Mark-release-recapture studies reveal preferred spatial and temporal behaviors of Anopheles barbirostris in West Sulawesi, Indonesia.

BACKGROUND

Population density, dispersion patterns, flight distances, and survival rate of vector mosquitoes are all contributors to vectorial capacity that may be estimated in a single experimental method: mark-release-recapture (MRR). In this study, these key parameters were measured for mosquito populations in Karama, West Sulawesi, Indonesia.

METHODS

Two mark-release-recapture (MRR) experiments were carried out in Karama village to characterize seasonality differences, if any: wet season (December 2013, MRR1) and dry season (May 2014, MRR2). For both experiments, mosquitoes were marked according to release site/date and were released on four consecutive nights. Four sampling methodologies were utilized to enable recapture: human landing catches (HLCs), kelambu traps and barrier screens.

RESULTS

98.7% of all catches were molecularly confirmed as Anopheles barbirostris. During the wet season, An. barbirostris demonstrated no preference toward endophagy. In the dry season, An. barbirostris demonstrated an endophagic preference. The duration of the feeding cycle for An. barbirostris was determined to be 5 days during the wet season and 3.7 days during the dry season, though an anomaly likely caused the wet season feeding cycle to be overestimated. The largest percentages of recaptured mosquitoes were collected in a single site during both seasons. The only significant relationship with mosquito dispersal was site of release and recapture. Finally, dispersal rates of An. barbirostris frequently ranged up to 800 m (the maximum measurable distance in this study) within a single day of release.

CONCLUSIONS

This study estimated key vector parameters for An. barbirostris an understudied species complex, in Karama, West Sulawesi, Indonesia. Despite the length of the feeding cycle, the high indoor biting rates demonstrated by An. barbirostris in Karama suggest that the use of IRSs and LLINs, especially during the dry season, would have a substantial impact on the panmictic An. barbirostris population.