Community Structure and the Interplay between Interspecific Infection and Competition

摘要: Abstract Our motivation is the need to understand how two different interactions between species—shared infection and interspecific competition—combine determine community structure. We introduce a proto-typical model of hosts sharing pathogen also competing directly. discuss forces infection, competition invasion criteria their relevance long-term outcomes To interplay, we consider first purely competitive second infective interactions. then investigate our full establish combine combination related The do not merely add; there synergetic resistance invasion. Using generalised subsidiary conditions for feasibility stability uninfected coexistence, classify outcomes. distinguish main routes three-species coexistence. In first, host species, each which would alone support pathogen, it jointly if relatively weak, strong. second, at least one species both are invadable by other, but yield cases. one, infected coexistence results when coexist stably competitively sufficiently high densities jointly. Thus promoted weak tension favouring invadability strong promoting survival. in absence pathogen. This pathogen-mediated expected where intraspecific (lowering densities) (favouring invadibility) as necessary. Results compared with previous work apparent resource- transmission-mediated discussed.