Nicolas Alexandre
@nicmalexandre.bsky.social
π€ 66
π₯ 15
π 24
reposted by
Nicolas Alexandre
Christopher Witt
6 months ago
New paper on ecosystem-wide PFAS contamination at Holloman AFB, New Mexico
authors.elsevier.com/c/1lAOb3Ao6B...
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reposted by
Nicolas Alexandre
Lizzy Steell
6 months ago
Excited to share an invited commentary about the fantastic and ambitious work by
@nicmalexandre.bsky.social
and colleagues in
@globalchangebio.bsky.social
on Anna's Hummingbird beaks. It was a joy to write about, congratulations on a super cool study!
onlinelibrary.wiley.com/doi/10.1111/...
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Fitting the Bill in an Urban World: Hummingbird Beak Shape Responds to Anthropogenic Factors
Click on the article title to read more.
https://onlinelibrary.wiley.com/doi/10.1111/gcb.70199
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Take a look at
@science.org
's article describing our work in
@globalchangebio.bsky.social
showing that beak morphology of hummingbirds has changed in association with feeders!
science.org/content/arti...
add a skeleton here at some point
6 months ago
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π¨New paper alert!π¨ We show that hummingbird beaks have changed in shape & size since around WWII, driven by the rise of commercialized feeders! π§΅ π Paper:
dx.doi.org/10.1111/gcb....
#ornithology
#evolution
#GlobalChangeBiology
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Supplemental Feeding as a Driver of Population Expansion and Morphological Change in Anna's Hummingbirds
Bird beaks are highly adaptable, with the potential to undergo rapid morphological shifts in response to environmental change such as climatic variation or food availability. Anna's Hummingbirds (Cal...
http://dx.doi.org/10.1111/gcb.70237
6 months ago
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The starry sturgeon (A. stellatus) carries extra Hox genes, genes that control body plans, but not all are active! After genome duplications, some genes turned off, while others evolved new functions.
#2025MMM
#RIP
8 months ago
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Gemmel et al sequence the Tuatara genome in 2020 and found the lineage diverged from snakes and lizards 250 Mya. The tuatara genome is 2.4Γ larger than the anole genome but 64% of it is repetitive sequences and has the highest percentage of methylation for an amniote
#2025MMM
doi.org/10.1038/s415...
8 months ago
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Sturgeons have undergone multiple whole-genome duplications, making some species octoploid (8x their original genome)! A. stellatus is a βlow-ploidyβ sturgeon, but its DNA still carries echoes of ancient duplications.
#2025MMM
doi.org/10.1038/s415...
8 months ago
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The genomes of arbuscular mycorrhizal (AM) fungi reveal they have lost some metabolic pathways relative to free-living fungi. Kobayashi et al 2018 find that thiamine, vitamin B6, and some glucose-producing polysaccharide hydrolases biosynthesis is absent in AM
#2025MMM
#RIP
doi.org/10.1186/s128...
8 months ago
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Glomeromycotina is a lineage of early diverging fungi that establish arbuscular mycorrhizal (AM) symbiosis with land plants. Morin et al 2019 find that AM genomes contain a lot more species-specific genes than other fungi, which reflects their unique lifestyle
#2025MMM
doi.org/10.1111/nph....
8 months ago
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Zhao et al in 2019 sequenced 545 genomes of ginkgos and found 3 centers of genetic diversity in China. Ginkgos grown outside China trace their ancestry to the East population, and American and European trees carry genetic variation that is rare in wild populations.
doi.org/10.1038/s414...
#2025MMM
8 months ago
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A fern genome contains all the instructions for two independent multi-cellular phases: a gametophyte (prothallus) and a sporophyte (fern). Yet, Marchant et al 2023 find only 273 and 1,397 genes were specifically expressed in the gametophyte and sporophyte
#2025MMM
#RIP
doi.org/10.1038/s414...
8 months ago
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Ferns are the second most species-rich lineage of land plants. Fujiwara et al 2023 found that fern genome sizes have grown as fern have diversified, showing large structural complexity between different fern species due to whole genome duplications and polyploidy
#2025MMM
doi.org/10.1093/aob/...
8 months ago
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The frilled shark (Chlamydoselachus anguineus) has barely changed for 80 million years! π¦ Its DNA reveals it's one of the most ancient sharks, diverging before most modern species existed. A true relic of deep-sea evolution! π
#2025MMM
doi.org/10.1155/2013...
8 months ago
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