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We study the entanglement spectrum of Heisenberg spin ladders of arbitraryspin length S in the perturbative regime of strong rung coupling. For isotropicspin coupling the the entanglement spectrum is, within first order perturbationtheory, always proportional to the energy spectrum of the single chain with aproportionality factor being also independent of S. A more complicatedsituation arises for anisotropic ladders of higher spin S>=1 since here eventhe unperturbed ground state has a nontrivial entanglement spectrum. Finally wediscuss related issues in dimerized spin chains.

Entanglement Spectra of Heisenberg Ladders of higher Spin