First-quarter revenue shrunk at publicly held US job board operators.

At Monster Worldwide Inc. (NYSE: MWW), revenue fell 8.7% in the first quarter to $157.8 million; however, the decline was 7% when measured in constant currency.

“While results in our North America business in the first quarter were mixed, we have experienced improving trends in our European business for the third consecutive quarter,” said Tim Yates, who serves as Monster’s CEO and CFO.

Monster’s North American revenue fell 10.8% in the first quarter to $109.2 million, and international revenue fell 3.8% to $48.6 million.

Looking to CareerBuilder, parent company Tegna Inc. (NYSE: TGNA) reported first-quarter revenue was down 2.3%, or down 1.8% in constant currency. CareerBuilder is one business line for Tegna, which owns a 53% interest in the job board operator.

Tegna reports CareeBuilder results in its “digital” segment, which also includes results from the company’s other online properties Cars.com, G/O Digital and Cofactor. Digital revenue at Tegna rose 0.8% to $337.9 million in the first quarter.

First-quarter revenue also fell at DHI Group Inc. (NYSE: DHX). The company operates the Dice.com job board for IT professionals; eFinancialCareers; ClearanceJobs, Rigzone and more. Dice posted an 8.6% decline in total first-quarter revenue to $58.3 million.

One area of decline was DHI’s “global industry group” segment, where revenue fell 17% in the first quarter to $16.6 million. DHI reported in a filing with the US Securities and Exchange Commission that the decrease was primarily caused by a fall in business at Rigzone due to the tough energy market.

DHI’s sale of Slashdot Media, an operator of online technology communities, and Brightmatter, a Web development firm, also resulted another $3.1 million less in revenue.

However, the comapny reported revenue was flat in its “Tech and clearance” segment, which includes Dice.com, Dice Europe and ClearanceJobs. Healthcare revenue at DHI, which includes Health eCareers, rose 14% to $7.0 million in the first quarter.

Separately, LinkedIn (NYSE: LNKD) earlier reported its revenue rose 35.0% in the first quarter.