Phase Iii of Wright's Shifting Balance Process and the Variance Among Demes in Migration Rate

Wade, Michael J.

doi:10.1111/evo.12088

Cited by 8 publications

(8 citation statements)

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“…Let the number of migrants from the i th deme equal M i and define its mean as M and its variance V M . Wade (, p. 984, eq. [3b]) showed that the mean crowding of migrants around exporting demes, M *, equals,…”

Section: Wright's Interdemic Selection: Mean Crowding Of Migrants Fromentioning

confidence: 99%

“…Interdemic selection by the differential migration of individuals out from demes of high fitness and into demes of low fitness is one of the most controversial aspects of Wright's SBT. In a laboratory interdemic selection experiment (Wade & Goodnight, ), Wade () showed that the strength of interdemic selection in Wright's SBT depended upon the mean crowding of migrants across demes.…”

Section: Wright's Interdemic Selection: Mean Crowding Of Migrants Fromentioning

confidence: 99%

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50‐year anniversary of Lloyd's “mean crowding”: Ideas on patchy distributions

Wade

Fitzpatrick

Lively

2018

Journal of Animal Ecology

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This year marks the 50th anniversary of Monte B. Lloyd's "Mean Crowding" (1967) paper, in which he introduced a metric that accounts for an individual's experience of conspecific density. Mean crowding allows ecologists to measure the degree of spatial aggregation of individuals in a manner relevant to intraspecific competition for resources. We take the concept of mean crowding a step beyond its most common usage and that it has a mathematical relationship to many of the most important concepts in ecology and evolutionary biology. Mean crowding, a first-order approximation of the degree of nonrandomness in a distribution, can function as a powerful heuristic that can unify concepts across disciplines in a more general way that Lloyd originally envisioned.

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Section: Wright's Interdemic Selection: Mean Crowding Of Migrants Fromentioning

confidence: 99%

Section: Wright's Interdemic Selection: Mean Crowding Of Migrants Fromentioning

confidence: 99%

50‐year anniversary of Lloyd's “mean crowding”: Ideas on patchy distributions

Wade

Fitzpatrick

Lively

2018

Journal of Animal Ecology

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“…Recent experimental studies of migration during Phase III have shed some light on this question (Wade, 2013). When migration deviates from the island model of migration the arithmetic mean migration rate is not the appropriate measure of the genetic mixing that attends dispersion between populations (Sved and Latter, 1977).…”

Section: Nonrandom Phase III Migration and F Stmentioning

confidence: 99%

“…Where the island model assumes random migration, migration in natural populations tends to deviate from random. Wade (2013) used data from the experimental study of the SBT (Wade and Goodnight, 1991) to illustrate the degree to which Phase III migration increased the variance in migration rate and thereby lowered the effective migration rate. Specifically, where migrants disperse at random among metapopulation demes under the island model, in Wright's Phase III, migrants disperse nonrandomly such that the variation among demes in migrants received (and therefore gene flow) exceeds random.…”

Section: Nonrandom Phase III Migration and F Stmentioning

confidence: 99%

Shifting Balance Theory, Sewall Wright and

Wade

2016

Encyclopedia of Evolutionary Biology

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“…Wright's shifting balances process (WADE 2013;WRIGHT 1931;WRIGHT 1932;WRIGHT 1969;WRIGHT 1977) Population isolation has been hypothesized to increase inbreeding depression in the short-term, but given opportunities for subsequent purging, the long-term consequences of inbreeding become less predictable (IVES and WHITLOCK…”

Section: Discussionmentioning

confidence: 99%

Genetic analysis of metapopulation processes in Silene latifolia

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Molecular population genetics is one of the fastest growing areas of biological research, being of central importance to understanding human history, diversity, and the potential for personalized medicine. The field uses the fact that historical processes such as change in population size, rates and pathways of migration, and natural selection, all leave distinct footprints in an organism's DNA. Modern population genetics involves a rich arsenal of statistical tools that use DNA sequence data to make inferences about the evolutionary history of organisms and the genetic basis of their traits. My dissertation focuses on identifying the importance of selective and non-selective forces at different, hierarchically nested, biological levels in spatially structured (meta-)populations. In particular, my dissertation research This dissertation has derived a number of interesting inferences concerning the consequences of spatial population structure. Molecular marker specific evolutionary processes, and its concomitant variation, will determine both the type and accuracy of population genetic inferences available. The expectation of an inverse relationship between fitness and F will not always hold, and this discrepancy might be attributed to processes associated with population structure.Historical contingency will play a dominant role in determining the role of selective processes determining the quantity and distribution of neutral molecular variation, as well as asynchrony in the co-evolutionary process in spatially structured hostpathogen systems. Mean levels of cyto-nuclear disequilibrium are generally quite stable over up to seven generations of the focal plant species, though specific associations are quite labile and are highly affected by drift-like processes. And finally, intra-demic selection can be active in "everyday", natural metapopulations, through hard selection acting on differential colonization, where different levels of selection are not necessarily in opposition to one another. Taken together, my dissertation aims to provide a unique window into the current and historical factors distributing population genetic diversity, but also how this structure will affect the evolution of the system itself. Continued long-term monitoring, iterative sampling, application of newer sequencing technologies, and the development of newer 4 analytical methodologies will continue to show interesting biological dynamics taking place as the result of spatial population structure. 5 ACKNOWLEGMENTSThere are many people that must be thanked for the help and guidance they have provided, allowing me to finish this dissertation. Though the exact origin of the adage "It takes a village" is unknown, I find it an apt description nonetheless.

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Phase Iii of Wright's Shifting Balance Process and the Variance Among Demes in Migration Rate

Cited by 8 publications

References 39 publications

50‐year anniversary of Lloyd's “mean crowding”: Ideas on patchy distributions

50‐year anniversary of Lloyd's “mean crowding”: Ideas on patchy distributions

Shifting Balance Theory, Sewall Wright and

Genetic analysis of metapopulation processes in Silene latifolia

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