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Vertical Distribution Correlates With Pressure Tolerances of Early Embryos in The Deep-Sea Asteroid Plutonaster Bifrons

Published online by Cambridge University Press:  11 May 2009

Craig M. Young
Affiliation:
Division of Marine Science, Harbor Branch Oceanographic Institution, 5600 US Highway 1 N, Fort Pierce, Florida 34946, USA.
Paul A. Tyler
Affiliation:
Department of Oceanography, The University, Southampton, S09 5NH.
John D. Gage
Affiliation:
Dunstaffnage Marine Research Laboratory, Scottish Association for Marine Science, PO Box 3, Oban, Argyll, PA34 4AD

Extract

The astropectinid asteroid Plutonaster bifrons (Wyville Thomson) occurs on the continental slope of the north-east Atlantic between 1000 and 2500 m depths. As in most deepsea animals, the factors limiting bathymetric distribution of this species are unknown. Eggs were fertilized in vitro and incubated through the early embryonic cleavage stages at pressures that correspond to depths from 0 to 3000 m. The highest percentage of normal development occurred near the peak of the species distribution (2000 m), and virtually no normal development occurred at a pressure corresponding to 3000 m depth. Develop-mental rate was retarded at pressures higher and lower than those found near 2000 m. These experiments indicate that embryonic pressure tolerances could determine both the upper and lower bathymetric limits of distribution for this species.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1996

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