Ponds, lakes, rivers and streams cover only a tiny fraction of Earth's surface, yet they are home to a comparatively large number of different species, according to a study led by University of Arizona ecologists While much research has focused on the striking differences in biodiversity between tropical and temperate regions, another, equally dramatic, pattern has gone largely unstudied: the differences in species richness among Earth's three major habitat types – land, oceans and freshwater. A new study led by ecologists at the University of Arizona reveals the origins of diverse animal and plant species richness in terrestrial, ocean and freshwater habitats at a global scale. It also explores the possible causes of these richness patterns. One of the world's longest rivers, th...
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