NEW YORK — Some shoppers are fretting about big companies they don’t like taking over their favorite brands.

The latest: Amazon’s move to purchase Whole Foods has spurred worries about a decline in quality and ethical standards, or that the store will become like other supermarkets. Wal-Mart’s purchase of clothing labels ModCloth and Bonobos has some shoppers anxious that the world’s largest retailer will cheapen the quality of the clothes, or they’re vowing not to buy the brand again because they don’t want to support Wal-Mart.

The challenge for Wal-Mart is to expand the reach of Bonobos without alienating many of its core customers. Associated Press/Bebeto Matthews

For big companies, the challenge is always expanding the reach of a beloved niche brand without alienating its core customers. Of the recent deals, that’s a bigger job for Wal-Mart, since its reputation is more about low prices than trendy fashion – and shoppers might not view the world’s largest retailer very positively.

“Bye bye Bonobos,” T.D. Arkenberg wrote on Twitter. “I’ll miss you. You were a great brand. But as Sears destroyed Lands’ End, Wal-Mart will destroy Bonobos!”

Arkenberg, of Arlington Heights, Illinois, has five pairs of Bonobos pants and loves the way they fit. He planned to buy more, but now says he’ll shop more at Nordstrom and other small boutiques. Arkenberg believes Wal-Mart puts cost-cutting ahead of workers.

“In my mind, Wal-Mart’s participation of the brand will cheapen it,” he said in an interview.

Retail history is full of big companies taking over smaller labels, with mixed results. Cosmetic giant Estee Lauder kept the irreverent spirit of MAC Cosmetics when it bought the remaining stake of the upstart makeup brand in 1998. And when Marriott International purchased the swank Ritz-Carlton chain that same year, it found success because it took a hands-off approach, said Allen Adamson, founder of the firm BrandSimpleConsulting.

But plenty of cases didn’t turn out so well, as Arkenberg noted. Sears Holdings Corp. purchased sporty outdoor chain Lands’ End in 2002, but sales deteriorated before Sears spun it back off in 2014. Cereal giant Kellogg Co. bought Kashi in 2000 as it sought to get into the organic food market. But sales of Kashi tumbled after Kellogg stopped letting Kashi run its business independently.

“There is a level of distrust among big institutions,” said Wendy Liebmann, CEO of consulting firm WSL Strategic Retail. “So there’s a very delicate balance for big companies to continue to support (the label) and let it grow, and taking costs out of it to make it more efficient.”

Joan Walsh, a Whole Foods customer from Seattle, is concerned that Amazon could ruin the shopping experience at her favorite store.

“I really like Whole Foods for its quality, customer service, and also its proximity to my home and the fact they have all-natural ingredients, non-GMO products,” said Walsh. “I just worry that Amazon will really degrade the kind of customer service and quality I’m accustomed to.”

Neither Amazon nor Whole Foods has said much about what they plan. They have said, though, that they don’t intend to change Whole Foods’ standards, which include a ban on artificial ingredients. And Wal-Mart says it’s keeping the stable of online brands it’s bought up, including ModCloth and Bonobos, independent. It says they won’t be sold in Wal-Mart stores – only through Jet.com, which Wal-Mart acquired last year.

Andy Dunn, co-founder and CEO of Bonobos, said that when news of the possible deal leaked two months ago, it gave him a chance to test the reaction. And he found that customer growth actually accelerated.

But Dunn concedes there’s work to be done in appeasing what he calls a dissatisfied minority who are loud on social media. He says some shoppers don’t understand that Wal-Mart is a different company than it was in the past, and he plans to be a “mouthpiece” to trumpet the company’s moves to increase pay for workers and its environmental efforts.

Whole Foods’ most loyal shoppers were fairly negative about the Amazon deal, with almost 43 percent saying they thought it was a bad idea, according to a survey of more than 2,000 shoppers conducted by research firm GlobalData Retail after the purchase was announced. Most of the concerns centered around a possible change in food quality or the company’s ethical standards, the report said, and just over half fear the deal might mean Whole Foods becomes like “any other grocer.”

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