a1 Laboratoire d'Ecologie, URA 258, CNRS, Université Pierre et Marie Curie, Bât A, 7ème étage, case 237, 7 quai St-Bernard, 75252 Paris Cedex 05, France
The effect of haemoparasites on the physiology and behaviour traits of their hosts was examined using Haemogregarina sp., a parasite of the common lizard, Lacerta vivipara, from the south of France. Infection with haemogregarines was associated with a reduced haemoglobin concentration and an increased number of immature red blood cells. Parasitized individuals also showed a reduced oxygen consumption at rest and a lower locomotor speed. We also found that the multiplication rate of the parasite depended on the temperature at which the lizard was maintained. Between 21 and 28 °C the multiplication rate of the parasite was significantly lower than between 29 and 35 °C. This suggests that the parasites may suffer reproductive costs when hosts reduce their body temperature.
(Received February 26 1996)
(Revised May 29 1996)
(Accepted May 29 1996)