Abstract
The population ecology of two related species of Ostracoda in the Zostera (eelgrass) beds was compared. The phytal species Loxoconchajaponica showed remarkable seasonal variation in its life history, and the population density increased explosively in early summer and suddenly decreased in late autumn. These characteristics are closely related to seasonal changes in the Zostera stock. Conversely, the bottom-dwelling species L. uranouchiensis had a population density relatively constant through the year. The main breeding season for this species was from autumn through winter. The differences in population ecology are presented as adaptations to specific habitat conditions. Some ecological features, such as the main breeding season and fecundity, are shown to be preserved in sub-fossil population structure, which will help in paleoecological reconstructions and in the understanding of fossil paleocommunities.
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