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Recent measurements of the spectrum and composition of ultrahigh energycosmic rays suggest that their extragalactic sources may be accelerating heavynuclei in addition to protons. This can suppress the cosmogenic neutrino fluxrelative to the usual expectation for an all-proton composition. Cosmicneutrino detectors may therefore need to be even larger than currently plannedbut conversely they will also be able to provide valuable informationconcerning astrophysical accelerators. Moreover measurement of ultrahigh energycosmic neutrino interactions can provide an unique probe of QCD dynamics athigh parton density.

Implications of cosmic ray results for UHE neutrinos