Ecological variation and plumage patterns in birds

Pathways to elaboration of sexual dimorphism in bird plumage patterns

Reported on 12/19/13 as Evolution of Plumage Patterns in Male and Female Birds

Excerpt: “…what I found was that plumage patterning is remarkably labile — both male and female birds have the capacity to change between different types of patterns. What’s interesting is to consider what are the forces driving these changes in male and female plumage patterns…”

My comment: In my model, ecological variation results in amino acid substitutions and adaptations. For example, we know that in some birds “…a single amino acid substitution contributes to speciation.” No experimental evidence suggests a link from any mutation to different plumage color is involved in speciation. “Birds from a second satellite island (Ugi) do not show the same perfect association between this MC1R variant and plumage color, suggesting an alternative mechanism for melanism on this island.” 

We now have learned more about ecological variation and the remarkably labile plumage patterns of other birds. “We propose that other genes such as POMC, Agouti or any other genes involved in pigment synthesis will need to be investigated in future studies if we are to understand how selection shapes complex patterns of melanin-based plumage pigmentation.” What we’ve learned about DNA methylation from Agouti alone will make it harder for theorists to claim that mutation-initiated natural selection is responsible for species diversification associated with plumage color.

What we’ve learned about plumage patterns will also make it harder for theorists to emphasize the importance of auditory cues or anything other that what is known to cause nutrient-dependent pheromone-controlled ecological adaptations in every other species on the planet.

Clearly, we’ve learned that experimental evidence must begin to support the theorists claims. For example, in all vertebrates, the de novo creation of olfactory receptor genes is linked to amino acid substitutions and species diversity.  See for more information: Birds: A single amino acid change and plumage (11/24/13)

About James V. Kohl 1308 Articles
James Vaughn Kohl was the first to accurately conceptualize human pheromones, and began presenting his findings to the scientific community in 1992. He continues to present to, and publish for, diverse scientific and lay audiences, while constantly monitoring the scientific presses for new information that is relevant to the development of his initial and ongoing conceptualization of human pheromones. Recently, Kohl integrated scientific evidence that pinpoints the evolved neurophysiological mechanism that links olfactory/pheromonal input to genes in hormone-secreting cells of tissue in a specific area of the brain that is primarily involved in the sensory integration of olfactory and visual input, and in the development of human sexual preferences. His award-winning 2007 article/book chapter on multisensory integration: The Mind’s Eyes: Human pheromones, neuroscience, and male sexual preferences followed an award winning 2001 publication: Human pheromones: integrating neuroendocrinology and ethology, which was coauthored by disinguished researchers from Vienna. Rarely do researchers win awards in multiple disciplines, but Kohl’s 2001 award was for neuroscience, and his 2007 “Reiss Theory” award was for social science. Kohl has worked as a medical laboratory scientist since 1974, and he has devoted more than twenty-five years to researching the relationship between the sense of smell and the development of human sexual preferences. Unlike many researchers who work with non-human subjects, medical laboratory scientists use the latest technology from many scientific disciplines to perform a variety of specialized diagnostic medical testing on people. James V. Kohl is certified with: * American Society for Clinical Pathology * American Medical Technologists James V. Kohl is a member of: * Society for Neuroscience * Society for Behavioral Neuroendocrinology * Association for Chemoreception Sciences * Society for the Scientific Study of Sexuality * International Society for Human Ethology * American Society for Clinical Laboratory Science * Mensa, the international high IQ society