Figure legends
Fig. 1. Map showing the location of regions (Northern sites = Uppland, Southern coastal sites = Kalmar, Southern inland sites = Halland). For site information see SI Table 1.
Fig. 2. Relative abundance of wolf spider species in inland and coastal sites in Halland/Kalmar (S) and in Uppland (N).
Fig. 3. Relative abundances of prey catches in SLAM-traps, separated by wrack occurrence, region (south = Kalmar, north = Uppland) and season (A = August, S = July). Detritivore flies include Sepsidae, Sphaeroceridae and Coelopidae. Other flying prey include Hymenoptera and Lepidoptera but also a range of terrestrial Diptera.
Fig. 4. Relative contents of spider guts from sites with or without wrack, and in the northern (Uppland) or southern (Kalmar) region. Other detritivore flies include those connected to wrack, such as Anthomyiidae, Coelopidae, Ephydridae and Sepsidae. Other large flies include Dolichopodidae, Dryomyzidae, Empididae, Fannidae, Heleomyzidae, Hybotidae, Muscidae, Rhinophoridae, Scatophagidae, Sciomyzidae, Syrphidae, Tabanidae and Tachinidae. Other small flies include Acroceridae, Agromyzidae, Asteiidae, Canacidae, Carnidae, Chamaemyiidae, Chloropidae, Lonchopteridae, Opomyzidae, Phoridae, and Pipunculidae. Other Nematocera include Cecidomyiidae, Ceratopogonidae, Keroplatidae, Limoniidae, Mycetophilidae, Psychodidae, Scatopsidae and Sciaridae.
Fig. 5. Species accumulation curves (±S.D.) relative to the number of sampled spiders for northern sites (Uppland) and southern sites (Kalmar), with or without wrack accumulation.
Fig. 6. Individual diet similarity estimated as Jaccards similarity index (±S.E.) separated for region (N=Uppland, S=Kalmar) and wrack presence. The diet similarity was estimated between all pairs of individuals (red) or between pairs of the same species (white) and when prey where included at the species (circles) or family (squares) level. N-values refer to the number of pairs of individuals.
Figure 1