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Lapā Salu bioģeogrāfija:
"Teorijai ir vairāki trūkumi, ko var uzskatīt arī par īpašiem gadījumiem:
- glābšanas efekts — atrodoties tuvāk kontinentam, izmiršanas temps ir mazāks, kā to paredz dinamiskā līdzsvara modelis, tā kā no kontinenta jaunas sugas ierodas biežāk;[nepieciešama atsauce]
- mērķa efekts — salas lielums var ietekmēt arī imigrācijas biežumu, jo sugas aktīvi izvēlas lielākas salas to resursu un pieejamo ekoloģisko nišu dēļ, vai arī lielākas salas nejauši "uzkrāj" vairāk sugas, jo tās ir lielākas.[nepieciešama atsauce]
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