Host manipulation by Wolbachia is a neutral trait within a single population
Article Abstract:
In response to L. Stevens's article it is argued that intracellular bacterium Wolbachia pipientis manipulates host mating in such a way that within a single population manipulator alleles are neutral relative to non-manipulator alleles. A model for a population infected by non-manipulating and manipulating forms of W. pipientis shows that natural selection hardly favors manipulation of host mating behavior. If host manipulation in W. pipientis is assumed to be an adaptation, then it is a trait whose spreading depends on population substructure and selection among subpopulation.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1996
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Cooperative signalling between opponents in fish fights
Article Abstract:
The colour displays used by cichlids of the species Nannacara anomala during fights may serve to transmit assessment information and seem to indicate cooperative signalling between opponents. It is most likely that the signals act as alerting components or amplifiers to the performance signals that follow. It appears that the suppression of colour displays may have some competitive value. This research supports the hypothesis that fighting behaviour may have some cooperative aspects.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1997
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Experimental manipulation of helping in a cooperative breeder: Helpers 'pay to stay' by pre-emptive appeasement
Article Abstract:
A study was conducted to test whether the helping and social behaviors of group members of the cooperatively breeding cichlid Neolamprologus pulcher changes, as claimed by the 'pay-to-stay hypothesis'. Observations found that helpers increased helping behavior after being prevented from helping and agonistic interactions between focal helpers and dominants were reduced with the help.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 2005
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