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Related Experiment Video

Updated: Jun 28, 2026

Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis

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Published on: August 12, 2019

Characterizing source-sink dynamics with genetic parentage assignments.

M Zachariah Peery¹, Steven R Beissinger, Roger F House

¹Department of Environmental Science, Policy and Management, 137 Mulfiord Hall, University of California, Berkeley, California 94720-3114, USA. zpeery@nature.berkeley.edu

|October 31, 2008

Summary

This summary is machine-generated.

Estimating species migration rates is challenging. This study uses genetic parentage to show a threatened seabird population receives 2-6% annual immigration, confirming source-sink dynamics.

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Area of Science:

Ecology
Population Genetics
Conservation Biology

Background:

Source-sink dynamics are crucial for population structure but difficult to quantify due to migration estimation challenges.
Traditional demographic and genetic methods struggle with accurate migration rate estimation, especially in high-gene-flow species.

Purpose of the Study:

To develop and apply a novel method using genetic parentage assignments to estimate immigration rates into sink populations.
To test the efficacy of this method, particularly for species with high gene flow and on ecological timescales.

Main Methods:

Employed individual-based demographic simulations to model parent-offspring dyad distributions under sink and closed-population scenarios.
Utilized multilocus genetic profiles for parentage assignment to identify actual parent-offspring dyads in a wild population.
Compared observed dyads to simulated expectations to estimate immigration rates.

Main Results:

The genetic parentage approach provides higher statistical power for detecting immigration when rates are high.
Demonstrated that a threatened population of Marbled Murrelets experiences low annual immigration, estimated at approximately 2-6%.

Conclusions:

Genetic parentage assignment combined with demographic simulations offers a robust method for estimating immigration rates, even in high-gene-flow populations.
The findings confirm the role of immigration in supplementing a threatened Marbled Murrelet population, highlighting its importance for conservation.