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Feb
10
2010
Predators lag prey in climate change adaptations
Viagra online, Organisms at different levels in the food chain are shifting their life cycle schedules at varying rates in response to global warming. Desarrollo viagra, The mismatch raises the possibility that ecosystem functions will be thrown out of whack, scientists warn.
To reach that conclusion, viagra online legally, Cheap ass viagra without prescription, researchers studied more than 25,000 recorded changes in 726 types of organisms in the United Kingdom, buy viagra munich, What stores find viagra, spanning habitats from land to freshwater systems to sea. The changes included shifts in events such as insect flights, viagra online santa fe capital, Viagra forsale, bird egg-laying, and plant flowering, viagra jacksonville. How long does viagra last, From 1976 to 2005, these events occurred an average of 0.39 days earlier each year, buy brand name viagra, Viagra websites for sale, advancing by a total of about 12 days.
But not every group of organisms responded the same way. Species higher in the food chain changed their life cycle schedules more slowly than species lower in the food chain, online viagra without prescription, Buy herbal viagra in houston texas, according to the study in Global Change Biology. Since interactions between predator and prey are critical for healthy ecosystems, the timing gap could disrupt pollination and other important events, the researchers say, viagra online. – Roberta Kwok
Source: Thackeray, how often can you take viagra, How much is viagra on the street, S.J. et al. 2010. Trophic level asynchrony in rates of phenological change for marine, freshwater and terrestrial environments. Global Change Biology. DOI: 10.1111/j.1365-2486.2010.02165.x.
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Mar
1
2007
Water hyacinth removal kills tropical reservoir, eight-year study shows
Righting wrongs can’t always be done in an instant, as a study published this week illustrates. Denise Bicudo, at the Instituto de Botânica, São Paulo, Brasil, and colleagues monitored the after-effects of operations to remove water hyacinths Eichhornia crassipes, which were choking the shallow Garças Reservoir. Removing the pesky plants, which at their peak covered 70 percent of the water’s surface, triggered explosions in cyanobacteria and phytoplankton. Coupled with changes in the acidity and nutrient levels of the water, the impact on the reservoir of these unwanted new blooms was devastating: according to the study’s authors it has moved into a “stable degraded state”. They mean it’s screwed.
Source: Bicudo DdC, Fonseca BM, Bini LM, Crossetti LO, Bicudo CEdM & Araújo T (2007) Undesirable side-effects of water hyacinth control in a shallow tropical reservoir. Freshwater Biology DOI: 10.1111/j.1365-2427.2007.01738.x
Image © Marianne Fitzgerald
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