#sexualdimorphism — Public Fediverse posts

@Trilobyter Beautiful photograph of the #redbellied #woodpecker, #Melanerpes #carolinus (#Picidae, Aves). A strikingly colored and biologically interesting bird, widespread in the eastern half of the #USA forming monogamous seasonal partnerships.The species is flexible regarding food, habitat, and nesting site. However, it seems to prefer moist, old, and not too densely overgrown deciduous #forests.Only the facial and nape coloration of this strikingly patterned bird exhibits #sexualdimorphism.

A mammals-wide study found no support for Rensch’s rule, a commonly-tested ecological rule that posits that sexual size dimorphism is greater in larger species if males are larger, and in smaller species if females are larger.

Read now ahead of print!
https://www.journals.uchicago.edu/doi/10.1086/738469

#RenschsRule #EEB #SexualDimorphism

Videlier and Sztepanacz re-analyse published data to show that sexual dimorphism may evolve as easily from indirect responses to sexually concordant selection as from direct responses to sexually antagonistic selection.

Read now ahead of print!
https://www.journals.uchicago.edu/doi/10.1086/737019

#SexualDimorphism #EEB

Wiring the sexes: @evolvwing &co use CRISPR knockouts & single-nucleus transcriptomics to decipher the regulatory logic of #SexualDimorphism in sulphur #butterflies, where males display bright UV colors thanks to specialized iridescent scales @PLOSBiology https://plos.io/445Iz7d

In this new Historical Perspective, Ken S. Toyama describes how the original definition of Rensch's rule, which has been overlooked for decades, can impact the way we study sexual dimorphism. Read now ahead of print!
https://www.journals.uchicago.edu/doi/10.1086/735583

#renschsRule #sexualDimorphism #dimorphism #historicalPerspective

Today I learned [via the amazing Merlin Bird ID app] that this is a female #RedWingedBlackbird. While I've never really thought about it, I didn't know about their sexual dimorphism. RWBBs are increasingly hard to come by around here since we've seen so much wetland loss.

I took this photo in June, 2009 🤯 with a Fuji point and shoot, and am only just now paying attention to it. Goes to show, there's always much to learn despite how far you've come.

#MerlinBirdID #Birding #sexualdimorphism #Missouri #KC-ish

@sundogplanets I am certain that #ElephantSeals are worse. Especially the #AlphaMales from the #DeltaQuadrant. They are much larger, much louder, eat more of the crab and calamari that I like the best, and exhibit wildly excessive #SexualDimorphism. The beach masters’ #harem acquisition also condemns many perfectly fine male elephant seals to lives as #incels. I took a #CrownCollege Core class at #UCSC in 1968 from #BurneyLeBoeuf, who was just beginning his studies at #AñoNuevoStatePark while also fathering the field of #Psychobiology. Admittedly, the class was on an unrelated subject—#ScienceCultureAndMan, but, still, #ProveMeWrong.

A nose for love
https://oceanbites.org/a-nose-for-love/

First evidence of #SexualDimorphism in olfactory organs of #DeepSea #lanternfishes (Myctophidae) https://peerj.com/articles/17075/

"In some #lanternfish, males and females are the same size, but males have bigger noses (olfactory rosettes). This suggests that the males have a more sensitive sense of smell, which they could use to detect chemical signals (#pheromones) produced by females."

New study explores the evolution of sexual dimorphism in birds: are colorful males and larger females the result of extra-pair paternity? Learn more from Bart Kempenaers, Mihai Valcu and Cristina Valcu: https://doi.org/10.1111/jeb.14172

#ornithology #evolution #sexualdimorphism #birds #science #ScienceMastodon #scicomm #wisskomm

On the subject of sexual dimorphism in #dinosaurs

#sexualdimorphism

A flock of female Red-Winged Blackbirds stopped by the pond today. Males and females migrate separately and look quite different, with the males being solid black except for scarlet and yellow shoulder patches. ID thanks to the experts on iNaturalist. #BirdPhotography #iNaturalist #BirdMigration #SexualDimorphism

How is diversity maintained in a competitive arena (be it Darwinian or political), when intuitively one would expect a single optimal strategy to succeed over all others? In simulations, stable clusters occur when there is an advantage to being different per se. Such models could explain #SexualDimorphism, #ImmunogeneticVariation, or even #PoliticalParties. But confirming this empirically is a challenge.
#BalancingSelection #FitnessLandscape
#EvolutionarySimulation