Critical thermal maxima in neotropical ants at colony, population, and community levels.

IF 1.6 3区 农林科学 Q2 ENTOMOLOGY Bulletin of Entomological Research Pub Date : 2024-08-01 Epub Date: 2024-09-23 DOI:10.1017/S0007485324000567
Geraldo Nascimento, Talita Câmara, Xavier Arnan
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Abstract

Global warming is exposing many organisms to severe thermal conditions and is having impacts at multiple levels of biological organisation, from individuals to species and beyond. Biotic and abiotic factors can influence organismal thermal tolerance, shaping responses to climate change. In eusocial ants, thermal tolerance can be measured at the colony level (among workers within colonies), the population level (among colonies within species), and the community level (among species). We analysed critical thermal maxima (CTmax) across these three levels for ants in a semiarid region of northeastern Brazil. We examined the individual and combined effects of phylogeny, body size (BS), and nesting microhabitat on community-level CTmax and the individual effects of BS on population- and colony-level CTmax. We sampled 1864 workers from 99 ant colonies across 47 species, for which we characterised CTmax, nesting microhabitat, BS, and phylogenetic history. Among species, CTmax ranged from 39.3 to 49.7°C, and community-level differences were best explained by phylogeny and BS. For more than half of the species, CTmax differed significantly among colonies in a way that was not explained by BS. Notably, there was almost as much variability in CTmax within colonies as within the entire community. Monomorphic and polymorphic species exhibited similar levels of CTmax variability within colonies, a pattern not always explained by BS. This vital intra- and inter-colony variability in thermal tolerance is likely allows tropical ant species to better cope with climate change. Our results underscore why ecological research must examine multiple levels of biological organisation.

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新热带蚂蚁在蚁群、种群和群落层面的临界最大热量。
全球变暖使许多生物暴露在严酷的热条件下,并对生物组织的多个层次(从个体到物种及其他)产生影响。生物和非生物因素会影响生物的热耐受性,从而形成对气候变化的反应。在群居蚂蚁中,热耐受性可在蚁群水平(蚁群中的工蚁)、种群水平(物种内的蚁群之间)和群落水平(物种之间)进行测量。我们分析了巴西东北部半干旱地区蚂蚁在这三个层面上的临界最大热量(CTmax)。我们研究了系统发育、体型(BS)和筑巢微生境对群落水平 CTmax 的个体影响和综合影响,以及 BS 对种群和群落水平 CTmax 的个体影响。我们从 47 个物种的 99 个蚂蚁群落中采集了 1864 个工蚁样本,对其 CTmax、筑巢微生境、BS 和系统发育历史进行了描述。在不同的物种中,CTmax的范围从39.3到49.7°C不等,系统发育和BS最能解释群落水平的差异。在一半以上的物种中,不同群落之间的 CTmax 差异很大,而 BS 无法解释这种差异。值得注意的是,群落内部 CTmax 的差异几乎与整个群落内部的差异一样大。单态和多态物种在群落内的 CTmax 变异水平相似,这种模式并不总是能用 BS 来解释。蚁群内和蚁群间这种重要的热耐受性变异很可能使热带蚂蚁物种能够更好地应对气候变化。我们的研究结果强调了为什么生态学研究必须考察生物组织的多个层次。
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来源期刊
CiteScore
4.00
自引率
0.00%
发文量
160
审稿时长
6-12 weeks
期刊介绍: Established in 1910, the internationally recognised Bulletin of Entomological Research aims to further global knowledge of entomology through the generalisation of research findings rather than providing more entomological exceptions. The Bulletin publishes high quality and original research papers, ''critiques'' and review articles concerning insects or other arthropods of economic importance in agriculture, forestry, stored products, biological control, medicine, animal health and natural resource management. The scope of papers addresses the biology, ecology, behaviour, physiology and systematics of individuals and populations, with a particular emphasis upon the major current and emerging pests of agriculture, horticulture and forestry, and vectors of human and animal diseases. This includes the interactions between species (plants, hosts for parasites, natural enemies and whole communities), novel methodological developments, including molecular biology, in an applied context. The Bulletin does not publish the results of pesticide testing or traditional taxonomic revisions.
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