Waiting for the snow to melt…
A survey of approximately 60 ponds in the Gunnison Basin, Gunnison and Pitkin counties, Colorado, U.S.A., showed a cor- relation between the thermal ranges of the ponds and the life history pattern of Ambystoma tigrinum populations. Characterization of physical and biotic parameters allowed a ranking of ponds from warm to cool, verified by temperature data taken through two warm seasons (1974 and 1975). The life history pattern of the salamander populations was deter- mined on the basis of the number of size classes of salamanders observed in the pond. A model is proposed relating the thermal regimes of the pond and the observed life history pattern of the salamanders. Three life history patterns are defined for these populations: standard life his- tory, only one size class of larvae; neotenic life history, two size classes of larvae with metamorphosis occurring in the second warm season; and neotenic and paedogenic life histories, three or four size classes of larvae with metamorphosis occurring the the third or later warm season.
Knowledge graph centered on Life history patterns of Ambystoma tigrinum in mon with 9 nodes and 15 connections. Top connected: Ambystoma mavortium, Possible effects of acidic deposition on a Rocky M, Consumptive and nonconsumptive effects of cannibal, Growth rates and size at metamorphosis of high ele, Maintenance of polymorphism promoted by sex-specif.
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