Abstract
Meiofauna were sampled from intertidal pool and vegetative hummock microhabitats at a tidal freshwater marsh on the Chickahominy River, Virginia. Nematodes, ostracods, tardigrades, oligochaetes (Naididae), copepods (Harpacticoida and Cyclopoida), and the sabellid polychaete Manayunkia spp. were numerically dominant in monthly collections. Total meiofaunal densities ranged from 169 individuals 10 cm−2 (low marsh pools, April) to 13832 individuals 10 cm−2 (low marsh hummocks, September). Highest densities of total meiofauna were observed in August–September, coincident with recruitment of oligochaetes and Manyunkia spp. to low marsh hummocks. Nematodes were generally abundant in all seasons and represented 37% of total meiofauna collected. Nematode densities were significantly greater on hummocks (p=0.0001). Ostracods were significantly more abundant in pools, Greatest densities of ostracods were observed in May. Tardigrades were abundant November through March, and September. Significantly greater abundance of tardigrades was observed on hummocks. Harpacticoid copepods were abundant from December through April and cyclopoids were abundant from May through September (low marsh only).
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