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Showing posts with label Atlantic. Show all posts
Showing posts with label Atlantic. Show all posts

Northern Australia Has a New Dolphin

There are many species of dolphin. To most people they look much alike. We know that they are very intelligent and like to be in the presence of Man, even if it is only following boats

A new species has been identified off northern Australia. It could have always been there or moved there from somewhere else. They are in the "hump" class, having a raised portion below the dorsal fin.

Scientists are treating the dolphin as a new species which makes three species of Indo-Pacific humpback. There are four kinds of humpback in total including the eastern Atlantic type, Sousa teuszil.
 
Apparently, naming of the "new" species is a complex process based on the previously used naming practice, behavior of the animal itself and its habitat.

Discovery of the northern Australian dolphin came about by the first intense study into the humpback genus. It involved examination of 180 skulls and 235 tissue samples.
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Evolution by Ty Buchanan
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Less Atractive Males Make do With Plainer Females

An audience affects the behavior of mating male fish. If a male Atlantic Molly (Poecilia mexicana) is left alone he will try to mate with the healthiest looking female - the best female in his eyes. If there are other males in the vicinity he will not choose this female.

It may be thought that he is giving up. This is not the case. He is thinking strategically. By choosing a less desirable female he leads other males away from the intended target best female. The male hopes to mate with this female later when the other rival males have gone.

Some males are just too ordinary and have to mate with lesser females because other fitter males stop them getting close to "ideal" females. Mating with any female is better than not mating at all.

This behavior could be present in humans. When a group of young men meet with a group of young females the handsomest men can be expected to pair off with the prettiest young ladies. The less attractive have to make do with second best. This means that some of the good genes carried by the plainer individuals can be passed on despite mating between the healthier, fitter thus better looking people being the norm.
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Society
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