MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
OVIPOSITION AND PERFORMANCE IN NATURAL HOSTS IN CACTOPHILIC DROSOPHILA
SOTO, E, J GOENAGA, JP HURTADO & E HASSON
Lugar: New York; Año: 2012 vol. 26 p. 975 - 975
he cactus-‐yeast-‐Drosophila model system provides an excellent opportunity to investigate the significance of ecological factors in evolution. The South American D. buzzatii and D. koepferae are two closely related sibling species, with partially overlapping distribution ranges and a certain degree of niche overlap. The main breeding and feeding resources of D. buzzatii are the decaying cladodes of prickly pears (genus Opuntia), whereas D. koepferae utilizes mainly columnar cacti of the g enera Cereus and Echinopsis. These host plants differ in their chemical composition, the microflora associated to the decaying process and patterns of spatial and temporal predictability. The aim of this work is to investigate host plant selection and utilization of two different cactus hosts. We report the results of field and laboratory studies examining behavioral traits related to egg -‐laying (oviposition preference and host acceptance) and several measures of performance (viability, developmental time, wing morphology and starvation resistance) in flies reared in the two main host cacti that D. koepferae and D. buzzatii exploit in the studied area: O. sulphurea and E. terschekii. The main conclusion of the assessment of the distribution of adult flies in relation to the abundance of the host plants, attraction to and emergence from substrates of both host plants, larval and adult fitness performance and behavioral traits is the remarkable influence that cactus hosts impose on the life history of the cactophilic sibling species D. buzzatii and D. koepferae.