Seabird Guano Fertilizes Baltic Sea Littoral Food Webs Gagnon, Karine ; Rothäusler, Eva ; Syrjänen, Anneli ; Yli-Renko, Maria ; Jormalainen, Veijo Abstract Publication: PLoS ONE Pub Date: April 2013 DOI: 10.1371/journal.pone.0061284 Bibcode: 2013PLoSO...861284G