Cactus-fungi interactions mediate host preference in cactophilic Drosophila (Diptera, Drosophilidae)

SOTO, EM; SOTO, IM; MILLA CARMONA, P; MONGIARDINO-KOCH N; HASSON, E

BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2017 vol. 122 p. 539 - 548

0024-4066

<!-- /* Style Definitions */p.MsoNormal, li.MsoNormal, div.MsoNormal{mso-style-unhide:no;mso-style-qformat:yes;mso-style-parent:"";margin:0cm;margin-bottom:.0001pt;mso-pagination:widow-orphan;font-size:12.0pt;font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman";mso-ansi-language:ES;}.MsoChpDefault{mso-style-type:export-only;mso-default-props:yes;font-size:10.0pt;mso-ansi-font-size:10.0pt;mso-bidi-font-size:10.0pt;}@page WordSection1{size:612.0pt 792.0pt;margin:70.85pt 3.0cm 70.85pt 3.0cm;mso-header-margin:36.0pt;mso-footer-margin:36.0pt;mso-paper-source:0;}div.WordSection1{page:WordSection1;}-->The cactophilic flies Drosophila buzzatii and D. koepferaeare each generally associated with a single host cactus, although resourcesharing also occurs in regions of sympatry. Host s has been shown to affect severalfitness-related traits, but the mechanisms determining it are poorly understood.In this paper, we investigate how alternative cacti and cactophilic fungi modulateadult host preference (olfaction preference and oviposition behavior) in bothspecies. All aspects of flies´ resource selection behaviors seem to be drivenby both the cactus and the microorganism encountered. In the presence of some fungiboth fly species exhibit strong preferences for their respective primary host,while other fungi obliterate differences in preference. Similarly, ovipositionbehavior was strongly modulated by particular host-fungus combinations. Overall,the observed patterns of host selection and exploitation in these flies seem tobe largely determined by the interaction between the cactus species andonly asubset of cactophilic fungi, including the filamentous fungus Bisifusarium lunatum and the yeast Sporopachydermia cereana ´australis´. Theevolution of alternative strategies associated with the election of natural breedingresources has played a crucial role in the divergence of the D. buzzatii and D. koepferae lineages and might be based on rather simpledecision-making scenarios.