Microhabitat use and seasonality of the sexually dimorphic West African centaurus beetle Augosoma centaurus

IF 0.7 4区 农林科学 Q4 ENTOMOLOGY Entomological Science Pub Date : 2021-11-08 DOI:10.1111/ens.12494
Daniele Dendi, Stephanie N. Ajong, Edem A. Eniang, Gabriel Hoinsoudé Segniagbeto, Delagnon Assou, Guillaume K. Ketoh, Mondjonnesso Gomina, Raoufou Radji, Gift Simon Demaya, John Sebit Benansio, Calogero Muscarella, Massimiliano Di Vittorio, Julia E. Fa, Giovanni Amori, Luca Luiselli
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引用次数: 1

Abstract

The sexually dimorphic dynastine centaurus beetle, genus Augosoma (Coleoptera: Scarabeidae), is endemic to tropical Africa where two species are found (A. centaurus and A. hippocrates). These beetles are consumed by rural populations, cause damage in plantations and are targets of insect collectors and traders. We present information on size differences and analyzed intersexual niche divergence and seasonality of A. centaurus in seven study sites in three West African countries (Ivory Coast, Togo and Nigeria). We recorded 711 light-attracted and/or opportunistically encountered individuals, as well as another 97 beetles in standardized transect surveys. In the latter, we found the adult sex ratio was equal, but was significantly skewed towards females in light-attracted and/or opportunistically encountered individuals. In a sample of 298 adult beetles, males were significantly larger than females, with almost no size overlap between sexes. Beetle activity was highly seasonal with most animals observed in November, active from 19:00 h to 24:00 h. Differences in habitat use were not significant between sexes, with most individuals observed in secondary forest. Males were found higher on vegetation than females and beetles of both sexes were found on Pandanus and raffia palms. Beetles were larger in sites with more vegetation cover, and there was a significant effect of tree species on body size of both sexes. Study area or country had no effect on any of the studied parameters. Our study confirms that transect surveys without light trapping can be an effective tool for understanding large-sized tropical beetles of similar ecological characteristics.

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雌雄二型的西非半人马座甲虫的微生境利用和季节变化
两性异形的dynastine半人马甲虫,Augosma属(鞘翅目:Scarabeidae),是热带非洲的特有种,在那里发现了两个物种(A.半人马和A.河马)。这些甲虫被农村人口食用,对种植园造成破坏,是昆虫收集者和贸易商的目标。我们在西非三个国家(科特迪瓦、多哥和尼日利亚)的七个研究地点提供了关于半人马体型差异的信息,并分析了半人马的性别生态位差异和季节性。我们在标准横断面调查中记录了711只被光吸引和/或偶然遇到的个体,以及另外97只甲虫。在后者中,我们发现成年人的性别比例是相等的,但在光线吸引和/或偶然遇到的个体中,性别比例明显偏向女性。在298只成年甲虫的样本中,雄性比雌性大得多,性别之间几乎没有大小重叠。甲壳虫的活动具有高度季节性,大多数动物在11月观察到,活动时间为19:00 h至24:00 h.栖息地使用的性别差异不显著,大多数个体在次生林中观察到。在植被上发现雄性比雌性高,在Pandanus和Rafia棕榈树上发现两性甲虫。甲虫在植被覆盖较多的地方体型较大,树种对两性体型都有显著影响。研究地区或国家对任何研究参数都没有影响。我们的研究证实,在没有光捕获的情况下进行样带调查可以成为了解具有类似生态特征的大型热带甲虫的有效工具。
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来源期刊
Entomological Science
Entomological Science 生物-昆虫学
CiteScore
2.00
自引率
11.10%
发文量
30
审稿时长
6-12 weeks
期刊介绍: Entomological Science is the official English language journal of the Entomological Society of Japan. The Journal publishes original research papers and reviews from any entomological discipline or from directly allied field in ecology, behavioral biology, physiology, biochemistry, development, genetics, systematics, morphology, evolution and general entomology. Papers of applied entomology will be considered for publication if they significantly advance in the field of entomological science in the opinion of the Editors and Editorial Board.
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