Data from: The leading edge matters too: fitness and the expression of adaptive differentiation are greatest at the high-elevation edge of a species range

This dataset contains raw and processed data from two common garden
experiments testing local adaptation and fitness variation across the
elevational range of Erythranthe laciniata (Phrymaceae), an annual
monkeyflower endemic to the Sierra Nevada, California, USA. Experiments
were conducted in 2009 and 2021 at low-, mid-, and high-elevation field
gardens spanning the species’ distribution. The dataset includes survival
and lifetime fitness measurements (total flower number), population and
maternal line identifiers, geographic coordinates, elevation, climate data
(NASA Daymet), and associated metadata. These data support analyses
presented in Shay & Pennington et al. (2025), The leading edge
matters too: fitness and the expression of adaptive differentiation are
greatest at the high-elevation edge of a species’ range (Ecology Letters).