periwinkle betydelse and definition

Exempel på periwinkle

• For each of the test seawater solutions, 10 replicate trials were carried out on cercariae from 3 different periwinkles.

• Replicates were nested within periwinkles, and periwinkles nested within experimental condition.

• Means were calculated from the longevity of cercariae from 3 periwinkles (100 cercariae per periwinkle).

• Mean values represent the fastest 10 cercariae of 10 replicates carried out for 3 cercarial releases from different periwinkles.

• Some differences in swimming rate and longevity between cercariae originating from different ' clean ' periwinkles were found, but only for cercariae exposed to heavy metal solutions.

• Noticeable differences in shell shape of parasitized and uninfected periwinkles were investigated.

• The periwinkle was removed after the allotted time and the shell height measured and recorded.

• This protocol was repeated 10 times for each batch of cercariae from each periwinkle, taking less than 30 min per batch.