Habitat Use by the Federally Endangered Mitchell's Satyr Butterfly (Neonympha mitchellii mitchellii) in a Michigan Prairie Fen
Habitat Use by the Federally Endangered Mitchell's Satyr Butterfly (Neonympha mitchellii mitchellii) in a Michigan Prairie Fen
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密歇根草原沼泽中联邦濒临灭绝的米切尔色狼蝴蝶 (Neonympha mitchellii mitchellii) 的栖息地使用
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
C. Bach
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文献类型：
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作者：
B. J. Barton;C. Bach
摘要米契尔氏半羊蝶（Nephalphamitchellii mitchellii）是一种限制性的沼泽物种，目前被美国鱼类和野生动物管理局列为濒危物种，被认为是北美最稀有的蝴蝶之一。本研究的目的是估计人口规模，确定研究地点内的分布和这一重要物种的栖息地利用的特点。在密歇根州杰克逊县的一个草原沼泽进行的标记-释放-再捕获研究得出的总人口估计为1106人。大多数N. M.米氏针茅是在开阔的沼泽或莎草草甸与塔马拉克/阔叶林交界处，距木本植被3 m以内的地方捕获的。N.的分布M.沼泽内的米切利虫是丛生的。男性和女性的最长飞行距离分别为511.8米和344.8米。最小家域值为0.22公顷的男性和0.07公顷的女性。与先前对密歇根州西南部两个种群的研究相比，这些个体飞得更远，种群和家域的大小也更大。这一新的信息对于物种的保护至关重要，并提供了证据，表明如果孤立的殖民地之间存在联系，个体可能能够分散到新的地区。
Abstract Mitchell's satyr (Neonympha mitchellii mitchellii) is a restricted fen species currently listed as endangered by the U.S. Fish and Wildlife Service and is considered one of the rarest butterflies in North America. The objectives of this study were to estimate population size, determine distribution within the study site and characterize habitat use for this important species. A mark-release-recapture study conducted at a prairie fen in Jackson County, Michigan, yielded a total population estimate of 1106 individuals. Most N. m. mitchellii were captured at the interface of open fen or sedge meadow and tamarack/hardwood forest within 3 m of woody vegetation. Distribution of N. m. mitchellii within the fen was clumped. The longest distances flown by males and females were 511.8 m and 344.8 m, respectively. Minimum home range values were 0.22 ha for males and 0.07 ha for females. Compared with prior studies on two populations in southwestern Michigan, these individuals flew significantly farther and had much larger population and home range sizes. This new information is critical for the conservation of the species and provides evidence that individuals may be capable of dispersing to new areas if linkages exist between isolated colonies.