Interactions of Intraspecific, Interspecific, and Apparent Competition with Host-Pathogen Population Dynamics

Ecology ◽  
1992 ◽  
Vol 73 (2) ◽  
pp. 507-514 ◽  
Author(s):  
Edwin D. Grosholz
Keyword(s):  
Population Dynamics ◽  
Apparent Competition ◽  
Pathogen Population ◽  
Host Pathogen

Host-Pathogen Population Dynamics, Basic Reproductive Rates and Threshold Densities

Oikos ◽  
1998 ◽  
Vol 81 (2) ◽  
pp. 299 ◽  
Author(s):  
Robert J. Knell ◽  
Michael Begon ◽  
David J. Thompson
Keyword(s):  
Population Dynamics ◽  
Pathogen Population ◽  
Host Pathogen ◽  
Reproductive Rates

More Modules

2011 ◽  
Author(s):  
Kevin S. McCann
Keyword(s):  
Population Dynamics ◽  
Food Webs ◽  
Empirical Evidence ◽  
Intraguild Predation ◽  
Weak Interactions ◽  
Apparent Competition ◽  
Trade Offs ◽  
Variable Population ◽  
The Stability

This chapter considers four-species modules and the role of generalism (effectively a three-species module with a consumer feeding on two resources). It first examines how generalists affect the dynamics of food webs by focusing on a set of modules that contrast generalist consumer dynamics relative to the specialist case. It then discusses organismal trade-offs that play a role in governing the diamond food web module and the intraguild predation module, arguing that such tradeoffs influence the flux of matter, the organization of interaction strengths, and ultimately the stability of communities. The chapter also reviews empirical evidence showing that apparent competition and the diamond module with and without intraguild predation are ubiquitous, and that weak interactions in simple modules seem to promote less variable population dynamics.

scholarly journals Host–pathogen coevolution, secondary sympatry and species diversification

2010 ◽  
Vol 365 (1543) ◽  
pp. 1139-1147 ◽  
Author(s):  
Robert E. Ricklefs
Keyword(s):  
Apparent Competition ◽  
Allopatric Speciation ◽  
Similar Reasoning ◽  
Species Diversification ◽  
Darwin's Finches ◽  
Hawaiian Honeycreepers ◽  
Darwin’S Finches ◽  
Host Pathogen

The build-up of species locally within a region by allopatric speciation depends on geographically separated (allopatric) sister populations becoming reproductively incompatible followed by secondary sympatry. Among birds, this has happened frequently in remote archipelagos, spectacular cases including the Darwin's finches (Geospizinae) and Hawaiian honeycreepers (Drepanidinae), but similar examples are lacking in archipelagos nearer to continental landmasses. Of the required steps in the speciation cycle, achievement of secondary sympatry appears to be limiting in near archipelagos and, by extension, in continental regions. Here, I suggest that secondary sympatry might be prevented by apparent competition mediated through pathogens that are locally coevolved with one population of host and are pathogenic in sister populations. The absence of numerous pathogens in remote archipelagos might, therefore, allow sister populations to achieve secondary sympatry more readily and thereby accelerate diversification. By similar reasoning, species should accumulate relatively slowly within continental regions. In this essay, I explore the assumptions and some implications of this model for species diversification.

Sign in / Sign up

Export Citation Format

Share Document