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busqueme un estudio que senale la relacion entre cetaceos e hipos anterior a 1992 y hablamos....
busqueme un estudio que senale la relacion entre cetaceos e hipos anterior a 1992 y hablamos....
Vino Tinto;n3150886 dijo:Listo.. aquí esta el kit de la cuestión...
http://acp.eugraph.com/elephetc/hippo.html
Ornithologist William Barklow, of Framingham State College in Massachusetts, got a shock while observing a river full of hippopotamuses in 1987. Barklow normally studies loons, and he intended the Africa trip as a vacation. It turned out to introduce him to a new research direction. Barklow was sitting near the bank of a river when a hippo emerged from the water and stared silently for a few moments. Suddenly it let out a bellow that echoed off the river’s banks and shook Barklow, both figuratively and literally. He could actually feel the sound. Hippos can achieve 115 decibels, well into the range of loud, close thunder. Several times during the afternoon he heard a hippo bellow and noticed a curious phenomenon. Distant hippos would surface and bellow back. Had they heard the sound underwater? Could they also vocalize under water?
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Yet Barklow also recorded sounds with an underwater microphone. And he could watch as other hippos surfaced immediately after he heard both the above- and below-water sounds.
Back in his lab again, Barklow analyzed the recordings he had made. The results both intrigued and frustrated him. Computer analysis showed the sounds he’d recorded to be much more complex than he’d at first supposed. This hinted that hippos may have a complex communication system. And he found traces of overtones—like those seen in sonograms of elephant calls—indicating the presence of infrasound in the calls. Not expecting infrasound, Barklow hadn’t brought equipment capable of recording such low frequencies.
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y note lo siguiente
But in general, this system is so inefficient and diffuse it’s unlikely to support a complex underwater communication system like the one Barklow had observed. Barklow got a hint from dolphin researchers, who propose that the peculiar jaws of these marine mammals conducts sound clearly and efficiently to the middle ear. Could hippos hear in a similar way?
Studying hippo jaw and ear anatomy convinced Barklow that jaw hearing might work in hippos as well.
Entienda el punto... LOS SONIDOS FUERON DESCUBIERTOS y a partir de ese descubrimiento fue que se pusieron a ver como unían a los cetáceos on los hipos.... pues antes NO LOS COLOCABAN EN LA MISMA RELACION FILOGENETICA. ... al punto de que el tal BArklow, se guió por que recordó lo que los investigadores de los delfines estaban proponiendo... ANTERIORMENTE A ESE DESCUBRIMIENTO NO HAB´IAN RELACIONADO SIMILARIDAD ENTRE CETACEOS E HIPOS.
Espero hombre, que abra un tanto la mente y asimile críticamente lo que le estoy escribiendo. ...