The distribution in time and space of parasitism in <i>Epinotia tedella</i> (CI.) (Lepidoptera: Tortricidae)

Münster‐Swendsen, Mikael

doi:10.1111/j.1365-2311.1980.tb01161.x

Cited by 16 publications

(6 citation statements)

References 10 publications

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“…6 and 7). Recent detailed population studies on other herbivorous insects have revealed the effects of such seasonal variability ("temporal window") of arthropod predators or parasitoids on the population dynamics of the prey or host (e.g., Miinster-Swendsen 1980, Myers 1981, Clancy and Price 1986, Jones et al 1987. Besides arthropod predation, there were two seasonally specific factors affecting egg and larval survival in later cohorts: heat stress at the egg stage and host deterioration at the larval stage.…”

Section: Variation In Cohort Lifetime Fitnessmentioning

confidence: 99%

Lifetime Fitness and Evolution of Reproductive Pattern in the Herbivorous Lady Beetle

Ohgushi¹

1991

Ecology

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The adaptive significance of the timing of oviposition in the thistle—feeding lady beetle Epilachna niponica was investigated at two localities (site A and site F) in the northwestern part of Shiga Prefecture, central Japan. I followed cohorts produced over a season and measured four components of lifetime fitness: egg survival, larval survival, female adult survival from emergence to the reproductive season in the following year, and lifetime fecundity. These data are based on mark—recapture data for >9000 adult beetles and detailed life tables over 5 yr. Large variation in lifetime fitness was evident among cohorts within a population, but the two local populations showed a clear difference in patterns of cohort fitness. At site A, cohorts, produced early in a season had higher lifetime fitness than later cohorts, whereas at site F, later cohorts (except for the last one) tended to have higher lifetime fitness. The major causes of these between—site differences wee seasonal variation in intensity of egg and larval mortalities due to arthropod predation and host plant deterioration. Field observations revealed a significant difference in oviposition phenology between the two sites: early reproduction at site A and delayed reproduction at site F. The relatively longer reproductive life—span of females was responsible for the prolonged reproduction at site F. Results of laboratory experiment that eliminated environmental variables agreed with the field observations, and suggested a genetic basis for the oviposition schedules. Correlation of reproductive pattern at each site with higher lifetime fitness of offspring suggests selection on the timing of oviposition to improve the lifetime reproductive success of females.

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Section: Variation In Cohort Lifetime Fitnessmentioning

confidence: 99%

Lifetime Fitness and Evolution of Reproductive Pattern in the Herbivorous Lady Beetle

Ohgushi¹

1991

Ecology

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“…Both types of responses are important to the population dynamics of the host, but the two should not be combined into one catch-all category of density dependence. The literature review contains many examples of studies that consider only spatial responses (e.g., Eikenbary and Fox 1968, Miinster-Swendsen 1980, Gargiullo and Berisford 1981, Lashomb and Steinhauer 1982 and others that consider only temporal responses (e.g., Harcourt 1971, Ryan 1983, Sunose 1985. The objective of the literature review was to identify biological features of density dependence; pooling two different forms of density dependence could obscure biological features of either form.…”

Section: Temporal Vs Spatialmentioning

confidence: 99%

“…Other confounding factors in the cited studies include host density being related to tree crown height (Eikenbary and Fox 1968, Miinster-Swendsen 1980, Lashomb and Steinhauer 1982, altitude (Randalll982), host species (Burleigh 1972), and seasonal development of the host plant (Vorley and Wratten 1985). When host density is correlated with such factors, any parasitism trends could be due either to host density or to the environmental factor.…”

Section: Confounding Factorsmentioning

confidence: 99%

Denstity Dependence in Insect Host‐Parasitoid Systems: A Comment

Brown¹

1989

Ecology

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“…The purpose of the paper was to show how my approach to population analysis (Berryman 1990, 1999, 2001) could be used to detect the causes of population cycles in his data on the spruce needle‐miner, Epinotia tedella (Cl.) (Münster‐Swendsen 1979, 1982, 1985). I should point out here that, at the time we first met, Mikael was not too impressed with my approach, being a proponent of the life table–key factor approach (Varley et al 1975).…”

mentioning

confidence: 99%

Detecting the causes of population cycles by analysis of R‐functions: the spruce needle‐miner, Epinotia tedella, and its parasitoids in Danish spruce plantations

Münster‐Swendsen¹,

Berryman

2005

Oikos

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Mü nster-Swendsen, M. and Berryman, A. 2005. Detecting the causes of population cycles by analysis of R-functions: the spruce needle-miner, Epinotia tedella , and its parasitoids in Danish spruce plantations. Á/ Oikos 108: 495 Á/502.Explaining the causes of regular multi annual oscillations (cycles) in animal populations has been a major problem for ecology, partly due to a lack of methodological rigor. In this paper we show how the analysis of R-functions, the functional relationship between the per capita rate of change of a species and components of its environment, can be used to detect the causes of population cycles. Analysis of the R-functions enables one to separate cycles due to negative feedback between species (endogenous causes) from those forced by one-way effects (exogenous causes). We illustrate the approach by reference to the spruce needle-miner inhabiting Danish spruce plantations, and conclude that population cycles in this insect are probably caused by interactions with two species of parasitic hymenoptera. ).Mikael Mü nster-Swendsen and I were working on this paper at the time of his untimely death in 2003. The purpose of the paper was to show how my approach to population analysis (Berryman 1990(Berryman , 1999(Berryman , 2001 could be used to detect the causes of population cycles in his data on the spruce needle-miner, Epinotia tedella (Cl.) (Mü nster-Swendsen 1979, 1982, 1985. I should point out here that, at the time we first met, Mikael was not too impressed with my approach, being a proponent of the life table Á/key factor approach (Varley et al. 1975). In time, however, he was to change his mind, and the reason for that is one of the lessons of this paper. I, on the other hand, was very impressed with his data. For 19 years he measured, with considerable precision (Mü nster-Swendsen 1985), the density of spruce needle-miners and their primary insect parasitoids emerging annually from the litter of a Danish spruce plantation. He then constructed detailed life tables, including all suspected mortality factors, for 9 of those years. Finally, he repeated the sampling for various shorter periods of time at 10 additional locations. Others may have longer time series, more detailed life tables, or more spatial replication, but none to my knowledge have more of all three. Mikael recently reviewed his analysis in chapter 2 of a book that I edited (Mü nster-Swendsen 2002), so there is no need for me to repeat it here. Suffice to say that the needle-miner population was found to exhibit spatially synchronous 6 Á/7 year cycles of abundance, and that the key factor affecting the population change was reduced fecundity. He also briefly mentions how my approach led to a different conclusion, that insect parasitoids were mainly responsible for the cyclic dynamics, and that the discovery of pseudoparasitism reconciled this conflict. However, he did not cover details of our analysis, referring instead to the present paper, which was

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The distribution in time and space of parasitism in Epinotia tedella (CI.) (Lepidoptera: Tortricidae)

Cited by 16 publications

References 10 publications

Lifetime Fitness and Evolution of Reproductive Pattern in the Herbivorous Lady Beetle

Lifetime Fitness and Evolution of Reproductive Pattern in the Herbivorous Lady Beetle

Denstity Dependence in Insect Host‐Parasitoid Systems: A Comment

Detecting the causes of population cycles by analysis of R‐functions: the spruce needle‐miner, Epinotia tedella, and its parasitoids in Danish spruce plantations

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