The Young, the Weak and the Sick: Evidence of Natural Selection by Predation Genovart, Meritxell ; Negre, Nieves ; Tavecchia, Giacomo ; Bistuer, Ana ; Parpal, Luís ; Oro, Daniel Abstract Publication: PLoS ONE Pub Date: March 2010 DOI: 10.1371/journal.pone.0009774 Bibcode: 2010PLoSO...5.9774G