Adaptive divergence in reproductive seasonality and underlying physiological features fit Rattus norvegicus to live as opportunistic breeders

文献类型： 外文期刊

第一作者： Li, Xixuan

作者： Li, Xixuan;Li, Ning;Song, Ying;Wang, Dawei;Liu, Xiaohui;Yao, Dandan;Feng, Zhiyong;Wang, Dawei;Liu, Yu;Wang, Dawei;Liu, Xiaohui

作者机构：

关键词： adaptation; brown rat; gonadal development; photoperiod; temperature; testis

期刊名称：INTEGRATIVE ZOOLOGY （ 影响因子：3.7； 五年影响因子：3.0 ）

ISSN： 1749-4877

年卷期： 2025 年 20 卷 4 期

页码：

收录情况： SCI

摘要： How organisms respond to complex environments is one of the unsolved problems in ecology. Life history patterns of a species provide essential information on how different populations may respond and adapt to environmental changes. Compared to typical seasonal breeders, which have limited distributions, the worldwide distribution of brown rats (Rattus norvegicus) across highly complex and divergent habitats suggests they exhibit exceptional adaptiveness. However, the difference in physiological mechanisms by which brown rats respond and adapt to markedly different environments is seldom investigated. Here, we reveal a significant divergence in reproductive seasonality and environmental responses between two brown rat subspecies: one subspecies, R. n. caraco, lives in the temperate zone, and another subspecies, R. n. norvegicus, lives in the subtropical region. Although R. n. caraco displayed a significantly higher reproductive seasonality than R. n. norvegicus, both subspecies adapted to sub-optimal breeding conditions mainly by regulating the seminal vesicle rather than testis development. Especially in responding to severe winter conditions in high-latitude regions, bodyweight-dependent recovery of testicular development in adults enables R. n. caraco to initiate reproduction more rapidly when conditions are suited. These findings elucidate a regulatory process of how brown rats live as opportunistic breeders by benefiting from enhanced semen production.

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