Historical warming consistently decreased size, dispersal and speciation rate of fish

There is ongoing debate as to whether fish body size will decrease with global warming and how these changes may impact dispersal ability speciation rate. Theory predicts that, under warmer temperatures, grow a smaller size, undergo reduction in increase rates. However, evaluations of such predictions are hampered owing the lack empirical data spanning both wide temporal geographical scales. Here, using phylogenetic methods, we show that clupeiform (anchovies herrings) occurred historically waters, moved shortest distances at low speed displayed lowest Furthermore, faster evolved rapidly higher rates temperature change but historical far lower than current Our results predict future where have reduced move be more prevalent; this, turn, reduce speciation. Phylogenetic over past ~150 million years shorter had Fish quicker periods rapid change, implications for movement survival climate change.