Figure 5
From: Trophic ecology of glass sponge reefs in the Strait of Georgia, British Columbia
Survey of natural levels of δ13C and δ15N (‰) of sponges, particulate organic matter, and sediments from several glass sponge reefs. (a) Four different locations were sampled to determine natural isotope signatures: Fraser Reef (F), Galiano Reef (G), Howe Sound (H), and sponges found outside of the Strait of Georgia (denoted as ‘coastal’), either in Barkley Sound (B) or off the coast of Washington (W). Map was generated using ESRI ArcMap 10.363 (http://www.esri.com/). (b) Stable isotope signatures of sponge tissues from different reefs and across different years (sampling year denoted by the final two digits). (c) Stable isotope signatures of particulate organic matter (POM, ●), sponge tissues (▲), and sediments (■) from Fraser Reef (orange), Howe Reef (yellow), Galiano Reef (light blue), and coastal sponges (dark blue). Sponge isotope data collected from the same reef are aggregated across years. Error bars: standard deviation.
