#cienciacriolla

[arrecifescoralinos]

Chromatophores

Chromatophores | Squid

Just beneath the surface of this squid’s skin are thousands of color-changing cells called chromatophores. 🎥🦑 by SaltyFlyTying.com #SharkW

Did you remember the last time I showed you the squids and their relationships with bacteria por bioluminescence?

Now look at this amazing chromatophores

The squids and octopuses have this specific cells in their skin, and use them for camouflage! They can change color easily and mimet the environment! So they can ‘desapear’ to our eyes, or their preys or predators changing the chromatophore’s colors.

Just look at this color and size incredible change in the video!

🦑 🐙

———

Recuerda la última vez que le a mostré la asociación simbiótica que tienen algunas calamares con bacterias que ayudan a su bioluminiscencia?

Ahora miren este increíble cambio de color gracias al uso de células especializadas llamadas cromatóforos! Con esta ayuda, los pulpos y calamares pueden cambiar de color y camuflarse perfectamente en el ambiente para esconderse ante los ojos de predadores y presas.

Miren el vídeo arriba!

#squids #camouflage #cromo

[arrecifescoralinos]

Steady Decline of Corals and Other Benthic Organisms in the SeaFlower Biosphere Reserve (Southwestern Caribbean)

Coral reef decline persists as a global issue with ties to climate change and human footprint. The SeaFlower Biosphere reserve includes some of the most isolated oceanic coral reefs in the Southwestern Caribbean, which provide natural experiments to test global and/or basin-wide factors affecting coral reefs. In this study, we compared coral and other substrate cover (algae, cyanobacteria, and octocorals), along population densities of keystone urchin species from two atolls (Serrana and Roncador Banks), during 1995, 2003, and 2015/2016. We also surveyed benthic foraminifera as a water quality proxy for coral growth in the last period. A steady reduction in coral cover was clearly observed at Roncador’s lagoon, but not at Serrana’s reefs, with significant differences between 1995 and 2015/2016. Percent cover of fleshy algae decreased significantly also at Roncador between 1995 and 2003 but did not change notably from 1995 to 2016 at Serrana. However, both Banks exhibited a loss in crustose coralline algae from 2003 to 2015/2016. Likewise, a reduction in bottom complexity, measured as bottom rugosity, was evident between 1995 and 2003. Roncador Bank had unprecedented high octocoral densities, which increased almost threefold from 2003 to 2015. In contrast, urchin densities were low in Roncador; only Diadema antillarum increased from 2003 to 2016 in Serrana Bank. The Foraminifera in Reef Assessment and Monitoring (FORAM) Index (FI) in the two Banks was below the range expect...

Our very interesting paper in *Frontiers in Marine Science* explaining the coral reef ecosystem evolution, changing from hard corals to ecosystems full of algae and abundant octocorals.

[arrecifescoralinos]

Local confinement of disease-related microbiome facilitates recovery of gorgonian sea fans from necrotic-patch disease

Article

Microbiome in gorgonian sea fans.

[mafrecitarockera]

... Lo positivo de esta historia es la gran cantidad de investigadores que participaron #cienciacriolla #egoteca #aves #UICN http://m.eltiempo.com/vida/medio-ambiente/especies-de-aves-colombianas-en-peligro-de-extincion-145680