The distribution of an intertidal aphid, Pemphigus trehernei foster, on marine saltmarshes.

摘要: The intertidal aphid, Pemphigus trehernei, is restricted to aster plants (Aster tripolium) growing near the edges of creeks and salt pans in low areas on tidal saltmarshes. Aphid populations mid-marsh do not show an equivalent edge effect. In low-marshes soil generally has more surface cracks cavities which can accommodate aphids a higher % air space than from regions away edges. Adults 1st instars penetrate readily non-edge soil. abundance positively correlated with low-marsh regions. established potted asters were destroyed or reduced very levels when transferred areas. It suggested that aphid distribution primarily limited by conditions, especially extent drainage.