Abstract
Eight populations of the perennial Arabis serrata located in different habitats in Japan were chosen to investigate the extent of variation in morphological and life history traits. Under controlled environmental gradients of nutrients and light, the plants showed statistically significant heterogeneity among populations in growth and reproduction after one and two growing seasons. Seven populations produced vegetative rosettes but only plants from three populations produced inflorescences in the first year. After 2 yr, populations showed fewer differences in growth response to an increment in nutrients. Almost all populations produced seeds after 2 yr. Light suppressed sexual reproduction in all populations and affected the growth of plants in most of the populations. Analyses of the response along each gradient indicated that the populations had different degrees of sensitivity to the environmental factors studied. A significant population-environment interaction was observed. Furthermore, populations o...
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