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First, the dependence of the global dynamics on the stability type of the full extinction equilibrium point is tackled. Then, the behaviour of the total population with respect to the dispersal is studied analytically. Our findings demonstrate that diffusion plays a crucial role in the preservation of both subpopulations and the full metapopulation under the presence of stochastic perturbations. At low diffusion, the origin is a repulsor, causing the orbits to flow nearly parallel to the axes, risking stochastic extinctions. Higher diffusion turns the repeller into a saddle point. Orbits then quickly converge to the saddle\u2019s unstable manifold, reducing extinction chances. This change in the vector field enhances metapopulation robustness. On the other hand, the well-known fact that asymmetric conditions on the patches is beneficial for the total population is further investigated. This phenomenon has been studied in previous works for large enough or small enough values of the dispersal. In this work, we complete the theory for all values of the dispersal. In particular, we derive analytically a formula for the optimal value of the dispersal that maximizes the total population.<\/jats:p>","DOI":"10.1007\/s12064-023-00411-2","type":"journal-article","created":{"date-parts":[[2024,2,21]],"date-time":"2024-02-21T19:02:31Z","timestamp":1708542151000},"page":"79-95","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Optimal dispersal and diffusion-enhanced robustness in two-patch metapopulations: origin\u2019s saddle-source nature matters"],"prefix":"10.1007","volume":"143","author":[{"given":"Marc","family":"Jorba-Cusc\u00f3","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ruth I.","family":"Oliva-Z\u00faniga","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Josep","family":"Sardany\u00e9s","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel","family":"P\u00e9rez-Palau","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,2,21]]},"reference":[{"key":"411_CR1","doi-asserted-by":"publisher","first-page":"1158","DOI":"10.1111\/j.1461-0248.2011.01670.x","volume":"14","author":"K Abbott","year":"2011","unstructured":"Abbott K (2011) A dispersal-induced paradox: synchrony and stability in stochastic metapopulations. 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