title: Alfred Russel Wallace and the destruction of island life: the Iguana tragedy.
abstract: The Galápagos Islands (Ecuador) are usually associated with the explorations and theoretical deductions of Charles Robert Darwin (1809-1882), but Alfred Russel Wallace (1823-1913) also investigated these islands and published several reports on the living world of this unique archipelago. In contrast to Darwin, Wallace described the destruction of natural ecosystems by humans and foresaw the resulting extinction of species. Here, we outline two case studies pertinent to Wallace's prediction. First, we summarize the behavior of the predator-naive marine iguanas (Amblyrhynchus cristatus) on the Galápagos Islands, which are threatened by feral dogs and cats imported by humans. We also describe the unique life cycle of the spiny-tailed iguana (Ctenosaura bakeri) from the island of Utila (Honduras), a rare species whose populations are declining because of habitat destructions. In contrast to these threatened, endemic island species, the Green iguana (Iguana iguana) is still widely distributed, although, as a result of de-forestation, in some areas of South America local populations have disappeared. We conclude that Wallace was correct in his prediction that, because of human activities, numerous species of animals and plants will be driven to extinction, notably on islands.
authors: Institute of Biology, University of Kassel, Heinrich-Plett-Str. 40, 34132, Kassel, Germany, kut@uni-kassel.de.
authors: Ulrich
authors: U
authors: Kutschera
authors: Simon
authors: S
authors: Kleinhans
mesh_terms: D000818:Animals; D005075:Biological Evolution; D001695:Biology / Q000266:history*; D017753:Ecosystem; D004484:Ecuador; D053476:Extinction, Biological; D005260:Female; D049672:History, 19th Century; D006721:Honduras; D006802:Human Activities; D006801:Humans; D007076:Iguanas / Q000502:physiology*; D058865:Introduced Species; D062312:Islands; D008297:Male; D011235:Predatory Behavior
references: Proc Biol Sci. 2007 Feb 22;274(1609):577-82
references: 17476779
references: Nature. 2008 May 1;453(7191):27
references: 18451834
references: Nature. 2005 Feb 17;433(7027):694-5
references: 15716934
references: Proc Biol Sci. 2005 Oct 7;272(1576):1985-93
references: 16191607
references: Theory Biosci. 2009 Aug;128(3):191-203
references: 19399544
references: Proc Biol Sci. 2010 Oct 22;277(1697):3157-62
references: 20504812
references: Nature. 2013 May 16;497(7449):306-8
references: 23676736
references: Biol Direct. 2011 Jun 30;6:33
references: 21714937
references: Horm Behav. 2007 Dec;52(5):653-63
references: 17904141
references: Naturwissenschaften. 2009 Nov;96(11):1247-63
references: 19756462
references: Science. 2013 Jun 14;340(6138):1287
references: 23766310