Herbivore Population Dynamics in Intertidal Marshlands: The Role of Host Plant Nutrition

  • Robert F. Denno


Several researchers in population dynamics have attempted to predict when insects will migrate based on changes in habitat quality. Several very general models have been proposed (Southwood, 1962, 1977; Solbreck, 1978; Denno and Grissell, 1979). Solbreck’s (1978) model discusses an environment containing an archipelago of habitat patches variable in time and space and an insect which may respond with either immediate reproduction, migration, or diapause (Figure 44.1). For an insect to develop the appropriate strategy, it needs information concerning environmental variability in both spatial and temporal dimensions. Consequently, information is needed about the future quality of the immediate resource here, as well as the future quality of alternative patches elsewhere. Selection will make the appropriate life history decision.


High Marsh Brown Planthopper Spartina Alterniflora Estuarine Wetland Host Plant Quality 
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© Donal D. Hook 1988

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  • Robert F. Denno

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