Shell colouration and parasite tolerance in two helicoid snail species.
The polymorphism of shell colouration in helicoid snails is a well-known phenomenon attributed to different factors such as predation and climatic effects. Another aspect contributing to this polymorphism could be the interplay of melanin production and phenoloxidase-related immunity. Therefore, in this study we aimed at answering the questions whether there is a differential sensitivity of different snail shell colour morphs to nematode infection, and whether this can be related to differences in phenoloxidase (PO) activity levels using the two helicoid, polymorphic snail species Cepaea hortensis and Cernuella virgata. Snails of both species were artificially infected with the parasitic nematode Phasmarhabditis hermaphrodita, and analysed for mortality and PO activity levels. We found C. virgata to be more severely affected by P. hermaphrodita infection than C. hortensis, and the dark C. virgata morphs to be more resistant to lethal effects of this infection than pale morphs. However, these differences in sensitivity to the parasite could not clearly be related to different PO activity levels.
Animal Physiological Ecology, University of Tübingen, Konrad-Adenauer-Str. 20, 72072 Tübingen, Germany. Electronic address: alexandra.e.scheil@googlemail.com.
Alexandra E
AE
Scheil
Animal Physiological Ecology, University of Tübingen, Konrad-Adenauer-Str. 20, 72072 Tübingen, Germany.
Stefanie
S
Hilsmann
Animal Physiological Ecology, University of Tübingen, Konrad-Adenauer-Str. 20, 72072 Tübingen, Germany; Transfer Center for Ecotoxicology and Ecophysiology, Blumenstr. 13, 72108 Rottenburg, Germany.
Rita
R
Triebskorn
Animal Physiological Ecology, University of Tübingen, Konrad-Adenauer-Str. 20, 72072 Tübingen, Germany.
Heinz-R
HR
Köhler
D060105:Animal Shells / Q000201:enzymology / Q000276:immunology / Q000469:parasitology*; D000818:Animals; D014442:Monophenol Monooxygenase / Q000378:metabolism*; D010858:Pigmentation / Q000276:immunology*; D012908:Snails / Q000201:enzymology / Q000276:immunology / Q000469:parasitology*; D013045:Species Specificity
D014442:Monophenol Monooxygenase
Gastropod; Molluscs; Parasitic nematode; Phenoloxidase; Polymorphism