Data for fish reproductive phenology shifts with increasing temperature and year

<p>We applied a meta-analysis approach to test whether increasing annual temperature and year affected fish reproductive phenology. Based on preliminary tests pre-existing of walleye (<em>Sander vitreus</em>) and Lake Constance whitefish (<em>Coregonus arenicolus</em>) agency datasets, we hypothesized that increasing temperature would promote earlier spring-spawning, and later fall-spawning. We found significantly earlier spawning in the spring and later spawning in the fall. We also found that migration timing of fall-spawning species occurred earlier with warmer temperatures, implying that with increasing temperatures, migrating fall-spawning species will increase residence time in tributaries. We also found that spring-spawning fishes reproduced earlier in more recent years of our dataset, and we observed no significant effect in fall-spawners. Spring- and fall-spawning fishes displayed variation in reproductive phenology (mean range of 34.4 and 27.0 days over 33.9 years, respectively), and spring-spawning fishes displayed a significantly broader range in spawning dates.</p>