The responses of Nephtys (polychaeta: Annelida) to changes in hydrostatic pressure.
نویسنده
چکیده
In recent years it has become evident that many marine invertebrates are sensitive to changes in hydrostatic pressure, and the subject has recently been reviewed by Knight-Jones & Morgan (1966). Most are planktonic forms, and their responses appear to be of a depth-regulatory nature (Baylor & Smith, 1957; Moore & Corwin, 1956). However, a few normally benthic types have also been shown to be pressure-sensitive, notably the amphipods SyncheUdium (Enright, 1962) and Corophium (Morgan, 1965) and the polychaete worm Nephtys (Qasim & Knight-Jones, 1957). The latter is habitually a burrowing form which rarely leaves the sand, but when kept in glassbottomed vessels without sand it frequently exhibits spontaneous swimming movements with the ventral side kept in contact with the bottom (Clark, 1956; Clark & Clark, i960; Mettam, 1967). When subjected to alternate minutes at atmospheric pressure, and at a pressure of 1000 mb. above atmospheric, the swimming excursions occurred more frequently during the minutes of high pressure (Knight-Jones & Morgan, 1966). Worms which were still swimming when the pressure was decreased stopped immediately following the pressure change. However, the parameters of these responses were still incompletely known, and thus a more detailed investigation seemed justified.
منابع مشابه
The Possible Role of the Supra - Oesophageal Ganglion in the Responses of Nephtys ( Polychaeta , Annelida ) to Changes in Hydrostatic Pressure
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عنوان ژورنال:
- The Journal of experimental biology
دوره 50 2 شماره
صفحات -
تاریخ انتشار 1969