A COMPARISON OF THE GROWTH-CURVES OF THE FOLIOSE LICHEN PARMELIA-CONSPERSA DETERMINED BY A CROSS-SECTIONAL STUDY AND BY DIRECT MEASUREMENT

被引:12
作者
ARMSTRONG, RA
机构
[1] Vision Sciences, Aston University, Birmingham
关键词
D O I
10.1016/0098-8472(92)90005-M
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Changes in the radial growth rate (RGR, mm/yr) through life were studied in thalli of the foliose lichen Parmelia conspersa by two methods: (1) a cross-sectional study (Study A) in which the RGR was measured in 60 thalli from 0.2 to 13 cm in diameter, and (2) by radial growth measurements over 4.5 years of fragments, consisting of a single major lobe, which were removed from large thalli and glued to pieces of slate (Study B). Both studies suggested there was a phase of increasing RGR in small thalli followed by a more constant phase, the latter beginning at approximately a thallus radius of 6-8 mm. However, in Study B significantly increased RGR was observed during the second 6-month growth period. This phase of growth was more likely to be due to an increase in lobe width than to an effect of climate. In addition, a lobe in a large thallus with both adjacent lobes removed significantly increased in width over 1 year compared with control lobes. These results suggest that (1) mean lobe width in a thallus may be determined by the intensity of marginal competition between adjacent lobes, and (2) changes in lobe width during the life of a lichen thallus may be a factor determining the establishment of the linear phase of growth in foliose lichens.
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页码:221 / 227
页数:7
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