title: Survival in an extreme habitat: the roles of behaviour and energy limitation.
abstract: Extreme habitats challenge animals with highly adverse conditions, like extreme temperatures or toxic substances. In this paper, we report of a fish (Poecilia mexicana) inhabiting a limestone cave in Mexico. Several springs inside the cave are rich in toxic H(2)S. We demonstrate that a behavioural adaptation, aquatic surface respiration (ASR), allows for the survival of P. mexicana in this extreme, sulphidic habitat. Without the possibility to perform ASR, the survival rate of P. mexicana was low even at comparatively low H(2)S concentrations. Furthermore, we show that food limitation affects the survival of P. mexicana pointing to energetically costly physiological adaptations to detoxify H(2)S.
authors.affiliation: Unit of Evolutionary Biology and Systematic Zoology, Institute of Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Strasse 24-25, Potsdam, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Plath
authors.forename: Michael
authors.initials: M
authors.lastname: Tobler
authors.forename: Rüdiger
authors.initials: R
authors.lastname: Riesch
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: García de León
authors.forename: Olav
authors.initials: O
authors.lastname: Giere
authors.forename: Ingo
authors.initials: I
authors.lastname: Schlupp
mesh_terms: D000821:Animal Feed; D000818:Animals; D001522:Behavior, Animal; D002980:Climate; D017753:Ecosystem; D004734:Energy Metabolism; D008800:Mexico; D010101:Oxygen Consumption; D011036:Poecilia / Q000502:physiology*; D011156:Population Density; D012623:Seawater