Molecular Phylogeny of the Model Annelid Ophryotrocha
| Autor: | Kenneth M. Halanych, Bertil Åkesson, Per Sundberg, Thomas G. Dahlgren, Christoffer Schander |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Male
Annelid Base Sequence biology Sequential hermaphroditism Molecular Sequence Data Zoology Polychaeta biology.organism_classification DNA Mitochondrial DNA Ribosomal Polymerase Chain Reaction Evolution Molecular Taxon Genus Phylogenetics Sequence Homology Nucleic Acid Sexual selection Molecular phylogenetics Animals Female General Agricultural and Biological Sciences Phylogeny Gonochorism |
| Zdroj: | The Biological Bulletin. 201:193-203 |
| ISSN: | 1939-8697 0006-3185 |
| DOI: | 10.2307/1543334 |
| Popis: | Annelids of the genus Ophryotrocha are small opportunistic worms commonly found in polluted and nutrient- rich habitats such as harbors. Within this small group of about 40 described taxa a large variety of reproductive strategies are found, ranging from gonochoristic broadcast spawners to se- quential hermaphroditic brooders. Many of the species have a short generation time and are easily maintained as laboratory cultures. Thus they have become a popular system for explor- ing a variety of biological questions including developmental genetics, ethology, and sexual selection. Despite considerable behavioral, reproductive, and karyological studies, a phyloge- netic framework is lacking because most taxa are morpholog- ically similar. In this study we use 16S mitochondrial gene sequence data to infer the phylogeny of Ophryotrocha strains commonly used in the laboratory. The resulting mtDNA to- pologies are generally well resolved and support a genetic split between hermaphroditic and gonochoristic species. Although the ancestral state could not be unambiguously identified, a change in reproductive strategy (i.e., hermaphroditism and gonochorism) occurred once within Ophryotrocha. Addition- ally, we show that sequential hermaphroditism evolved from a simultaneous hermaphroditic ancestor, and that characters pre- viously used in phylogenetic reconstruction (i.e., jaw morphol- ogy and shape of egg mass) are homoplasic within the group. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|