Data and code from: Urban-driven homogenization of aquatic subsidy size structure cascades to riparian predator communities

The export of emergent aquatic insects is a critical energy subsidy for
terrestrial food webs. While urbanization is known to alter stream
communities, its effects on the size structure of these subsidies and the
consequences for riparian predators remain poorly understood. This dataset
was generated to investigate how impervious land cover affects the
body-size distribution of emergent aquatic insects and, in turn, the
community structure and diet of riparian spiders along two urban streams
in Québec, Canada. The data package contains comprehensive information
linking environmental drivers to community and trophic responses. The data
package contains comprehensive information linking environmental drivers
to community and trophic responses, organized into several files. It
includes detailed data on emergent aquatic insect communities, featuring
family-level identification, abundance counts, and individual body length
measurements (mm) for thousands of specimens collected from floating
emergence traps. The dataset also provides abundance counts of riparian
spider families (e.g., Tetragnathidae) and other terrestrial arthropods
collected using the beating sheet method. These biological data are
contextualized by site-specific watershed characteristics, such as the
proportion of impervious cover and distance from upstream derived from GIS
analysis, alongside a suite of in-situ physicochemical water quality
measurements (temperature, pH, conductivity, turbidity, and continuous
dissolved oxygen). Finally, trophic connections are detailed through raw
stable isotope values (δ13C and δ15N) for the primary consumer
(Tetragnatha spiders) and their potential aquatic and terrestrial food
sources.