The logic of conventional and reversed Bateman gradients.

IF 3.8 1区 生物学 Q1 BIOLOGY Proceedings of the Royal Society B: Biological Sciences Pub Date : 2024-11-01 Epub Date: 2024-11-06 DOI:10.1098/rspb.2024.2126
Jussi Lehtonen, Geoff A Parker, Camilla M Whittington
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Abstract

The Bateman gradient is a central concept in sexual selection theory that relates reproductive success to mate number, with important consequences for sex-specific selection. The conventional expectation is that Bateman gradients are steeper in males than females, implying that males benefit more from multiple mating than females do. This claim is supported by much empirical evidence as well as mathematical modelling. However, under some reproductive systems, reversed Bateman gradients are observed, perhaps most notably in syngnathid fishes with male pregnancy. Unlike conventional Bateman gradients, the causal basis of such reversed Bateman gradients has never been modelled mathematically. Here, we present a sex-neutral mathematical model demonstrating how restrictions in capacity for carrying or incubating gametes and embryos (brooding) interact with anisogamy, generating both conventional and reversed Bateman gradients from a single mathematical model. The results clearly demonstrate how anisogamy tends to cause conventional Bateman gradients, but diminishing male brooding capacity under male pregnancy or nesting causes a gradual reversal from conventional to fully 'reversed' Bateman gradients.

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传统和反向贝特曼梯度的逻辑。
贝特曼梯度是性选择理论中的一个核心概念,它将繁殖成功率与交配次数联系起来,并对性别选择产生重要影响。传统的观点认为,雄性的贝特曼梯度比雌性更陡,这意味着雄性比雌性更能从多次交配中获益。许多经验证据和数学模型都支持这一观点。然而,在某些生殖系统中,贝特曼梯度发生了逆转,最明显的可能是在雄性怀孕的鞘翅目鱼类中。与传统的贝特曼梯度不同,这种反向贝特曼梯度的因果基础从未被数学模型化。在这里,我们提出了一个性别中性的数学模型,展示了携带或孵化配子和胚胎(育雏)能力的限制如何与一夫一妻制相互作用,并通过一个数学模型产生了传统的和逆转的贝特曼梯度。结果清楚地表明,一夫一妻制往往会导致传统的贝特曼梯度,但在雄性怀孕或筑巢的情况下,雄性育雏能力的减弱会导致贝特曼梯度从传统梯度逐渐逆转到完全 "逆转"。
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来源期刊
CiteScore
7.90
自引率
4.30%
发文量
502
审稿时长
1 months
期刊介绍: Proceedings B is the Royal Society’s flagship biological research journal, accepting original articles and reviews of outstanding scientific importance and broad general interest. The main criteria for acceptance are that a study is novel, and has general significance to biologists. Articles published cover a wide range of areas within the biological sciences, many have relevance to organisms and the environments in which they live. The scope includes, but is not limited to, ecology, evolution, behavior, health and disease epidemiology, neuroscience and cognition, behavioral genetics, development, biomechanics, paleontology, comparative biology, molecular ecology and evolution, and global change biology.
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