File:The Biological bulletin (19755224444).jpg

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Title: The Biological bulletin
Identifier: biologicalbullet159mari (find matches)
Year: [1] (s)
Authors: Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983
Subjects: Biology; Zoology; Biology; Marine Biology
Publisher: Woods Hole, Mass. : Marine Biological Laboratory
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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432 C. M. YOUNG AND L. F. BRAITHWAITE
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FIGURE 3. (Top.) Typical siphon inclinations of Styela montereyensis collected from the open coast (A) and protected bays (B, C). Arrows indicate incurrent siphon aperatures. FIGURE 4. (Bottom.) Current-facilitated orientation in Styela montereyensis. RESULTS Phenotypic plasticity Two major morphological characteristics, incurrent siphon curvature and rela- tive stalk length, varied among animals inhabiting different current regimes. By observing numerous animals in laboratory aquaria over periods of up to 2 months, we concluded that each consistently points its expanded incurrent siphon in a specific direction relative to its own longitudinal axis. The curvature which deter- mines this direction apparently results from differential growth in the walls of the siphon. Specimens collected from all sites on the open coast or protected outer coast, either intertidally or subtidally, characteristically had siphons curved nearly 180° from the anterior point of insertion. The aperature was thus directed posteriorly. With few exceptions, animals collected from the two protected sites displayed ventrally-directed incurrent siphons (Fig. 3), as did some animals collected from deeper than 12 m in Monterey Bay.

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