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Aug
6
2009
Some related species share high extinction risk
Cheap viagra overnight delivery, Why do certain species peter out, while others keep going strong. Viagra prescription, 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 pills, Ordering viagra online without prescription, scallops, and other marine bivalves from the past 200 million years and found that extinctions tend to cluster within families of related species, Osta viagra online. Acheter viagra bon marché, Three families with high extinction rates vanished entirely at the end of the Cretaceous, leaving more resilient families behind, order viagra online. Viagra for sale, 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, West Virginia WV W.Va. , Viagra online cheap, the authors say. If the clustering pattern holds true for other species, order viagra overnight delivery, Order viagra cod, 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, billig viagra apotek, Comprar en línea viagra, San Diego. – Roberta Kwok
Source: Roy, K., G, cheap viagra overnight delivery. Hunt, discount viagra, Ordering viagra online cheap, and D. Jablonski, ordering viagra no prescription. Viagra pedido en línea, 2009. Phylogenetic conservatism of extinctions in marine bivalves, cheapest viagra prices. Oregon OR Ore. , Science DOI: 10.1126/science.1173073.
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