Latest Species richness Stories

2012-01-26 13:47:58

Competition is at the root of diversity in rainforests Ecologists are still arguing about the nature of the factors that determine the species composition of ecological communities. On the one hand, there are those who view interspecies competition as the key element. A second group of influential ecologists postulates that random fluctuations in population structure and rates of species dispersal play the dominant role, particularly in the biological communities found in species-rich...

2011-04-09 04:18:23

A meta-analysis finds that as plot size increases, threat to biodiversity loss decreases The phrase "invasive plant species" typically evokes negative images such as broad swaths of kudzu smothered trees along the highway or purple loosestrife taking over wetlands and clogging waterways"”and as such, invasive plants are largely viewed as major threats to native biodiversity. However, research has shown both that invasive species may be one of the most important threats to biodiversity...

2010-12-21 08:22:45

It's long been accepted by biologists that environmental factors cause the diversity"”or number"”of species to increase before eventually leveling off. Some recent work, however, has suggested that species diversity continues instead of entering into a state of equilibrium. But new research on lizards in the Caribbean not only supports the original theory that finite space, limited food supplies, and competition for resources all work together to achieve equilibrium; it builds on...

2009-07-10 08:50:00

Ask biologists how many species live in a pond, a grassland, a mountain range or on the entire planet, and the answers get increasingly vague. Hence the wide range of estimates for the planet's biodiversity, predicted to be between 2 million and 50 million species.A new way of estimating species richness reported this month in the journal Ecology Letters by University of California, Berkeley, ecologist John Harte and colleagues, will make such estimates more precise for habitats of all sizes...

2007-06-17 03:04:55

By Novack-Gottshall, Philip M Abstract.- The process of evolution hinders our ability to make large-scale ecological comparisons-such as those encompassing marine biotas spanning the Phanerozoic-because the compared entities are taxonomically and morphologically dissimilar. One solution is to focus instead on life habits, which are repeatedly discovered by taxa because of convergence. Such an approach is applied to a comparison of the ecological diversity of Paleozoic (Cambrian- Devonian)...

2005-08-17 14:14:00

The first full map of where the world's birds live reveals their diversity 'hotspots' and will help to focus conservation efforts, according to research published in Nature today (18 August). The findings are drawn from the most complete and detailed picture of bird diversity yet made, based on a new global database of all living bird species. The map also shows that the pattern of bird diversity is much more complicated than previously thought. The researchers conclude that different...

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