Interior Secretary Ken Salazar will retire from his post at the end of March, ending a four-year stint in President Obama’s cabinet and becoming its sixth member to depart it this year. Mr. Salazar made his mark at Point Reyes National Seashore when he chose to close Drakes Bay Oyster Company last November; he is now part of a lawsuit brought by the oyster company against him and his chief of the National Park Service, Jon Jarvis, alleging they violated the National Environmental Policy Act and other laws. In a press release sent yesterday, Mr. Salazar said he had “implemented community-driven, science-based conservation strategies that take into account entire ecosystems and working landscapes.” “From the Crown of the Continent in Montana to the prairie grasslands of Kansas to the Everglades Headwaters in Florida, we are partnering with landowners, farmers, and ranchers to preserve their way of life and the irreplaceable land and wildlife that together we cherish,” he said, adding that he is looking forward to returning to his family and his home state of Colorado.