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Speciation Rates

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Related Experiment Video

Updated: Apr 11, 2026

Resurrection of Dormant Daphnia magna: Protocol and Applications

Resurrection of Dormant Daphnia magna: Protocol and Applications

Published on: January 19, 2018

Divergence in sink contributions to population persistence.

Julie A Heinrichs¹, Joshua J Lawler¹, Nathan H Schumaker²

¹School of Environmental and Forest Sciences, University of Washington, P.O. Box 352100, Seattle, WA, 98195-2100, U.S.A.

Conservation Biology : the Journal of the Society for Conservation Biology

|June 3, 2015

Summary

Population sinks can harm or help endangered species conservation. Their impact depends on species, habitat quality, and management, requiring dynamic reassessment for effective conservation strategies.

Keywords:

Dipodomys ordii Strix occidentalis caurina Vireo atricapilla contribuciones de vertedero dinámicas de fuente-vertedero ecological traps modelo espacialmente explícito basado en individuos persistencia poblacional population persistence sink contributions source-sink dynamics spatially explicit individual-based model trampas ecológicas

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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Area of Science:

Ecology
Conservation Biology
Population Dynamics

Background:

Population sinks, areas with higher mortality than birth rates, pose conservation challenges.
Sinks can also enhance regional population viability by improving connectivity and facilitating recolonization.
Understanding the dual role of sinks is crucial for managing declining populations.

Purpose of the Study:

To assess the contribution of sink habitats to the regional persistence of declining populations.
To quantify population abundance and persistence with and without long-term sinks using empirical data.
To evaluate the context-dependent effects of sinks on endangered species.

Main Methods:

Simulated source-sink dynamics for three endangered species: Black-capped Vireos, Ord's kangaroo rats, and Northern Spotted Owls.
Utilized spatially explicit individual-based models parameterized with empirical data.
Quantified population abundance and persistence under varying sink conditions.

Main Results:

Sink contributions varied widely, being detrimental in some declining populations (e.g., Ord's kangaroo rats) and benign in others (e.g., Black-capped Vireos with controlled parasitism).
Sinks, including ecological traps, played a crucial role in delaying declines when source populations were limited.
Sinks supporting large, variable populations faced higher extinction risks (e.g., Northern Spotted Owls), and new sinks emerged dynamically.

Conclusions:

Sink habitats can be detrimental or beneficial depending on the species, population status, and environmental context.
Management strategies assuming sinks are uniformly harmful or helpful may jeopardize conservation efforts.
Frequent re-assessment of source-sink dynamics is essential for effective conservation planning.