File:Heterocephalus glaber (6507324251).jpg
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Summary
[edit]DescriptionHeterocephalus glaber (6507324251).jpg |
Aquí podemos ver una apacible imagen de un clan de ratas topo desnudas, en el Faunia de Madrid. Estas maravillas mamiferianas son el único ejemplo de eusocialidad conocido en mamíferos. Llamamos eusocialidad a la forma de vida social en la que se da : 1) Superposición y convivencia de generaciones (madres e hijos permanecen juntos toda la vida) 2) División de la sociedad en castas (reproductora y estériles) 3) Cuidado de la descendencia cooperativo. En el caso de las hormigas, la hipótesis más fuerte del origen de esta conducta está en la particularidades cromosómicas de la especie (todos los espermatozoides de los machos son idénticos y la reina se reproduce una sola vez en su vida, almacenando los espermatozoides; por lo que todas sus hijas reciben el mismo espermatozoide paterno y comparten 3/4 del genoma. Si tuviesen sus propios hijos compartirían sólo 1/2 con ellos, por lo que es evolutivamente mejor que asistan a su madre para que les de más hermanas). En la rata topo desnuda, todo está menos estudiado, pero parece que la hembra logra la alta tasa de parentesco entre hermanas mediante la endogamia prolongada (sin comprometer la viabilidad, como nuestros reyes humanos :) ) y la esterilidad de sus hijas mediante una sustancia inhibidora de su maduración sexual que libera en su orina. Además se ha observado a reinas golpeando y mordiendo a sus hijas de forma ritualizada, lo que también podría estar relacionado con la eusocialidad. Si les interesa el tema de la eusocialidad, les recomiendo que lean, a modo de iniciación: "La hormiga y el sociobiólogo" de Pierre Jaisson. |
Date | |
Source | Heterocephalus glaber |
Author | Javier Ábalos from Valencia, España |
Camera location | 40° 23′ 32.77″ N, 3° 36′ 44.94″ W | View this and other nearby images on: OpenStreetMap | 40.392437; -3.612484 |
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Licensing
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This image was originally posted to Flickr by Javier Ábalos at https://flickr.com/photos/34133362@N00/6507324251. It was reviewed on 2 September 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-sa-2.0. |
2 September 2020
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 23:50, 2 September 2020 | 3,264 × 1,840 (2.84 MB) | RTG (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | Panasonic |
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Camera model | DMC-FZ18 |
Exposure time | 1/40 sec (0.025) |
F-number | f/3.2 |
ISO speed rating | 400 |
Date and time of data generation | 13:51, 5 January 2007 |
Lens focal length | 13.6 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Ver.1.0 |
File change date and time | 13:51, 5 January 2007 |
Y and C positioning | Co-sited |
Exposure Program | Manual |
Exif version | 2.21 |
Date and time of digitizing | 13:51, 5 January 2007 |
Meaning of each component |
|
Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Cloudy weather |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Manual white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 90 mm |
Scene capture type | Standard |
Scene control | High gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |