| polystoma gallieni: experimental evidence for chemical cues for developmental plasticity. | among monogeneans that display direct life cycles, plastic developmental strategies may have been selected to counter the lack of transmission opportunities. within amphibian polystomatids, some species of the genus polystoma develop into two different phenotypes depending on the host physiological stage to which free swimming larvae attach. when oncomiracidia infest old tadpoles, they develop slowly and migrate during host metamorphosis towards the bladder where they reach maturity. on the othe ... | 2009 | 19014939 |
| expression patterns of abd-a/lox4 in a monogenean parasite with alternative developmental paths. | a key issue in evolutionary developmental biology is to assess the roles of homeotic genes in order to uncover the origins of animal diversity. within parasitic platyhelminths which show a large diversity of developmental strategies, only one study related to the expression of hox genes has so far been conducted involving a digenean species with a complex life cycle. in the present study, we considered the expression levels of the pg-lox4 gene within polystoma gallieni of the monogenea which dis ... | 2010 | 20546802 |
| alternative parasite development in transmission strategies: how time flies! | among parasitic platyhelminths with complex life cycles, it has been well documented that transmission opportunities are the main forces shaping the diversity of life-history traits and parasite developmental strategies. while deviations in the development pathway usually involve shortening of life cycles, their extension may also occur following perception of remaining time by parasites. polystoma gallieni, the monogenean parasite of hyla meridionalis, is able to trigger two alternative develop ... | 2010 | 20796135 |
| alternative development in polystoma gallieni (platyhelminthes, monogenea) and life cycle evolution. | considering the addition of intermediate transmission steps during life cycle evolution, developmental plasticity, canalization forces and inherited parental effect must be invoked to explain new host colonization. unfortunately, there is a lack of experimental procedures and relevant models to explore the adaptive value of alternative developmental phenotypes during life cycle evolution. however, within the monogeneans that are characterized by a direct life cycle, an extension of the transmiss ... | 2013 | 23896124 |