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Putative microbial defenses in a social spider: immune variation and antibacterial properties of colony silk

The accumulation of microbes in and around the large, perennial nests of social arthropods can increase the potential for interactions between individuals and harmful pathogens. Accordingly, many social insects utilize multiple organizational lines of individual and collective defenses against micro...

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Published in:The Journal of arachnology 2015-11, Vol.43 (3), p.394-399
Main Authors: Keiser, Carl N., DeMarco, Alexander E., Shearer, Taylor A., Robertson, Jessica A., Pruitt, Jonathan N.
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Language:English
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cited_by cdi_FETCH-LOGICAL-b411t-7e32ae770f2b87edf2576e35259a0f70d4059a7792e3466e4f4058cc27e1cfb23
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creator Keiser, Carl N.
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description The accumulation of microbes in and around the large, perennial nests of social arthropods can increase the potential for interactions between individuals and harmful pathogens. Accordingly, many social insects utilize multiple organizational lines of individual and collective defenses against microbes. The interaction between microbes and social spiders, however, has been almost entirely unexplored. Here, we use the social spider Stegodyphus dumicola Pocock 1898 (Araneae: Eresidae) to (1) probe how innate immunity varies among individuals and (2) determine if two types of silk extracted from their colonies can inhibit the growth of the entomopathogenic bacteria Bacillus thuringiensis. Individual spiders’ innate immunity against lyophilized cells of Micrococcus luteus varied negatively with their boldness, a behavioral metric important for individual foraging and the organization of collective behaviors. Further, silk from both the capture webs and retreats of uncontaminated colonies inhibited the growth of B. thuringiensis to a small degree. Thus, web construction might represent a form of collective anti-microbial defense in these social spiders. This preliminary evidence suggests that social spider societies may exhibit antimicrobial defenses on multiple levels of organization, including both individual- and group-level defenses.
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ispartof The Journal of arachnology, 2015-11, Vol.43 (3), p.394-399
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source JSTOR Archival Journals and Primary Sources Collection
subjects Antibacterial defense
Antibacterials
Antimicrobials
Bacillus thuringiensis
Biological sciences
Ecological life histories
Featured s
Health aspects
Host-bacteria relationships
Immunity
Insect behavior
Insect nests
Microorganisms
Observations
silk
Social insects
Spiders
Stegodyphus dumicola
title Putative microbial defenses in a social spider: immune variation and antibacterial properties of colony silk
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