Open capture-recapture models with heterogeneity: II. Jolly-Seber model

Area of Science:

• Ecology
• Population Dynamics
• Statistical Modeling

Background:

• Capture-recapture methods are crucial for estimating population size.
• Unaccounted-for variation in capture probability (heterogeneity) causes negative bias in abundance estimates.
• Existing models often fail to address heterogeneity in both capture and survival probabilities.

Purpose of the Study:

• To develop and present open population capture-recapture models incorporating finite mixtures.
• To model heterogeneity in both capture and survival probabilities.
• To provide realistic abundance estimates and assess survival overestimation.

Main Methods:

• Utilized finite mixture models to represent heterogeneity in capture and survival probabilities.
• Employed likelihood-based methods for model comparison and parameter estimation.
• Conducted simulations to evaluate model performance and estimation accuracy.

Main Results:

• Developed novel open population models that effectively handle capture and survival heterogeneity.
• Demonstrated that finite mixture models yield more accurate abundance estimates compared to traditional methods.
• Quantified the overestimation of survival when heterogeneity is ignored and survival is conditioned on first capture.

Conclusions:

• Finite mixture models offer a robust framework for addressing heterogeneity in capture-recapture studies.
• Accurate abundance and survival estimates require explicit modeling of individual variation.
• These methods are essential for reliable population parameter estimation in ecological research.