Connection between temperature, larval production, virulence and geographical distribution of Rhipidocotyle parasites infecting the duck mussel, Anodonta anatina
In this thesis, two bucephalid trematode parasites Rhipidocotyle campanula and
R. fennica, which use the same first (Anodonta anatina) and second intermediate
(Rutilus rutilus) host were studied. The aim was to investigate the effect of
temperature on one of the key processes in the transmission of these parasites:
1) the emergence of cercarial larvae from A. anatina over short (1 h) and 2) long
(throughout the annual cercarial shedding period, from May to October) time
periods as well, as on 3) mussel survival and 4) the seasonal timing of cercarial
release. In addition, the aim was to study how the cercarial shedding traits are
linked to the 5) geographical occurrence and abundance of the Rhipidocotyle
species. In the experimental studies, the cercarial emergence by R. fennica
increased significantly with increasing temperature over short and long time
periods, while that by R. campanula was unaffected by temperature. R.
campanula clearly started seasonal cercarial release earlier and at a lower
temperature than R. fennica. Survival of mussels, especially cercariae-shedding
mussels, was lower at higher temperature, and the shedding of R. campanula
cercariae was associated with higher mussel mortality than the shedding of R.
fennica. The average duration of the seasonal cercarial release period of both
species was unaffected by temperature at the individual host level, but at the
host population level the cercarial shedding period of R. fennica (but not of R.
campanula) was longer at higher temperature. The field study showed that the
occurrence, mean prevalence and abundance of R. fennica – in accordance with
the experimentally observed association of cercarial release with high
temperature – decreased from the south (61–64 °N) to the low north (65–66 °N),
but this pattern was not detected in R. campanula.
...
Publisher
University of JyväskyläISBN
978-951-39-6422-1ISSN Search the Publication Forum
1456-9701Contains publications
- Artikkeli I: Choo J.M. & Taskinen J. 2015. Effect of short-term temperature change on cercarial release by Rhipidocotyle fennica (Trematoda, Bucephalidae) from the freshwater bivalve host, Anodonta anatina. Ecological Parasitology and Immunology 4. DOI: 10.4303/epi/235932.
- Artikkeli II: Choo J.M. & Taskinen J. 2015. Temperature-dependent transmission and virulence of two Rhipidocotyle species parasitising a molluscan host. Submitted manuscript.
- Artikkeli III: Choo J.M. & Taskinen J. 2015. Contrasting temperature responses in the seasonal timing of cercarial shedding by two Rhipidocotyle trematodes. Submitted manuscript.
- Artikkeli IV: Taskinen J., Mäkelä H.M., Kortet R. & Choo J.M. 2015. Latitudinal distribution and abundance of the trematode parasites Rhipidocotyle fennica and R. campanula. Manuscript.
Keywords
Parasites Virulence Temperature Trematoda Unionidae Anodonta Rutilus Rhipidocotyle parasites Anodonta anatina cercarial production latitudinal pattern parasitismi loiset laakamadot imumadot toukat leviäminen virulenssi isäntäeläimet henkiinjääminen simpukat järvisimpukka särkikalat särki lämpötila vesi levinneisyys
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