Respiration of the eggs of the giant cuttlefish Sepia apama

Respiration of the eggs of the giant cuttlefish Sepia apama On the roofs of subtidal crevices, the giant cuttlefish (Sepia apama) of southern Australia lays clutches of lemon-shaped eggs which hatch after 3 to 5 mo. Diffusion of oxygen through the capsule and chorion membrane to the perivitelline fluid and embryo was modelled using the equation V˙ O2 = G O2(P O2out−P O2in), where V˙ O2 = rate of oxygen consumption, G O2 = oxygen conductance of the capsule, and P O2 values = oxygen partial pressures across the capsule. During development, V˙ O2 rose exponentially as the embryo grew, reaching 5.5 μl h−1 at hatching. Throughout development, the capsule dimensions enlarged by absorption of water into the perivitelline space, increasing G O2 by a combination of increasing surface area, and decreasing thickness of the capsule. These processes maintained P O2in high enough to allow unrestricted V˙ O2 until shortly before hatching. Diffusion limitation of respiration in hatching-stage embryos was demonstrated by (1) increased embryonic V˙ O2 when P O2out was experimentally raised, (2) greater V˙ O2 of resting individuals immediately after hatching, and (3) reduced V˙ O2 of hatchlings at experimental P O2 levels higher than P O2in before hatching. Thus, low P O2in may be the stimulus to hatch. Potential problems of diffusive gas-exchange are mitigated by the relatively low incubation temperature (12 °C), which may be a factor limiting the distribution of the species to cool, southern waters. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Marine Biology Springer Journals

Respiration of the eggs of the giant cuttlefish Sepia apama

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Abstract

On the roofs of subtidal crevices, the giant cuttlefish (Sepia apama) of southern Australia lays clutches of lemon-shaped eggs which hatch after 3 to 5 mo. Diffusion of oxygen through the capsule and chorion membrane to the perivitelline fluid and embryo was modelled using the equation V˙ O2 = G O2(P O2out−P O2in), where V˙ O2 = rate of oxygen consumption, G O2 = oxygen conductance of the capsule, and P O2 values = oxygen partial pressures across the capsule. During development, V˙ O2 rose exponentially as the embryo grew, reaching 5.5 μl h−1 at hatching. Throughout development, the capsule dimensions enlarged by absorption of water into the perivitelline space, increasing G O2 by a combination of increasing surface area, and decreasing thickness of the capsule. These processes maintained P O2in high enough to allow unrestricted V˙ O2 until shortly before hatching. Diffusion limitation of respiration in hatching-stage embryos was demonstrated by (1) increased embryonic V˙ O2 when P O2out was experimentally raised, (2) greater V˙ O2 of resting individuals immediately after hatching, and (3) reduced V˙ O2 of hatchlings at experimental P O2 levels higher than P O2in before hatching. Thus, low P O2in may be the stimulus to hatch. Potential problems of diffusive gas-exchange are mitigated by the relatively low incubation temperature (12 °C), which may be a factor limiting the distribution of the species to cool, southern waters.

Journal

Marine BiologySpringer Journals

Published: Jun 16, 2000

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