An individual's status in populations of isoetid species
作者： Józef Szmeja
DOI: 10.1016/0304-3770(94)90016-7
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摘要: Abstract Individual size and fecundity of Isoetes lacustris L., Lobelia dortmanna L. Littorella uniflora (L.) Aschers., were studied in relation to the depth gradient an oligotrophic lake. The plants examined included individuals growing central part population habitat deep shallow border zones. Zone-related variation structure over has been demonstrated. is strcturally divided into shallow-water zones; wave-disturbed, as well cental zone have a rosette 87.1±37.8 cm 2 , root length 10.9±3.6 m 839±422.6 macrospores. Corresponding figures shallow, non-disturbed are 116.8±47.1 17.5±6.6 2289.3±1167. 10.6±4.1 Cm 5±1.9 1065.3±24.6 seeds. deepest 17.2±6.8 5±2.1 1213.5±245.6. A small group large fecund whose growth cycle taken place zones play significant role regeneration process: area not disturbed by waves. In every (and habitat) zone, function individual size, always greater than fecundity. There more indicated normal distribution (Gauss curve). Distributions size- fecundity-defining characters positively skewed.
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