At the mouth of the Carmel River, a teacher set up a spotting scope and let a boy look through it. The birds were the first thing he saw. The habit of looking came next. He saw that the world could be understood, though not quickly, and that its order did not reveal itself to those in a hurry. Later he would say he never recovered from that experience. The remark was light, but also true. A childhood near Monterey, with woods behind the house and the Pacific within walking distance, gave him the subject of his life. Robert “Bob” Ricklefs, who died on June 7th, a day after his 83rd birthday, spent that life asking how living things came to be where they are, and why they lived as they did. He became one of the most influential ecologists of his generation: an ornithologist, biogeographer, theorist, teacher, author and member of the National Academy of Sciences. His textbooks, Ecology and The Economy of Nature, shaped how thousands of students first encountered the field. Their authority came from clarity. He could take a tangled subject and find a usable path through it. Birds were his beginning. As a boy he joined weekend outings with the local Audubon Society and gained the status, modest but real, of a child with a serious interest. At Stanford he briefly followed the spirit of the space age into engineering, then returned to biology. At the University of Pennsylvania he entered the circle of Robert…This article was originally published on Mongabay

When invasive rats are removed from islands, the ecological benefits can ripple across both land and sea more quickly than scientists expected, according to recent research. Scientists have long assumed that meaningful recovery after the predators are eradicated would take decades. However, researchers with the U.S.-based NGO Island Conservation conducted a rat-removal experiment on Ulong Island in Palau, which provides the first experimental evidence that ecosystems can rebound far more quickly than previously expected. Until recently, rats, which are typically nocturnal, were so abundant on Ulong Island that they were regularly seen during the day. They were a nuisance to campers and deadly for wildlife. As opportunistic omnivores, rats readily prey upon seabird eggs and chicks, devastating nesting colonies on tropical islands. As a result, there were “very few nesting seabirds that we would find,” Coral Wolf, the conservation science program manager at Island Conservation, told Mongabay in a video call. To measure the effects of rat eradication, Wolf designed an experiment in which all the rats were removed from Ulong, while the rats on nearby Ngeruktabel Island remained, serving as a control site. Before the eradication, researchers collected baseline biodiversity data. On land, they recorded bird calls and took soil samples. In the surrounding water, they measured indicators like fish biomass and coral cover. One year after rats were removed, the team repeated the survey and found a dramatic improvement in the biodiversity. Freed from rat predation, seabird activity on the island surged. Detections of bridled tern (Onychoprion anaethetus) calls rose by…This article was originally published on Mongabay