Age Structure and Size Variation in Three Closely Related Species of Casque-Headed Frogs of the Genus Trachycephalus (Hylidae: Lophyohylini)

IF 1.3 4区 生物学 Q4 ANATOMY & MORPHOLOGY
Acta Zoologica Pub Date : 2025-04-17 DOI:10.1111/azo.12552
Isabella Parreira, Fernanda B. Passaglia, Pedro P. de Queiroz, Anderson K. S. De-Lima, Reuber A. Brandão
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Abstract

Parreira. I.P. 2025. Age structure and size variation in three closely related species of casque-headed frogs of the genus Trachycephalus (Hylidae: Lophyohylini)—Acta zoologica (Estocolmo). This study provides insights into longevity, sexual maturity and growth curves in closely related casque-headed treefrogs distributed across distinct Brazilian biomes. Age estimation based on the counting of lines of arrested growth (LAGs) in bone tissue revealed a longevity of 6 years in Trachycephalus nigromaculatus and T. atlas, which is uncommon among Neotropical species. T. mambaiensis exhibited a distinct pattern of sexual maturity compared to the other species, suggesting divergent developmental strategies within the clade and possibly reflecting a higher reproductive investment at younger ages. A correlation between estimated age and snout–vent length (SVL) was observed in two of the three analysed species (T. nigromaculatus and T. atlas); however, this correlation may vary depending on the sampled locality and sample size. The growth model revealed distinct patterns within the clade: T. nigromaculatus exhibited a decline in growth rate corresponding to the age of sexual maturity, whereas T. atlas showed a non-stabilised growth pattern. Our findings provide novel information for understanding the life history of explosive breeding species and emphasise the importance of museum specimens in ecological and evolutionary research.

Abstract Image

冠头蛙属三种近缘种的年龄结构和体型变异(蛙科:冠头蛙)
佩雷拉。ip 2025。冠头蛙属三种近缘种的年龄结构和体型变化——动物学学报(Estocolmo)。这项研究提供了对分布在不同巴西生物群系的密切相关的冠头树蛙的寿命、性成熟和生长曲线的见解。基于骨组织中生长阻滞线(lag)计数的年龄估计显示,黑斑马鱼和地图龙的寿命为6年,这在新热带物种中是罕见的。与其他物种相比,mambaiensis表现出不同的性成熟模式,表明进化支系内部存在不同的发育策略,可能反映了较年轻时更高的生殖投资。在3个被分析的物种中,有2个物种(黑斑田鼠和阿特拉斯田鼠)的估计年龄与鼻口长度(SVL)之间存在相关性;然而,这种相关性可能因采样地点和样本量而异。生长模型揭示了进化分支内的不同模式:黑斑棘猴的生长速度随性成熟年龄的增长而下降,而地图集棘猴的生长模式则不稳定。我们的发现为了解爆炸性繁殖物种的生活史提供了新的信息,并强调了博物馆标本在生态和进化研究中的重要性。
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来源期刊
Acta Zoologica
Acta Zoologica 生物-动物学
CiteScore
2.90
自引率
8.30%
发文量
35
审稿时长
>12 weeks
期刊介绍: Published regularly since 1920, Acta Zoologica has retained its position as one of the world''s leading journals in the field of animal organization, development, structure and function. Each issue publishes original research of interest to zoologists and physiologists worldwide, in the field of animal structure (from the cellular to the organismic level) and development with emphasis on functional, comparative and phylogenetic aspects. Occasional review articles are also published, as well as book reviews.
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