MASS MORTALITY AND EXTINCTION IN A HIGH-ELEVATION POPULATION OF RANA-MUSCOSA
MASS MORTALITY AND EXTINCTION IN A HIGH-ELEVATION POPULATION OF RANA-MUSCOSA
复制标题
DOI：
10.2307/1564645
复制
发表时间：
1991-06-01
影响因子：
0.8
通讯作者：
BRADFORD, DF
中科院分区：
文献类型：
--
作者：
BRADFORD, DF
蛙muscosa是几个高海拔两栖动物之一，最近已经从看似原始的网站消失。 本研究记录了一个事件的大规模死亡的幼虫和变态的R。在国王峡谷国家公园，加州的湖泊中的muscosa，以及种群的最终灭绝。 1979年，变态个体从大约下降。初夏有800只，夏末几乎为零。 在此期间，收集了许多尸体，个体表现出红腿病的症状，并且受影响个体的血液含有这种疾病的细菌病原体特征，Aeromonaserma。 同样在1979年夏天，几乎所有的约1100蝌蚪开始变态，但所有变态的个人被布鲁尔的黑鸟（Euphagus cyanocephalus）消耗。 该种群R.至少在1983年之前，白云母一直存在，但在1989年灭绝。 重新殖民的网站可能永远不会发生，因为溪流连接到现存的种群R。muscosa现在包含引入的鱼类。
Rana muscosa is one of several high-elevation amphibians that have recently disappeared from seemingly pristine sites. The present study documents an event of mass mortality among larval and metamorphosed R. muscosa in a lake in Kings Canyon National Park, California, and the ultimate extinction of the population. In 1979 metamorphosed individuals declined from ca. 800 individuals in early summer to nearly zero in late summer. During this time many carcasses were collected, individuals showed symptoms of red-leg disease, and blood from an affected individual contained the bacterial pathogen characteristic of this disease, Aeromonas hydrophila. Also during the summer of 1979, nearly all of the approximately 1100 tadpoles began metamorphosis, but all metamorphosing individuals were consumed by Brewer's blackbirds (Euphagus cyanocephalus). This population of R. muscosa continued to exist until at least 1983, but was extinct by 1989. Recolonization of the site will probably never occur because streams connecting to extant populations of R. muscosa now contain introduced fishes.