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A Response Surface Investigation Of The Larval Tolerances Of Three Spionid Polychaetes To Temperature, Salinity And Food Concentration, Alan Louis Hillyard
A Response Surface Investigation Of The Larval Tolerances Of Three Spionid Polychaetes To Temperature, Salinity And Food Concentration, Alan Louis Hillyard
University of the Pacific Theses and Dissertations
Response surface techniques were used to investigate the tolerances of the planktonic larvae of three spionid polychaetes to a variety of temperature and salinity combinations. Two of the spionids were morphologically very similar members of the genus Boccar.dia., B. proboscidea and B. columbiana which occupy nearly identical geographic ranges. The other was Polydora giardi a common coinhabitant with B. columbiana. In addition a third independent parameter, food concentration, was added to the study of B. columbiana and P. giardi.
The larvae of the two Boccardia species were extremely euryhaline, in marked contrast to those of Polydora giardi which were confined …
The Ecology And Reproductive Cycle Of Pygospio Elegans Claparède (Polychaeta: Spionidae) From Tomales Bay, California, Debrah Lapp Armitage
The Ecology And Reproductive Cycle Of Pygospio Elegans Claparède (Polychaeta: Spionidae) From Tomales Bay, California, Debrah Lapp Armitage
University of the Pacific Theses and Dissertations
Pygospio elegans Claparede (1863) is a relatively small, inconspicuous intertidal Spionid polychaete (10 to 15 mm in length) having approximately 50 to 60 body segments. The species occurs in high intertidal sand flats along the central California coast.
Pygospio elegans is one of three species of the genus Pygospio, with the other being, P. california Hartman (1936) which is found only along the central California coast and P. dubia Munro (1930), from Antarctic seas. P. elegans is the most cosmopolitan of the three species (Clay, 1967; Light, 1978). The species has been recorded from both sides of the Atlantic Ocean; …
The Population Dynamics And Recruitment Pattern Of The Phoronid, Phoronopsis Viridis, Victoria Rolanda Starczak
The Population Dynamics And Recruitment Pattern Of The Phoronid, Phoronopsis Viridis, Victoria Rolanda Starczak
University of the Pacific Theses and Dissertations
A dominant organism on intertidal Pacific Coast sandflats is the lophophorate Phoronopsis viridis Hilton. This suspension feeder builds a stiff, sandy tube, 3 mm wide and up to 20 cm long and usually lying within 6 cm of the surface (Johnson 1967a). Phoronopsis viridis is found over large areas and tidal ranges of sandflats in aggregate densities of over 21,000 phoronids per m2 (Ronan 1978). On Lawson's Flat, the location of the present study, the areas of highest density of P. viridis have been known to persist for over 20 years (Steven Obrebski, personal communication).
The factors accounting for …