Population cycles caused by overcompensating density-dependence in an annual plant

Oecologia ◽  
1986 ◽  
Vol 71 (1) ◽  
pp. 156-158 ◽  
Author(s):  
E. Symonides ◽  
J. Silvertown ◽  
V. Andreasen
Keyword(s):  
Density Dependence ◽  
Population Cycles ◽  
Annual Plant

scholarly journals Population Cycles Produced by Delayed Density Dependence in an Annual Plant

2006 ◽  
Vol 168 (3) ◽  
pp. 318
Author(s):  
Gonzalez-Andujar ◽  
Fernandez-Quintanilla ◽  
Navarrete
Keyword(s):  
Density Dependence ◽  
Population Cycles ◽  
Annual Plant ◽  
Delayed Density Dependence

scholarly journals Population Cycles Produced by Delayed Density Dependence in an Annual Plant

2006 ◽  
Vol 168 (3) ◽  
pp. 318-322 ◽  
Author(s):  
J. L. Gonzalez‐Andujar ◽  
C. Fernandez‐Quintanilla ◽  
L. Navarrete
Keyword(s):  
Density Dependence ◽  
Population Cycles ◽  
Annual Plant ◽  
Delayed Density Dependence

Population dynamics of muskrats and mink: investigating contemporary patterns in a classic predator-prey system

2021 ◽  
Author(s):  
Adam A Ahlers ◽  
Timothy P Lyons ◽  
Edward J Heske
Keyword(s):  
United States ◽  
Population Dynamics ◽  
Density Dependence ◽  
American Mink ◽  
Population Cycles ◽  
The United States ◽  
Parameter Estimates ◽  
Predator Prey ◽  
Cycle Lengths ◽  
Southern Half

A well-studied predator-prey relationship between American mink (Neovison vison (Schreber, 1777)) and muskrats (Ondatra zibethicus (Linnaeus, 1766)) in Canada has advanced our understanding of population cycles including the influence of density dependence and lagged responses of predators to prey abundances. However, it is unclear if patterns observed in Canada extend across the southern half of their native range. We used data from the United States to create a 41-year time series of mink and muskrat harvest reports (1970-2011) for 36 states. After controlling for pelt-price effects, we used 2nd order autoregressive and Lomb-Scargle spectral density models to identify the presence and periodicity of muskrat population cycles. Additionally, we tested for evidence of delayed or direct density dependence and for predator-driven population dynamics. Our results suggest muskrat populations may cycle in parts of the United States; however, results varied by modeling approaches with Lomb-Scargle analyses providing more precise parameter estimates. Observed cycle lengths were longer than expected with weak amplitudes and we urge caution when interpreting these results. We did not detect evidence of a predator-prey relationship driven by a lagged numerical response of American mink. American mink and muskrat fur returns were largely correlated across the region suggesting extraneous factors likely synchronize both populations.

Geographic variation in population cycles of Canadian muskrats (Ondatra zibethicus)

2000 ◽  
Vol 78 (6) ◽  
pp. 1009-1016 ◽  
Author(s):  
John Erb ◽  
Nils Chr. Stenseth ◽  
Mark S Boyce
Keyword(s):  
Density Dependence ◽  
Trophic Interactions ◽  
Dynamic Properties ◽  
Population Cycles ◽  
Period Length ◽  
Ondatra Zibethicus ◽  
Delayed Density Dependence ◽  
Relative Contribution ◽  
Arctic Regions ◽  
Harvest Data

We investigated the dynamic properties of population cycles in Canadian muskrats (Ondatra zibethicus). Ninety-one historic time series of muskrat-harvest data obtained from the Hudson's Bay Company Archives were analyzed. Most series were 25 years in length (1925–1949) and were distributed primarily throughout five ecozones. For each series, we estimated period length and coefficients for a second-order autoregressive model. Estimated period length varied between 3 and 13 years, with 3- to 5-year periods located in Subarctic-Arctic ecozones. We hypothesize that the 4-year cycles are largely a result of predation by red fox (Vulpes vulpes), which exhibit 4-year cycles in Arctic regions. The remaining ecozones generally averaged 8–9 years in period length. However, the relative contributions of direct and delayed density dependence varied along a latitudinal gradient. We hypothesize that both social and trophic interactions are necessary to produce the observed dynamics, but that shifts in the nature of mink predation were responsible for the changes in the relative contribution of direct and delayed density dependence. Essentially, there is a tension between population-intrinsic and trophic interactions that may bound the length of the cycle.

A MODEL FOR ANNUAL PLANT DYNAMICS WITH SEED BANK AND DENSITY-DEPENDENT EFFECTS

1995 ◽  
Vol 03 (02) ◽  
pp. 531-541 ◽  
Author(s):  
MOHAMED KHALADI ◽  
MARC JARRY ◽  
MARTINE HOSSAERT-MCKEY
Keyword(s):  
Density Dependence ◽  
Seed Bank ◽  
Germination Rate ◽  
Linear Matrix ◽  
Annual Plant ◽  
Potential Fecundity ◽  
Change Of Variables ◽  
Seed Mortality ◽  
Complicated Model ◽  
Conditions Of Stability

A model is proposed for the population dynamics of an annual plant with a seed bank (i.e. in which a proportion of seeds remain dormant for at least one year). In this model, demographic parameters (dormancy and germination rate) of the seeds of the year are different from those of the seeds of the seed bank. First, a simple linear matrix model is deduced from the life cycle graph and a more complicated model is built by introducing density dependence effect. The obtained system, nonlinear with delay, can be simplified by a change of variables. A non-trivial fixed point of this system is obtained and the conditions of stability are studied. Under certain conditions (choice of exponential law for functional response of density dependence and absence of seed mortality before germination) we show that conditions of stability depend only on 3 parameters, the dormancy rate of the seeds of the year, dormancy rate of the seeds of the seed bank and the maximum potential fecundity of adults. Study of the behaviour of this model in the parameter space shows that the domain of demographic stability can be reduced if the dormancy rate of seeds of the year is low, even if the dormancy rate of seeds of the seed bank is high.

scholarly journals Seasonality, density dependence, and population cycles in Hokkaido voles

2003 ◽  
Vol 100 (20) ◽  
pp. 11478-11483 ◽  
Author(s):  
N. C. Stenseth ◽  
H. Viljugrein ◽  
T. Saitoh ◽  
T. F. Hansen ◽  
M. O. Kittilsen ◽  
...  
Keyword(s):  
Density Dependence ◽  
Population Cycles

scholarly journals DENSITY DEPENDENCE IN AN ANNUAL PLANT COMMUNITY: VARIATION AMONG LIFE HISTORY STAGES

2001 ◽  
Vol 71 (3) ◽  
pp. 423-446 ◽  
Author(s):  
Deborah E. Goldberg ◽  
Roy Turkington ◽  
Linda Olsvig-Whittaker ◽  
Andrew R. Dyer
Keyword(s):  
Life History ◽  
Density Dependence ◽  
Plant Community ◽  
Annual Plant ◽  
Life History Stages ◽  
Community Variation

scholarly journals A fitness trade-off between seasons causes multigenerational cycles in phenotype and population size

eLife ◽  
2017 ◽  
Vol 6 ◽  
Author(s):  
Gustavo S Betini ◽  
Andrew G McAdam ◽  
Cortland K Griswold ◽  
D Ryan Norris
Keyword(s):  
Population Dynamics ◽  
Life History ◽  
Body Size ◽  
Natural Selection ◽  
Density Dependence ◽  
Seasonal Changes ◽  
Population Cycles ◽  
Trade Off ◽  
Viability Selection ◽  
Trade Offs

Although seasonality is widespread and can cause fluctuations in the intensity and direction of natural selection, we have little information about the consequences of seasonal fitness trade-offs for population dynamics. Here we exposed populations of Drosophila melanogaster to repeated seasonal changes in resources across 58 generations and used experimental and mathematical approaches to investigate how viability selection on body size in the non-breeding season could affect demography. We show that opposing seasonal episodes of natural selection on body size interacted with both direct and delayed density dependence to cause populations to undergo predictable multigenerational density cycles. Our results provide evidence that seasonality can set the conditions for life-history trade-offs and density dependence, which can, in turn, interact to cause multigenerational population cycles.

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