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Copying in birds, dolphins, and viruses; evolution & environmental change; evolution of mutation rate

Learning and signal copying facilitate communication among bird species "where only two species regularly interact, one species' [alarm] calls incorporate the call of the other."

Vocal copying of individually distinctive signature whistles in bottlenose dolphins "Copying occurred almost exclusively between close associates such as mother-calf pairs and male alliances during separation... copies were clearly recognizable as such because copiers consistently modified some acoustic parameters of a signal when copying it... no evidence for the use of copying in aggression or deception."

A bacteriophage encodes its own CRISPR/Cas adaptive response to evade host innate immunity "the only documented bacterial adaptive immune system is the CRISPR/Cas... a phage-encoded CRISPR/Cas system is used to counteract a phage inhibitory chromosomal island of the bacterial host. "

Evolutionary rescue from extinction is contingent on a lower rate of environmental change" "By assessing fitness of these engineered [E. coli] strains across a range of drug concentrations, we show that certain genotypes are evolutionarily inaccessible under rapid environmental change."

Fossil evidence for a hyperdiverse sclerophyll flora under a non-Mediterranean-type climate "sclerophyll hyperdiversity has developed in distinctly non-Mediterranean climates... likely a response to long-term climate stability."

A trade-off between oxidative stress resistance and DNA repair plays a role in the evolution of elevated mutation rates in bacteria "The dominant paradigm for the evolution of mutator alleles in bacterial populations is that they spread by indirect selection for linked beneficial mutations when bacteria are poorly adapted... [but] hydrogen peroxide, generates direct selection for an elevated mutation rate in the pathogenic bacterium Pseudomonas aeruginosa as a consequence of a trade-off between the fidelity of DNA repair and hydrogen peroxide resistance."


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