Collective defenses of garden ants against a fungal pathogen (Record no. 374045)

000 -LEADER
fixed length control field 04287ntm a22003137a 4500
003 - CONTROL NUMBER IDENTIFIER
control field AT-ISTA
005 - DATE AND TIME OF LATEST TRANSACTION
control field 20190904111042.0
008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION
fixed length control field 190829s2019 au ||||| m||| 00| 0 eng d
040 ## - CATALOGING SOURCE
Transcribing agency IST
100 ## - MAIN ENTRY--PERSONAL NAME
Personal name Casillas Perez, Barbara Elisa
9 (RLIN) 5945
245 ## - TITLE STATEMENT
Title Collective defenses of garden ants against a fungal pathogen
260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT)
Name of publisher, distributor, etc. IST Austria
Date of publication, distribution, etc. 2019
500 ## - GENERAL NOTE
General note Thesis
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Formatted contents note Abstract
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Formatted contents note Acknowledgements
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Formatted contents note About the Author
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Formatted contents note List of Publications
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Formatted contents note List of Figures
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Formatted contents note List of Abbreviations
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Formatted contents note 1 Background
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Formatted contents note 2 Organisational Immunity in Social Insects
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Formatted contents note 3 Sanitary care dynamics and pathogen transmission
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Formatted contents note 4 Effect of queen pathogen-contamination on colony development
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Formatted contents note 5 Computational analysis of behavior
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Formatted contents note Bibliography
520 ## - SUMMARY, ETC.
Summary, etc. Social insect colonies tend to have numerous members which function together like a single organism in such harmony that the term ``super-organism'' is often used. In this analogy the reproductive caste is analogous to the primordial germ cells of a metazoan, while the sterile worker caste corresponds to somatic cells. The worker castes, like tissues, are in charge of all functions of a living being, besides reproduction. The establishment of new super-organismal units (i.e. new colonies) is accomplished by the co-dependent castes. The term oftentimes goes beyond a metaphor. We invoke it when we speak about the metabolic rate, thermoregulation, nutrient regulation and gas exchange of a social insect colony. Furthermore, we assert that the super-organism has an immune system, and benefits from ``social immunity''. Social immunity was first summoned by evolutionary biologists to resolve the apparent discrepancy between the expected high frequency of disease outbreak amongst numerous, closely related tightly-interacting hosts, living in stable and microbially-rich environments, against the exceptionally scarce epidemic accounts in natural populations. Social immunity comprises a multi-layer assembly of behaviours which have evolved to effectively keep the pathogenic enemies of a colony at bay. The field of social immunity has drawn interest, as it becomes increasingly urgent to stop the collapse of pollinator species and curb the growth of invasive pests. In the past decade, several mechanisms of social immune responses have been dissected, but many more questions remain open. I present my work in two experimental chapters. In the first, I use invasive garden ants (*Lasius neglectus*) to study how pathogen load and its distribution among nestmates affect the grooming response of the group. Any given group of ants will carry out the same total grooming work, but will direct their grooming effort towards individuals carrying a relatively higher spore load. Contrary to expectation, the highest risk of transmission does not stem from grooming highly contaminated ants, but instead, we suggest that the grooming response likely minimizes spore loss to the environment, reducing contamination from inadvertent pickup from the substrate. The second is a comparative developmental approach. I follow black garden ant queens (*Lasius niger*) and their colonies from mating flight, through hibernation for a year. Colonies which grow fast from the start, have a lower chance of survival through hibernation, and those which survive grow at a lower pace later. This is true for colonies of naive and challenged queens. Early pathogen exposure of the queens changes colony dynamics in an unexpected way: colonies from exposed queens are more likely to grow slowly and recover in numbers only after they survive hibernation. In addition to the two experimental chapters, this thesis includes a co-authored published review on organisational immunity, where we enlist the experimental evidence and theoretical framework on which this hypothesis is built, identify the caveats and underline how the field is ripe to overcome them. In a final chapter, I describe my part in two collaborative efforts, one to develop an image-based tracker, and the second to develop a classifier for ant behaviour.
856 ## - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier <a href="https://doi.org/10.15479/AT:ISTA:6435">https://doi.org/10.15479/AT:ISTA:6435</a>
942 ## - ADDED ENTRY ELEMENTS (KOHA)
Source of classification or shelving scheme
Holdings
Withdrawn status Lost status Source of classification or shelving scheme Damaged status Not for loan Permanent Location Current Location Date acquired Barcode Date last seen Price effective from Koha item type
  Not Lost       Library Library 2019-08-29 AT-ISTA#001901 2019-08-29 2019-08-29 Book

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