LACK OF BEHAVIORAL FEVER IN NEMATODE-PARASITIZED DROSOPHILA

The parasitic nematode Howardula aoronymphium causes severe fertility reduction and sterility in females of several species of mycophagous D rosophila. Infected females of Drosophila putrida recover their fertil ity when kept at a postemergence temperature of 29 C but not when kept at 27 C or below. When given a choice of temperatures in a thermal gr adient, neither this species, Drosophila falleni, nor Drasophila neote stacea manifested adaptive behavioral fever in response to parasitism. However, our conclusions concerning D. neotestacea and D. falleni rem ain tentative because of small sample sizes.