Metrics details Abstract An intensive study of the spatial distribution ofNereis virens Canton PA sex dating andNephtys caeca Fabricius was conducted during the spring and autumn of in the lower St.
Statistical analysis Adult dating CT Washington depot 6794 that spatial variations in density, individual body weight and sexual maturity, particularly in the case ofNereis virens, are correlated with the intertidal level, with certain sediment characteristics, and with the thickness of the colonizable sediment layer. The density ofN. For both species, mean body weight increases downshore from the upper intertidal level.
Other specific relationships exist in relation to sediment characteristics. Sexually matureNereis virens are found only at the lower intertidal level; sexual maturity inNephtys caeca was not studied.
There were no changes in spatial distribution patterns between spring and autumn. The spatial distribution ofNereis virens parallels depth contours and may reflect its ability to inhabit environments which become more physically unstable in an offshore-onshore direction. This spatial distribution is consistent with a model whereby larvae are recruited in the upper intertidal zone and juveniles migrate downshore.
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