Oxygen availability and embryonic development in sand snail (Polinices sordidus) egg masses

Booth, David T. (1995) Oxygen availability and embryonic development in sand snail (Polinices sordidus) egg masses. Journal of Experimental Biology, 198 1: 241-247.

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Author Booth, David T.
Title Oxygen availability and embryonic development in sand snail (Polinices sordidus) egg masses
Formatted title
Oxygen availability and embryonic development in sand snail (Polinices sordidus) egg masses
Journal name Journal of Experimental Biology   Check publisher's open access policy
ISSN 0022-0949
1477-9145
Publication date 1995-01
Sub-type Article (original research)
Open Access Status File (Publisher version)
Volume 198
Issue 1
Start page 241
End page 247
Total pages 7
Place of publication Cambridge, United Kingdom
Publisher The Company of Biologists
Language eng
Formatted abstract
The oxygen transport physiology of sand snail Polinices sordidus egg masses was investigated using oxygen microelectrodes and open-flow respirometry. P. sordidus eggs are laid in a jelly matrix that rapidly absorbs water and swells into a horseshoe-shaped sausage. The average diameter of these sausages is 37 mm. Eggs are enclosed in capsules that are distributed throughout the jelly matrix, but 65% of the eggs are located within 3 mm of the outer surface. There is no circulatory or canal system within the matrix so all gas exchange between developing embryos and the environment must occur by diffusion through the jelly matrix. Oxygen tension in the outer layer remains moderately high (PO2>10 kPa) throughout incubation but decreases rapidly in more centrally located regions, so that by day 4 embryos in this region are exposed to extremely hypoxic conditions (PO2<1 kPa). This hypoxia limits oxygen consumption of embryos to low levels and appears to slow embryonic development or even to arrest it. From day 4 onwards, the central region gradually become less hypoxic because the hatching of peripherally located embryos causes the outer layers of the jelly matrix to disintegrate and thus reduces the diffusion distance for oxygen between the centrally located embryos and the surrounding sea water. As the oxygen tension rises, development accelerates and the embryos eventually hatch as viable veligers, apparently unharmed by their prolonged exposure to hypoxia.
Keyword Embryonic development
Mollusc
Snails
Egg mass
Hypoxia
Diffusion
Polinices sordidus
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
 
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