Alfredo Ascanio, Brianna Louis, Andrew Cannizzaro, Victor Fitzgerald, Jason T. Bracken, Nicholas L. Rodenhouse, Thomas O. Crist, Tereza Jezkova
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Overall, we found that <i>Magicicada cassini</i>, <i>M. septendecim,</i> and <i>M. septendecula</i> were present in all studied sites, though the most abundant for the region was <i>M. cassini</i>. Our results revealed a generational decline in cicada density in old-growth forest and rural woodlots, while fencerows, often considered heavily disturbed habitats, showed a doubling in density across generations. Phenological data showed consistent protandry (earlier male emergence), with an increased offset between sexes in the 2021 emergence compared to 1987. Emergence timing also varied across habitats, with rural woodlots showing the earliest emergence and urban woodlots and fencerows (mainly composed by edge habitat) showing the latest. These findings challenge assumptions that disturbed habitats universally reduce insect populations and suggest that treed fencerows may serve as important reproductive refuges under certain conditions. However, variance and delay in female emergence may indicate changing environmental cues or phenological mismatches, potentially reducing reproductive success. To aid conservation efforts, we recommend continued and expanded monitoring of future Brood X emergences, expansion of sampling in old-growth forest sites, along with incentives to preserve and manage treed fencerows while also expanding existing tracts of forest.</p>","PeriodicalId":48930,"journal":{"name":"Ecosphere","volume":"16 8","pages":""},"PeriodicalIF":2.9000,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://esajournals.onlinelibrary.wiley.com/doi/epdf/10.1002/ecs2.70377","citationCount":"0","resultStr":"{\"title\":\"Multigenerational emergence trends of Brood X Magicicada spp. across habitat types in southwestern Ohio\",\"authors\":\"Alfredo Ascanio, Brianna Louis, Andrew Cannizzaro, Victor Fitzgerald, Jason T. Bracken, Nicholas L. 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引用次数: 0
摘要
周期蝉(Magicicada spp.)在美国大陆东部和中西部每隔13或17年从地下出现一次。由于它们的世代较长,这些动物很容易受到快速环境变化的影响,这导致了密度下降,甚至灭绝了不同的魔法卵群。研究了俄亥俄州西南部三次繁殖事件(1987年、2004年和2021年)的种群密度和羽化物候变化趋势,比较了不同程度人为干扰或来源的栖息地:原生林、农村林地、农村围栏和城市林地(2021年新增)。总体而言,我们发现Magicicada cassini, M. septendecim和M. septendecula在所有研究地点都存在,尽管该地区最多的是M. cassini。我们的研究结果显示,在原始森林和农村林地中,蝉的密度呈代际下降趋势,而通常被认为受到严重干扰的围栏栖息地,其密度在几代之间翻了一番。物候数据显示,与1987年相比,2021年出现的雌雄之间的抵消增加了。不同生境的羽化时间也各不相同,农村林地羽化最早,城市林地和围栏(主要由边缘生境组成)羽化最晚。这些发现挑战了被干扰的栖息地普遍减少昆虫数量的假设,并表明树木篱笆可能在某些条件下作为重要的生殖避难所。然而,雌性出现的差异和延迟可能表明环境因素的变化或物候不匹配,潜在地降低了生殖成功率。为了帮助保护工作,我们建议继续和扩大对未来X型幼虫出现情况的监测,扩大在原始森林地点的采样,以及在扩大现有森林面积的同时保护和管理树木围栏的激励措施。
Multigenerational emergence trends of Brood X Magicicada spp. across habitat types in southwestern Ohio
Periodical cicadas (Magicicada spp.) emerge from the ground every 13- or 17-year intervals across the eastern and midwestern continental United States. Due to their long generation times, these animals are vulnerable to rapid environmental change, which has contributed to decreased densities and even extinction of different Magicicada broods. We investigated trends in population density and emergence phenology of Brood X cicadas across three reproductive events (1987, 2004, and 2021) in southwestern Ohio, comparing habitats with different levels of anthropogenic disturbance or origin: old-growth forest, rural woodlots, rural fencerows, and urban woodlots (added in 2021). Overall, we found that Magicicada cassini, M. septendecim, and M. septendecula were present in all studied sites, though the most abundant for the region was M. cassini. Our results revealed a generational decline in cicada density in old-growth forest and rural woodlots, while fencerows, often considered heavily disturbed habitats, showed a doubling in density across generations. Phenological data showed consistent protandry (earlier male emergence), with an increased offset between sexes in the 2021 emergence compared to 1987. Emergence timing also varied across habitats, with rural woodlots showing the earliest emergence and urban woodlots and fencerows (mainly composed by edge habitat) showing the latest. These findings challenge assumptions that disturbed habitats universally reduce insect populations and suggest that treed fencerows may serve as important reproductive refuges under certain conditions. However, variance and delay in female emergence may indicate changing environmental cues or phenological mismatches, potentially reducing reproductive success. To aid conservation efforts, we recommend continued and expanded monitoring of future Brood X emergences, expansion of sampling in old-growth forest sites, along with incentives to preserve and manage treed fencerows while also expanding existing tracts of forest.
期刊介绍:
The scope of Ecosphere is as broad as the science of ecology itself. The journal welcomes submissions from all sub-disciplines of ecological science, as well as interdisciplinary studies relating to ecology. The journal''s goal is to provide a rapid-publication, online-only, open-access alternative to ESA''s other journals, while maintaining the rigorous standards of peer review for which ESA publications are renowned.