scholarly journals Size-Dependent Population Dynamics of Microtus ochrogaster

1986 ◽  
Vol 127 (6) ◽  
pp. 902-908 ◽  
Author(s):  
John R. Sauer ◽  
Norman A. Slade
Keyword(s):  
Population Dynamics ◽  
Microtus Ochrogaster ◽  
Size Dependent

Home Range Size and Population Dynamics in the Prairie Vole, Microtus Ochrogaster

Oikos ◽  
1982 ◽  
Vol 39 (1) ◽  
pp. 63 ◽  
Author(s):  
Michael S. Gaines ◽  
Michael L. Johnson
Keyword(s):  
Population Dynamics ◽  
Home Range ◽  
Home Range Size ◽  
Prairie Vole ◽  
Range Size ◽  
Microtus Ochrogaster

scholarly journals Size-by-environment interactions: a neglected dimension of species’ responses to environmental variation

2018 ◽  
Author(s):  
Andrew T. Tredennick ◽  
Brittany J. Teller ◽  
Peter B. Adler ◽  
Giles Hooker ◽  
Stephen P. Ellner
Keyword(s):  
Population Dynamics ◽  
Functional Form ◽  
Survival Rates ◽  
Vital Rate ◽  
Vital Rates ◽  
Size Dependent ◽  
Fluctuating Environments ◽  
The Impact ◽  
The Relationship

AbstractIn both plant and animal systems, size can determine whether an individual survives and grows under different environmental conditions. However, it is less clear whether and when size-dependent responses to the environment affect population dynamics. Size-by-environment interactions create pathways for environmental fluctuations to influence population dynamics by allowing for negative covariation between sizes within vital rates (e.g., small and large individuals have negatively covarying survival rates) and/or size-dependent variability in a vital rate (e.g., survival of large individuals varies less than small individuals through time). Whether these phenomena affect population dynamics depends on how they are mediated by elasticities (they must affect the sizes and vital rates that matter) and their projected impacts will depend on model functional form (the impact of reduced variance depends on the relationship between the environment and vital rate). We demonstrate these ideas with an analysis of fifteen species from five semiarid plant communities. We find that size-by-environment interactions are common but do not impact long-term population dynamics. Size-by-environment interactions may yet be important for other species. Our approach can be applied to species in other ecosystems to determine if and how size-by-environment interactions allow them to cope with, or exploit, fluctuating environments.

scholarly journals Local existence for a general model of size-dependent population dynamics

1997 ◽  
Vol 2 (3-4) ◽  
pp. 207-226 ◽  
Author(s):  
Nobuyuki Kato ◽  
Hiroyuki Torikata
Keyword(s):  
Growth Rate ◽  
Population Dynamics ◽  
Initial Data ◽  
Continuous Dependence ◽  
Local Existence ◽  
Local Solution ◽  
Size Dependent ◽  
Structured Population ◽  
Structured Population Dynamics ◽  
Uniqueness Of The Solution

We shall investigate a size structured population dynamics with aging and birth functions having general forms. The growth rate we deal with depends not only on the size but also on time. We show the existence of a local solution and continuous dependence on the initial data, which shows the uniqueness of the solution as well.

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