高草草原帝王贝母(Speyeria idalia)性别比例:调查时间和管理制度的影响

IF 0.6 4区 环境科学与生态学 Q4 Agricultural and Biological Sciences
K. McCullough, D. Haukos, G. Albanese
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引用次数: 1

摘要

摘要帝王贝母,Speyeria idalia(Drury),曾经是北美草原社区的普通居民。据报道,帝王贝母种群在其整个范围内都存在雄性偏性的成年性别比(ASR)。我们评估了在全年飞行期间观察到的帝王贝母ASR,调查了两性的总体密度如何变化,并测试了规定的火灾、放牧和干草管理处理对雄性和雌性密度的影响。我们发现,在整个羽化期,帝王贝母表现出2:1的雄性偏性ASR。我们的分析还表明,在飞行期间,雄性密度比雌性密度更早达到峰值。密度点估计表明,在中等火灾重现期内接受规定燃烧的地点,与短时间和长时间火灾重现期燃烧的地点相比,支持的男性密度≥1.3倍,女性密度≥5.6倍。此外,当与放牧相结合时,这种影响得到了增强,与其他地点相比,在中等火灾重现期放牧和焚烧的地点,雄性的密度估计值≥1.9倍,雌性的密度估计点≥1.2倍。在我们的研究区域内,帝王贝母的相对稳定状态表明,2:1的雄性对雌性ASR可能被认为是整个范围内种群的模式组成。同样,ASR在整个飞行周期内的动态特性突出了在整个飞行期间进行调查的重要性。最后,这些结果证实了越来越多的研究结果,这些研究结果揭示了常见的草原管理实践,例如规定的火灾可以应用于含有帝王贝母的地点,并继续支持稳定的种群。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Regal Fritillary (Speyeria idalia) Sex Ratio in Tallgrass Prairie: Effects of Survey Timing and Management Regime
Abstract. The regal fritillary, Speyeria idalia (Drury), was once a common inhabitant of North American grassland communities. Regal fritillary populations are commonly reported to have a male biased adult sex ratio (ASR) throughout their range. We assessed the observed ASR of regal fritillary throughout an annual flight period, investigated how the overall density of both sexes changed, and tested effects of prescribed fire, grazing and haying management treatments on male and female density. We found that regal fritillary exhibited an observed 2:1 male biased ASR across the entire emergence period. Our analysis also revealed that male density peaked earlier than female density in the flight period. Point estimates of density indicated sites that received prescribed burning at the moderate fire-return interval supported ≥1.3 times greater density of males and ≥5.6 times greater density of females versus sites burned with short and long fire-return intervals. Additionally, this effect was enhanced when combined with grazing which showed males were ≥1.9 times and females had ≥1.2 times greater point estimates of density in sites that were grazed and burned at a moderate fire-return interval versus other sites. The relatively stable status of regal fritillary within our study region suggests that a 2:1 male to female ASR may be considered the model composition of populations throughout their range. Likewise, the dynamic nature of the ASR throughout the flight period highlights the importance of conducting surveys across the flight period. Finally, these results corroborate an increasing number of research results that reveal common prairie management practices, such as prescribed fire can be applied within sites that contain regal fritillary and continue to support stable populations.
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来源期刊
American Midland Naturalist
American Midland Naturalist 环境科学-生态学
CiteScore
1.20
自引率
0.00%
发文量
38
审稿时长
18-36 weeks
期刊介绍: The American Midland Naturalist has been published for 90 years by the University of Notre Dame. The connotations of Midland and Naturalist have broadened and its geographic coverage now includes North America with occasional articles from other continents. The old image of naturalist has changed and the journal publishes what Charles Elton aptly termed "scientific natural history" including field and experimental biology. Its significance and breadth of coverage are evident in that the American Midland Naturalist is among the most frequently cited journals in publications on ecology, mammalogy, herpetology, ornithology, ichthyology, parasitology, aquatic and invertebrate biology and other biological disciplines.
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