Eelgrass (Zostera marina L.) populations are threatened by high sea-surface temperatures and impaired waters on Nantucket Island, USA.

Eelgrass (Zostera marina L.) is a key foundation species that provides multiple ecosystem services to shallow coastal and estuarine systems in the Northern Hemisphere. It is estimated that, over the last century, up to 50 % of all Z.

Temporal dietary shift in jellyfish revealed by stable isotope analysis.

A temporal change in the stable isotope (SI) composition of jellyfish in the Kiel Fjord, Western Baltic Sea, was documented by analyzing δC, δN and δS of bell tissue of and in the period between June and October 2011. A strong and significant temporal change in all SI values of was found, including an increase of ~3 ‰ in δC, a decrease of ~4 ‰ in δN and sharp decline of ~7 ‰ in δS. While knowledge gaps in jellyfish isotope ecology, in particular the lack of reliable trophic enrichment factors, call for a conservative interpretation of our data, observed changes in particular in δS, as indicated by means of a MixSIR mixing model, would be consistent with a temporal dietary shift in from mesozooplankton (>150 µm) to microplankton and small re-suspended particles (0.