By J.H.S. Blaxter, Frederick S. Russell, Maurice Yonge (Eds.)

ISBN-10: 0120261197

ISBN-13: 9780120261192

Quantity 25 of this authoritative evaluate sequence keeps the excessive ordinary set through the editors some time past. Marine biologists in every single place have come to price and luxuriate in the big variety of thought-provoking papers written by way of invited specialists. during this quantity are experiences of 4 animal teams which span the total variety of the marine meals chain. The function of parasites in ecology is a transforming into curiosity and the parasites of zooplankton are defined intimately for the 1st time. features of thegastropods, cephalopods and fish lifestyles also are tested intimately.

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_ . (a 1 Flc. 28. Diagrams of the position of Phoronida in the substrata. , 1972). in its own burrow which is lined by a yellowish membrane that sometimes projects and is then covered with debris (Fig. 28b). The perforated hard substrata are of different kinds in Phoronis ovalis, P . hippocrepia and P . ijimai. They generally live in empty mollusc shells, sometimes in living ones, but also in barnacles, Caryophyllia, Lithothumnim, coral rubble and rocks (lime- sand- and calcarous stones), and logs (see Emig, 197313).

79) in spring 1972, but the population suffered high mortality by heavy predation (60000adults/m2 by June). In some Californian areas, Ph>oronopsisharmeri shows a uniform distribution over the littoral region of the flats, slightly less dense on the upper and lower edges of the intertidal zone where the sediment is coarser. The average annual population of P. harmeri probably remains rather constant. But, according to Ronan (1978), the population of P . harmeri shows density variations of 0-22 000 individuals/m2 along the intertidal zone.

Y, the larval form considered by Zimmer (1978) as that of Phoronis architecta (which species is a synonym of P . psammophila according to Emig, 1972a, 1977c) is thought to be related to Actinotrocha branchiata (see following paragraph). 5. Larva of Phoronis muelleri: Actinotrocha branchiata Actinotrocha branchiata was discovered near Helgoland by Muller (1846), who considered this animal to be an adult. The adult form named Phoronis was described in 1856 by Wright on the English coast. The transformation of this actinotroch into Phoronis muelleri was established by Selys-Longchamps (1903).

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Advances in Marine Biology, Vol. 19 by J.H.S. Blaxter, Frederick S. Russell, Maurice Yonge (Eds.)

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