Interaction between Workers during a Short Time Window Is Required for Bacterial Symbiont Transmission in Acromyrmex Leaf-Cutting AntsReportar como inadecuado




Interaction between Workers during a Short Time Window Is Required for Bacterial Symbiont Transmission in Acromyrmex Leaf-Cutting Ants - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Stable associations between partners over time are critical for the evolution of mutualism. Hosts employ a variety of mechanisms to maintain specificity with bacterial associates. Acromyrmex leaf-cutting ants farm a fungal cultivar as their primary nutrient source. These ants also carry a Pseudonocardia Actinobacteria exosymbiont on their bodies that produces antifungal compounds that help inhibit specialized parasites of the ants- fungal garden. Major workers emerge from their pupal cases eclose symbiont-free, but exhibit visible Actinobacterial coverage within 14 days post-eclosion. Using subcolony experiments, we investigate exosymbiont transmission within Acromyrmex colonies. We found successful transmission to newly eclosed major workers fostered by major workers with visible Actinobacteria in all cases 100% acquiring, n = 19. In contrast, newly eclosed major workers reared without exosymbiont-carrying major workers did not acquire visible Actinobacteria 0% acquiring, n = 73. We further show that the majority of ants exposed to major workers with exosymbionts within 2 hours of eclosion acquired bacteria 60.7% acquiring, n = 28, while normal acquisition did not occur when exposure occurred later than 2 hours post-eclosion 0% acquiring, n = 18. Our findings show that transmission of exosymbionts to newly eclosed major workers occurs through interactions with exosymbiont-covered workers within a narrow time window after eclosion. This mode of transmission likely helps ensure the defensive function within colonies, as well as specificity and partner fidelity in the ant-bacterium association.



Autor: Sarah E. Marsh, Michael Poulsen, Adrián Pinto-Tomás, Cameron R. Currie

Fuente: http://plos.srce.hr/



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