Radiocaesium transfer and radiation exposure of frogs in Fukushima Prefecture

The International Commission on Radiological Protection has proposed an environmental assessment framework. This includes ionising radiation exposure assessment for different frog life-stages, but radiocaesium transfer parameters are unavailable. We collate data from the Fukushima Prefecture (contaminated by the Fukushima accident) and estimate radiocaesium concentration ratio (CR ) values for tadpoles and adult frogs, presenting the largest available amphibian CR dataset. In total, 513 adult frogs and 2540 tadpoles were analysed in 62 and 59 composite samples respectively. Results suggest that equilibrium was reached between water and amphibian radiocaesium activity concentrations circa one-year after the accident. Radiocaesium transfer to tadpoles was higher than to adult frogs. Dose rates were estimated for different life-stages and species in both the aquatic and terrestrial environment. Estimated dose rates to adults and tadpoles were typically similar because external exposure dominated for both organisms; frogspawn dose rates were estimated to be orders of magnitude lower than other life-stages. For the two sites assessed, which were outside of the most contaminated areas of the Fukushima Prefecture, estimated dose rates were below those anticipated to present a risk to wildlife populations; it is likely that dose rates in more contaminated areas were in excess of some effects benchmark values

Os impactos da alteração da contribuição previdenciária patronal para a indústria

Por variadas razões, a indústria brasileira vem perdendo competitividade interna e externa. Lançado recentemente, o programa Brasil Maior contempla, entre outras ações, a alteração da incidência da contribuição previdenciária patronal de alguns setores, que deixa de incidir sobre a folha de pagamento e passa para a receita bruta (MP 540/2011). Este artigo estimou os efeitos desta mudança, considerando uma elevação de 20% nas alíquotas da COFINS para se manter a neutralidade arrecadatória. Os resultados sugerem que não haverá grandes consequências macroeconômicas, embora o setor industrial apresente forte crescimento do produto e emprego, com pequenas reduções para a agricultura e serviços

Sustainable Social Security: Four Options

This paper presents four policy options to make Social Security sustainable under the coming demographic shift: 1) increase payroll taxes by 6 percentage points, 2) reduce the replacement rates of the benefit formula by one-third, 3) raise the normal retirement age from sixty-six to seventy-three, or 4) means-test the benefits and reduce them one-to-one with income. While all four policies achieve the same goal, their economic outcomes differ significantly. Options 2 and 3 encourage own savings, and capital stock is more than 10 percent higher than in the other two options. The payroll tax increase in option 1 discourages work effort, but means-testing the benefits as outlined in option 4 yields the worst labor disincentives, especially among the elderly

Effects of Terrestrial Buffer Zones on Amphibians on Golf Courses

A major cause of amphibian declines worldwide is habitat destruction or alteration. Public green spaces, such as golf courses and parks, could serve as safe havens to curb the effects of habitat loss if managed in ways to bolster local amphibian communities. We reared larval Blanchard's cricket frogs (Acris blanchardi) and green frogs (Rana clamitans) in golf course ponds with and without 1 m terrestrial buffer zones, and released marked cricket frog metamorphs at the golf course ponds they were reared in. Larval survival of both species was affected by the presence of a buffer zone, with increased survival for cricket frogs and decreased survival for green frogs when reared in ponds with buffer zones. No marked cricket frog juveniles were recovered at any golf course pond in the following year, suggesting that most animals died or migrated. In a separate study, we released cricket frogs in a terrestrial pen and allowed them to choose between mown and unmown grass. Cricket frogs had a greater probability of using unmown versus mown grass. Our results suggest that incorporating buffer zones around ponds can offer suitable habitat for some amphibian species and can improve the quality of the aquatic environment for some sensitive local amphibians