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Breaking down population density into different components to better understand its spatial variation.

Mickaël Jacquier1,2, Jean-Michel Vandel3, François Léger4

  • 1CNRS, UMR5558 LBBE, Univ Lyon, Université Claude Bernard Lyon 1, 69100, Villeurbanne, France. mick.jacquier@gmail.com.

BMC Ecology and Evolution
|May 12, 2021
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Summary
This summary is machine-generated.

Understanding European badger population density requires analyzing group size and sett density. Landscape fragmentation impacts badger density, highlighting the need to study density components separately for effective conservation.

Keywords:
Camera trapDistance samplingGroup sizeLarge-scaleMeles melesMolecular ecologyMustelidaePopulation density

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Area of Science:

  • Ecology
  • Wildlife Conservation
  • Population Dynamics

Background:

  • Population density is crucial for ecological resilience and conservation efforts.
  • Social species' density comprises group number and size, influenced by environmental factors.
  • Spatial variations in social species' density components are poorly understood.

Purpose of the Study:

  • To investigate spatial variations in European badger (Meles meles) population densities across 13 French sites.
  • To determine if sett density, group size, or occupied sett proportion best explains badger density variations.
  • To assess the influence of habitat fragmentation, urbanization, and resource availability on badger density and its components.

Main Methods:

  • A standardized approach combining distance sampling for group density estimation.
  • Camera and hair trapping with genetic analysis to determine mean social group size.
  • Assessment of habitat characteristics including fragmentation, urbanization, and resource availability.

Main Results:

  • Average adult badger density was 3.8 individuals/km², positively correlated with sett cluster density.
  • Badger density showed weaker relationships with social group size or proportion of occupied setts.
  • Landscape fragmentation negatively impacted adult badger density; different components responded variably to environmental factors.

Conclusions:

  • Population density estimates for group-living species should be broken down into components.
  • Understanding variations in density components is essential for accurate temporal and spatial population density analysis.
  • Different ecological factors influence distinct components of population density, necessitating a nuanced approach to wildlife management.