Female lineages of European cuckoos lay eggs with colorful shells and intricate patterns specialized to deceive more than 100 avian hosts into fostering their chicks.
Female lineages of European cuckoos lay eggs with colorful shells and intricate patterns specialized to deceive more than 100 avian hosts into fostering their chicks.Parasitic cuckoos are truly remarkable birds.
Not only do they they lead peculiar social lives, but in doing so, they show us how the process of evolution actually works. For example, many cuckoo species rely upon other bird species to raise their chicks for them; an unusual life history trait known as “brood parasitism”. As you might expect, the host birds are not very happy about this deception and blatant theft of their efforts and resources to benefit another species’ chicks, so the host birds learn to quickly detect and discard cuckoo eggs from their nests, leading to evolution of even more cleverly disguised cuckoo eggs. In response, cuckoos have evolved a number of fascinating methods for preventing their eggs from being detected, such as altering their eggshell colors and patterns so they more closely match those of their hosts. This, in short, is an evolutionary arms’ race.“Cuckoos are simply irresistible for an evolutionary biologist,” said the lead author of the recently published study, evolutionary bioinformatician Justin Merondun, a postdoctoral research scientist with the Ludwig-Maximilians-Universität München . Dr Merondun’s research is primarily focused on connecting DNA sequencing data to observable phenotypes and understanding the evolutionary processes that maintain variation. “They are locked in a perpetual Red Queen race with not one, but multiple host species, and they have evolved a suite of adaptive traits to stay ahead,” Dr Merondun told me in email. The “Red Queen race” is a metaphor in evolutionary biology that originally came from Lewis Carroll’s 1871 fantasy novel,where the characters run as fast as they possibly can yet still only manage to stay in the same place. “Matching egg mimicry is the famous one, but even the grey and rufous female-specific plumage colours may help them slip past host defenses.” , is that both of these traits map onto female-inherited genetic sequences like the W chromosome and mitochondrial DNA,” Dr Merondun told me in email. Dr Merondun also told me that the presence of these genes on the W chromosome ensures direct inheritance from mothers to daughters without recombination or reshuffling from males – much like the Y chromosomes in mammals – so daughters produce the same base eggshell color as their mothers.genes are mostly autosomal and come from both European cuckoo parents. This is in stark contrast to what they saw oriental cuckoos, whose eggshell color and patterning genes were mainly located on autosomes in both parents. F I G U R E 2 | Matrilineal variation is associated with egg diversification in C. canorus. Matrilineal W chromosome phylogeny , with corresponding autosomal groups , geographic groups , and egg morphs indicated below each tip, each representing an unrelated female with known egg morph. Diamonds indicate node support exceeding 95% . Phenotypic variation within canorus and optatus egg morphs. Variation explained by continuous pairwise distance matrices of matrilineal, geographic, or autosomal variation estimated with a distance-based redundancy analysis. Egg phenotype matching among varying degrees of related canorus. Egg morph predicted with machine learning using either autosomal ancestry cluster and geographic group alone or with the addition of haplogroup . Confusion matrix of predictive modeling shows the proportion of correct classifications across 100 bootstrapped replicates. The area under the curve 95% confidence interval across replicates is indicated below each label. Confusion matrix for optatus.How do female cuckoos lay their eggs in the appropriate host species nest? “This is tricky question,” Professor Wolf explained in email. “There is some evidence that the females imprint on the host that raised them, but the match is clearly not absolute. There is still a lot of variation of where eggs are deposited, which after all is the precondition for host race shifts in the first place.” “And then, some hosts are just much more abundant and accessible in certain areas, which may also facilitate adaptation in the absence of strict host choice,” Professor Wolf added. This observation provides further support for the idea that evolutionary lineages of female European cuckoos do exist based on their eggshell colors and patterns, with each of them adapted to a specific avian host species. But laying eggs exclusively in the “correct” host nests could lead to new cuckoo species, so how do these distinct lineages avoid becoming separate species?male without losing their special adaptation to their specific host because it is carried mainly on her sex-chromosome and her mitochondrial genome, Professor Wolf told me in email. This preserves the flow of genetic information across the rest of the genome, thereby ensuring they remain one species. “And that is precisely what we observe: The huge cuckoo population throughout Eurasia is almost genetically identical within DNA regions inherited from both parents,” Professor Wolf said. Tragically, despite these birds’ remarkable adaptability to their hosts, European cuckoo populations are in trouble, declining in many regions of Eurasia by as much as 65% since the 1980s .
Cuckoos Brood Parasitism Genomics Cuculus Canorus Cuculus Optatus Egg Colors Mitochondria W Chromosome Grrlscientist
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