The Rusty Blackbird's tailspin leaves conservationists scratching their heads. The results were disturbing.

Because 85% of the Rusty Blackbird’s breeding range is located in Canada, it is a species for which Canada has a major conservation responsibility. This phenomenon suggests a climate change connection, but no mechanism has been identified to date. North American Breeding Bird Survey (BBS) trends in abundance are estimated to be 12.5%/yr over the last 40 years, which is tantamount to a 95% cumulative decline. (Updated: 2018/01/19) Top. If more than 90 percent of the robins, mallards, or ring-necked pheasants in North America disappeared over the course of a few decades, people would notice. Scientists have been paying closer attention to the rusty blackbird’s plight in recent years.

The International Rusty Blackbird Working Group (IRBWG) was founded in 2005 to foster communications among people seeking to understand and reverse the decline of the Rusty Blackbird. the Rusty Blackbird (Euphagus carolinus) has experienced a population decline of >85% since the 1960s and, on the ba-sis of the Breeding Bird Survey, may be losing population at a rate of −13% per year, a rate of decline exceeding that of other boreal breeding birds (greenberg and droege 1999, niven et al. Distribution and Population. The Rusty Blackbird has a wide distribution across boreal regions of Canada, and breeds in all Canadian provinces and territories. 2008). decline remains a mystery. But an abundant, nondescript species of blackbird was a … A Slow Fade. The International Rusty Blackbird Technical Group (Group) was formed in the spring of 2005 to address this gap As late as 2005, the Rusty Blackbird’s decline remained poorly publicized and no detailed studies had been initiated to understand the species’ resource requirements, basic biology, or causes for decline.

Yet, they still don’t have a good fix on what caused the decline.

The Rusty Blackbird (Euphagus caroli-nus), a formerly common breeding species of boreal wetlands, has exhibited the most marked decline of any North American landbird.

In 40 years, the once-common Rusty Blackbird lost between 85 and 95 percent of its population, making it one of the fastest declining North American landbirds. The only North American blackbird more troubled is the Tricolored Blackbird, a localized and declining bird of West Coast wetlands. The Rusty Blackbird has experienced a dramatic population decline accompanied by a range retraction to the north and higher elevations. Rusty blackbirds were in serious decline. 2004, Sauer et al. … Read …
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