Gill Development and Its Functional and Evolutionary Implications in the Blue Mussel Mytilus edulis (Bivalvia: Mytilidae)
| Autor: | Peter G. Beninger, Pierre Boudry, Helen McCombie, Rozenn Cannuel |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Gills
0106 biological sciences Gill media_common.quotation_subject Zoology Models Biological 010603 evolutionary biology 01 natural sciences Animals 14. Life underwater Metamorphosis media_common Larva biology Ecology 010604 marine biology & hydrobiology Pectinidae Bivalvia biology.organism_classification Mytilus Mytilidae Microscopy Electron Scanning General Agricultural and Biological Sciences Blue mussel |
| Zdroj: | The Biological Bulletin. 217:173-188 |
| ISSN: | 1939-8697 0006-3185 |
| DOI: | 10.1086/bblv217n2p173 |
| Popis: | Study of gill development in bivalve larvae and postlarvae provides information on the evolution of this organ and feeding mechanisms of early stages. Scanning electron microscopy was used to document the development of the filibranch homorhabdic gill in hatchery-reared larval, postlarval, and juvenile Mytilus edulis. Four key stages were identified during gill development: (1) transfer of the particle collection function from velum to gill at metamorphosis, with subsequent elongation of the gill filaments to form a gill basket, with complete frontal ciliation; (2) reflection of the inner demibranchs, and transition to a V-shaped gill; (3) delayed development of the outer demibranchs, occuring simultaneously along the gill axis, with transition to the adult final W-shape; and (4) formation of the ventral particle grooves and concomitant acquisition of dense abfrontal ciliation. These key stages signal shifts in the mechanisms of particle processing during the early development of M. edulis. Gill development in the homorhabdic filibranch M. edulis was similar to that of the early homorhabdic stages of the heterorhabdic filibranchs studied to date (Pectinidae), but different from that of the pseudolamellibranchs (Ostreidae), suggesting divergent evolution of this character. Similarly, the systems responsible for gill cohesion and structural integrity are common to both the homorhabdic and heterorhabdic filibranchs, suggesting evolutionary proximity, but they are patently different from those of the eulamellibranchs and pseudolamellibranchs, suggesting evolutionary divergence. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|