Do male and female beetles (Tenebrio molitor) respond differently to rat feces containing eggs from the tapeworm, Hymenolepis diminuta?

John F. Shea

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DOI: 10.4236/ns.2010.28107                

Abstract

Males and females often differ in their susceptibility and exposure to infection. Thus, they may also differ in their ability to avoid infection. The beetle, Tenebrio molitor, risks infection with cysticercoids when ingesting rat feces containing eggs of the tapeworm, Hymenolepis diminuta. Previous studies demonstrated that beetles sometimes prefer infective feces suggesting that the tapeworm influences the foraging behavior of beetles. After recording beetle movement in an arena containing infective and uninfective feces for one hour, sex main effects were not significant, but the effect of sex asked in trials was significant for males. Specifically, more male beetles occurred on the uninfective bait than on the infective bait. This observation suggests that male beetles avoid infective feces, which decreases their probability of infection with H. diminuta. If the cost of infection is higher in males, then selection to avoid infective feces may act more strongly on males.

Keywords

Hymenolepis diminuta; Cysticercoid; Tenebrio molitor; Behavior; Coprophagy; Parasite Manipulation

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Zuk, M. and McKean, K.A. (1996) Sex differences in parasitic infections: Patterns and processes. International Journal for Parasitology, 26(10), 1009-1024.
[2]	Poulin, R. (1996) Sexual inequalities in helminth infections: A cost of being a male? The American Naturalist, 147(2), 287-295.
[3]	Schalk, G. and Forbes, M.R. (1997) Male biases in parasitism of mammals: Effects of study type, host, age, and parasite taxon. Oikos, 78(1), 67-74.
[4]	Sheridan, L.A., Poulin, R., Ward, D.F. and Zuk, M. (2000) Sex differences in parasitic infections among arthropod hosts: Is there is a male bias? Oikos, 88(2), 327-334.
[5]	Pappas, P.W., Marschall, E.A., Morrison, S.E., Durka, G.M. and Daniel, C.S. (1995) Increased coprophagic activity of the beetle, tenebrio molitor, on feces containing eggs of the tapeworm, hymenolepis diminuta. International Journal for Parasitology, 25(10), 1179-1184.
[6]	Gray, D.A. (1998) Sex differences in susceptibility of house crickets, acheta domesticus, to experimental infection with serratia liquefaciens. Journal of Invertebrate Pathology, 71(3), 288-289.
[7]	Wedekind, C. and Jakobsen, P.J. (1998) Male-biased susceptibility to helminth infection: An experimental test with a copepod. Oikos, 81(3), 458-462.
[8]	Kurtz, J., Wiesner, A., G?tz, P. and Sauer, K.P. (2000) Gender differences and individual variation in the immune system of the scorpionfly panorpa vulgaris (Insecta: Mecoptera). Developmental and Comparative Immunology, 24(1), 1-12.
[9]	Adamo, S.A., Jensen, M. and Younger, M. (2001) Changes in lifetime immunocompetence in male and female gryllus texensis (formerly G. integer): Trade-offs between immunity and reproduction. Animal Behaviour, 62(3), 417-425.
[10]	Reimchen, T.E. and Nosil, P. (2001) Ecological causes of sex-biased parasitism in threespine stickleback. Biological Journal of the Linnean Society, 73(1), 51-63.
[11]	Hecker, K.R., Forbes, M.R. and Leonard, N.J. (2002) Parasitism of damselflies (Enallagma boreale) by gregarines: sex biases and relations to adult survivorship. Canadian Journal of Zoology, 80(1), 162-168.
[12]	Klein, S.L. (2000) The effects of hormones on sex differences in infection: From genes to behavior. Neuroscience and Biobehavioral Reviews, 24(6), 627-638.
[13]	Evans, W.S., Hardy, M.C., Singh, R., Moodie, G.E. and Cote, J.J. (1992) Effect of the rat tapeworm, hymenolepis diminuta, on the coprophagic activity of its intermediate host, tribolium confusum. Canadian Journal of Zoology, 70(12), 2311-2314.
[14]	Shostak, A.W. and Smyth, K.A. (1998) Activity of flour beetles (Tribolium confusum) in the presence of feces from rats infected with rat tapeworm (Hymenolepis diminuta). Canadian Journal of Zoology, 76(8), 1472- 1479.
[15]	Shea, J.F. (2007) Lack of preference for infective faeces in Hymenolepis diminuta-infected beetles (Tenebrio molitor). Journal of Helminthology, 81(3), 293-299.
[16]	Pappas, P.W. and Leiby, D.A. (1986) Variation in the sizes of eggs and oncospheres and the numbers and distributions of testes in the tapeworm, hymenolepis diminuta. Journal of Parasitology, 72(3), 383-391.
[17]	Bhattacharya, A.K., Ameel, J.J. and Waldebauer, G.P. (1970) A method for sexing living pupal and adult yellow mealworms. Annals of the Entomological Society of America, 63, 1783-1785.
[18]	Van der Wal, R., Irvine, J., Stien, A., Shepherd, N. and Albon, S.D. (2000) Faecal avoidance and the risk of infection by nematodes in a natural population of reindeer. Oecologica, 124(1), 19-25.
[19]	Hutchings, M.R., Kryriazakis, I., Anderson, D.H., Gordon, I.J. and Coop, R.L. (1998) Behavioural strategies used by parasitized and non-parasitized sheep to avoid ingestion of gastro-intestinal nematodes associated with faeces. Animal Science, 67, 97-106.
[20]	Hurd, H. and Arme, C. (1986) Hymenolepis diminuta: The effects of metacestodes upon egg production and viability in the intermediate host tenebrio molitor. Journal of Invertebrate Pathology, 47(2), 225-230.
[21]	Worden, B.D., Parker, P.G. and Pappas, P.W. (2000) Parasites reduce the attractiveness and reproductive success in male grain beetles. Animal Behaviour, 59(3), 543-550.
[22]	Hurd, H. and Parry, G. (1991) Metacestode-induced depression of the production of, and response to, sex pheromone in the intermediate host tenebrio molitor. Journal of Invertebrate Pathology, 58(1), 82-87.
[23]	Yan, G. and Norman, S. (1995) Infection of tribolium beetles with a tapeworm: Variation in susceptibility within and between beetle species and among genetic strains. The Journal of Parasitology, 81(1), 37-42.
[24]	Shea, J.F. (2005) The effect of Hymenolepis diminuta (Cestoda) cysticercoids on the weight change, frass production, and food intake of the intermediate host, tenebrio molitor (Coleoptera). Parasitology Research, 98(1), 1-4.
[25]	Hurd, H. and Ardin, R. (2003) Infection increases the value of nuptial gifts, and hence male reproductive success, in the hymenolepis diminuta-tenebrio molitor association. Proceedings of the Royal Society of London B, 270, S172-S174.
[26]	Hurd, H., Warr, E. and Polwart, A. (2001) A parasite that increases host lifespan. Proceedings of the Royal Society of London B, 268(1477), 1749-1753.
[27]	Rau, M.E. (1979) The frequency distribution of Hymenolepis diminuta cysticercoids in natural, sympatric populations of Tenebrio molitor and T. obscurus. International Journal for Parasitology, 9(2), 85-87.
[28]	Tschinkel, W., Willson, C. and Bern, H. (1967) Sex pheromone of the mealworm beetle. (Tenebrio molitor). Journal of Experimental Zoology, 164(1), 81-85.
[29]	Hurd, H. and Fogo, S. (1991) Changes induced by Hymenolepis diminuta (Cestoda) in the behaviour of the intermediate host Tenebrio molitor (Coleoptera). Canadian Journal of Zoology, 69(9), 2291-2294.