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Oecologia (2003) 136:4650 DOI 10.1007/s00442-003-1248-x
 

Summary: Oecologia (2003) 136:4650
DOI 10.1007/s00442-003-1248-x
P O P U L A T I O N E C O L O G Y
Res Altwegg
Multistage density dependence in an amphibian
Received: 5 August 2002 / Accepted: 8 March 2003 / Published online: 17 April 2003
Springer-Verlag 2003
Abstract Density dependence is the major process
keeping the sizes of natural populations within bounds.
In organisms with complex life cycles, the stage at which
density dependence occurs and whether it occurs in one or
several life stages have important consequences for the
dynamics of their populations. I manipulated density of
pool frogs (Rana lessonae) during the aquatic larval and
the terrestrial juvenile stages and examined the effect on
growth and survival until 1 year of age. High larval
density, but not high juvenile density, led to smaller size
at this age. Both larval and juvenile density led to reduced
growth during the early juvenile stage, but the effect of
the larval density appeared stronger than the effect of

  

Source: Altwegg, Res - Avian Demography Unit, Department of Statistical Sciences, University of Cape Town

 

Collections: Environmental Sciences and Ecology