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Ecological and evolutionary significance of a lack of capacity for extended developmental arrest in crocodilian eggs.

ABSTRACT: Hypoxia within the oviducts maintains embryonic arrest in turtles at the pre-ovipositional stage, which expands the timeframe over which nesting can occur without compromising embryo survival. The arrest can be extended post-oviposition through incubation of eggs in hypoxia. We determined whether crocodilian embryos have this same capacity. We also tested whether increased oxygen availability during incubation alters hatching success. We incubated freshly laid saltwater crocodile (Crocodylus porosus) eggs (N?=?83) at 32°C in one of five treatments; control (normoxia; 21% O₂), 3-day and 6-day hypoxia (1% O₂), or 3-day and 6-day hyperoxia (42% O₂). Incubation (approx. 82 days) was then completed in normoxia. There was a significant effect of treatment on survival of embryos through to hatching (p?Crocodylia.

SUBMITTER: Williamson SA

PROVIDER: S-EPMC5750033 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature

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Ecological and evolutionary significance of a lack of capacity for extended developmental arrest in crocodilian eggs.

Williamson Sean A SA Evans Roger G RG Manolis S Charlie SC Webb Grahame J GJ Reina Richard D RD

Royal Society open science 20171220 12

Hypoxia within the oviducts maintains embryonic arrest in turtles at the pre-ovipositional stage, which expands the timeframe over which nesting can occur without compromising embryo survival. The arrest can be extended post-oviposition through incubation of eggs in hypoxia. We determined whether crocodilian embryos have this same capacity. We also tested whether increased oxygen availability during incubation alters hatching success. We incubated freshly laid saltwater crocodile (<i>Crocodylus ...[more]

PMID: 29308266

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