Acartia tonsa prosome length measurements in 2019 during a common garden split-brood experiment several generations after copepod collection in Long Island Sound in summer and fall of 2019

Copepods with short generation times experience seasonal environmental variation across, rather than within, generations. This data includes body size measurements for both male and female individuals from seasonal collections of Acartia tonsa from Eastern Long Island Sound in Summer and Fall 2019. The body size measurements in this dataset were made during a common garden split-brood experiment with the 2019 collections, after several generations of common garden acclimation. The observed variation in size can therefore be attributed to the effects of both genetic variation and phenotypic plasticity. Data were collected by Dr. Matthew Sasaki at the University of Connecticut.