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.
Marine Biology – Springer Journals
Published: Jun 16, 2000
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