NEW YORK ( Trefis) -- Here are this week's ETF winners and losers.

Winners

Guggenheim Airline ETF (FAA) 5.2%

The transportation sector remains an interesting corner of the market to watch. Despite concerns about the detrimental impact of rising fuel prices, companies responsible for moving people and goods from place to place have enjoyed notable stability.

Airlines, in particular, have enjoyed strength, scoring FAA a spot among the week's winners for the second week in a row. A combination of oil's weakness throughout this week and a bout of strong earnings has helped provide this sector with some lift.

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iPath S&P 500 VIX Short Term Futures ETN (VXX) 7.1%

The VIX-based ETNs managed to stage a comeback over the past week as sweeping commodity weakness and other factors rekindled investor fears.

As evidenced by the April flow report issued by the National Stock Exchange, VXX has become a popular product among investors. During the past month, the fund witnessed asset inflows totaling $400 million.

I urge conservative, long-term investors to continue to avoid this fund and other VIX-related products. While exciting to watch, these funds have seen rampant volatility on a number of occasions.

iShares Barclays 20+ Year Treasury Bond Fund (TLT) 1.7%

Market jitters sent investors pouring into long-term Treasuries last week. In response, TLT managed to power higher, breaking through its 50-day moving average. With the past week's gains, the fund has returned to levels last seen at the start of December 2010.

TLT remains an attractive option for conservative investors looking to defend against market turmoil. It will be interesting to see whether the fund can maintain its current strength in the days and weeks ahead.

Losers

iShares Silver Trust ( SLV) -26.6%

The physically based SLV stood out as the biggest ETF loser this week, as sellers put an end to the precious metal's dramatic multimonth ascension.

Silver was not alone in the dip, however. Fellow shiny resources including gold and palladium also witnessed declines, leading iShares Gold Trust ( IAU) and ETFS Physical Palladium Shares ( PALL) to losses.

In the days ahead, silver and other resources will likely be in the spotlight and may continue to prove volatile.

United States Oil Fund (USO) -14.0%

Oil was not left out of this week's sweeping commodity downturn. As crude prices dipped below $100 per barrel, the futures-based USO broke lower and pierced its 50-day moving average for the first time since late February.

Fellow energy futures fund, United States Natural Gas Fund ( UNG) ran into turmoil this week as well. The fund is currently volleying between its 200- and 50-day moving averages.

Like precious metals, energy will likely be closely watched in the week ahead. Investors looking to track oil and natural gas, however, should steer clear of USO and UNG. Equity-backed options such as iShares Dow Jones U.S. Oil Equipment & Services Index Fund ( IEZ) and First Trust ISE Revere Natural Gas Index Fund ( FCG) will likely prove to be more reliable options.

Market Vectors Russia ETF (RSX) -7.6%

Slipping crude prices put heavy pressure on energy-reliant international ETFs like RSX. This fund, designed to track the largest and most liquid components of the Russian marketplace, is headlined by oil and gas goliaths including Gazprom, Lukoil and Rosneft.

Canada was another nation that struggled this week in light of the commodities downturn. The iShares Dow Jones Canada Index Fund ( EWC) boasts heavy reliance on the energy and materials sector.
At the time of publication, Dion Money Management owned IAU and EWC.

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