The barnacle Balanus glandula is a broadly distributed species in the temperate northeastern Pacific that is notable for a robust genetic cline between about 36° and 40° N latitude. Prior work established the evolutionary origins of this pattern and proposed that it is maintained by environmental selection. In recent years, “climate velocity” studies in marine habitats have shown dramatic distributional shifts for many species as they track their preferred temperature range in a warming ocean. We re-sampled B. glandula across its entire geographic range to determine whether there has been any shift in this genetic distribution, a development signaling that temperature or other climate factors are maintaining this genetic cline. Additionally, we asked whether the spatially distributed mitochondrial lineages also vary in reproductive output with latitude, using location as a proxy for temperature and other coastal environmental factors. Here we show that although the distribution of the genetic cline has not appreciably changed, there is a notable association of decreased reproductive output at lower latitudes of the distribution in the “northern” lineage of B. glandula.

中文翻译：

---

藤壶龟头腺中遗传基因的维持

藤壶龟头是一种广泛分布于太平洋东北部温带的物种，以在北纬 36° 至 40° 之间的强大遗传链而著称。先前的工作确定了这种模式的进化起源，并提出它是由环境选择维持的。近年来，海洋栖息地的“气候速度”研究表明，许多物种在变暖的海洋中追踪其偏好的温度范围时发生了巨大的分布变化。我们在其整个地理范围内重新采样了腺体 B. 以确定这种遗传分布是否有任何变化，这一发展表明温度或其他气候因素正在维持这种遗传基因。此外，我们使用位置作为温度和其他沿海环境因素的代理，询问空间分布的线粒体谱系是否在生殖输出方面也随纬度而变化。在这里，我们表明，尽管遗传谱系的分布没有明显变化，但在 B. 腺体“北部”谱系分布的低纬度地区，生殖产量下降存在显着关联。