| environmental constraints influencing survival of an african parasite in a north temperate habitat: effects of temperature on egg development. | summaryfactors affecting survival of parasites introduced to new geographical regions include changes in environmental temperature. protopolystoma xenopodis is a monogenean introduced with the amphibian xenopus laevis from south africa to wales (probably in the 1960s) where low water temperatures impose major constraints on life-cycle processes. effects were quantified by maintenance of eggs from infections in wales under controlled conditions at 10, 12, 15, 18, 20 and 25°c. the threshold for eg ... | 2011 | 21524323 |
| environmental constraints influencing survival of an african parasite in a north temperate habitat: effects of temperature on development within the host. | the monogenean protopolystoma xenopodis has been established in wales for >40 years following introduction with xenopus laevis from south africa. this provides an experimental system for determining constraints affecting introduced species in novel environments. parasite development post-infection was followed at 15, 20 and 25-¦c for 15 weeks and at 10-¦c for ô®¥1 year and correlated with temperatures recorded in wales. development was slowed/arrested at ô®¢10-¦c which reflects habitat condition ... | 2011 | 21733261 |
| acquired immunity protects against helminth infection in a natural host population: long-term field and laboratory evidence. | long-term records of parasite infection are rare for individuals in wild host populations. this study, on an introduced population of xenopus laevis in wales, demonstrates powerful control by acquired immunity of the monogenean, protopolystoma xenopodis. field evidence was based on a 10 year dataset for 619 individually-marked hosts screened at each capture for patent (egg-producing) infection. the adult parasite population occurred predominantly in juvenile hosts. invasion began rapidly 'post-b ... | 2012 | 22906507 |