DOI: 10.5061/dryad.pq35t
title: Data from: Increases in the mean and variability of thermal regimes result in differential phenotypic responses among genotypes during early ontogenetic stages of lake sturgeon (Acipenser fulvescens)

description: Climate change is affecting thermal conditions worldwide. Understanding
 organismal responses associated with predicted changes are essential for
 predicting population persistence. Few studies have examined the effects
 of both increased mean and variance in temperature on organismal traits,
 particularly during early life stages. Using lake sturgeon (Acipenser
 fulvescens) from Black Lake, MI, we tested whether phenotypic variation
 differed among families reared in two constant (10 and 18°C) and two
 fluctuating temperature treatments (10-19°C) representing temperatures
 experienced in the river and a simulated anthropogenic disturbance. Body
 length, body area, and yolk-sac area were quantified at hatch.
 Family-by-treatment interactions explained up to 50% of the variance
 observed among families in offspring hatch traits. Families incubated in
 18°C and the fluctuating anthropogenic treatment had 6-10 times higher
 variance in traits than those incubated at 10°C. Hatched larvae were
 placed in raceways with ambient river water. Emergence body length,
 emergence timing, and growth were quantified upon emergence. Families
 differed in time to emergence and growth with the greatest range observed
 in the 18°C treatment. Results demonstrate that differential responses
 among genotypes to changes in the mean and variability of thermal
 incubation regimes can affect traits at hatch as well as a subsequent
 ontogenetic stage.
description: Thermal Hatch Data
 FileFile contains data for
 the 1200 larvae measured at hatch. Data includes individual ID codes,
 thermal incubation treatment the individual incubated in from egg to
 hatch, family code (each code represents a cross between 1 female and 1
 male; families were half-sibling groups with one female crossed with two
 males therefore the half-sib groups include A and B, C and D, E and F, G
 and H, and I and J), and measurements for the three phenotypic traits
 quantified at hatch: body length (mm), body area (mm), and yolk-sac area
 (mm^2). Note: Thermal incubation treatments were coded as A=Warm,
 B=Variable, C=Ambient, and D=Cold prior to analysis of the
 data.thermalhatchdata.csvThermal Emergence Data FileFile contains data for the 303 larvae measured at the time of emergence and corresponds to the same individual ID numbers, incubation treatments, and family codes as the hatch data file. Data includes individual ID codes, thermal incubation treatment the individual incubated in from egg to hatch, family code (each code represents a cross between 1 female and 1 male; families were unrelated), measurements for the three phenotypic traits quantified at the time of emergence: time to emergence (days), emergence body length (mm), and total growth from hatch to emergence (mm), and estimates for the mean temperature (MeanT) and Degree Days each individual experienced in the rearing chambers within the raceways from hatch until the timing of emergence. Note: Thermal incubation treatments were coded as A=Warm, B=Variable, C=Ambient, and D=Cold prior to analysis of the data.thermalemergencedata.csv