Cristian C. L.

PhD (Biology),
Posdoc y profesor en UAEH
Twits a título personal

[Andrej Spiridonov @AndrejSpiridon4]

Updated Fossilworks
https://t.co/xbC6BdOQGA

[Science Magazine @ScienceMagazine]

Japan’s 2025 bear crisis, which produced 232 casualties, has been widely attributed to rapid population growth, but a new @ScienceAdvances study shows that a compounding breakdown of the forest’s food supply drove the surge in bear attacks. https://t.co/mCzzrUA9qr

[LaRespo2.0 @LaRespo2]

Después de los 90’s ya este mundo
Es pura decadencia.

[Daniel Tabin @DanTabin]

Very interesting article about Bat evolution and ancestral distribution

[Andrej Spiridonov @AndrejSpiridon4]

Just a reminder, that birds had 1.6 times more history before the K-Pg impact than the duration of the Cenozoic Era.
My bet would be that we are severely underestimating Mesozoic diversity of birds (stem or crown).
https://t.co/79I0GYWKDF

[James Albert 🐟 🇺🇦 @JamesAl0410008]

New software for evolutionary trees: TreeFlow lets biologists test new ideas about how species evolve in a few lines of code, borrowing tools from AI research to do the hard math automatically. Months of programming become an afternoon. https://t.co/d0GSGDhS8E

[Journal of Applied Ecology @JAppliedEcology]

📖 New research📖

This study demonstrates that the commonness and red-list status of ecosystem types can be informative of biodiversity measures in terms of species richness at selected spatial scales ⛰️ 📈 🧪

👉️ https://t.co/KKurx6DuhW

[NeoMexicanismos @NeoMexicanismos]

No soy tan fuerte como lo pensaba 🥹 ::: por @ney.n3y #neomexicanismos

[Memes de Trabajo @shokeate]

Yo, de regreso del jale.

[Programa ONU Medio Ambiente @unep_espanol]

¿Quieres saber cuál es el estado de salud de un lago, río o acuífero cerca de ti?

Usa el Explorador de Ecosistemas de Agua Dulce, una plataforma de datos de los ecosistemas de agua dulce de la Tierra.

Más, en inglés y portugués: https://t.co/ScuBRGXHYu

https://t.co/nGDv1LhOnF

[@LuisValLe @LuisValLe_A]

Tenemos #Simulacro #AlertaSísmica!
¡CORRA, GRITE Y EMPUJE!

[Omi.🤙🏿 @OmarGarfitoGarf]

Las placas tectonicas moviéndose al ritmo de la #AlertaSísmica hoy en el #Simulacro

[Journal of Animal Ecology @AnimalEcology]

🌦️ Weathering the storm: Most maternal and environmental drivers of individual reproductive success do not scale up to population recruitment in a large herbivore🦘

📖 Read more here: https://t.co/qtXI6fB9Ou

[Biodiversidad de Guanajuato 🐸 @BioGuanajuato]

Seguramente los has visto corriendo por ahí, conoce a tus correcaminos :D

Info: @PepomintNarwhal

[Dr. Laura Bertola @LauraDBertola]

Phylogenomics and museomics reveal five distinct species of tiger cats in South America
https://t.co/aGhSLYTsKW

[Andrej Spiridonov @AndrejSpiridon4]

"We find three macroevolutionary transitions in mammal assemblages... regional Asianmid-Eocene aridification and...global events — the Paleocene-Eocene Thermal Maximum (...extreme warming 56Ma) and the Eocene-Oligocene Transition (prolonged cooling 34Ma)."
https://t.co/AtmIQMzj3V

[Fish in the News @FishInTheNews]

'Identification of the Cichlid Fishes of Lake Malawi/Nyasa Part 2: Pseudotropheina (the ‘mbuna’ sub-radiation)', the third and final part of George Turner's major work on Lake Malawi cichlids, is now published.

🔓 (preprint) - https://t.co/beyuCd3xlV

Presenting a detailed work on the identification, distribution, and taxonomy of Lake Malawi’s rock-dwelling mbuna cichlids, addressing one of the greatest difficulties in studying the lake’s estimated 900–1,000 cichlid species: reliable species identification.

Whilst presented as a work-in-progress, this study presents the most upto date information based on genomic data (much of which is so far unpublished) and traditional taxonomy based on morphology, colour and location. Not forgetting a few surprises!

𝗥𝗲𝘀𝗲𝗮𝗿𝗰𝗵 𝗧𝗶𝘁𝗹𝗲
Identification of the Cichlid Fishes of Lake Malawi/Nyasa Part 2: Pseudotropheina (the ‘mbuna’ sub-radiation)

𝗪𝗵𝗮𝘁 𝗶𝘀 𝗮 𝗣𝗿𝗲𝗽𝗿𝗶𝗻𝘁 𝗣𝘂𝗯𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻?
This article is a preprint and has not been certified by peer review.
https://t.co/V2rKfsN0kI

𝗖𝗶𝘁𝗮𝘁𝗶𝗼𝗻
George Francis Turner, Identification of the Cichlid Fishes of Lake Malawi/Nyasa Part 2: Pseudotropheina (the ‘mbuna’ sub-radiation). EcoEvoRxiv Preprint Server. DOI: https://t.co/rgfTlyy6pJ

𝗔𝗯𝘀𝘁𝗿𝗮𝗰𝘁
With an estimated 900-1000 species, the cichlid fishes of Lake Malawi represent the largest known adaptive radiation of vertebrates from a single common ancestor in a limited geographical area, in this case a single lake. They provide an outstanding opportunity to study the rapid diversification of form and function on a limited genetic background and to attempt understand why lineages vary so much in their propensity for diversification and how this may be influenced by their environment.

However, they present formidable difficulties in terms of the reconstruction of phylogenetic relationships, not only because of their low degree of genetic differentiation, exacerbated by issues of incomplete lineage sorting and introgression among non-sister taxa, but also because of the tremendous difficulties in species identification. This is likely partly a result of taxonomic neglect (at least half of plausible species remain undescribed) but also because of the tendency of species to attain a high degree of reproductive isolation on the basis of minimal morphological differentiation, often through divergence of signal systems including (but probably not limited to) differences in male courtship colours and display structure (bower) form. To this end, a major programme of genome sequencing is in progress, covering the entire radiation. However, a major challenge has been encountered in accurate identification of the specimens sampled. The present work reports on progress in the identification of these specimens, assessing evidence from examination of newly collected specimens and photographs in conjunction with studies of type material and literature.

Here, I focus on the subtribe Pseudotropheina (or Mbuna), of which 350+ known species are considered: this will probably prove to be a considerable underestimate. Many taxa within this group are tightly bound to patchily-distributed rocky habitats, leading to substantial within-lake geographic isolation. This is associated with sharp discontinuities in patterns of male breeding dress, which may merit recognition as narrowly-distributed endemic species or geographic colour variants, according to the model of species definition being applied. But, some populations with very similar phenotype appear to have evolved independently and may show assortative mating in laboratory trials, suggesting that they too should be regarded as distinct species.

It is intended that this work should be available as a free-standing pre-print which can be modified as further sequences are obtained, identifications are improved and species formally described.

© 2026. The copyright holder for this preprint is the author/funder, who has granted EcoEvoRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC 4.0 International license.
https://t.co/ECOE5ea8uy

#Mbuna #LakeMalawi #Ichthyology #Taxonomy #Biodiversity #AquariumHobby #Fishkeeping #Aquarist #TropicalFish #FishTank #RiftValleyCichlids #Cichlidae #Cichlids #Cichlid #Buntbarsch #Buntbarsche #Ciklid #Ciklider #Ciclidos #Cichlides #AfricanCichlids #Cichliformes #Labeotropheus

[@los_Indispensables @losIndispensab2]

Grito de Dolores

[PROFEPA @PROFEPA_Mx]

🌵 ¿Sabías que la biznaga burra pueden tardar hasta 200 años en alcanzar apenas un metro de altura? Por eso, el consumo del acitrón, obtenido de esta especie, pone en peligro de extinción a esta cactácea. ⚠️

🇲🇽 Disfruta estas fiestas patrias con responsabilidad ambiental, evitando usar acitrón en tus platillos mexicanos.

Si sabes de su comercio o extracción, denuncia por nuestras vías oficiales:
📞 800 776 3372
📧 [email protected]
🌐 https://t.co/50oiPltJ1U