通过男性介导的早期成熟不太可能通过适应性进化进化
Brian A Lerch1, Matthew N Zipple2, Laurence R Gesquiere3
1Department of Biology, University of North Carolina Chapel Hill, NC, U.S.A.
Animal behaviour
|July 22, 2024
概括
范登伯格效应,即雌性在暴露于雄性时成熟,很可能是格拉达的布鲁斯效应的非适应性副产品,而不是对婴儿杀戮的适应. 这一发现表明,凡登伯格效应在哺乳动物中可能是不适应性的.
科学领域:
- 灵长类的繁殖策略
- 哺乳动物生殖内分泌学
- 进化生物学是进化的生物学.
背景情况:
- 范登伯格效应描述了由于新鲜的男性暴露而加速的女性成熟.
- 在Geladas中,这种效应被假设为对抗男性婴儿杀戮的适应.
- 另一种假设认为,这是布鲁斯效应 (母体自发流产) 的非适应性副产品.
研究的目的:
- 测试适应性"最佳时间假设"与非适应性"布鲁斯效应副产品假设"的适应性"最佳时间假设".
- 调查范登伯格效应的进化基础和适应意义.
主要方法:
- 对格拉达和的男性介导成熟和荷尔蒙变化的比较分析.
- 使用观测数据和理论建模 (基于个体的模型).
- 对于以男性为媒介的成熟的选择系数的推导.
主要成果:
- 在身上没有男性介导的成熟和相关的荷尔蒙变化,这是一种缺乏布鲁斯效应的物种.
- 一个基于个体的模型表明,男性介导的成熟不太可能通过格拉达或的适应性选择进化.
- 通过男性介导的成熟的选择系数可能非常小,这表明适应性益处最小.
结论:
- 结论是,格拉达的男性介导成熟是布鲁斯效应的副产品.
- 该研究认为,在更广泛的哺乳动物环境中,范登伯格效应可能是不适应性的.
- 这些发现挑战了灵长类动物中男性介导成熟的适应性解释.
相关概念视频
Natural Selection and Mating Preferences
100
The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
Females, due to their biological roles in conception, pregnancy, and nursing,...
Females, due to their biological roles in conception, pregnancy, and nursing,...
100
The Y Chromosome Determines Maleness
6.5K
The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size....
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size....
6.5K
Limits to Natural Selection
31.2K
Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
31.2K
Hardy-Weinberg Principle
72.0K
Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.
72.0K
The Ratio of X Chromosome to Autosomes
8.5K
In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
8.5K
Genetic Drift
39.6K
Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.
39.6K


