Oxygen consumption of a single embryo/planula in the reef-building coral Acropora intermedia
| Autor: | H. H. Yamamoto, Fumio Nakaya, Nami Okubo, K. Okaji |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Marine Ecology Progress Series. 366:305-309 |
| ISSN: | 1616-1599 0171-8630 |
| DOI: | 10.3354/meps07562 |
| Popis: | O2 consumption of a single embryo/planula at each developmental stage was monitored in the reef-building coral Acropora intermedia using an optical O2-sensing system with our original micro-chamber system (6.28 µl). The lowest rate of O2 consumption was observed in unfertilized eggs. After fertilization, O2 consumption increased and remained constant until the prawn chip blas- tula stage. However, O2 consumption began to increase again during the bowl-shaped blastula stage, which involves the formation of 2 germ layers and corresponds to the beginning of gastrulation. The rate of O2 consumption peaked during the teardrop-shaped planula stage. During this stage planulae are able to swim actively, especially in the vertical plane, so an increase in energy consumption dur- ing this stage is to be expected. O2 consumption began to decrease gradually 5 d after spawning. At this stage, the larvae frequently touched the substrate with their concave aboral end, which features numerous spirocysts required for substrate attachment. When the planulae began to settle, 7 d after spawning, the rate of O2 consumption dropped to that of unfertilized eggs, suggesting that the plan- ulae slowly use stored energy for crawling/settlement behavior and/or post-settlement growth and survivorship. |
| Databáze: | OpenAIRE |
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