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Updated: Jun 12, 2026

Nest Building Behavior as an Early Indicator of Behavioral Deficits in Mice

Nest Building Behavior as an Early Indicator of Behavioral Deficits in Mice

Published on: October 19, 2019

Using simulation models to evaluate ape nest survey techniques.

Ryan H Boyko¹, Andrew J Marshall

¹Department of Anthropology and Graduate Group in Ecology, University of California Davis, Davis, California, USA. rboyko@ucdavis.edu

|May 28, 2010

Summary

This summary is machine-generated.

Great ape population estimates from nest counts are often unreliable. Mathematical simulations show both marked recount and matrix methods can overestimate populations, with accuracy depending on survey effort and nest decay rates.

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Last Updated: Jun 12, 2026

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Area of Science:

Ecology
Conservation Biology
Population Dynamics

Background:

Nest count surveys are crucial for estimating great ape population densities.
Assessing the accuracy and precision of these population estimates remains challenging.

Purpose of the Study:

To compare the accuracy of two common nest count methods: the marked recount and matrix methods.
To evaluate the impact of observer reliability and surveying effort on population estimates.
To determine optimal surveying effort for reliable great ape population size estimation.

Main Methods:

Mathematical simulations were used to model orangutan nest building behavior.
Two methods were compared: the marked recount method and the matrix method.
The study analyzed the effects of observer reliability, surveying effort, and nest decay rates on population estimates.

Main Results:

Both marked recount and matrix methods can produce significant population overestimates, especially with low surveying effort or missed nests.
An accurate population estimate (within 33% of true size 50% of time) required surveying 0.26% of the study area for both methods.
Using published nest decay rates from other sites led to highly variable population estimates.
The marked recount method showed higher efficacy in detecting population declines.

Conclusions:

Neither nest surveying method guarantees highly reliable population size estimates with typical surveying efforts.
Conservation managers should carefully weigh the cost-benefit of nest count surveys and limit effort to approximately 0.26% of the study area.
Accurate population estimation necessitates site- and time-specific nest decay rates or the marked recount method.
Marked recount surveys with adequate effort show potential for detecting population declines.