vesiculosus的激烈竞争导致结节曲霉的募集不良。然而，在海岸上的干燥压力下，即使竞争可能在后期再次发生，维氏假单胞菌也能在结实初期提高结节曲霉的存活。因此，种苗之间的相互作用是以竞争还是促进的形式取决于环境条件。

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