tag:blogger.com,1999:blog-8441491750914005356.post3203787960200940355..comments2023-06-16T12:27:49.821+01:00Comments on Microbes Rule the Waves - 2013: Eating whale bone requires some serious symbiote diversityUnknownnoreply@blogger.comBlogger4125tag:blogger.com,1999:blog-8441491750914005356.post-90164419754924910402013-11-20T14:04:51.910+00:002013-11-20T14:04:51.910+00:00They do not mention fertilized eggs anywhere. Afte...They do not mention fertilized eggs anywhere. After fertilization, a free-living trocophore larvae is formed in about 24 hours; these larvae then swim for 9-16 days before finally settling. These stage does not feed, so if the symbionts are acquired during this phase, then they must enter through its external body surfaces. Whilst maternal provisioning sustains them during this time, the acquirement of symbionts likely occurs after settlement, when there is bone to feed on.Anonymoushttps://www.blogger.com/profile/14950879543695501526noreply@blogger.comtag:blogger.com,1999:blog-8441491750914005356.post-602688336975481342013-11-20T14:00:34.161+00:002013-11-20T14:00:34.161+00:00Osedax life cycles have been studied and it seems ...Osedax life cycles have been studied and it seems that the gametes released into the water column contain no symbionts; after fertilization, the embryos form lecithotrophic trocophores which persist for 16-24 days before settling. So it seems they also acquire their symbionts horizontally. I guess that infection by the bacteria triggers morphological changes such as apoptosis of digestive system cells, just like in Riftia pachyptila.Anonymoushttps://www.blogger.com/profile/14950879543695501526noreply@blogger.comtag:blogger.com,1999:blog-8441491750914005356.post-43215304004797125302013-11-14T17:42:59.505+00:002013-11-14T17:42:59.505+00:00Did they look at fertilized eggs at all? It could ...Did they look at fertilized eggs at all? It could be that the symbiosis occurs very early on in development. I think i heard that they are viable for a long time, which seems pretty obvious when your floating around the ocean looking for a dead whale. Maybe during this time they acquire the microbes. Otherwise how do they grow into adults without the ability to take on nutrients?Anonymoushttps://www.blogger.com/profile/08280730274629709918noreply@blogger.comtag:blogger.com,1999:blog-8441491750914005356.post-28504797147175852262013-11-14T09:50:50.442+00:002013-11-14T09:50:50.442+00:00This is an extremely interesting post! It would be...This is an extremely interesting post! It would be very interesting to know if the symbionts are inherited of gained from the environment as in the similar worm Riftia pachyptila - maybe further studies searching for genes coding chemotaxis or heterotrophic metabolism that may indicate a free living stage would help this. I would also be interesting to know if the endosymbionts are physically compartmentalized or separate themselves within the root structure, and if there are any differences in the internal enviroment in the root structure that might account for such separation.Anonymoushttps://www.blogger.com/profile/17478529917187543315noreply@blogger.com