The darker the color, the more favorable the climate conditions are for survival. The outlined areas represent approximate current range for each season. More on reading these maps.
As small alcids go, this one is relatively well known. The Ancient Murrelet disperses south along the West Coast of the U.S. in winter, with small numbers occurring close to shore. Audubon's climate model suggests that such sightings may decline in the decades ahead, with the species’ winter range shifting northward. Overall, an increase in the total amount of climatically suitable area is forecast. Given this alcid’s relatively strong powers of dispersal, it would seem to be a candidate for a climate-mediated range shift. Not examined is the situation during the breeding season, at which time the Ancient Murrelet is known to be susceptible to introduced predators.