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Related Experiment Video

Updated: Feb 15, 2026

In Vivo Protocol of Controlled Subconcussive Head Impacts for the Validation of Field Study Data

In Vivo Protocol of Controlled Subconcussive Head Impacts for the Validation of Field Study Data

Published on: April 18, 2019

Using field data to quantify chemical impacts on wildlife population viability.

Jelle P Hilbers¹, Renske P J Hoondert¹, Aafke M Schipper¹

¹Department of Environmental Science, Institute for Wetland and Water Research, Faculty of Science, Radboud University Nijmegen, P.O. Box 9010, NL-6500 GL, Nijmegen, The Netherlands.

Ecological Applications : a Publication of the Ecological Society of America

|January 17, 2018

Summary

Environmental pollution impacts wildlife. This study developed a method using field data to quantify toxicant effects on population viability, revealing DDE

Keywords:

DDE Bald Eagle Osprey White-tailed Eagle birds of prey conservation biology critical patch size extinction risk pollutants population viability analysis toxicants wildlife

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Area of Science:

Ecotoxicology and Wildlife Population Dynamics
Environmental Chemistry and Toxicology
Conservation Biology

Background:

Environmental pollution is a major driver of biodiversity loss.
Quantifying chemical impacts on wildlife vital rates is challenging due to limited laboratory data.
Field-based methods are needed to assess toxicant effects on population persistence.

Purpose of the Study:

To develop and apply a novel method for quantifying toxicant exposure effects on wildlife population persistence using field monitoring data.
To establish field-based vital-rate-response functions for toxicants.
To assess the impact of DDE on the population extinction vulnerability of White-tailed Eagles, Bald Eagles, and Ospreys.

Main Methods:

Developed a method integrating field-based vital-rate-response functions with population viability modeling.
Utilized quantile regression to correct for confounding factors influencing vital rates.
Applied the method to quantify DDE impacts on three bird species using extinction vulnerability metrics.

Main Results:

DDE exposure significantly increased population extinction vulnerabilities across all three studied bird species.
Specific impacts included reduced population growth rates, increased critical patch sizes and minimum viable populations, and elevated probabilities of extirpation.
At historic DDE concentrations, population viability metrics indicated severe threats, particularly for Bald Eagles.

Conclusions:

The developed method provides species-specific, field-based toxicant response curves for assessing population extinction risks.
This approach enables the determination of critical toxicant exposure levels for conservation.
Findings support targeted conservation management strategies, including reducing chemical pollution and habitat restoration.