Abstract:
:Laboratory experiments indicated that the active life-span of the cercariae of Cryptocotyle lingua was temperature-dependent. An increase in water temperature and population age both correlated with a tendency for the organisms to become decaudate. The larvae were strongly photoresponsive to lateral light but with time, horizontal swimming rates (HSRs) from release point to light source progressively declined. When measured over a range of light quantities, HSRs peaked at 30 microM/m2/s. HSRs were also influenced by water temperature. A rapid increase occurred up to 15 degrees C after which there was a precipitous decline. HSRs to coloured light were negatively correlated with increasing wavelength. When offered a choice between colours, cercariae favoured the shorter wavelengths. The implications of these responses for successful transmission are discussed.
journal_name
Parasitologyjournal_title
Parasitologyauthors
Rea JG,Irwin SWdoi
10.1017/s0031182000073789subject
Has Abstractpub_date
1992-08-01 00:00:00pages
131-7eissn
0031-1820issn
1469-8161journal_volume
105 ( Pt 1)pub_type
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