Data from: Environmental quality predicts optimal egg size in the wild ...

• Main Authors: Rollinson, Njal, Hutchings, Jeffrey A.
• Format: Dataset
• Language: English
• Published: Dryad 2013
• Subjects: Reproduction: investment; 2009; maternal effects; Salmo salar; Resource allocation; Life history: theory; Life history: trade offs; Atlantic salmon
• Online Access: https://dx.doi.org/10.5061/dryad.0q13g; https://datadryad.org/stash/dataset/doi:10.5061/dryad.0q13g

Parents can maximize their reproductive success by balancing the trade-off between investment per offspring and fecundity. According to theory, environmental quality influences the relationship between investment per offspring and offspring fitness, such that well-provisioned offspring fare better when environmental quality is lower. A major prediction of classic theory, then, is that optimal investment per offspring will increase as environmental quality decreases. To test this prediction, we release over 30,000 juvenile Atlantic salmon (Salmo salar) into eight wild stream environments, and we monitor subsequent growth and survival of juveniles. We estimate the shape of the relationship between investment per offspring (egg size) and offspring fitness in each stream. We find that optimal egg size is greater when the quality of the stream environment is lower (as estimated by a composite index of habitat quality). Across streams, the mean size of stream gravel and the mean amount of incident sunlight are the ... : Economy_ReleasesRelease and recapture data for juvenile Atlantic salmon released in all streams in the Economy River. See Excel file for a description of column headers.Stewiacke_ReleasesRelease and recapture data for juvenile Atlantic salmon released in streams in the Stewiacke River. See Excel file for details on column headings.GreatVillage_ReleasesRelease and recapture data for all juvenile Atlantic salmon released into streams in the Great Village River. See Excel file for a description of column headers.Growth_and_HabitatGrowth of individual Atlantic salmon juveniles recaptured from eight different streams near the Minas Basin, Nova Scotia. Habitat measurements were performed within 5 meters of each juvenile collected, and all measurements are described in the Excel file.R_Script_for_estimaing_offspring_fitness_curvesThis script can be used in R, in conjunction with the dryad data "Economy_Releases.xls", "Stewiacke_Releases.xls" and "GreatVillage_Releases.xls", to estimate the relationship between egg ...