Ectotherm size- and age-at-maturity in a warmer, variable, and resource-poor world

This dataset supports a study investigating how nutritional quality and thermal variability jointly affect individual growth and maturation in Daphnia magna. It includes the full R implementation of a Dynamic Energy Budget (DEB) model parameterised for D. magna, in which the average temperature, the amplitude of thermal fluctuations, and both the quantity and quality of food can be modified by the user. The dataset also contains empirical measurements from standardized growth experiments conducted under multiple combinations of temperature regimes (varying means and amplitudes), food quantity, and nutritional quality. The DEB model predicts age and size at maturity across several environmental scenarios. Experimental data were used to validate model accuracy and parameterization under different thermal and trophic conditions. Model scripts include complete annotation, flexible parameter settings, and tools for simulating growth trajectories and extracting key life-history metrics. These..., , , # Ectotherm size- and age-at-maturity in a warmer, variable, and resource-poor world

[https://doi.org/10.5061/dryad.xgxd254sf](https://doi.org/10.5061/dryad.xgxd254sf)

## Description of the data and file structure

Experimental data were obtained through laboratory experiments involving multiple crossed factors: temperature (20 or 28°C), temperature variance (no variance or ±5°C around the mean temperature), nutritional quality (high or low), and food quantity (0.4 or 3 mgC/L) on *Daphnia magna*. The mass of the organisms was measured using a precision microbalance, while their size and the number of eggs were determined under a stereomicroscope.

For the theoretical part, the model is based on the principles of the Dynamic Energy Budget (DEB) theory.

### Files and variables

#### File: script.zip

**Description:** Two repositories are present. First, there is the repository DEB_model, which contains three scripts involving the bioenergetic model we established in R. To run the model...,