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The stability of steady states and the existence of local Hopf bifurcation are obtained by analyzing the distribution of eigenvalues. And the global existence of positive periodic solutions is established by using the global Hopf bifurcation result given by Wu [1996]. Finally, some numerical simulations are carried out to illustrate the analytical results. <\/jats:p>","DOI":"10.1142\/s0218127421501145","type":"journal-article","created":{"date-parts":[[2021,6,28]],"date-time":"2021-06-28T08:18:33Z","timestamp":1624868313000},"page":"2150114","source":"Crossref","is-referenced-by-count":4,"title":["Global Hopf Bifurcation in a Phytoplankton\u2013Zooplankton System with Delay and Diffusion"],"prefix":"10.1142","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1861-1315","authenticated-orcid":false,"given":"Ming","family":"Liu","sequence":"first","affiliation":[{"name":"Northeast Forestry University, Harbin, Heilongjiang 150040, P. R. 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