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Spatial Pattern and Gamete Dispersal Distances in Atrichum angustatum, a Dioicous Moss

Robert Wyatt
The Bryologist
Vol. 80, No. 2 (Summer, 1977), pp. 284-291
DOI: 10.2307/3242472
Stable URL: http://www.jstor.org/stable/3242472
Page Count: 8
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Spatial Pattern and Gamete Dispersal Distances in Atrichum angustatum, a Dioicous Moss
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Abstract

Strong segregation of sexes in populations of Atrichum angustatum (Brid.) B.S.G. is attributed to vegetative proliferation of unisexual clones. The distribution of gamete dispersal distances in this moss is highly leptokurtic, with a mean of 2.11 cm and an observed maximum of 11.0 cm. Overall shoot density is 4.6 per cm2, giving neighborhood size of about 225 individuals and neighborhood area of about .005 m2. When leafy vegetative gametophores are dissected and classified as to sex, the overall sex ratio approaches unity. These observations are compared to previous studies of sporophyte production in relation to population sex ratio and relative spatial distribution of males and females. It is concluded that sex ratio and spatial pattern to a large degree determine levels of sporophyte production in dioicous moss populations.

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