| mercury levels of nelson's and saltmarsh sparrows at wintering grounds in virginia, usa. | nelson's and saltmarsh sparrows (ammodramus nelsoni and a. caudacutus) have recently been recognized as separate species, and because of their limited distributions and the susceptibility of their wetland habitats to climate change, these two new species are of conservation concern. both species are known to bioaccumulate mercury at breeding sites in new england, usa where their ranges overlap, with the saltmarsh sparrow reported to have twice the concentration of blood total mercury. in this st ... | 2011 | 21698442 |