Interaction between Workers during a Short Time Window Is Required for Bacterial Symbiont Transmission in Acromyrmex Leaf-Cutting AntsReport as inadecuate




Interaction between Workers during a Short Time Window Is Required for Bacterial Symbiont Transmission in Acromyrmex Leaf-Cutting Ants - Download this document for free, or read online. Document in PDF available to download.

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.



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

Source: http://plos.srce.hr/



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