| Title | Molecular evidence for broad-scale distributions in bdelloid rotifers: everything is not everywhere but most things are very widespread |
| Abstract | The Baas-Becking's hypothesis, also known by the term 'everything is everywhere' (EisE), states that microscopic organisms such as bacteria and protists are globally distributed and do not show biogeographical patterns, due to their high dispersal potential. We tested the prediction of the EisE hypothesis on bdelloid rotifers, microscopic animals similar to protists in size and ecology that present one of the best cases among animals for the plausibility of global dispersal. Geographical range sizes and patterns of isolation by distance were estimated for global collections of the genera Adineta and Rotaria, using different taxonomic units: (i) traditional species based on morphology, (ii) the most inclusive monophyletic lineages from a cytochrome oxidase I phylogeny comprising just a single traditional species, and (iii) genetic clusters indicative of independently evolving lineages. Although there are cases of truly cosmopolitan distribution, even at the most finely resolved taxonomic level, most genetic clusters are distributed at continental or lower scales. Nevertheless, although 'everything is not everywhere', bdelloid rotifers do display broad distributions typical of those of other microscopic organisms. Broad dispersal and large population sizes might be factors lessening the evolutionary cost of long-term abstinence from sexual reproduction in this famous group of obligate parthenogens. |
| Source | Molecular ecology (Print) 17 (13), pp. 3136–3146 |
| Keywords | cosmopolitism'verything is everywhere' hypothesisglobal distributionmicroscopic animalsRotifera Bdelloideaspatial pattern |
| Journal | Molecular ecology (Print) |
| Editor | Blackwell Scientific Publications,, Oxford, Regno Unito |
| Year | 2008 |
| Type | Articolo in rivista |
| DOI | 10.1111/j.1365-294X.2008.03806.x |
| Authors | Fontaneto, Diego; Barraclough, Timothy G.; Chen, Kimberly; Ricci, Claudia; Herniou, Elisabeth A. |
| Text | 283700 2008 10.1111/j.1365 294X.2008.03806.x ISI Web of Science WOS 000256922000008 cosmopolitism verything is everywhere hypothesis global distribution microscopic animals Rotifera Bdelloidea spatial pattern Molecular evidence for broad scale distributions in bdelloid rotifers everything is not everywhere but most things are very widespread Fontaneto, Diego; Barraclough, Timothy G.; Chen, Kimberly; Ricci, Claudia; Herniou, Elisabeth A. Imperial College London; University of Milan; Royal Botanic Gardens, Kew The Baas Becking s hypothesis, also known by the term everything is everywhere EisE , states that microscopic organisms such as bacteria and protists are globally distributed and do not show biogeographical patterns, due to their high dispersal potential. We tested the prediction of the EisE hypothesis on bdelloid rotifers, microscopic animals similar to protists in size and ecology that present one of the best cases among animals for the plausibility of global dispersal. Geographical range sizes and patterns of isolation by distance were estimated for global collections of the genera Adineta and Rotaria, using different taxonomic units i traditional species based on morphology, ii the most inclusive monophyletic lineages from a cytochrome oxidase I phylogeny comprising just a single traditional species, and iii genetic clusters indicative of independently evolving lineages. Although there are cases of truly cosmopolitan distribution, even at the most finely resolved taxonomic level, most genetic clusters are distributed at continental or lower scales. Nevertheless, although everything is not everywhere , bdelloid rotifers do display broad distributions typical of those of other microscopic organisms. Broad dispersal and large population sizes might be factors lessening the evolutionary cost of long term abstinence from sexual reproduction in this famous group of obligate parthenogens. 17 Articolo in rivista Blackwell Scientific Publications, 0962 1083 Molecular ecology Print Molecular ecology Print Mol. ecol. Print Molecular ecology. Print diego.fontaneto FONTANETO DIEGO |
