The Second Antenna of Caridean Shrimps: An Approach on the Variation of Flagellar Setae among Species with Different Mating Systems.

IF 2.1 4区 生物学 Q2 BIOLOGY
Biological Bulletin Pub Date : 2024-04-01 Epub Date: 2025-02-03 DOI:10.1086/734627
Caio Santos Nogueira, Rafael Carvalho Santos, Milena Silva Jaconis, Régis Augusto Pescinelli
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Abstract

AbstractThe setae on the antennae of caridean shrimps perform chemoreceptive functions, including the identification of potential mating partners. Variation in the number of setae on the antennal flagellum has been reported as a sexually dimorphic trait in these organisms. This difference is correlated with the distinct mating systems and reproductive behaviors of these animals. This study investigates the variation in the number of antennal flagellar setae in four species of shrimps from the genus Macrobrachium, which are grouped into two distinct mating systems. Two species with a pure search mating system (M. jelskii and M. pantanalense) and two with a neighborhoods of dominance mating system (M. acanthurus and M. olfersii) were analyzed. The setae were quantified using light microscopy, morphologically characterized through scanning electron microscopy, and then compared among the demographic groups of each species. The results show that in the pure search species, males possess a significantly higher number of setae than females (P < 0.01). In the neighborhoods of dominance species, dominant males of M. acanthurus and M. olfersii had more setae than subordinate males and females (P < 0.01). The same types of setae, denticulate and simple, were found in all species. We conclude that the variation in the number of flagellar setae is correlated with the mating system of each species and their specific reproductive behaviors, suggesting a morphological adaptation to optimize chemoreception in different reproductive events. These findings contribute to the understanding of reproductive strategies and sensory adaptations in crustaceans.

虾的第二触角:不同交配制度下种间鞭毛刚毛变异的探讨。
摘要虾触角上的刚毛具有化学接受功能,包括识别潜在的交配对象。据报道,触角鞭毛上刚毛数量的变化是这些生物的两性二态特征。这种差异与这些动物不同的交配系统和繁殖行为有关。本研究调查了巨臂虾属四种虾的触角鞭毛刚毛数量的变化,这些虾被分为两个不同的交配系统。对纯搜索交配系统的2种(M. jelskii和M. pantanalense)和邻域优势交配系统的2种(M. acanthurus和M. olfersii)进行了分析。利用光镜对其刚毛进行定量分析,通过扫描电镜对其形态进行表征,并在各种群间进行比较。结果表明,在纯搜索种中,雄性的刚毛数量显著高于雌性(P < 0.01)。优势种邻域内,棘毛鼠和欧氏鼠的优势雄虫的刚毛数均高于从属雄虫和雌性(P < 0.01)。所有种的刚毛类型相同,有小齿和单根。我们认为鞭毛刚毛数量的变化与不同物种的交配制度及其特定的生殖行为有关,表明在不同的生殖事件中,鞭毛刚毛的形态适应是为了优化化学接受。这些发现有助于理解甲壳类动物的生殖策略和感觉适应。
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来源期刊
Biological Bulletin
Biological Bulletin 生物-海洋与淡水生物学
CiteScore
3.30
自引率
6.20%
发文量
47
审稿时长
6-12 weeks
期刊介绍: The Biological Bulletin disseminates novel scientific results in broadly related fields of biology in keeping with more than 100 years of a tradition of excellence. The Bulletin publishes outstanding original research with an overarching goal of explaining how organisms develop, function, and evolve in their natural environments. To that end, the journal publishes papers in the fields of Neurobiology and Behavior, Physiology and Biomechanics, Ecology and Evolution, Development and Reproduction, Cell Biology, Symbiosis and Systematics. The Bulletin emphasizes basic research on marine model systems but includes articles of an interdisciplinary nature when appropriate.
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