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Aug
6
2009
Some related species share high extinction risk
Osta viagra online, Why do certain species peter out, while others keep going strong. Georgia GA Ga., It turns out that some branches of the evolutionary tree are more vulnerable to extinction, researchers report in Science.
The authors studied fossil records of oysters, buy viagra in toronto, Cheap viagra online org levitra, scallops, and other marine bivalves from the past 200 million years and found that extinctions tend to cluster within families of related species, viagra for sale in ireland. Viagra discount prices, Three families with high extinction rates vanished entirely at the end of the Cretaceous, leaving more resilient families behind, herbal viagra free trial. Lowcostviagra, And related families had similar extinction levels, suggesting that the effect occurred both within and among families.
The findings imply that a species’ chances of survival depend partly on its lineage, for mye viagra, Ver fotos de viagra de que color es como es, the authors say. If the clustering pattern holds true for other species, viagra cheap prices, Trusted viagra online, then future extinctions are more likely to wipe out large branches of the evolutionary tree – and shared traits that evolved over millions of years – rather than individual “twigs” here and there, says co-author Kaustuv Roy at the University of California, can you buy viagra without a prescription, Forums viagra, San Diego. – Roberta Kwok
Source: Roy, K., G, Osta viagra online. Hunt, buy viagra by mobile text, Cialis viagra, and D. Jablonski. 2009. Phylogenetic conservatism of extinctions in marine bivalves. Science DOI: 10.1126/science.1173073.
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