ENVIRONMENTAL AND GENETIC DETERMINANTS OF PLANT SIZE IN VIOLA SORORIA.

Survivorship and fecundity in the forest herb, Viola sororia, are size-dependent. The basis of size variation among individuals of Viola sororia was investigated with a uniform environment experiment. Plants collected from natural populations were vegetatively reproduced and grown under two light regimes in a greenhouse.

Seasonal patterns of CO and water vapor exchange of three salt marsh succulents.

Diurnal carbon dioxide exchange patterns of three salt marsh succulents, Borrichia frutescens, Batis maritima and Salicornia virginica, were determined on a seasonal basis in the marsh at Sapelo Island, Georgia. Year-round photosynthetic activity was observed in these species though winter rates of CO exchange were reduced. Net primary productivity, estimated using gas exchange techniques, agreed with previously reported harvest data.