INFLUENCE OF GERMINATION DATE ON SURVIVAL AND FECUNDITY IN WILD LETTUCE LACTUCA-SERRIOLA
INFLUENCE OF GERMINATION DATE ON SURVIVAL AND FECUNDITY IN WILD LETTUCE LACTUCA-SERRIOLA
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DOI：
10.2307/3544630
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发表时间：
1981-01-01
期刊：
影响因子：
3.4
通讯作者：
PRINCE, S
中科院分区：
文献类型：
--
作者：
MARKS, M;PRINCE, S
L. serriola L.幼苗全年出现，在初冬和春末出现发芽高峰。这些高峰之后紧接着是高水平的死亡率，它们一起产生几乎恒定的植物密度。在冬季萌发的种子比在春季和夏季萌发的种子产生更多的种子，这被认为与莲座期的持续时间有关。前者繁殖力的增加部分地被它们较高的死亡率所抵消。冬季发芽的植物是主要的种子生产者;那些在春季和夏季发芽的植物可以作为保险，防止更多繁殖力的个体完全丧失。
L. serriola L. seedlings emerge throughout the year with germination peaks in early winter and late spring. These peaks are followed closely by high levels of mortality which together produce an almost constant plant density. Plants from seeds which germinate in the winter months produce more seeds than those which germinate in spring and summer and this is considered to be associated with the duration of the rosette stage. The increased fecundity of the former is partially annulled by their higher mortality. The winter-germinated plants are the main seed producers; those which germinate in spring and summer may act as insurance against complete loss of the more fecund individuals.