tag:blogger.com,1999:blog-7583674511519808833.post7398481904565478682..comments2024-03-29T11:20:48.180+00:00Comments on Rosa Rubicondior: New Structure Evolved in Just 36 Years!Rosa Rubicondiorhttp://www.blogger.com/profile/06063268216781988588noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-7583674511519808833.post-18838369232128713022022-06-11T18:52:28.066+01:002022-06-11T18:52:28.066+01:00What a shame you didn't read that paper. It s...What a shame you didn't read that paper. It says nothing about cecal valves. Nice try at misleading people though.Rosa Rubicondiorhttps://www.blogger.com/profile/06063268216781988588noreply@blogger.comtag:blogger.com,1999:blog-7583674511519808833.post-10820250117246085942022-06-11T10:18:12.460+01:002022-06-11T10:18:12.460+01:00Tomi’s comment is supported by this paper: https:/...Tomi’s comment is supported by this paper: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5617171/Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7583674511519808833.post-78246165636491553822019-06-19T23:08:34.648+01:002019-06-19T23:08:34.648+01:00New structures are not new structures, eh?
Wow! ...New structures are not new structures, eh? <br /><br />Wow! <br /><br />Nothing better to offer Tomi?Rosa Rubicondiorhttps://www.blogger.com/profile/06063268216781988588noreply@blogger.comtag:blogger.com,1999:blog-7583674511519808833.post-9982139113600065752019-06-18T12:10:12.850+01:002019-06-18T12:10:12.850+01:00Nothing to do with 'a new structure'. Ceca...Nothing to do with 'a new structure'. Cecal valve arose due to changed diet from insects to plants. All necessary information was already present in lizard's genome and epigenetic information profiles just switched them on. Evolution didn't happen.Tomi Aaltohttps://www.blogger.com/profile/16093880807098596541noreply@blogger.comtag:blogger.com,1999:blog-7583674511519808833.post-6403831202987544862018-10-07T21:09:44.561+01:002018-10-07T21:09:44.561+01:00Strangely, you seem to have forgotten to include t...Strangely, you seem to have forgotten to include the previous sentence in your selective quote, Celeste (I note you chose to remain anonymous):<br /><br />"The relatively large fraction of leaves included into the diet of lizards in the introduced population of Pod Mrčaru has apparently also resulted in the evolution of cecal valves, a structure previously unreported for this species and rare in this family and scleroglossan lizards in general (13, 14, 18)."<br /><br />I'm sure that was just an oversite and you had no intention of <i>deliberately</i> misleading readers of this blog. That would be dishonest.Rosa Rubicondiorhttps://www.blogger.com/profile/06063268216781988588noreply@blogger.comtag:blogger.com,1999:blog-7583674511519808833.post-77649701171963776412018-10-07T04:57:04.857+01:002018-10-07T04:57:04.857+01:00Here's the citation:
Vervust, Bart, et al. &...Here's the citation: <br />Vervust, Bart, et al. "Anatomical and physiological changes associated with a recent dietary shift in the lizard Podarcis sicula." Physiological and Biochemical Zoology 83.4 (2010): 632-642.Anonymoushttps://www.blogger.com/profile/13709843684842673302noreply@blogger.comtag:blogger.com,1999:blog-7583674511519808833.post-22831999824941258322018-10-07T04:49:35.047+01:002018-10-07T04:49:35.047+01:00This is an excerpt from the paper you cited : “Al...<br /><br />This is an excerpt from the paper you cited : “Although the presence of cecal valves and large heads in hatchlings and juveniles suggests a genetic basis for these differences, further studies investigating the potential role of phenotypic plasticity and/or maternal effects in the divergence between populations are needed.” (Rapid large-scale evolutionary divergence in morphology and performance associated with exploitation of a different dietary resource., Proceedings of the National Academy of Sciences 105.12 (2008): 4792-4795.)<br />The authors are admitting that although the changes might be genetically based ( random mutation in the genes) further studies are needed to rule out phenotypic plasticity and/or maternal effects. <br />The following paper confirmed changes due to plasticity:<br /> Excerpt from abstract: “The plasticity experiment suggests that at least some of the changes associated with a dietary shift toward a higher proportion of plant material may be plastic.” <br />Excerpt from body of paper: , we also performed a preliminary analysis of the plasticity of some of these modifications. By examining individuals from Pod Mrcˇaru after they had been fed an exclusively arthropod diet, we sought to test whether the changes in gut morphology are reversible (and HENCE PLASTIC). <br />Excerpt from RESULTS section: Our results suggest that in P. sicula, at least some of the changes associated with a dietary shift toward a higher proportion of plant material may be PLASTIC. Specimens from the Pod Mrcaru population, which in nature eat substantial amounts of plant material, exhibited a reduction in diges-tive tract length and a TOTAL LOSS OF CECAL VALVES AFTER HAVING BEEN FED AN EXCLUSIVELY ARTHROPOD DIET FOR 15 WEEKS. Although parts of their gastroinstestinal systems were still better developed than those of specimens feeding mainly on arthropods in the wild, it seems likely that a prolonged exposure to an ani-mal-based diet would have erased even those differences. These observations call for a more flexible view of the digestive system in lizards. PLASTICITY of gastrointestinal morphology and function has long been de-scribed in birds and mammals In reptiles, there is evidence that digestive function may change in response to dietary demands on ontogenetic, seasonal, and instantaneous timescales. All of these observations suggest that many lineages of vertebrates, including lizards, exhibit considerable phenotypic plasticity in the mor-phology and physiology of their digestive system. In these lineages, dietary shifts from carnivory to omnivory (as observed in many lizard families; Cooper and Vitt 2002) may constitute less of an evolutionary challenge than previously thought. Now we'll see who is honest and who is not. If you're honest you will either incorporate these findings into your article or you will remove this obsolete article. You also made numerous errors and misstatements and falsehoods on the C14 dating. This blog is pure propaganda. <br />Anonymoushttps://www.blogger.com/profile/13709843684842673302noreply@blogger.comtag:blogger.com,1999:blog-7583674511519808833.post-23453298952887675122018-09-12T22:56:54.288+01:002018-09-12T22:56:54.288+01:00I had to tweet this. I remember reading it before...I had to tweet this. I remember reading it before but lost track of it. Thanks for blogging this important information. I also now follow @GrrlScientist -thanks to you! Apetivisthttps://www.blogger.com/profile/04054911590894780292noreply@blogger.com