A gavel and a bigger staff are not all that come with the job as chairman of a House committee. As is widely known, it almost certainly translates into a surge in donations to campaign accounts, as corporations and lobbyists whose business affairs are regulated by the committee attempt to make nice with the new bosses.

A study released on Wednesday documents just how extraordinary this jump in contributions can be, for both Democrats and Republicans, who serve as committee chairman or the ranking minority member.

The report by Citizens for Responsibility and Ethics in Washington examined 10 important House committees — including Financial Services, Energy and Commerce, Natural Resources, Armed Services and Agriculture. The study compared how much the two most senior members of these committees raised in campaign contributions in the 1998 election cycle, before they were leaders, with their fund-raising totals in 2010, when they were either already the chairman or ranking member — or about to take over one of those jobs.

The numbers are impressive.

Since 1998, Representative Spencer Bachus, Republican of Alabama, now chairman of the House Financial Services Committee, has seen contributions from the financial industry jump 620 percent, while his contributions from all sources have increased by 234 percent, the report says.

The result is that nearly two thirds of all his money during the 2010 election cycle came from industries regulated by his committee, which he has chaired since the start of this year after serving as the ranking Republican since 2007.

Representative Collin C. Peterson, Democrat of Minnesota, who is now the ranking Democrat on the Agriculture Committee after serving as chairman between 2007 and 2010, saw a 711 percent increase in contributions from groups regulated by his committee, and a 274 percent increase in contributions over all, in the same period.

Of the 20 members studied, contributions from regulated industries rose nearly three times faster than their fund-raising totals, according to the study, which relied on data of contributions by industry as compiled by the Center for Responsive Politics and voting data complied by MapLight.org.

The report counted $8.9 million worth of donations to the current chairmen or ranking minority members during the 2010 election cycle.

“They all try to suggest their fund-rising is not tied to the industries they regulate, but this shows that it is,” said Melanie Sloan, executive director of Citizens for Responsibility and Ethics in Washington, a nonprofit group funded mostly by left-leaning organizations. “People who are giving you that much money — it is not out of the goodness of their hearts — clearly they want something.”

The study also looked at the voting record of the committee chairmen and ranking minority leaders, to examine if they were more likely than other members of their own party to favor the industry they regulated on major legislation.

The results were not that conclusive.

For the first nine months of this year, 11 of the chairmen or ranking members were more likely than other members of their party to vote in an industry friendly way, while nine others were not, the study showed.

Some committee chairmen have been particularly loyal to the industry the regulate, like Representative Buck McKeon, Republican of California, who has voted in agreement with the industry 100 percent of the time this year. That compares with 88 percent industry support for the average Republican, the study found.