Concentration through large advection Articles uri icon

authors

  • GONZALEZ DE LA ALEJA GALLEGO, DAVID
  • LOPEZ-GOMEZ, J.

publication date

  • November 2014

start page

  • 3135

end page

  • 3164

issue

  • 9

volume

  • 257

International Standard Serial Number (ISSN)

  • 0022-0396

Electronic International Standard Serial Number (EISSN)

  • 1090-2732

abstract

  • In this paper we extend the elegant results of Chen, Lam and Lou [6, Section 2], where a concentration phenomenon was established as the advection blows up, to a general class of adventive-diffusive generalized logistic equations of degenerate type. Our improvements are really sharp as we allow the carrying capacity of the species to vanish in some subdomain with non-empty interior. The main technical devices used in the derivation of the concentration phenomenon are Proposition 3.2 of Cano-Casanova and López-Gómez [5], Theorem 2.4 of Amann and López-Gómez [1] and the classical Harnack inequality. By the relevance of these results in spatial ecology, complete technical details seem imperative, because the proof of Theorem 2.2 of [6] contains some gaps originated by an "optimistic" use of Proposition 3.2 of [5]. Some of the general assumptions of [6] are substantially relaxed.

keywords

  • advection; concentration; diffusion; generalized logistic; primary; secondary