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CHICAGO Khris Middleton Womens Jersey , Sept. 7 (Xinhua) -- Changing climate on the Earth may cause extinction of up to one-third of parasite species by 2070, according to a new study published in the journal Science Advances on September 6.

The diverse group of organisms or parasites includes tapeworms, roundworms, ticks, lice, fleas and other pests. Parasites have a bad reputation for causing disease in humans, livestock and other animals. But parasites play important roles in ecosystems, and parasite loss could dramatically disrupt ecosystems.

To find out how climate change is likely to affect the survival of a wide range of parasite species, researchers turned to museum collections. The U.S. National Parasite Collection, containing millions of organisms, provides a broad and deep record of different species' occurrences around the world. Most species are represented by many specimens, meaning researchers can use the museum's records to investigate organisms' geographical distributions and predict changes over time.

Records from the U.S. National Parasite Collection were combined with additional information from specialized databases cataloging ticks, fleas, feather mites and bee mites to enable a comprehensive global analysis.

Then a team including 17 researchers in eight countries spent years tracking down the exact geographical source of tens of thousands of parasite specimens, adding GPS coordinates to their database wherever possible.

Using climate forecasts, the researchers compared how 457 parasite species will be impacted by changes in climate under various scenarios.

The analysis determined that parasites are even more threatened than the animal hosts they rely on. The most catastrophic model predicted that more than a third of parasite species worldwide could be lost by 2070. The most optimistic models predicted a loss of about 10 percent.

""(Slowing climate change) has a really profound impact on extinction rates, ""said study lead author Colin Carlson, a graduate student in Wayne Getz's laboratory at the University of California, Berkeley.

""Parasites are definitely going to face major extinction risk in the next 50 years,"" Carlson said. ""They are certainly as threatened as any other animal group.""

""Climate change has the capacity to alter nearly every dimension of biodiversity,"" said Nyeema Harris, an assistant professor in the Department of Ecology and Evolutionary Biology of the University of Michigan (UM).

It is the consensus of the researchers that parasites need to be included in conversations about conservation, given their delicate position in complex ecosystems as the study shows.

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BEIJING, Sept. 8 (Xinhua) -- The central parity rate of the Chinese currency, the yuan, strengthened for the tenth consecutive working day to a nearly 16-month high against the U.S. dollar Friday.

The central parity rate of the yuan strengthened 237 basis points to 6.5032 against the U.S. dollar, its strongest level since May 2016, according to the China Foreign Exchange Trade System.

The adjustment came after a rise of 42 basis points Thursday and 59 basis points Wednesday. The rate fell below 6.6 last Friday, the first time since June last year.

In China's spot foreign exchange market, the yuan is allowed to rise or fall by 2 percent from the central parity rate each trading day.

The central parity rate of the yuan against the U.S. dollar is based on a weighted average of prices offered by market makers before the opening of the interbank market each business day.

The yuan has appreciated by 6 percent in cumulative terms against the dollar since the beginning of the year.

The dollar index against a basket of six major currencies was down 0.5 percent at 91.21 Friday as long-dated Treasury yields fell to 10-month lows.

Lingering concerns over tensions related to the Democratic People's Republic of Korea may limit the dollar's upside versus other major currencies, according to CITIC Securities.

Guan Tao, former head of the international payments department at the State Administration of Foreign Exchange, attributed the yuan's rise to China's solid economic fundamentals, stable cross-border capital flows and balanced supply-demand in the forex market.

China's economy expanded 6.9 percent in the first half, well above the target of around 6.5 percent for the year.

Its manufacturing activity expanded for the 13th consecutive month in August, providing fresh evidence of a firming economy.

China's forex reserves rose for the 7th month in a row in August to 3.092 trillion U.S. dollars, increasing 10.8 billion dollars from a month earlier.

""So far, the aim to keep the yuan exchange rate basically stable at a reasonable and balanced level has reached better-than-expected success,"" Guan said.

While recent weakness of the U.S. dollar and market sentiment have strengthened the yuan, UBS economist Wang Tao does not see the yuan embarking on a multi-year appreciation path.

""We expect the dollar and the yuan to be range bound for the remainder of the year, trading at 6.5-6.6 at the end of the year,"" Wang said in a research note.

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