Assemblages of orthopteroid insects along environmental gradients in central and southern Madagascar

IF 1 Q3 ENTOMOLOGY
A. Krištín, K. Heller, M. Zemko, Jacques S. Rakotondranary, B. Jarčuška
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引用次数: 5

Abstract

Madagascar is one of the world hotspots for endemics, and its rapidly changing habitats accelerate the need for their study and conservation. Orthopterans, mantids, phasmids, and cockroaches were sampled in five main habitats (savanna and shrubland, semiarid spiny forest, rainforest, mountain grass- and shrubland, and cultivated habitats) in central and southern Madagascar (41 sites, 0–2250 m a.s.l.) with the aim of getting the first data on their diversity and distribution along environmental gradients shortly after the rainy period. Samples were collected primarily by sweeping herb and shrub vegetation along transects 100 m long and 1–2 m wide (5–8 transects/site) and supplemented using other techniques. Altogether 117 species of orthopteroid insects were found (94 Orthoptera, 7 Mantodea, 4 Phasmida, and 12 Blattodea), among them two katydid species which had been recently described as new to science (Mimoscudderia longicaudataHeller & Krištín, 2019,Parapyrrhicia leucaHemp & Heller, 2019). High species diversity was documented: altogether 63 species (53.8%) were present at only one site, 14 (12%) at two sites, and 5 species (4.2%) at three sites. Nonmetric multidimensional scaling analysis on species composition did not clearly separate the assemblages of the sampled sites. Species assemblages from four habitats overlapped due to their similarity. Only assemblages from the rainforest sites were partially separated from the other sites. Cultivated habitats were characterized by the most frequent (F > 50%) and abundant grasshopper species, such asAcorypha decisa,Aiolopus thalassinus rodericensis,Oedaleus virgula,Gelastorrhinus edax,Gymnobothrusspp,. andAcrotylusspp. We found a significant association between habitat management and species rareness, where the number of rare species was higher in natural/unmanaged habitats. However, we found no association between habitat management and the number of endemic species. For several species we provide the first detailed data on their localities and habitat.
马达加斯加中部和南部环境梯度上的直翅目昆虫群落
马达加斯加是世界上特有物种的热点地区之一,其迅速变化的栖息地加速了对它们的研究和保护的需求。在马达加斯加中部和南部的五个主要生境(热带稀树草原和灌丛、半干旱刺状林、雨林、山地草地和灌丛以及栽培生境)(41个地点,海拔0-2250米)对直脚类、螳螂类、phasmid类和蟑螂进行了取样,目的是在雨季后不久获得它们沿环境梯度的多样性和分布的第一次数据。样品主要通过沿100 m长1-2 m宽的样带(5-8样带/点)清扫草本和灌木植被收集,并辅以其他技术。共发现直翅目昆虫117种(直翅目94种,Mantodea 7种,Phasmida 4种,bltodea 12种),其中2种为新发现物种(Mimoscudderia longicaudataHeller & Krištín, 2019; Parapyrrhicia leucaHemp & Heller, 2019)。物种多样性较高:1个样点有63种(53.8%),2个样点有14种(12%),3个样点有5种(4.2%)。物种组成的非度量多维尺度分析不能清晰地区分采样点的组合。四种生境的物种组合由于其相似性而重叠。只有来自雨林遗址的组合与其他遗址部分分离。人工生境中蚱蜢种类最多(约占50%),主要有acorypha decisa、Aiolopus thalassinus rodericensis、Oedaleus virgula、Gelastorrhinus edax、Gymnobothrusspp等。andAcrotylusspp。我们发现栖息地管理与物种稀缺性之间存在显著关联,其中自然/非管理栖息地的珍稀物种数量更高。然而,我们没有发现生境管理与特有物种数量之间的关联。对于一些物种,我们提供了它们的位置和栖息地的第一个详细数据。
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来源期刊
Journal of Orthoptera Research
Journal of Orthoptera Research Agricultural and Biological Sciences-Insect Science
CiteScore
1.90
自引率
25.00%
发文量
20
审稿时长
12 weeks
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