Recent ecological studies have shown a strong relation between temperature, echinoids and their g... more Recent ecological studies have shown a strong relation between temperature, echinoids and their grazing effects on macro-algal communities. In this study, we speculate that climate warming may result in an increasingly favourable environment for the reproduction and development of the sea urchin Arbacia lixula. The relationship between increased A. lixula density and the extent of barren grounds in the Mediterranean Sea is also discussed.
The International journal of developmental biology, 1996
In Paracentrotus lividus sea urchin embryos, at blastula stage, there is an abrupt increase in th... more In Paracentrotus lividus sea urchin embryos, at blastula stage, there is an abrupt increase in the abundance of alpha and beta tubulin transcripts in particular of the PI beta 1, PI beta 2 and PI alpha 2 forms. In order to assign specific functions to the various embryonic tubulin genes, we have used whole-mount in situ hybridization to determine spatial patterns of expression of five different alpha and beta tubulin embryonic genes. The PI beta 3 transcripts, as previously shown for PI alpha 2, start to localize in a few founder cells from which the neurogenic territory differentiates. The other four embryonic tubulin mRNAs (PI beta 1/2 and PI alpha 1/10), are localized in the ciliated band- and gut-territory. These territories originate by morphogenetic processes, which occur in late embryogenesis in the sea urchin and depend on cellular interactions. In particular, the interactions between the oral and aboral ectoderm specify the position of the ciliated band, whereas the invagin...
Recent ecological studies have shown a strong relation between temperature, echinoids and their g... more Recent ecological studies have shown a strong relation between temperature, echinoids and their grazing effects on macro-algal communities. In this study, we speculate that climate warming may result in an increasingly favourable environment for the reproduction and development of the sea urchin Arbacia lixula. The relationship between increased A. lixula density and the extent of barren grounds in the Mediterranean Sea is also discussed.
The International journal of developmental biology, 1996
In Paracentrotus lividus sea urchin embryos, at blastula stage, there is an abrupt increase in th... more In Paracentrotus lividus sea urchin embryos, at blastula stage, there is an abrupt increase in the abundance of alpha and beta tubulin transcripts in particular of the PI beta 1, PI beta 2 and PI alpha 2 forms. In order to assign specific functions to the various embryonic tubulin genes, we have used whole-mount in situ hybridization to determine spatial patterns of expression of five different alpha and beta tubulin embryonic genes. The PI beta 3 transcripts, as previously shown for PI alpha 2, start to localize in a few founder cells from which the neurogenic territory differentiates. The other four embryonic tubulin mRNAs (PI beta 1/2 and PI alpha 1/10), are localized in the ciliated band- and gut-territory. These territories originate by morphogenetic processes, which occur in late embryogenesis in the sea urchin and depend on cellular interactions. In particular, the interactions between the oral and aboral ectoderm specify the position of the ciliated band, whereas the invagin...
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