MEXICO CITY &

Lorenzo Martinez, an illegal immigrant who has lived in Los Angeles for six years, has a message for his kin in Mexico's Hidalgo state: Stay put.




The steady construction work that had allowed him to send home as much as $1,000 a month in recent years had disappeared. The 36-year-old father of four said desperation was growing among the day laborers with whom he was competing for odd jobs.




Sporadic employment isn't the half of it. Martinez said anxiety also was running high among undocumented workers about stepped-up workplace raids, deportations and increasing demands by U.S. employers for proof that they were in the country legally.




"Better not to come," Martinez said of anyone thinking about crossing into the U.S. illegally. "The situation is really bad."




That message seems to be getting through. There are numerous signs of a slowdown in illegal immigration.




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A recent survey by Mexican authorities shows that fewer Mexicans say they are planning to seek work outside the country. In the third quarter of 2007, about 47,000 said they'd be packing their bags. That's down nearly one-third from the same quarter a year earlier.




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U.S. border authorities arrested just under 877,000 illegal crossers in fiscal 2007, which ended in September, down 20 percent compared to the year before. A drop in apprehensions is often interpreted as a sign that fewer migrants are attempting the trip.




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The growth rate of the U.S. Mexican-born population has dropped by nearly half to 4.2 percent in 2007 from about 8 percent in 2005 and 2006, according to an analysis of census data by the Pew Hispanic Center.




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Employment of foreign-born Hispanicsincreased at a slower pace in the first quarter of 2007 than during the same period in the previous three years, according to Pew. The slowdown was particularly noticeable in the construction industry. Growth in employment of foreign-born Hispanics in that sector was 10.9 percent early this year, compared to an average first-quarter growth rate of 19.8 percent from 2004 to 2006.




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The growth in remittances sent to Mexico has dwindled to a trickle. Through October of this year, Mexicans living abroad sent $20.4 billion home to their families, a 1.3 percent increase over the same period in 2006, according to Mexico's central bank. Those sums were growing in excess of 20 percent annually just a few years ago.




What's behind the apparent decline?




Some say it's primarily the slump in U.S. construction, which has been a magnet for undocumented workers over the last few years &

one in five Hispanic immigrants works in the building trades. Others say it's largely the result of stepped-up enforcement.




Proponents of tighter security say U.S. workplace dragnets and increased deportations have made big headlines in Latin America, deterring some would-be migrants. American authorities are installing hundreds of miles of new fencing along the southern border. About 15,000 U.S. Border Patrol agents have been deployed to the region, 25 percent more than in 2006. the end of next year, 3,000 more are slated to be in place.




"It's a combination of (more) personnel, technology and infrastructure," said Ramon Rivera, a spokesman for the Customs and Border Protection agency, of the falling arrest totals.




Immigration experts say tougher enforcement is one of several explanations. The border buildup has encouraged more illegal immigrants to employ professional smugglers, whose success rate is higher than that of individuals, said Wayne Cornelius, director of the Center for Comparative Immigration Studies at the University of California, San Diego.




He said tougher enforcement had also discouraged many undocumented workers from returning to their homelands for occasional visits for fear of getting caught re-entering the U.S. Fewer people coming and going across the border means fewer apprehensions.




The fall in arrests also fits a familiar pattern, one that traditionally has more to do with the strength of the U.S. job market than with walls or guards.




"It's the economy, stupid," Cornelius said.




Demographer Jeffrey Passel said the U.S. unemployment rate was the strongest correlating factor he had found in tracking migratory flows. In November, the jobless rate for Hispanics was 5.7 percent, up from 5 percent in November 2006.




"When it's easy to get a job, they come. When it's hard to get a job, they don't," said Passel, senior research associate at the Washington-based Pew Hispanic Center.




Border authorities apprehended a record 1.7 million would-be migrants in 2000, the height of the technology boom. That number tumbled over the next three years as the U.S. was rocked by recession, the Sept. 11 attacks and the loss of more than 2 million jobs. About 932,000 illegal crossers were apprehended in 2003, a 44 percent drop from 2000, according to Customs and Border Protection.




At the time, some credited the decline to tightened border security in the wake of Sept. 11. But arrests rebounded strongly in 2004 and 2005 as foreign-born workers flocked to the United States to fill jobs in the building trades.




As the bust in the U.S. housing market eliminates construction jobs, Mexico's economy is proving resilient, giving Mexicans added incentive to stay home. Job creation has been solid over the last two years, with nearly 2 million positions added in the formal economy. Although most jobs in Mexico pay a fraction of what they would in the United States, some Mexicans may be deciding that poorly paid work is better than none, given the uncertainty over the border.




At the same time, Customs and Border Protection has expanded efforts to jail some illegal border crossers for up to 180 days before deporting them. Some American communities have passed laws to deny services to undocumented residents. In fiscal 2007, Immigration and Customs Enforcement arrested more than 30,000 criminal aliens and immigration fugitives, including 1,300 illegal immigrants netted in a fall dragnet in the Los Angeles area.




Ira Mehlman, media director for the Washington-based Federation for American Immigration Reform, said the slowing U.S. economy and construction slump are undoubtedly important factors in dip in illegal immigration. But he said the stepped-up enforcement is "changing the mindset" of would-be migrants and the estimated 12 million undocumented immigrants already in the United States.




"Illegal immigrants are rational people," Mehlman said. "They will change their behavior."




Heightened security has rattled Roberto Guzman. Border patrol agents recently busted the 17-year-old on his first attempt to cross the Arizona border. The teenager said he was quickly deported back to Mexico, but that his brother and uncle were jailed.




Reached by phone at a shelter in the northern Mexican city of Nogales, Guzman said he planned to hang around a day or two in hopes his relatives would turn up. Either way, the farm boy said he plans to return to rural Zacatecas state in central Mexico.




"Maybe some other year," he replied when asked if he would try again.




But Higinio Gonzalez, 34, isn't as easily discouraged. Since 2004, he has been working in Sacramento, Calif., pulling weeds and hanging drywall, and has returned home once a year visit his family in central Mexico.




In the past, the illegal immigrant has had little trouble slipping back into the United States. Until now. Returning from his mother's funeral in Guanajuato state, Gonzalez has been nabbed twice by U.S. agents at the California border in recent days and deposited him back on the Mexican side.




"There's a lot of surveillance. I've never seen so much of it," he said by telephone from Tijuana.




With three children and wife to feed, he'll wait as long as it takes to get back to Sacramento. He has been weeks without a paycheck.




"I've got to get back to work," he said. "It's difficult to cross, but it's not impossible. And I'm going to make it."




Times staff writer Cecilia Sanchez contributed to this report.