Comparison of resistivity to transport by wave action in several polychaete species on an intertidal sand flat

A Tamaki
1987 Marine Ecology Progress Series  
Passive transport by waves and tidal inflow currents was examined as one of the physical factors determining the distribution of adults of 5 polychaete species -Armandia sp. (family Opheludae), S p~o filicornis (Miiller) (fam. Spionidae), Rhynchospio glutaea (Ehlers) (fam. Spionidae), Nephtys polybranchia Southern (fam. Nephtyldae), Scoloplos uschakovi Wu (fam. Orbiniidae)inhabiting an intertidal sand flat in west Kyushu, Japan. On the tidal flat, the year can be divided into 2 periods due to
more » ... asonally changing wind direction: a period of large waves from autumn to spring and a calm period during summer. A significant landward shift of the adult distribution center was observed only for the overwintering population of Armandia sp.; this could be ascribed to passive transport of individuals by large incoming waves based on the results of a trapping experiment in the field. Armandia's shallow-dwelling position below the sediment-water interface (within 1 cm), inability to adhere to large materials, and habit of curling up in a circle when disturbed by waves are considered to be the main causes of its susceptibility to large waves. Adults of Spio filicornis, R. glutaea and N. polybranchia can reach the deeper layers in the sediment (5 to 10 cm), and may hence be less affected by wave action. This also applies to S. schakovi adults, but even juveniles of this species, w h c h occur in the shallow layers of the sediment (withln 1.4 cm), were resistant to wave disturbance. One reason may be that their windinq abdomen acts as an anchor in the sediment.
doi:10.3354/meps037181 fatcat:4kfsyo3hxrevzmlyq7lzp5rhpm