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Does breeding ecology alter selection on developmental and life history traits? A case study in two Ambystomatid salamanders

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Does breeding ecology alter selection on developmental and life history traits? A case study in two Ambystomatid salamanders

Content Provider	Springer Nature Link
Author	Hale, Rebecca E. Miller, Natrieifia Francis, Robert A. Kennedy, Caroline
Copyright Year	2016
Abstract	Terrestrial breeding with extended incubation has evolved repeatedly in fishes and amphibians but raises challenges for embryos, which must conserve sufficient yolk to continue development until water is available. One means of avoiding premature yolk consumption is for embryos to slow their development such that yolk is consumed more slowly. However slower development is associated with smaller adult body sizes and lower survivorship, particularly in amphibians occupying ephemeral habitats. The variable breeding strategies of Ambystomatid salamanders provide an excellent system in which to examine whether variation in breeding ecology is associated with divergence in embryonic development. Phylogenies of Ambystoma strongly support aquatic egg-laying and winter breeding as ancestral. Early breeding has evolved in three species and terrestrial breeding in two of the three. We propose that early, terrestrial breeding has altered selection on embryonic development. In particular, we propose that the prolonged incubation typically associated with early, terrestrial breeding has selected for longer development times. We compared embryonic development of the terrestrial breeding Ambystoma opacum (Gravenhorst 1807) with the co-occuring, aquatic breeding Ambystoma maculatum (Shaw 1802) under a range of laboratory conditions over two breeding seasons. We found that A. opacum embryos took longer to develop and hatched at a later stage, consistent with the hypothesis that early, terrestrial breeding favors embryos that extend development.
Starting Page	503
Ending Page	517
Page Count	15
File Format	PDF
ISSN	02697653
Journal	Evolutionary Ecology
Volume Number	30
Issue Number	3
e-ISSN	15738477
Language	English
Publisher	Springer International Publishing
Publisher Date	2016-01-25
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ambystoma opacum Ambystoma maculatum Embryo Developmental dependence Dissolved oxygen Life histories Evolutionary Biology Ecology Plant Sciences Animal Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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Does breeding ecology alter selection on developmental and life history traits? A case study in two Ambystomatid salamanders

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Does breeding ecology alter selection on developmental and life history traits? A case study in two Ambystomatid salamanders